Asp contents removeall


Содержание

LINQ: RemoveAll и удалить элементы

Какой самый простой способ удалить элементы, которые соответствуют определенному условию из списка, а затем получить эти элементы.

Я могу думать несколькими способами, я не знаю, какой из них лучше:

Является ли это одним из лучших способов? Если да, то какой? Если это не так, как мне это сделать?

Я бы выбрал первый вариант для удобства чтения с запиской о том, что вы должны перенести список в первую очередь или потеряете те самые элементы, которые вы пытаетесь выбрать на следующей строке:

Второй пример — O (n ^ 2) без всякой причины, а последнее отлично, но менее читаемо.

Изменить: теперь, когда я перечитываю ваш последний пример, обратите внимание, что, поскольку он написан прямо сейчас, он будет вынимать каждый другой элемент. Вам не нужно проверять состояние, и строка удаления должна быть list.RemoveAt(i—); , потому что после удаления элемент i+1 th становится элементом i th, а когда вы увеличиваете i , вы пропускаете его.

Мне нравится использовать функциональный программный подход (только создавать новые вещи, не изменять существующие вещи). Одним из преимуществ ToLookup является то, что вы можете обрабатывать более двухстороннее разделение элементов.

Или, если вам нужно изменить исходный экземпляр.

.RemoveAll()

какие аргументы должны быть у метода .RemoveAll() ?

24.08.2010, 17:28

JPanel.removeAll зависает
на панель добавлено 10000 кнопок (ну, вот так вот надо :)), в процессе работы программы вызываю.

java.awt.Container.removeAll()
Почему после метода removeAll() не добавляются компоненты. JFrame a = new JFrame();.

Составить предикат для RemoveAll
Здравствуйте! Будьте любезны помочь мне написать предикат для функции выполняемой по клику мыши: .

Asp contents removeall

The Contents.Remove method for ASP deletes an item from the Application.Contents collection.

A string or an integer >id is a string, the method searches the contents collection for an item with that name and removes it. If id is an integer, the method counts that number of items from the start of the collection and removes the corresponding item.

When id is an integer, the index numbers of all items in the collection are updated. It is recommended that you always identify an item in a collection by its name.

This method has no return values.

Although ASP collections are similar to the Visual Basic Collection object, there are some differences. ASP collections support the Count property and the Item, Remove, and RemoveAll methods. They do not support the Add method.

The following example adds three items to the Application.Contents collection and removes two. At the end of the example, Application(str3) is the first item instead of the third.

Client: Requires Windows XP Professional, Windows 2000 Professional, or Windows NT Workstation 4.0.

Server: Requires Windows Server 2003, Windows 2000 Server, or Windows NT Server 4.0.

Как использовать.RemoveAll здесь?

Простой вопрос здесь, но это убивает меня, пытаясь заставить это работать.

У меня есть класс, называемый Taxonomy . Существует свойство, называемое WebName , я получаю список классов Taxonomy и хотел бы использовать .RemoveAll для удаления любой из таксономии в списке с помощью WebName.ToLower() равным либо «n/a» либо «other» . WebName имеет строку типа.

Это то, что я пробовал до сих пор:

Как я могу изменить список theNeighborhoods чтобы выбрать только те значения, которые не имеют «n/a» или «other» в свойстве WebName для каждой Taxonomy ?

Вышеприведенный код дает мне ошибку, что-то вроде int не имеет расширения ToList Как это сделать с .RemoveAll ?

3 ответа

2 Решение Becuzz [2014-07-31 23:41:00]

Вы могли бы сделать одну из двух вещей. Сначала вы можете использовать где-нибудь из LINQ:

В качестве альтернативы вы можете вызвать RemoveAll после получения списка, например:

RemoveAll возвращает int, который показывает, сколько элементов было удалено. Вот почему вы получили ошибку, которую вы сделали. Я предлагаю просмотреть документацию по RemoveAll.

