GridViewDeletedEventArgs.Values プロパティとは? わかりやすく解説

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GridViewDeletedEventArgs.Values プロパティ

メモ : このプロパティは、.NET Framework version 2.0新しく追加されたものです。

削除されレコード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

名前空間: System.Web.UI.WebControls
アセンブリ: System.Web (system.web.dll 内)
構文構文

Dim instance As GridViewDeletedEventArgs
Dim value As IOrderedDictionary

value = instance.Values
public IOrderedDictionary Values { get; }
public:
property IOrderedDictionary^ Values {
    IOrderedDictionary^ get ();
}
/** @property */
public IOrderedDictionary get_Values ()
public function get Values
 () : IOrderedDictionary

プロパティ
削除されレコード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格納している IOrderedDictionary。

解説解説
使用例使用例

Values プロパティ使用して削除されレコードキー以外のフィールドの値にアクセスする方法の例を次に示します

<%@ Page language="VB" %>

<script runat="server">

  Sub CustomersGridView_RowDeleted(ByVal sender
 As Object, ByVal e As
 GridViewDeletedEventArgs)
  
    Dim entry As DictionaryEntry
    
    ' Display the value of the key fields in the Keys property.
    KeysMessageLabel.Text = _
      "The key fields for the deleted record are: <br/>"

    ' In VB, you cannot iterate through the DictionaryEntry objects
    ' in the Keys property directly. Use the CopyTo method to 
    ' copy the objects to an array first.
    Dim keysArray(e.Keys.Count - 1) As DictionaryEntry
    e.Keys.CopyTo(keysArray, 0)
    
    ' Iterate through the array and display its values.
    For Each entry In keysArray
    
      DisplayValue(entry, KeysMessageLabel)
    
    Next

    ' Display the value of the non-key fields in the Values 
    ' property.
    ValuesMessageLabel.Text = _
      "The non-key fields for the deleted record are: <br/>"

    Dim valuesArray(e.Values.Count - 1) As
 DictionaryEntry
    e.Values.CopyTo(valuesArray, 0)

    For Each entry In valuesArray
    
      DisplayValue(entry, ValuesMessageLabel)
    
    Next

  End Sub

  Sub DisplayValue(ByVal entry As
 DictionaryEntry, ByVal displayLabel As Label)
  
    ' Display the field name contained in the DictionaryEntry object.
    If entry.Key IsNot Nothing Then
    
      displayLabel.Text &= "Name=" & entry.Key.ToString()
 & ", "
    
    Else
    
      displayLabel.Text &= "Name=null, "
      
    End If

    ' Display the field value contained in the DictionaryEntry object.
    If entry.Value IsNot Nothing Then
    
      displayLabel.Text &= "Value=" & entry.Value.ToString()
 & "<br/>"
    
    Else
    
      displayLabel.Text &= "Value=null<br/>"
      
    End If
        
  End Sub
    
</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridViewDeletedEventArgs Keys and Values 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"
        allowpaging="true" 
        datakeynames="CustomerID"
        onrowdeleted="CustomersGridView_RowDeleted"
  
        runat="server">
      </asp:gridview>
      
      <br/>
      
      <asp:label id="KeysMessageLabel"
        forecolor="Red"
        runat="server"/>
          
      <br/><br/>
          
      <asp:label id="ValuesMessageLabel"
        forecolor="Red"
        runat="server"/>
            
      <!-- 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="C#" %>

<script runat="server">

  void CustomersGridView_RowDeleted(Object sender, GridViewDeletedEventArgs
 e)
  {
    // Display the value of the key fields in the Keys property.
    KeysMessageLabel.Text =
      "The key fields for the deleted record are: <br/>";

    foreach (DictionaryEntry entry in e.Keys)
    {
      DisplayValue(entry, KeysMessageLabel);
    }

    // Display the value of the non-key fields in the Values 
    // property.
    ValuesMessageLabel.Text =
      "The non-key fields for the deleted record are: <br/>";

    foreach (DictionaryEntry entry in e.Values)
    {
      DisplayValue(entry, ValuesMessageLabel);
    }

  }

  void DisplayValue(DictionaryEntry entry, Label displayLabel)
  {
    // Display the field name contained in the DictionaryEntry object.
    if (entry.Key != null)
    {
      displayLabel.Text += "Name=" + entry.Key.ToString() + ", ";
    }
    else
    {
      displayLabel.Text += "Name=null, ";
    }

    // Display the field value contained in the DictionaryEntry object.
    if (entry.Value != null)
    {
      displayLabel.Text += "Value=" + entry.Value.ToString() + "<br/>";
    }
    else
    {
      displayLabel.Text += "Value=null<br/>";
    }
  }
    
</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridViewDeletedEventArgs Keys and Values 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"
        allowpaging="true" 
        datakeynames="CustomerID"
        onrowdeleted="CustomersGridView_RowDeleted"  
        runat="server">
      </asp:gridview>
      
      <br/>
      
      <asp:label id="KeysMessageLabel"
        forecolor="Red"
        runat="server"/>
          
      <br/><br/>
          
      <asp:label id="ValuesMessageLabel"
        forecolor="Red"
        runat="server"/>
            
      <!-- 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>

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参照参照
関連項目
GridViewDeletedEventArgs クラス
GridViewDeletedEventArgs メンバ
System.Web.UI.WebControls 名前空間
GridView クラス
GridViewDeletedEventHandler
System.Collections.Specialized.IOrderedDictionary
System.Collections.DictionaryEntry
GridViewDeletedEventArgs.Keys プロパティ
GridView.RowDeleted イベント



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