GridViewDeletedEventArgs GridViewDeletedEventArgs GridViewDeletedEventArgs GridViewDeletedEventArgs Class

Определение

Предоставляет данные для события RowDeleted.Provides data for the RowDeleted event.

public ref class GridViewDeletedEventArgs : EventArgs
public class GridViewDeletedEventArgs : EventArgs
type GridViewDeletedEventArgs = class
    inherit EventArgs
Public Class GridViewDeletedEventArgs
Inherits EventArgs
Наследование
GridViewDeletedEventArgsGridViewDeletedEventArgsGridViewDeletedEventArgsGridViewDeletedEventArgs

Примеры

Следующий пример демонстрирует, как использовать GridViewDeletedEventArgs объект, передаваемый в метод обработки событий для RowDeleted событие, чтобы определить, произошло ли исключение во время операции удаления.The following example demonstrates how to use the GridViewDeletedEventArgs object passed to the event-handling method for the RowDeleted event to determine whether an exception occurred during a delete operation.


<%@ Page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void CustomersGridView_RowDeleted(Object sender, GridViewDeletedEventArgs e)
  {

    // Use the Exception property to determine whether an exception
    // occurred during the delete operation.
    if (e.Exception == null)
    {
      // Use the AffectedRows property to determine whether the
      // record was deleted. Sometimes an error might occur that 
      // does not raise an exception, but prevents the delete
      // operation from completing.
      if (e.AffectedRows == 1)
      {
        Message.Text = "Record deleted successfully.";
      }
      else
      {
        Message.Text = "An error occurred during the delete operation.";
      }
    }
    else
    {
      // Insert the code to handle the exception.
      Message.Text = "An error occurred during the delete operation.";

      // Use the ExceptionHandled property to indicate that the 
      // exception is already handled.
      e.ExceptionHandled = true;
    }
    
  }
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridViewDeletedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridViewDeletedEventArgs Example</h3>
            
      <asp:label id="Message"
        forecolor="Red"          
        runat="server"/>
                
      <br/>
            
      <!-- The GridView control automatically sets the columns     -->
      <!-- specified in the datakeynames property as read-only.    -->
      <!-- No input controls are rendered for these columns in     -->
      <!-- edit mode.                                              -->
      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="true"
        autogeneratedeletebutton="true"
        datakeynames="CustomerID"
        onrowdeleted="CustomersGridView_RowDeleted"  
        runat="server">
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        deletecommand="Delete from Customers where CustomerID = @CustomerID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
      
    </form>
  </body>
</html>


<%@ Page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Sub CustomersGridView_RowDeleted(ByVal sender As Object, ByVal e As GridViewDeletedEventArgs)

    ' Use the Exception property to determine whether an exception
    ' occurred during the delete operation.
    If e.Exception Is Nothing Then

      ' Use the AffectedRows property to determine whether the
      ' record was deleted. Sometimes an error might occur that 
      ' does not raise an exception, but prevents the delete
      ' operation from completing.
      If e.AffectedRows = 1 Then
      
        Message.Text = "Record deleted successfully."
      
      Else
      
        Message.Text = "An error occurred during the delete operation."
      
      End If
    
    Else
          
      ' Insert the code to handle the exception.
      Message.Text = "An error occurred during the delete operation."

      ' Use the ExceptionHandled property to indicate that the 
      ' exception is already handled.
      e.ExceptionHandled = True
    
    End If
    
  End Sub
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridViewDeletedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridViewDeletedEventArgs Example</h3>
            
      <asp:label id="Message"
        forecolor="Red"          
        runat="server"/>
                
      <br/>
            
      <!-- The GridView control automatically sets the columns     -->
      <!-- specified in the datakeynames property as read-only.    -->
      <!-- No input controls are rendered for these columns in     -->
      <!-- edit mode.                                              -->
      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="true"
        autogeneratedeletebutton="true"
        datakeynames="CustomerID"
        onrowdeleted="CustomersGridView_RowDeleted"  
        runat="server">
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        deletecommand="Delete from Customers where CustomerID = @CustomerID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
      