Ваш код не работает, потому что RemoveAll возвращает int не List или IEnumerable .

Также стоит отметить, что вы дважды вызываете ToList , ToList не является бесплатным. Это связано с созданием нового массива и копированием элементов. Поэтому избегайте избыточного использования ToList .

0 Max [2014-07-31 23:40:00]

Вы не можете написать ToList(), потому что RemoveAll возвращает количество удаленных элементов (int).

Asp contents removeall

I have a word template with content control in it. I need to write a program to generate report out of it. The report should delete the content control and place a given text.

I am trying to acheive this using Open XML. I am looking for some help on this.

Answers

I recommond you a nice tool which you can look into the structure of the word document and get the reflection code:

I found if the content control is in the table, it is the SdtCell element, then we need to create the TableCell after removing the SdtCell, below is the code which I have coded for you to reference:

Hope this can help you and just feel free to follow up after you have tried. Wish you a nice day.

Bruce Song [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

  • Marked as answer by Bruce Song Tuesday, August 9, 2011 6:03 PM

All replies


You can iterator all the content controls and then replace each one with the text. Here is the code snippet which I have tested for you to reference:

Hope this can help you and just feel free to follow up after you have tried. Wish you a nice day.

Bruce Song [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Thanks for the code snippet. This didnt work for my scenario. I have a table in Word template. Each cell of the table has a content control. I want to replace all of the with some text. Since the code creates a new paragraph the paragraph gets appended after the table and hence didnt satisfy my need. Can you help me in this case?

I recommond you a nice tool which you can look into the structure of the word document and get the reflection code:

I found if the content control is in the table, it is the SdtCell element, then we need to create the TableCell after removing the SdtCell, below is the code which I have coded for you to reference:

Hope this can help you and just feel free to follow up after you have tried. Wish you a nice day.

Bruce Song [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

  • Marked as answer by Bruce Song Tuesday, August 9, 2011 6:03 PM

Why not replace the text within the table cell rather than the whole cell?

TableCell tc = sdtCCell.Elements ().First();
if (tc != null)
<
// simple text, assume 1 paragraph to handle
para = tc.Elements

().First();
if (para != null)
<
// simple text, assume 1 run to handle
Run r = para.Elements ().First();
if (r != null)
<
Text t = r.Elements

What you are trying to do seems very simple but it is not. I know this beacause we created Docentric toolkit (you might want to check it out) which does exactly what you try to do (and much more). The problem is that placeholders (content controls) can sometimes be directly in a paragraph and sometimes are in table cells (like in your case). When you place a content control (CC) into a cell there are several possible cases/outcomes:

— CC is wrapped by a cell, CC wraps the paragraph

— CC is wrapping the cell

— CC is wrapped by the paragraph in the cell (this occurs when there is some other content besides the CC)

— CC is wrapping table row (can occure when table only has 1 column — very rare)

This part of our product was one of the most tedious and we needed a lot of time and testing to cover all the cases. As a result the method that handles this is veary complex. Sometimes you need to create a new paragraph, sometimes not. Sometimes you need to create several new paragraphs if you are replacing CC with a multiline text. You should also be careful how to delete the CC after the text has been inserted. The snippet that Bruce posted works only for the first case which is the most simple, but not for others. O nce again, take a look at our product. it might be a better choice over creating your custom solution.

RemoveAll()

ICollection interface has List type most of time, so this Extension allows to call RemoveAll() method with the same signature like on List

Source

Example

Submitted on: 30 aug 2020

Language: C#

Type: ICollection

Views: 3200

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LINQ: RemoveAll и удалить элементы

Какой самый простой способ удалить элементы, которые соответствуют определенному условию из списка, а затем получить эти элементы.

Я могу думать несколькими способами, я не знаю, какой из них лучше:

Является ли это одним из лучших способов? Если да, то какой? Если это не так, как мне это сделать?

