GridViewDeletedEventHandler Delegált
Definíció
Fontos
Egyes információk olyan, kiadás előtti termékekre vonatkoznak, amelyek a kiadásig még jelentősen módosulhatnak. A Microsoft nem vállal kifejezett vagy törvényi garanciát az itt megjelenő információért.
A vezérlőelem eseményét kezelő RowDeleted metódust GridView jelöli.
public delegate void GridViewDeletedEventHandler(System::Object ^ sender, GridViewDeletedEventArgs ^ e);public delegate void GridViewDeletedEventHandler(object sender, GridViewDeletedEventArgs e);type GridViewDeletedEventHandler = delegate of obj * GridViewDeletedEventArgs -> unitPublic Delegate Sub GridViewDeletedEventHandler(sender As Object, e As GridViewDeletedEventArgs)Paraméterek
- sender
- Object
Az esemény forrása.
Az GridViewDeletedEventArgs eseményadatokat tartalmazó A.
Példák
Az alábbi példa bemutatja, hogyan adhat hozzá delegáltat GridViewDeletedEventHandler programozott módon egy RowDeletedGridView vezérlő eseményéhez.
<%@ 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 Page_Load(Object sender, EventArgs e)
{
// Create a new GridView control.
GridView customersGridView = new GridView();
// Set the GridView control's properties.
customersGridView.ID = "CustomersGridView";
customersGridView.DataSourceID = "CustomersSqlDataSource";
customersGridView.AutoGenerateColumns = true;
customersGridView.AutoGenerateDeleteButton = true;
customersGridView.DataKeyNames = new String[1] { "CustomerID" };
// Programmatically register the event-handling method
// for the RowDeleted event of the GridView control.
customersGridView.RowDeleted += new GridViewDeletedEventHandler(this.CustomersGridView_RowDeleted);
// Add the GridView control to the Controls collection
// of the PlaceHolder control.
GridViewPlaceHolder.Controls.Add(customersGridView);
}
void CustomersGridView_RowDeleted(Object sender, GridViewDeletedEventArgs e)
{
// Display whether the delete operation succeeded.
if(e.Exception == null)
{
Message.Text = "Row deleted successfully.";
}
else
{
Message.Text = "An error occurred while attempting to deleting the row.";
e.ExceptionHandled = true;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewDeletedEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewDeletedEventHandler Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:placeholder id="GridViewPlaceHolder"
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="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 Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Create a new GridView control.
Dim customersGridView As New GridView()
' Set the GridView control's properties.
customersGridView.ID = "CustomersGridView"
customersGridView.DataSourceID = "CustomersSqlDataSource"
customersGridView.AutoGenerateColumns = True
customersGridView.AutoGenerateDeleteButton = True
Dim keyArray() As String = {"CustomerID"}
customersGridView.DataKeyNames = keyArray
' Programmatically register the event-handling method
' for the RowDeleted event of the GridView control.
AddHandler customersGridView.RowDeleted, AddressOf CustomersGridView_RowDeleted
' Add the GridView control to the Controls collection
' of the PlaceHolder control.
GridViewPlaceHolder.Controls.Add(customersGridView)
End Sub
Sub CustomersGridView_RowDeleted(ByVal sender As Object, ByVal e As GridViewDeletedEventArgs)
' Display whether the delete operation succeeded.
If e.Exception Is Nothing Then
Message.Text = "Row deleted successfully."
Else
Message.Text = "An error occurred while attempting to deleting the row."
e.ExceptionHandled = True
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewDeletedEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewDeletedEventHandler Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:placeholder id="GridViewPlaceHolder"
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>
Az alábbi példa bemutatja, hogyan adhat hozzá deklaratív módon meghatalmazottat GridViewDeletedEventHandler egy RowDeletedGridView vezérlőelem eseményéhez.
<%@ 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_RowDeleted(Object sender, GridViewDeletedEventArgs e)
{
// Display whether the delete operation succeeded.
if(e.Exception == null)
{
Message.Text = "Row deleted successfully.";
}
else
{
Message.Text = "An error occurred while attempting to delete the row.";
e.ExceptionHandled = true;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView RowDeleted Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView RowDeleted Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="true"
autogeneratedeletebutton="true"
datakeynames="CustomerID"
onrowdeleted="CustomersGridView_RowDeleted"
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]"
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_RowDeleted(sender As Object, e As GridViewDeletedEventArgs)
' Display whether the delete operation succeeded.
If e.Exception Is Nothing Then
Message.Text = "Row deleted successfully."
Else
Message.Text = "An error occurred while attempting to delete the row."
e.ExceptionHandled = True
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView RowDeleted Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView RowDeleted Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="true"
autogeneratedeletebutton="true"
datakeynames="CustomerID"
onrowdeleted="CustomersGridView_RowDeleted"
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]"
deletecommand="Delete from Customers where CustomerID = @CustomerID"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
Megjegyzések
A GridView vezérlő akkor aktiválja az RowDeleted eseményt, ha a vezérlőn belül egy Törlés gombra (a tulajdonsága CommandName "Törlés" értékre van állítva) kattint, de miután a GridView vezérlő törli a rekordot. Ez lehetővé teszi, hogy olyan eseménykezelési módszert biztosítson, amely egyéni rutint hajt végre, például egy törlési művelet eredményeinek ellenőrzését, amikor ez az esemény bekövetkezik.
Meghatalmazott létrehozásakor GridViewDeletedEventHandler azonosítja az eseményt kezelő metódust. Az esemény eseménykezelőhöz való társításához adja hozzá a meghatalmazott egy példányát az eseményhez. Az eseménykezelőt mindig meghívja a rendszer, ha nem távolítja el a meghatalmazottat. Az eseménykezelő delegáltjaival kapcsolatos további információkért lásd: Események kezelése és emelése.
Bővítő metódusok
| Name | Description |
|---|---|
| GetMethodInfo(Delegate) |
Lekéri a megadott meghatalmazott által képviselt metódust képviselő objektumot. |
