Επεξεργασία

Κοινή χρήση μέσω

ButtonColumn.CommandName Property

  • Reference

Definition

Namespace:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Gets or sets a string that represents the command to perform when a button in the ButtonColumn object is clicked.

public:
 virtual property System::String ^ CommandName { System::String ^ get(); void set(System::String ^ value); };
public virtual string CommandName { get; set; }
member this.CommandName : string with get, set
Public Overridable Property CommandName As String

Property Value

String

A string that represents the command to perform when a button in the ButtonColumn is clicked. The default is an empty string ("").

Examples

The following code example demonstrates how to use the CommandName property to associate a command name with a button. Then, the command name of the clicked button is determined programmatically in the event handler for the ItemCommand event and the appropriate action is performed.


<%@ 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">

    protected void Page_Init(object sender, EventArgs e)
    {
       // Create dynamic column to add to Columns collection.
       ButtonColumn AddColumn = new ButtonColumn();
       AddColumn.HeaderText="Add Item"; 
       AddColumn.Text="Add";
       AddColumn.CommandName="Add";
       AddColumn.ButtonType = ButtonColumnType.PushButton;

       // Add column to Columns collection.
       ItemsGrid.Columns.AddAt(0, AddColumn);
    }


    protected void ItemsGrid_ItemCommand(object source, DataGridCommandEventArgs e)
    {
        if (e.CommandName == "Add")
        {
            // Add logic for addition operation here.
            this.TextBox1.Text = "Added";
        }

    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>Untitled Page</title>
  </head>
  <body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" Text="Button" /><br />
        <asp:DataGrid 
          ID="ItemsGrid" 
          runat="server" 
          DataSourceID="CustomersSqlDataSource" 
          AutoGenerateColumns="true" 
          OnItemCommand="ItemsGrid_ItemCommand" />
        
        <!-- This example uses Microsoft SQL Server and connects -->
        <!-- to the Northwind sample database.                   -->
        <asp:sqldatasource id="CustomersSqlDataSource"  
          selectcommand="Select [CustomerID], [CompanyName], [ContactName], [ContactTitle] From [Customers]"
          connectionstring="<%$ ConnectionStrings:NorthWindConnection%>"
          runat="server">
        </asp:sqldatasource>

    </div>
    </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">

    Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)
        ' Create dynamic column to add to Columns collection.
        Dim AddColumn As New ButtonColumn
        AddColumn.HeaderText = "Add Item"
        AddColumn.Text = "Add"
        AddColumn.CommandName = "Add"
        AddColumn.ButtonType = ButtonColumnType.PushButton

        ' Add column to Columns collection.
        ItemsGrid.Columns.AddAt(0, AddColumn)
    End Sub


    Protected Sub ItemsGrid_ItemCommand(ByVal source As Object, ByVal e As DataGridCommandEventArgs)
        If e.CommandName = "Add" Then
            ' Add logic for addition operation here.
            TextBox1.Text = "Added"          
        End If
    End Sub
    
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="head1" runat="server">
    <title>Untitled Page</title>
  </head>
  <body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" Text="Button" /><br />
        <asp:DataGrid 
          ID="ItemsGrid" 
          runat="server" 
          DataSourceID="CustomersSqlDataSource" 
          AutoGenerateColumns="true" 
          OnItemCommand="ItemsGrid_ItemCommand" />
        
        <!-- This example uses Microsoft SQL Server and connects -->
        <!-- to the Northwind sample database.                   -->
        <asp:sqldatasource id="CustomersSqlDataSource"  
          selectcommand="Select [CustomerID], [CompanyName], [ContactName], [ContactTitle] From [Customers]"
          connectionstring="<%$ ConnectionStrings:NorthWindConnection%>"
          runat="server">
        </asp:sqldatasource>

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

Remarks

Use the CommandName property to associate a command name, such as Add or Remove, with a button. You can set the CommandName property to any string that identifies the action to perform when a button in the System.Web.UI.WebControls.ButtonColumn object is clicked. Then, you can determine programmatically the command name in the event handler for the ItemCommand event and perform the appropriate actions.

The value of this property is stored in view state.

Applies to

See also