Я бы выбрал первый вариант для удобства чтения с запиской о том, что вы должны перенести список в первую очередь или потеряете те самые элементы, которые вы пытаетесь выбрать на следующей строке:

Второй пример — O (n ^ 2) без всякой причины, а последнее отлично, но менее читаемо.

Изменить: теперь, когда я перечитываю ваш последний пример, обратите внимание, что, поскольку он написан прямо сейчас, он будет вынимать каждый другой элемент. Вам не нужно проверять состояние, и строка удаления должна быть list.RemoveAt(i—); , потому что после удаления элемент i+1 th становится элементом i th, а когда вы увеличиваете i , вы пропускаете его.

Мне нравится использовать функциональный программный подход (только создавать новые вещи, не изменять существующие вещи). Одним из преимуществ ToLookup является то, что вы можете обрабатывать более двухстороннее разделение элементов.

Или, если вам нужно изменить исходный экземпляр.

Asp contents removeall

I have a word template with content control in it. I need to write a program to generate report out of it. The report should delete the content control and place a given text.

I am trying to acheive this using Open XML. I am looking for some help on this.

Answers

I recommond you a nice tool which you can look into the structure of the word document and get the reflection code:

I found if the content control is in the table, it is the SdtCell element, then we need to create the TableCell after removing the SdtCell, below is the code which I have coded for you to reference:

Hope this can help you and just feel free to follow up after you have tried. Wish you a nice day.

Bruce Song [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

  • Marked as answer by Bruce Song Tuesday, August 9, 2011 6:03 PM


All replies

You can iterator all the content controls and then replace each one with the text. Here is the code snippet which I have tested for you to reference:

Hope this can help you and just feel free to follow up after you have tried. Wish you a nice day.

Bruce Song [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Thanks for the code snippet. This didnt work for my scenario. I have a table in Word template. Each cell of the table has a content control. I want to replace all of the with some text. Since the code creates a new paragraph the paragraph gets appended after the table and hence didnt satisfy my need. Can you help me in this case?

I recommond you a nice tool which you can look into the structure of the word document and get the reflection code:

I found if the content control is in the table, it is the SdtCell element, then we need to create the TableCell after removing the SdtCell, below is the code which I have coded for you to reference:

Hope this can help you and just feel free to follow up after you have tried. Wish you a nice day.

Bruce Song [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

  • Marked as answer by Bruce Song Tuesday, August 9, 2011 6:03 PM

Why not replace the text within the table cell rather than the whole cell?

TableCell tc = sdtCCell.Elements ().First();
if (tc != null)
<
// simple text, assume 1 paragraph to handle
para = tc.Elements

().First();
if (para != null)
<
// simple text, assume 1 run to handle
Run r = para.Elements ().First();
if (r != null)
<
Text t = r.Elements

What you are trying to do seems very simple but it is not. I know this beacause we created Docentric toolkit (you might want to check it out) which does exactly what you try to do (and much more). The problem is that placeholders (content controls) can sometimes be directly in a paragraph and sometimes are in table cells (like in your case). When you place a content control (CC) into a cell there are several possible cases/outcomes:

— CC is wrapped by a cell, CC wraps the paragraph

— CC is wrapping the cell

— CC is wrapped by the paragraph in the cell (this occurs when there is some other content besides the CC)

— CC is wrapping table row (can occure when table only has 1 column — very rare)

This part of our product was one of the most tedious and we needed a lot of time and testing to cover all the cases. As a result the method that handles this is veary complex. Sometimes you need to create a new paragraph, sometimes not. Sometimes you need to create several new paragraphs if you are replacing CC with a multiline text. You should also be careful how to delete the CC after the text has been inserted. The snippet that Bruce posted works only for the first case which is the most simple, but not for others. O nce again, take a look at our product. it might be a better choice over creating your custom solution.

