GridView.EditIndex 屬性
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得或設定要編輯之資料列的索引。
public:
virtual property int EditIndex { int get(); void set(int value); };public virtual int EditIndex { get; set; }member this.EditIndex : int with get, setPublic Overridable Property EditIndex As Integer屬性值
要編輯的資料列之以零起始的索引。 預設值為 -1，表示沒有任何資料列正在編輯。
例外狀況
指定的索引小於 -1。
範例
下列範例示範如何使用 EditIndex 屬性來判斷在 控制項中 GridView 編輯資料列之後更新的資料列。 隨即顯示訊息，指出更新成功。
<%@ 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)
{
// Clear the message label when the user enters edit mode.
if (e.CommandName == "Edit")
{
Message.Text = "";
}
}
void CustomersGridView_RowUpdated(Object sender, GridViewUpdatedEventArgs e)
{
// The update operation was successful. Retrieve the row being edited.
int index = CustomersGridView.EditIndex;
GridViewRow row = CustomersGridView.Rows[index];
// Notify the user that the update was successful.
Message.Text = "Updated record " + row.Cells[1].Text + ".";
}
void CustomersGridView_RowCancelingEdit(Object sender, GridViewCancelEditEventArgs e)
{
// The update operation was canceled. Display the appropriate message.
Message.Text = "Update operation canceled.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView Rows Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView Rows 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"
allowpaging="true"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="true"
autogenerateeditbutton="true"
datakeynames="CustomerID"
onrowcommand="CustomersGridView_RowCommand"
onrowupdated="CustomersGridView_RowUpdated"
onrowcancelingedit="CustomersGridView_RowCancelingEdit"
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]"
updatecommand="Update Customers SET CompanyName=@CompanyName, Address=@Address, City=@City, PostalCode=@PostalCode, Country=@Country WHERE (CustomerID = @CustomerID)"
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_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)
' Clear the message label when the user enters edit mode.
If e.CommandName = "Edit" Then
Message.Text = ""
End If
End Sub
Sub CustomersGridView_RowUpdated(ByVal sender As Object, ByVal e As GridViewUpdatedEventArgs)
' The update operation was successful. Retrieve the row being edited.
Dim index As Integer = CustomersGridView.EditIndex
Dim row As GridViewRow = CustomersGridView.Rows(index)
' Notify the user that the update was successful.
Message.Text = "Updated record " & row.Cells(1).Text + "."
End Sub
Sub CustomersGridView_RowCancelingEdit(ByVal sender As Object, ByVal e As GridViewCancelEditEventArgs)
' The update operation was canceled. Display the appropriate message.
Message.Text = "Update operation canceled."
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView Rows Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView Rows 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"
allowpaging="true"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="true"
autogenerateeditbutton="true"
datakeynames="CustomerID"
onrowcommand="CustomersGridView_RowCommand"
onrowupdated="CustomersGridView_RowUpdated"
onrowcancelingedit="CustomersGridView_RowCancelingEdit"
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]"
updatecommand="Update Customers SET CompanyName=@CompanyName, Address=@Address, City=@City, PostalCode=@PostalCode, Country=@Country WHERE (CustomerID = @CustomerID)"
deletecommand="Delete from Customers where CustomerID = @CustomerID"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
備註
資料列索引是以零起始， (第一個資料列是資料列零) 。
此屬性通常用於下列案例，其中包含特定事件的處理常式：
GridView您希望控制項在第一次顯示頁面時，以編輯模式開啟特定資料列。 若要這樣做，您可以在 類別或 GridView 控制項之 事件的 Page 處理常式 Load 中設定 EditIndex 屬性。
您想要知道在更新資料列之後，已編輯哪一個資料列。 若要這樣做，您可以從事件處理常式中的 RowUpdated 屬性擷取資料列索引 EditIndex 。
您要透過程式設計方式設定 DataSource 屬性， GridView 將控制項系結至資料來源。 在此情況下， EditIndex 您必須在 和 RowCancelingEdit 事件處理常式中 RowEditing 設定 屬性。
如果您在回傳之後或在事件之後 Load 引發之事件的處理常式中設定 EditIndex 屬性， GridView 控制項可能不會針對指定的資料列進入編輯模式。 如果您在其他事件處理常式中讀取此屬性的值，則不保證索引會反映正在編輯的資料列。
若要判斷使用者在控制項進入編輯模式之前 GridView ，按一下中的[編輯] 按鈕或超連結，您可以從事件處理常式中 RowEditing 物件的 屬性 GridViewEditEventArgs 擷取資料列索引 NewEditIndex 。
若要防止 GridView 控制項在使用者按一下 [編輯] 按鈕或超連結之後進入編輯模式，請在事件處理常式中 RowEditing 將 物件的 屬性 GridViewEditEventArgs 設定 Cancel 為 true 。
