DetailsViewDeletedEventHandler Temsilci
Tanım
Önemli
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Bir denetimin olayını DetailsView işleyen ItemDeleted yöntemi temsil eder.
public delegate void DetailsViewDeletedEventHandler(System::Object ^ sender, DetailsViewDeletedEventArgs ^ e);public delegate void DetailsViewDeletedEventHandler(object sender, DetailsViewDeletedEventArgs e);type DetailsViewDeletedEventHandler = delegate of obj * DetailsViewDeletedEventArgs -> unitPublic Delegate Sub DetailsViewDeletedEventHandler(sender As Object, e As DetailsViewDeletedEventArgs)Parametreler
- sender
- Object
Olayın kaynağı.
DetailsViewDeletedEventArgs Olay verilerini içeren bir.
Örnekler
Aşağıdaki kod örneği, bir denetimin olayına DetailsView program aracılığıyla temsilci ItemDeleted eklemeyi DetailsViewDeletedEventHandler gösterir.
<%@ page language="C#"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
// Create a new DetailsView object.
DetailsView customerDetailsView = new DetailsView();
// Set the DetailsView object's properties.
customerDetailsView.ID = "CustomerDetailsView";
customerDetailsView.DataSourceID = "DetailsViewSource";
customerDetailsView.AutoGenerateRows = true;
customerDetailsView.AutoGenerateDeleteButton = true;
customerDetailsView.AllowPaging = true;
customerDetailsView.PagerSettings.Mode =
PagerButtons.NextPrevious;
customerDetailsView.DataKeyNames = new String[1] { "CustomerID" };
// Programmatically register the event-handling method
// for the ItemDeleted event of a DetailsView control.
customerDetailsView.ItemDeleted +=
new DetailsViewDeletedEventHandler(
this.CustomerDetailView_ItemDeleted);
// Add the DetailsView object to the Controls collection
// of the PlaceHolder control.
DetailsViewPlaceHolder.Controls.Add(customerDetailsView);
}
void CustomerDetailView_ItemDeleted(Object sender,
DetailsViewDeletedEventArgs e)
{
// Use the Exception property to determine whether an exception
// occurred during the delete operation.
if (e.Exception == null)
{
// Use the AffectedRows property to determine the numbers of
// rows affected by the delete operation.
if (e.AffectedRows == 1)
{
MessageLabel.Text = e.AffectedRows.ToString()
+ " record deleted successfully.";
}
else
{
MessageLabel.Text = e.AffectedRows.ToString()
+ " records deleted successfully.";
}
}
else
{
// Insert the code to handle the exception.
MessageLabel.Text = e.Exception.Message;
// Use the ExceptionHandled property to indicate that the
// exception is already handled.
e.ExceptionHandled = true;
}
}
</script>
<head runat="server">
<title>DetailsViewDeletedEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewDeletedEventHandler Example</h3>
<!-- Use a PlaceHolder control as the container for the -->
<!-- dynamically generated DetailsView control. -->
<asp:PlaceHolder id="DetailsViewPlaceHolder"
runat="server"/>
<br/><br/>
<asp:label id="MessageLabel"
forecolor="Red"
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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
deletecommand="Delete [Customers]
Where [CustomerID]=@CustomerID"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server">
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Create a new DetailsView object.
Dim customerDetailsView As New DetailsView()
' Set the DetailsView object's properties.
customerDetailsView.ID = "CustomerDetailsView"
customerDetailsView.DataSourceID = "DetailsViewSource"
customerDetailsView.AutoGenerateRows = True
customerDetailsView.AutoGenerateDeleteButton = True
customerDetailsView.AllowPaging = True
customerDetailsView.PagerSettings.Mode = _
PagerButtons.NextPrevious
Dim keyArray() As String = {"CustomerID"}
customerDetailsView.DataKeyNames = keyArray
' Programmatically register the event-handling method
' for the ItemDeleted event of a DetailsView control.
AddHandler customerDetailsView.ItemDeleted, _
AddressOf CustomerDetailView_ItemDeleted
' Add the DetailsView object to the Controls collection
' of the PlaceHolder control.
DetailsViewPlaceHolder.Controls.Add(customerDetailsView)
End Sub
Sub CustomerDetailView_ItemDeleted(ByVal sender As Object, _
ByVal e As DetailsViewDeletedEventArgs)
' Use the Exception property to determine whether an exception
' occurred during the delete operation.
If e.Exception Is Nothing Then
' Use the AffectedRows property to determine the numbers of
' rows affected by the delete operation.
If e.AffectedRows = 1 Then
MessageLabel.Text = e.AffectedRows.ToString() _
& " record deleted successfully."
Else
MessageLabel.Text = e.AffectedRows.ToString() _
& " records deleted successfully."
End If
Else
' Insert the code to handle the exception.