Wideskills

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03 — Traditional ASP Concepts

3.1 Introduction of ASP

Active Server Pages is the abbreviation of ASP. It is a Microsoft technology that enables the development of dynamic web pages. ASP files contain HTML, text, XML and scripts used for developing web pages. These tags provide dynamic content for web development. An ASP file has .asp file extension. ASP programs runs inside Internet Information Services (IIS).

Active Server Pages enables server side scripting for IIS. It provides native support for both VBScript and Jscript. Server executes the scripts present in the ASP files.

Advantages of using ASP

  • User can dynamically edit, change, or update the content of a web page
  • No client s >3.2 Working of ASP

The web architecture of ASP is represented. The client/user send the HTTP request to the IIS for processing the ASP page. IIS identifies the scripting language used for developing the ASP page. Depending on the scripting language, the file is sent to the ActiveX scripting engine. The engine performs the operations and the result is sent back to the IIS. The interchange server checks for the data objects present in the page.

The objects are transferred to the ActiveX Data objects. Active objects are sent to the database for performing the database operations. The database sends the result to the data objects. IIS receives the expected result through database. IIS send the result back to the client/user through the HTTP response object. Thus, this is the execution cycle of the ASP

3.3 ASP Objects

There are several ASP objects used for writing ASP code. Each object has its unique functionality. The list of ASP objects is mentioned below:

  • ASP Response object
  • ASP Request object
  • ASP application object
  • ASP session object
  • ASP error object
  • ASP FileSystem object
  • ASP TextStream object
  • ASP Drive object
  • ASP File object
  • ASP Folder object
  • ASP Dictionary

1) ASP Response object:

The ASP Response object is used to send the server output to the user. The properties and methods of the ASP Response object with their syntax are mentioned below:

Properties of ASP Response object

Property

Description

Syntax

It is used to specify that the page can be buffered

response.Buffer[=flag], where flag is Boolean value.

It is used to cache the output generated by ASP page through proxy server

where control header value can be private or public

It appends the name of character set to the content header in Response object

response.Charset(charsetname), where charset is string that specifies a character set on the page


It sets the HTTP content type for the Response object

response.ContentType[=contenttype], where contentype is string variable

It defines the duration of page caching before the browser expires

response.Expires[=number], where number is minutes before the page expires

It sets the date and time for a cached page to expire on the browser

where date and time are values when the page will expire

It indicates whether the client is disconnected from the browser

It specifies the value of the status line returned by server

where status description is a three digit code

Property of ASP Request object

Property

Description

Syntax

It returns the total number of bytes the client sent in the request body

Method of ASP Request object

Method

Description

Syntax

It is used to retrieve the data sent to the server

Request.BinaryRead(count), where count is the number of bytes to be read from client

Collections of ASP Request object

Collection

Description

Syntax

It contains the field values stored in the client certificate

It is used to get or set cookie values

It is used to retrieve the values of form elements

It contains all the variable in HTTP query string

It contains all the server variables

3) ASP Application object:

The application consists of many ASP files. The purpose of the Application object is to combine these files together. The Application object stores variables from the ASP pages. Only one application object is used among all the users. The information stored in the Application object can be accesses from any page. The Application objects collections, events and methods are mentioned below:

Collections of ASP Application object:

Collection

Description

Syntax

It contains all the items appended to the application through script command

where key is the name of the item to retrieve

It contains all the objects appended to the application with HTML tag

where key is the name of the item to retrieve

Methods of ASP Application object

Method

Description

Syntax

It deletes an item from the Content collection

(name|index), conatins the value to retrieved

It removes all items from the Content collection

It prevents the user from modifying the variable

It helps user to modify the variable

Events of ASP Application object:-

Event

Description


Syntax

It occurs before the first session is created

It occurs when the application ends

4) ASP Session object:

The session object is used to store information about the user session. A cookie is created for every user. The cookie contains all the information required for user identification. The interface providing this feature is session object.
The collections, properties, methods and events of the ASP Session object are mentioned below:

