FormViewDeletedEventArgs.AffectedRows Properti
Definisi
Penting
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Mendapatkan jumlah baris yang terpengaruh oleh operasi penghapusan.
public:
property int AffectedRows { int get(); };
public int AffectedRows { get; }
member this.AffectedRows : int
Public ReadOnly Property AffectedRows As Integer
Nilai Properti
Jumlah baris yang dipengaruhi oleh operasi penghapusan.
Contoh
Contoh berikut menunjukkan cara menggunakan AffectedRows properti untuk memverifikasi bahwa rekaman telah dihapus selama operasi penghapusan.
<%@ 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 EmployeeFormView_ItemDeleted(Object sender, FormViewDeletedEventArgs 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 whether the
// record was deleted. Sometimes an error might occur that
// does not raise an exception, but prevents the delete
// operation from completing.
if (e.AffectedRows == 1)
{
MessageLabel.Text = "Record deleted successfully.";
}
else
{
MessageLabel.Text = "An error occurred during the delete operation.";
}
}
else
{
// Insert the code to handle the exception.
MessageLabel.Text = e.Exception.Message;
// Use the ExceptionHandled property to indicate that the
// exception has already been handled.
e.ExceptionHandled = true;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>FormViewDeletedEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormViewDeletedEventArgs Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
onitemdeleted="EmployeeFormView_ItemDeleted"
runat="server">
<itemtemplate>
<table>
<tr>
<td>
<asp:image id="EmployeeImage"
imageurl='<%# Eval("PhotoPath") %>'
alternatetext='<%# Eval("LastName") %>'
runat="server"/>
</td>
<td>
<h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3>
<%# Eval("Title") %>
</td>
</tr>
<tr>
<td colspan="2">
<asp:button id="DeleteButton"
text="Delete Record"
commandname="Delete"
runat="server" />
</td>
</tr>
</table>
</itemtemplate>
</asp:formview>
<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="EmployeeSource"
selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
deletecommand="Delete [Employees] Where [EmployeeID]=@EmployeeID"
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">
<script runat="server">
Sub EmployeeFormView_ItemDeleted(ByVal sender As Object, ByVal e As FormViewDeletedEventArgs) Handles EmployeeFormView.ItemDeleted
' 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 whether the
' record was deleted. Sometimes an error might occur that
' does not raise an exception, but prevents the delete
' operation from completing.
If e.AffectedRows = 1 Then
MessageLabel.Text = "Record deleted successfully."
Else
MessageLabel.Text = "An error occurred during the delete operation."
End If
Else
' Insert the code to handle the exception.
MessageLabel.Text = e.Exception.Message
' Use the ExceptionHandled property to indicate that the
' exception has already been handled.
e.ExceptionHandled = True
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>FormViewDeletedEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormViewDeletedEventArgs Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
runat="server">
<itemtemplate>
<table>
<tr>
<td>
<asp:image id="EmployeeImage"
imageurl='<%# Eval("PhotoPath") %>'
alternatetext='<%# Eval("LastName") %>'
runat="server"/>
</td>
<td>
<h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3>
<%# Eval("Title") %>
</td>
</tr>
<tr>
<td colspan="2">
<asp:button id="DeleteButton"
text="Delete Record"
commandname="Delete"
runat="server" />
</td>
</tr>
</table>
</itemtemplate>
</asp:formview>
<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="EmployeeSource"
selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
deletecommand="Delete [Employees] Where [EmployeeID]=@EmployeeID"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Keterangan
AffectedRows Gunakan properti untuk menentukan jumlah rekaman yang terpengaruh oleh operasi penghapusan. Properti ini biasanya digunakan untuk memverifikasi bahwa jumlah rekaman yang benar telah dihapus dalam situasi berikut:
Verifikasi bahwa hanya satu rekaman yang dihapus. Terkadang pernyataan penghapusan yang tidak ditulis secara tidak benar dapat menghapus beberapa rekaman.
Verifikasi bahwa rekaman dihapus ketika kesalahan terjadi selama operasi penghapusan yang tidak menimbulkan pengecualian.
Verifikasi bahwa rekaman dihapus saat kontrol sumber data yang mendukung deteksi konflik (konkurensi optimis), seperti SqlDataSource kontrol dan ObjectDataSource , propertinya ConflictDetection diatur ke
ConflictOptions.CompareAllValues
nilai enumerasi. Di bawah pengaturan ini, rekaman yang telah dimodifikasi oleh pengguna lain secara bersamaan mungkin tidak dihapus.
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