GridViewDeletedEventArgs クラス

定義

RowDeleted イベントのデータを提供します。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
継承
GridViewDeletedEventArgs

次の例は、イベントGridViewDeletedEventArgs RowDeletedのイベント処理メソッドに渡されたオブジェクトを使用して、削除操作中に例外が発生したかどうかを判断する方法を示しています。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>

注釈

コントロール内で削除RowDeletedボタンCommandName (プロパティが "Delete" に設定されているボタン) をクリックGridViewしたときに、コントロールがレコードを削除すると、イベントが発生します。 GridViewThe 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. これにより、このイベントが発生するたびに、削除操作の結果を確認するなどのカスタムルーチンを実行するイベント処理メソッドを提供できます。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.

GridViewDeletedEventArgsオブジェクトは、イベント処理メソッドに渡されます。これにより、影響を受けるレコードの数と発生した可能性のある例外を確認できます。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. 削除操作によって影響を受けたレコードの数を確認AffectedRowsするには、プロパティを使用します。To determine the number of records affected by the delete operation, use the AffectedRows property. プロパティをException使用して、例外が発生したかどうかを確認します。Use the Exception property to determine whether any exceptions occurred. また、 ExceptionHandledプロパティを設定することによって、イベント処理メソッドで例外が処理されたかどうかを示すこともできます。You can also indicate whether the exception was handled in the event-handling method by setting the ExceptionHandled property.

注意

削除操作中に例外が発生しExceptionHandled 、プロパティがにfalse設定されてGridViewいる場合、コントロールは例外を再スローします。If an exception occurs during the delete operation and the ExceptionHandled property is set to false, the GridView control re-throws the exception.

削除されたレコードのキーフィールドとキー以外のフィールドの名前と値のペアにアクセスする場合は、それぞれKeysプロパティValuesとプロパティを使用します。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.

イベントを処理する方法の詳細については、次を参照してください。処理とイベントの発生します。For more information about how to handle events, see Handling and Raising Events.

コンストラクター

GridViewDeletedEventArgs(Int32, Exception)

GridViewDeletedEventArgs クラスの新しいインスタンスを初期化します。Initializes a new instance of the GridViewDeletedEventArgs class.

プロパティ

AffectedRows

削除操作の影響を受けた行の数を取得します。Gets the number of rows affected by the delete operation.

Exception

削除操作中に例外が発生した場合は、その例外を取得します。Gets the exception (if any) that was raised during the delete operation.

ExceptionHandled

削除操作中に発生した例外がイベント ハンドラーで処理されたかどうかを示す値を取得または設定します。Gets or sets a value indicating whether an exception that was raised during the delete operation was handled in the event handler.

Keys

削除されたレコードのキー フィールドの名前と値のペアの並べ替え後のディクショナリを取得します。Gets an ordered dictionary of key field name/value pairs for the deleted record.

Values

削除されたレコードのキー以外のフィールドの名前と値のペアのディクショナリを取得します。Gets a dictionary of the non-key field name/value pairs for the deleted record.

メソッド

Equals(Object)

指定したオブジェクトが、現在のオブジェクトと等しいかどうかを判断します。Determines whether the specified object is equal to the current object.

(継承元 Object)
GetHashCode()

既定のハッシュ関数として機能します。Serves as the default hash function.

(継承元 Object)
GetType()

現在のインスタンスの Type を取得します。Gets the Type of the current instance.

(継承元 Object)
MemberwiseClone()

現在の Object の簡易コピーを作成します。Creates a shallow copy of the current Object.

(継承元 Object)
ToString()

現在のオブジェクトを表す文字列を返します。Returns a string that represents the current object.

(継承元 Object)

適用対象

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