Collections of ASP Session object

Collection

Description

Syntax

It contains items appended to the session through command object

Where Key is the name of the item to be retrieved

It contains all the objects appended to the session through HTML tag

Where Key is the name of the item to be retrieved

Properties of ASP Session object

Property

Description

Syntax

It specifies the character set used to display dynamic content

Where CodePage is for the system running the script

It sets or returns an integer specifying location or region

LCID is a locale identifier

It returns a unique id for each user

It sets or returns the timeout period for the session object

Methods of ASP Session object

Method

Description

Syntax

It destroys the user session

It deleted the item from the Contents collection

It deleted all the items from the Contents collection

Events of ASP Session object

Event

Description

Syntax

It occurs when the server creates a session

It occurs when the session ends

5) ASP Server object

The ASP Server object is used to access the properties and methods on the server. The properties and methods of the ASP Server object are mentioned below

Property of ASP Server object

Property

Description

Syntax

It sets or returns the maximum number of seconds a script can execute

Methods of ASP Server object

Method

Description

Syntax

It creates an instance of an object

where progID is the object type to be created

It executes the ASP file from another ASP file

Server.Execute(path), where path is the location of the ASP file


It returns an ASPError object for the error condition

It applies HTML encoding to a string

where string is to be encoded

It maps a specified path to the physical path

where path is relative or virtual

It sends information from ASP file to another file

where path is the location of the ASP file

It applies the URL encoding rules to the specified string

Where the string is to encoded

6) ASP Error object

The ASP Error object is used to display detail information of error occurring in the ASP page. The properties of the ASP Error object is mentioned below

Properties of ASP Error object

Property

Description

Syntax

It returns an error code generated by IIS

It returns a detail description of the error

It returns the source of the error

It returns the column position within the ASP file

It returns a short description of the error

It returns the name of the ASP file generating the error

It returns the number of lines that generated the error

It returns the standard COM error code for the error

It returns the actual source code of the line

7) ASP FileSystem object

The ASP FileSystem object is used to access the file system on a server. These objects can manipulate files, folders, and directory paths. File system information can be retrieved using the FileSystem object. The properties and methods of the FileSystem object are mentioned below

Property of ASP FileSystem object

Property

Description

Syntax

It returns a collection of drive objects on the system

Methods of ASP FileSystem object

Method

Description

Syntax

It appends a name to an existing path

It copies one or more files from one location to another

It copies one or more folder in the system

It creates a new folder

It creates a new text file in the current folder

It deleted the file specified in the parameters list

It deleted the folders specified in the parameter list

It checks for the existence of the specific drive

It checks for the existence of the specific file

It checks for the existence of the specific folder

It returns the complete path from to root to the destination

It returns the base name of the file or folder

It returns the drive object for the specific parameter

It returns the drive name of the specific path

It returns the file extension name for the component

It returns the file object for the specified path


It returns the file or folder for the last component in the specified path

It returns the folder object for the specific path

It returns the name of the parent folder in the specific path

It returns the path of Windows special folders

It returns a randomly generated temporary file

It moves files to different location

It moves folders to different location

It opens the specific file and returns the TextStream object

(fname, mode, create, format)

8) ASP TextStream object

The ASP TextStream object is used for accessing the contents of the text file. The CreateTextFile or OpenTextFile methods are used to create the instance of the TextStream object. The properties and methods of the ASP TextSteam object are as mentioned below

Properties of ASP TextStream object

Property

Description

Syntax

It returns Boolean value depending on the file pointer position

It returns true if the file pointer is at the end of the file

It returns the column number of the current character position

It returns the current line number in the file

Methods of ASP TextStream object

Method

Description

Syntax

It closes the TextStream file

It reads the specific number of characters from the file

It reads the complete TextStream file

It reads one line from the TextStream file

It skips the number of characters specified while reading the file

It skips a line while reading a TextStream file

It writes the specific text to the TextStream file

It writes the specific text and an new line character

It writes the specific number of new line character to the file

9) ASP Drive object

The ASP Drive object is used to return information about network share or local drive. The information regarding driver type, free space, serial number, volume name is specified in the Drive object.

