GridViewCommandEventArgs.CommandSource プロパティとは? わかりやすく解説

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GridViewCommandEventArgs.CommandSource 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。

コマンドソース取得します

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 GridViewCommandEventArgs
Dim value As Object

value = instance.CommandSource
public Object CommandSource { get; }
public:
property Object^ CommandSource {
    Object^ get ();
}
/** @property */
public Object get_CommandSource ()

プロパティ
コマンドソースを表す System.Object クラスインスタンス

解説解説
使用例使用例

CommandSource プロパティ使用してユーザークリックしたボタン格納されている GridView コントロールアクセスする方法次の例に示します

<%@ Page language="VB" %>

<script runat="server">

  Sub CustomersGridView_RowCommand(ByVal sender
 As Object, ByVal e As
 GridViewCommandEventArgs)
  
    ' If multiple ButtonField columns are used, use the
    ' CommandName property to determine which button was clicked.
    If e.CommandName = "Add" Then
    
      ' Convert the row index stored in the CommandArgument
      ' property to an Integer.
      Dim index As Integer
 = Convert.ToInt32(e.CommandArgument)

      ' Retrieve the row that contains the button clicked
      ' by the user from the Rows collection. Use the
      ' CommandSource property to access the GridView control.
      Dim customersGridView As GridView = CType(e.CommandSource,
 GridView)
      Dim row As GridViewRow = customersGridView.Rows(index)

      ' Create a new ListItem object for the customer in the row.
      Dim item As New ListItem()
      item.Text = Server.HtmlDecode(row.Cells(1).Text) + " "
 + Server.HtmlDecode(row.Cells(2).Text)

      ' If the author is not already in the ListBox, add the ListItem
      ' object to the Items collection of a ListBox control.
      If Not CustomersListBox.Items.Contains(item)
 Then
      
        CustomersListBox.Items.Add(item)
        
      End If
    End If
        
  End Sub

  Sub CustomersGridView_RowCreated(ByVal sender
 As Object, ByVal e As
 GridViewRowEventArgs)

    ' The GridViewCommandEventArgs class does not contain a
    ' property that indicates which row's command button was
    ' clicked. To identify which row was clicked, use the button's
    ' CommandArgument property by setting it to the row's index.
    If e.Row.RowType = DataControlRowType.DataRow Then

      ' Retrieve the LinkButton control from the first column.
      Dim addButton As LinkButton = CType(e.Row.Cells(0).Controls(0),
 LinkButton)

      ' Set the LinkButton's CommandArgument property with the
      ' row's index.
      addButton.CommandArgument = e.Row.RowIndex.ToString()
      
    End If

  End Sub

</script>

<html>
  <body>
    <form runat="server">

      <h3>GridViewCommandEventArgs Example</h3>

      <table width="100%">
        <tr>
          <td width="50%">
            <asp:gridview id="CustomersGridView"
 
              datasourceid="CustomersSource" 
              autogeneratecolumns="false"
              onrowcommand="CustomersGridView_RowCommand"
              onrowcreated="CustomersGridView_RowCreated"
  
              runat="server">
                
              <columns>
                
                <asp:buttonfield buttontype="Link"
 commandname="Add" text="Add"/>
                <asp:boundfield datafield="CompanyName"
 
                  headertext="Company Name"/>
                <asp:boundfield datafield="City"
 
                  headertext="City"/>
                
              </columns>
                
            </asp:gridview>
          </td>

          <td valign="top" width="50%">
             Customers: <br/>
             <asp:listbox id="CustomersListBox"
               runat="server"/>
          </td>
        </tr>
      </table>

      <!-- 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="CustomersSource"
        selectcommand="Select [CustomerID], [CompanyName], [City]
 From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
 
        runat="server"/>

    </form>
  </body>
</html>

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

<script runat="server">

  void CustomersGridView_RowCommand(Object sender, GridViewCommandEventArgs
 e)
  {
    // If multiple ButtonField columns are used, use the
    // CommandName property to determine which button was clicked.
    if(e.CommandName=="Add")
    {
      // Convert the row index stored in the CommandArgument
      // property to an Integer.
      int index = Convert.ToInt32(e.CommandArgument);

      // Retrieve the row that contains the button clicked
      // by the user from the Rows collection. Use the
      // CommandSource property to access the GridView control.
      GridView customersGridView = (GridView)e.CommandSource;
      GridViewRow row = customersGridView.Rows[index];

      // Create a new ListItem object for the customer in the row.
      ListItem item = new ListItem();
      item.Text = Server.HtmlDecode(row.Cells[1].Text) + " " + Server.HtmlDecode(row.Cells[2].Text);

      // If the author is not already in the ListBox, add the ListItem
      // object to the Items collection of a ListBox control.
      if(!CustomersListBox.Items.Contains(item))
      {
        CustomersListBox.Items.Add(item);
      }
    }
  }

  void CustomersGridView_RowCreated(Object sender, GridViewRowEventArgs
 e)
  {

    // The GridViewCommandEventArgs class does not contain a
    // property that indicates which row's command button was
    // clicked. To identify which row was clicked, use the button's
    // CommandArgument property by setting it to the row's index.
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
      // Retrieve the LinkButton control from the first column.
      LinkButton addButton = (LinkButton)e.Row.Cells[0].Controls[0];

      // Set the LinkButton's CommandArgument property with the
      // row's index.
      addButton.CommandArgument = e.Row.RowIndex.ToString();
    }

  }

</script>

<html>
  <body>
    <form runat="server">

      <h3>GridViewCommandEventArgs Example</h3>

      <table width="100%">
        <tr>
          <td width="50%">
            <asp:gridview id="CustomersGridView" 
              datasourceid="CustomersSource" 
              autogeneratecolumns="false"
              onrowcommand="CustomersGridView_RowCommand"
              onrowcreated="CustomersGridView_RowCreated"  
              runat="server">
                
              <columns>
                
                <asp:buttonfield buttontype="Link" commandname="Add"
 text="Add"/>
                <asp:boundfield datafield="CompanyName" 
                  headertext="Company Name"/>
                <asp:boundfield datafield="City" 
                  headertext="City"/>
                
              </columns>
                
            </asp:gridview>
          </td>

          <td valign="top" width="50%">
             Customers: <br/>
             <asp:listbox id="CustomersListBox"
               runat="server"/>
          </td>
        </tr>
      </table>

      <!-- 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="CustomersSource"
        selectcommand="Select [CustomerID], [CompanyName], [City] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
 
        runat="server"/>

    </form>
  </body>
</html>

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参照参照
関連項目
GridViewCommandEventArgs クラス
GridViewCommandEventArgs メンバ
System.Web.UI.WebControls 名前空間
System.Object
GridView クラス


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