ButtonField.CommandName 属性
定义
重要
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获取或设置一个字符串，该字符串表示当单击 ButtonField 对象中的按钮时要执行的操作。
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, setPublic Overridable Property CommandName As String属性值
当单击 ButtonField 中的按钮时要执行的操作的名称。
示例
下面的代码示例演示如何使用 CommandName 属性为控件的 对象GridView中的ButtonField按钮指定命令名称。
<%@ 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_RowCommand(Object sender, GridViewCommandEventArgs e)
{
// If multiple ButtonField column fields are used, use the
// CommandName property to determine which button was clicked.
if(e.CommandName=="Select")
{
// Convert the row index stored in the CommandArgument
// property to an Integer.
int index = Convert.ToInt32(e.CommandArgument);
// Get the last name of the selected author from the appropriate
// cell in the GridView control.
GridViewRow selectedRow = CustomersGridView.Rows[index];
TableCell contactName = selectedRow.Cells[1];
string contact = contactName.Text;
// Display the selected author.
Message.Text = "You selected " + contact + ".";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ButtonField Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>ButtonField Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"
AssociatedControlID="CustomersGridView"/>
<!-- Populate the Columns collection declaratively. -->
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="false"
onrowcommand="CustomersGridView_RowCommand"
runat="server">
<columns>
<asp:buttonfield buttontype="Button"
commandname="Select"
headertext="Select Customer"
text="Select"/>
<asp:boundfield datafield="CompanyName"
headertext="Company Name"/>
<asp:boundfield datafield="ContactName"
headertext="Contact Name"/>
</columns>
</asp:gridview>
<!-- 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>
</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_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)
' If multiple ButtonField column fields are used, use the
' CommandName property to determine which button was clicked.
If e.CommandName = "Select" Then
' Convert the row index stored in the CommandArgument
' property to an Integer.
Dim index As Integer = Convert.ToInt32(e.CommandArgument)
' Get the last name of the selected author from the appropriate
' cell in the GridView control.
Dim selectedRow As GridViewRow = CustomersGridView.Rows(index)
Dim contactCell As TableCell = selectedRow.Cells(1)
Dim contact As String = contactCell.Text
' Display the selected author.
Message.Text = "You selected " & contact & "."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ButtonField Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>ButtonField Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"
AssociatedControlID="CustomersGridView"/>
<!-- Populate the Columns collection declaratively. -->
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="false"
onrowcommand="CustomersGridView_RowCommand"
runat="server">
<columns>
<asp:buttonfield buttontype="Button"
commandname="Select"
headertext="Select Customer"
text="Select"/>
<asp:boundfield datafield="CompanyName"
headertext="Company Name"/>
<asp:boundfield datafield="ContactName"
headertext="Contact Name"/>
</columns>
</asp:gridview>
<!-- 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>
</form>
</body>
</html>
注解
CommandName使用 属性将命令名称（如 "Add" 或 "Remove"）与 对象中的ButtonField按钮相关联。 可以将 属性设置为 CommandName 任何字符串，用于标识单击命令按钮时要执行的操作。 然后，可以通过编程方式确定事件处理程序中的命令名称，并执行相应的操作。
注意
对象中的所有 ButtonField 按钮共享相同的命令名称。
数据绑定控件可识别某些命令名称，并自动引发和处理控件的相应事件。 可识别以下命令名称：
"Cancel""Delete""Edit""Insert""New""Page""Select""Sort""Update"
若要调用分页，请将 包含Button控件的 设置为 CommandName"Page" ，将 CommandArgument 设置为 "First"、"Last"、 "Prev""Next"或页码。 但是，由于 CommandArgument 控件的 ButtonField 始终是整数行索引， ButtonField 因此控件不适合调用分页。 同样，虽然可以通过将 设置为 CommandName"Sort"来调用排序， CommandArgument 但控件的 ButtonField 属性始终是整数行索引。 因此， ButtonField 控件不适合调用排序。 对于自定义命令名称（如 "Add" 和 "Remove"），需要编写事件代码来检查命令名称并执行一些自定义操作。 有关详细信息，请参阅 DataControlCommands。
注意
并非所有命令名称都由每个数据绑定控件识别。 例如， "New" 由 控件无法识别 GridView ，并且 "Select" 控件无法识别 DetailsView 。
此属性的值存储在视图状态中。