Properties of ASP Drive object

Property

Description

Syntax

It returns the space available for the user

It returns the letter indicating the local drive

It returns the value indicating the drive type

It returns the file system in use for the specific drive

It returns the amount of free space for the user

It returns true if the specified drive is ready

It returns the path for a specific drive, file or folder

It returns the root folder of the specific drive

It returns the serial number of the specific drive

It returns the network share name for the specific drive

It returns the total size, in bytes for specific drive

It returns the volume name of the specific drive

10) ASP File object


The ASP File object is used to return information for the specified file. User must create an instance of the File object through FileSystemObject. Next, instantiate the File object through the GetFile method. The properties and methods of the ASP File object are mentioned below

Properties of ASP File object

Property

Description

Syntax

It sets or returns the attributes of a specific file

It returns the date and time of the file creation

It returns the date and time when the file was last accessed

It returns the date and time when the file was last modified

It returns the drive letter of the drive where the file is located

It is used to set or return the name of the specific file

It is used to return the folder object for the parent of the file

It returns the path for the specified file

It is used for returning short name of the specific file

It is used for returning short path of the specific file

It returns the size of the file in bytes

It returns the type of the specific file

Methods of ASP File object

Method

Description

Syntax

It copies the file from the defined location

It deleted the specified file

Moves the specified file in the system

It opens a specific file and returns the TextStream object

11) ASP Folder object

The ASP Folder object is used to return information about the folder specified by the user. User must create an instance of the Folder object through FileSystemObject. Next, instantiate the Folder object through the GetFolder method. The collections, properties and methods of the ASP Folder object are mentioned below

Collections of ASP Folder object

Collection

Description

Syntax

It returns the collection of all files in the specific folder

It returns the collection of all subfolders in the specific folder

Properties of ASP Folder object

Property

Description

Syntax

It sets or returns the value for a specific folder

It returns the date and time of the folder creation

It returns the date and time when the folder was last accessed

It returns the date and time when the folder was last modified

It returns the drive letter of the drive where the folder is located

It returns true if the specified folder is root

It is used to set or return the name of the specific folder

It is used to return the folder object for the parent of the folder

It returns the path for the specified folder

It is used for returning short name of the specific folder

It returns the size of the folder in bytes

It returns the type of the specific folder

It is used for returning short path of the specific folder

Methods of ASP Folder object


Method

Description

Syntax

It copies the folder from the defined location

It deleted the specified folder

Moves the specified folder in the system

It creates a new text file in the current folder and returns a TextStream object

12) ASP Dictionary object

The Dictionary object is used for storing information in name/value pair. The items in the Dictionary objects are identified through keys. Items automatically shift up when the item is deleted from the Dictionary. Dictionary has built in functions that provide easy processing. The properties and methods of the ASP Dictionary object are as mentioned below:

Properties of ASP Dictionary object

Property

Description

Syntax

It sets or returns the comparison mode for comparing keys in Dictionary

It returns the number of key/item pair in the object

It sets or returns the value of an item

Used to set the new value for an existing key value

Methods of ASP Dictionary object

Method

Description

Syntax

It adds a new key/item pair

to a Dictionary object

It returns a Boolean value if the key exists

It returns an array of all items in the Dictionary object

It returns an array of all keys in the Dictionary object

It removes one specific item from the key/item pair

It removes all key/item pairs in the Dictionary object

3.4 Sample Program of ASP

3.4.1 Basic syntax of ASP

The ASP code is written by using HTML tags. It contains server scripts inside delimiters. The delimiters are denoted as . The scripts are executed on the server and contains expressions, statements, procedures, and operators for the respective scripting language.

