GridViewEditEventHandler Gedelegeerde
Definitie
Belangrijk
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Vertegenwoordigt de methode die de RowEditing gebeurtenis van een GridView besturingselement afhandelt.
public delegate void GridViewEditEventHandler(System::Object ^ sender, GridViewEditEventArgs ^ e);public delegate void GridViewEditEventHandler(object sender, GridViewEditEventArgs e);type GridViewEditEventHandler = delegate of obj * GridViewEditEventArgs -> unitPublic Delegate Sub GridViewEditEventHandler(sender As Object, e As GridViewEditEventArgs)Parameters
- sender
- Object
De bron van de gebeurtenis.
Een GridViewEditEventArgs object dat de gebeurtenisgegevens bevat.
Voorbeelden
In het volgende voorbeeld ziet u hoe u programmatisch een GridViewEditEventHandler gemachtigde toevoegt aan de RowEditing gebeurtenis van een GridView besturingselement.
<%@ 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.AutoGenerateEditButton = true;
customersGridView.AllowPaging = true;
customersGridView.DataKeyNames = new String[] { "CustomerID" };
// Programmatically register the event-handling method.
customersGridView.RowEditing += new GridViewEditEventHandler(this.CustomersGridView_RowEditing);
// Add the GridView control to the Controls collection
// of the PlaceHolder control.
GridViewPlaceHolder.Controls.Add(customersGridView);
}
void CustomersGridView_RowEditing(Object sender, GridViewEditEventArgs e)
{
// User the sender parameter to retrieve the GridView control
// that raised the event.
GridView customersGridView = (GridView)sender;
// Get the country for the row being edited. For this example, the
// country is contained in the seventh column (index 6).
String country = customersGridView.Rows[e.NewEditIndex].Cells[6].Text;
// For this example, cancel the edit operation if the user attempts
// to edit the record of a customer from the USA.
if (country == "USA")
{
// Cancel the edit operation.
e.Cancel = true;
Message.Text = "You cannot edit this record.";
}
else
{
Message.Text = "";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewEditEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewEditEventHandler 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]"
updatecommand="Update Customers SET CompanyName=@CompanyName, Address=@Address, City=@City, PostalCode=@PostalCode, Country=@Country 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.AutoGenerateEditButton = True
customersGridView.AllowPaging = True
Dim keyArray() As String = {"CustomerID"}
customersGridView.DataKeyNames = keyArray
' Programmatically register the event-handling method.
AddHandler customersGridView.RowEditing, AddressOf CustomersGridView_RowEditing
' Add the GridView control to the Controls collection
' of the PlaceHolder control.
GridViewPlaceHolder.Controls.Add(customersGridView)
End Sub
Sub CustomersGridView_RowEditing(ByVal sender As Object, ByVal e As GridViewEditEventArgs)
' User the sender parameter to retrieve the GridView control
' that raised the event.
Dim customersGridView As GridView = CType(sender, GridView)
' Get the country for the row being edited. For this example, the
' country is contained in the seventh column (index 6).
Dim country As String = customersGridView.Rows(e.NewEditIndex).Cells(6).Text
' For this example, cancel the edit operation if the user attempts
' to edit the record of a customer from the USA.
If country = "USA" Then
' Cancel the edit operation.
e.Cancel = True
Message.Text = "You cannot edit this record."
Else
Message.Text = ""
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewEditEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewEditEventHandler 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]"
updatecommand="Update Customers SET CompanyName=@CompanyName, Address=@Address, City=@City, PostalCode=@PostalCode, Country=@Country WHERE (CustomerID = @CustomerID)"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
In het volgende voorbeeld ziet u hoe u declaratief een GridViewEditEventHandler gedelegeerde toevoegt aan de RowEditing gebeurtenis van een GridView besturingselement.
<%@ 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_RowEditing(Object sender, GridViewEditEventArgs e)
{
// Get the country for the row being edited. For this example, the
// country is contained in the seventh column (index 6).
String country = CustomersGridView.Rows[e.NewEditIndex].Cells[6].Text;
// For this example, cancel the edit operation if the user attempts
// to edit the record of a customer from the Unites States.
if (country == "USA")
{
// Cancel the edit operation.
e.Cancel = true;
Message.Text = "You cannot edit this record.";
}
else
{
Message.Text = "";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView RowEditing Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView RowEditing 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"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="true"
autogenerateeditbutton="true"
allowpaging="true"
datakeynames="CustomerID"
onrowediting="CustomersGridView_RowEditing"
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)"
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_RowEditing(ByVal sender As Object, ByVal e As GridViewEditEventArgs)
' Get the country for the row being edited. For this example, the
' country is contained in the seventh column (index 6).
Dim country As String = CustomersGridView.Rows(e.NewEditIndex).Cells(6).Text
' For this example, cancel the edit operation if the user attempts
' to edit the record of a customer from the United States.
If country = "USA" Then
' Cancel the edit operation.
e.Cancel = True
Message.Text = "You cannot edit this record."
Else
Message.Text = ""
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView RowEditing Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView RowEditing 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"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="true"
autogenerateeditbutton="true"
allowpaging="true"
datakeynames="CustomerID"
onrowediting="CustomersGridView_RowEditing"
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)"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
Opmerkingen
De RowEditing gebeurtenis wordt gegenereerd wanneer op een knop Bewerken (een knop met CommandName de eigenschap 'Bewerken' is ingesteld) wordt geklikt, maar voordat het GridView besturingselement de bewerkingsmodus opent. Hiermee kunt u een methode voor gebeurtenisafhandeling opgeven waarmee een aangepaste routine wordt uitgevoerd, zoals het annuleren van de bewerking, wanneer deze gebeurtenis plaatsvindt.
Wanneer u een GridViewEditEventHandler gemachtigde maakt, identificeert u de methode die de gebeurtenis verwerkt. Als u de gebeurtenis wilt koppelen aan uw gebeurtenis-handler, voegt u een exemplaar van de gemachtigde toe aan de gebeurtenis. De gebeurtenis-handler wordt aangeroepen wanneer de gebeurtenis plaatsvindt, tenzij u de gemachtigde verwijdert. Zie Afhandeling en het genereren van gebeurtenissen voor meer informatie over gedelegeerden voor gebeurtenissen.
Extensiemethoden
| Name | Description |
|---|---|
| GetMethodInfo(Delegate) |
Hiermee haalt u een object op dat de methode vertegenwoordigt die wordt vertegenwoordigd door de opgegeven gemachtigde. |