MessageLabel.Text = e.Exception.Message
' Use the ExceptionHandled property to indicate that the
' exception is already handled.
e.ExceptionHandled = True
End If
End Sub
</script>
<head runat="server">
<title>DetailsViewDeletedEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewDeletedEventHandler Example</h3>
<!-- Use a PlaceHolder control as the container for the -->
<!-- dynamically generated DetailsView control. -->
<asp:PlaceHolder id="DetailsViewPlaceHolder"
runat="server"/>
<br/><br/>
<asp:label id="MessageLabel"
forecolor="Red"
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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
deletecommand="Delete [Customers]
Where [CustomerID]=@CustomerID"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Aşağıdaki kod örneği, bir denetimin olayına DetailsView bildirimli olarak temsilci ItemDeleted eklemeyi DetailsViewDeletedEventHandler gösterir.
<%@ page language="C#"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server">
void CustomerDetailView_ItemDeleted(Object sender,
DetailsViewDeletedEventArgs e)
{
// Use the Exception property to determine whether an exception
// occurred during the delete operation.
if (e.Exception == null)
{
// Use the AffectedRows property to determine the numbers of
// rows affected by the delete operation.
if (e.AffectedRows == 1)
{
MessageLabel.Text = e.AffectedRows.ToString()
+ " record deleted successfully.";
}
else
{
MessageLabel.Text = e.AffectedRows.ToString()
+ " records deleted successfully.";
}
}
else
{
// Insert the code to handle the exception.
MessageLabel.Text = e.Exception.Message;
// Use the ExceptionHandled property to indicate that the
// exception is already handled.
e.ExceptionHandled = true;
}
}
</script>
<head runat="server">
<title>DetailsViewDeletedEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewDeletedEventHandler Example</h3>
<asp:detailsview id="CustomerDetailsView"
datasourceid="DetailsViewSource"
autogeneraterows="true"
autogeneratedeletebutton="true"
allowpaging="true"
datakeynames="CustomerID"
runat="server">
<pagersettings mode="NextPrevious"/>
</asp:detailsview>
<br/><br/>
<asp:label id="MessageLabel"
forecolor="Red"
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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
deletecommand="Delete [Customers]
Where [CustomerID]=@CustomerID"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server">
Sub CustomerDetailView_ItemDeleted(ByVal sender As Object, _
ByVal e As DetailsViewDeletedEventArgs)
' Use the Exception property to determine whether an exception
' occurred during the delete operation.
If e.Exception Is Nothing Then
' Use the AffectedRows property to determine the numbers of
' rows affected by the delete operation.
If e.AffectedRows = 1 Then
MessageLabel.Text = e.AffectedRows.ToString() _
& " record deleted successfully."
Else
MessageLabel.Text = e.AffectedRows.ToString() _
& " records deleted successfully."
End If
Else
' Insert the code to handle the exception.
MessageLabel.Text = e.Exception.Message
' Use the ExceptionHandled property to indicate that the
' exception is already handled.
e.ExceptionHandled = True
End If
End Sub
</script>
<head runat="server">
<title>DetailsViewDeletedEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewDeletedEventHandler Example</h3>
<asp:detailsview id="CustomerDetailsView"
datasourceid="DetailsViewSource"
autogeneraterows="true"
autogeneratedeletebutton="true"
allowpaging="true"
datakeynames="CustomerID"
runat="server">
<pagersettings mode="NextPrevious"/>
</asp:detailsview>
<br/><br/>
<asp:label id="MessageLabel"
forecolor="Red"
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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
deletecommand="Delete [Customers]
Where [CustomerID]=@CustomerID"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Açıklamalar
Denetim içindeki DetailsView bir Delete düğmesine (özelliği "Sil" olarak ayarlanmış bir düğmeCommandName) tıklandığında, ancak denetim kaydı sildikten sonra DetailsView olayı tetiklerItemDeleted. Bu, bu olay her gerçekleştiğinde silme işleminin sonuçlarını denetleme gibi özel bir yordam gerçekleştiren bir olay işleyicisi sağlamanıza olanak tanır.
Bir DetailsViewDeletedEventHandler temsilci oluşturduğunuzda, olayı işleyecek yöntemi tanımlarsınız. Olayı olay işleyicinizle ilişkilendirmek için olaya temsilcinin bir örneğini ekleyin. Olay her gerçekleştiğinde, olay işleyici (siz temsilciyi kaldırmadığınız sürece) çağrılır. Olay işleyici temsilcileri hakkında daha fazla bilgi için bkz. Olayları İşleme ve Oluşturma.
Uzantı Metotları
| GetMethodInfo(Delegate) |
Belirtilen temsilci tarafından temsil edilen yöntemi temsil eden bir nesnesi alır. |
Şunlara uygulanır
Ayrıca bkz.
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