The response.write command is used to write output to the browser. The example of the response.write command is mentioned below:

3.4.2 ASP Procedures

The ASP Procedures are created using the sub keyword. The end of the procedure is defined by end sub keyword. The example of ASP Procedure is mentioned below:

3.4.3 ASP Functions

User should insert line before the tag. The function keyword is used for creating ASP functions. The example of ASP function is mentioned below:

3.4.4 ASP Forms and User Input

Information from the ASP forms can be retrieved using Request objects. The Request.QueryString and Request.Form commands are used to retrieve the form values.

Request.QueryString: The command is used to collect values in a form with the ‘get’ method. Information sent from a form through the get method is visible to all the users. The example of HTML form is shown below:

The script in the Academic.asp is mentioned below:

The output will be displayed as :

Report Page MCA A

Request.Form: The command is used to collect values using post method from a form. Information sent through the post method is invisible to other users. Unlimited data can be sent through the method. The script in the Academic script is mentioned below

3.3.5 ASP Cookies

A cookie is a file embedded by the server on the users system. It is used to identify the user. For every web page request, a cookie is sent to the server. Using ASP, user can create and retrieve cookie values.

The Response.Cookies command is used to create cookies. The example of cookie creation is mentioned below:

To retrieve the cookie values use the Request.Cookies command. The example to retrieve cookie values is shown below:

When the cookie has multiple values , the cookie has Keys. The example of cookie collection as data is mentioned below:

Динамические формы в ASP.NET MVC

Часто у пользователя требуется узнать информацию о нескольких дополнительных объектах, число которых заранее не известно. Для это используют динамические формы, поля которых создаются javascript кодом на клиентской машине. В asp.net mvc работая в связке Controller-View мы работаем с типизированными объектами. Преобразованием значений из requestа пришедшего с клиента в типизированный объект занимается класс ModelBinder. Для простых объектов это достаточно тривиальная задача. Но как правильно обработать динамические данные, имена параметров которые заранее неизвестны. Решением этой задачи и посвящен этот пост.

В asp.net MVC контроллер (Controller) уведомляет представление (View) о изменениях модели передавая ему типизированный объект данных:

Передача данных во View:

В представлении GiftView.aspx мы отображаем значения этого объекта:

Так же в asp.net MVC существует раздельное использование GET и POST запроса с помощью аттрибута AcceptVerbs перед методом обработки данных контроллером. Данные, которые поступают в POST запросе обрабатываются ModelBinder-ом и инициализируют объект, который поступает параметром в метод для обработки данных:

Где View для этого метода контроллера:

Это очень удобно в использовании, но есть одна проблема когда мы сталкиваемся с заполнением динамических форм. Для добавления дополнительных полей используется javascript, который их сгенерирует. Но как их потом правильно передать на сервер, чтобы получить типизированный объект? Есть несколько решений этой ситуации. Но для начала расширим наш объект, с которым мы работаем в форме:

Первый метод:
В методе-обработчике POST-запроса не будем принимать никаких параметров, а вручную обработаем свойство Request.Params (NameValueCollection).
Второй метод:
В методе-обработчике POST-запроса принимем параметр FormCollection, и опять же вручную обработаем этот параметр.
Третий метод:
Напишем свою версию обработки данных (ModelBinder) и добавим на обработку определенного типа данных.

Но всё же есть четвертый способ — предоставить правильно имена данных в представлении, корректно написать создание новых полей и предоставить работу по их обработке стандартному ModelBinderу, а на входе получить уже заполненый объект типа Customer с данными. Итак наше EditCustomer View:

Теперь опишем правильно jquery для добавления и удаления дополнительных полей:

Теперь опишем функцию на добавление:

Для того чтобы стандартный ModelBinder правильно обработал наш массив, индекс массива должен идти неразрывно, и поэтому, когда мы удаляем промежуточное поле например с номером 4, то все последующие надо пересчитать.

Вот и всё. Таким образом именованные поля формы стандартный ModelBinder сможет корректно обработать.

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