    </form>
  </body>
</html>

Комментарии

GridView Управления вызывает RowDeleted событие, когда кнопку «Удалить» (кнопка с его CommandName , имеющим значение «Удалить») в элементе управления выбран, но после GridView управления удаляет запись.The GridView control raises the RowDeleted event when a Delete button (a button with its CommandName property set to "Delete") within the control is clicked, but after the GridView control deletes the record. Это позволяет предоставить метод обработки событий, который выполняет пользовательские действия, такие как проверка результатов операции удаления, при каждом возникновении этого события.This allows you to provide an event-handling method that performs a custom routine, such as checking the results of a delete operation, whenever this event occurs.

Объект GridViewDeletedEventArgs объект передается в метод обработки событий, который позволяет определить количество обработанных записей и любые исключения, которые могли возникнуть.A GridViewDeletedEventArgs object is passed to the event-handling method, which allows you to determine the number of records affected and any exceptions that might have occurred. Чтобы определить количество записей, затронутых операцией удаления, используйте AffectedRows свойство.To determine the number of records affected by the delete operation, use the AffectedRows property. Используйте Exception свойства, чтобы определить, произошла ли все исключения.Use the Exception property to determine whether any exceptions occurred. Можно также указать ли исключение обработано в метод обработки событий, задав ExceptionHandled свойство.You can also indicate whether the exception was handled in the event-handling method by setting the ExceptionHandled property.

Примечание

При возникновении исключения во время операции удаления и ExceptionHandled свойству false, GridView управления повторно создает исключение.If an exception occurs during the delete operation and the ExceptionHandled property is set to false, the GridView control re-throws the exception.

Если вы хотите получить доступ к пар "имя значение" ключевых полей и неключевых полей удаленной записи, используйте Keys и Values свойства, соответственно.If you want to access the name/value pairs of the key fields and non-key fields of the deleted record, use the Keys and Values properties, respectively.

Дополнительные сведения об обработке событий см. в разделе обработка и вызов событий.For more information about how to handle events, see Handling and Raising Events.

Конструкторы

GridViewDeletedEventArgs(Int32, Exception) GridViewDeletedEventArgs(Int32, Exception) GridViewDeletedEventArgs(Int32, Exception) GridViewDeletedEventArgs(Int32, Exception)

Инициализирует новый экземпляр класса GridViewDeletedEventArgs.Initializes a new instance of the GridViewDeletedEventArgs class.

Свойства

AffectedRows AffectedRows AffectedRows AffectedRows

Возвращает число строк, затронутых операцией удаления.Gets the number of rows affected by the delete operation.

Exception Exception Exception Exception

Возвращает исключение (если оно произошло), во время операции удаления.Gets the exception (if any) that was raised during the delete operation.

ExceptionHandled ExceptionHandled ExceptionHandled ExceptionHandled

Получает или задает значение, определяющее, было ли обработано произошедшее во время операции удаления исключение в данном обработчике.Gets or sets a value indicating whether an exception that was raised during the delete operation was handled in the event handler.

Keys Keys Keys Keys

Возвращает упорядоченный словарь, содержащий пары "имя/значение" для ключевых полей удаленной записи.Gets an ordered dictionary of key field name/value pairs for the deleted record.

Values Values Values Values

Получает словарь пар "имя/значение" для неключевых полей удаленной записи.Gets a dictionary of the non-key field name/value pairs for the deleted record.

Методы

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Определяет, равен ли заданный объект текущему объекту.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Служит хэш-функцией по умолчанию.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Возвращает объект Type для текущего экземпляра.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Создает неполную копию текущего объекта Object.Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Возвращает строку, представляющую текущий объект.Returns a string that represents the current object.

(Inherited from Object)

Применяется к

Дополнительно