ButtonType Enum
Definitie
Belangrijk
Bepaalde informatie heeft betrekking op een voorlopige productversie die aanzienlijk kan worden gewijzigd voordat deze wordt uitgebracht. Microsoft biedt geen enkele expliciete of impliciete garanties met betrekking tot de informatie die hier wordt verstrekt.
Hiermee geeft u de verschillende typen knoppen op die kunnen worden weergegeven op een webpagina met webformulieren.
public enum class ButtonTypepublic enum ButtonTypetype ButtonType = Public Enum ButtonType- Overname
Velden
| Name | Waarde | Description |
|---|---|---|
| Button | 0 | Een opdrachtknop. |
| Image | 1 | Een knop die een afbeelding weergeeft. |
| Link | 2 | Een hyperlinkstijlknop. |
Voorbeelden
In het volgende voorbeeld ziet u hoe u de ButtonType opsomming gebruikt om op te geven dat koppelingsknoppen worden weergegeven in een ButtonField veldkolom van een GridView besturingselement. De ButtonType eigenschap van een ButtonField object is declaratief ingesteld op ButtonType.Link.
<%@ 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 AuthorsGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
{
// If multiple ButtonField column fields are used, use the
// CommandName property to determine which button was clicked.
if(e.CommandName=="Select")
{
// Convert the row index stored in the CommandArgument
// property to an Integer.
int index = Convert.ToInt32(e.CommandArgument);
// Get the last name of the selected author from the appropriate
// cell in the GridView control.
GridViewRow selectedRow = AuthorsGridView.Rows[index];
TableCell lastNameCell = selectedRow.Cells[1];
string lastName = lastNameCell.Text;
// Display the selected author.
Message.Text = "You selected " + lastName + ".";
}
}
void AuthorsGridView_RowCreated(Object sender, GridViewRowEventArgs e)
{
// The GridViewCommandEventArgs class does not contain a
// property that indicates which row's command button was
// clicked. To identify which row contains the button
// clicked, use the button's CommandArgument property by
// setting it to the row's index.
if(e.Row.RowType == DataControlRowType.DataRow)
{
// Retrieve the button control from the first column.
// Because the ButtonType property of the column field
// is set to ButtonType.Link, the button control must be
// cast to a LinkButton. If you specify a different button
// type, you must cast the button control to the appropriate
// button type.
LinkButton selectButton = (LinkButton)e.Row.Cells[0].Controls[0];
// Set the LinkButton's CommandArgument property with the
// row's index.
selectButton.CommandArgument = e.Row.RowIndex.ToString();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ButtonType Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>ButtonType Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"
AssociatedControlID="AuthorsGridView"/>
<!-- Populate the Fields collection declaratively. -->
<asp:gridview id="AuthorsGridView"
datasourceid="AuthorsSqlDataSource"
autogeneratecolumns="false"
onrowcommand="AuthorsGridView_RowCommand"
runat="server">
<columns>
<asp:buttonfield buttontype="Link" commandname="Select" text="Select"/>
<asp:boundfield datafield="au_lname" headertext="au_lname"/>
<asp:boundfield datafield="au_fname" headertext="au_fname"/>
</columns>
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Pubs sample database. -->
<asp:sqldatasource id="AuthorsSqlDataSource"
selectcommand="SELECT [au_lname], [au_fname] FROM [authors]"
connectionstring="server=localhost;database=pubs;integrated security=SSPI"
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 AuthorsGridView_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)
' If multiple ButtonField column fields are used, use the
' CommandName property to determine which button was clicked.
If e.CommandName = "Select" Then
' Convert the row index stored in the CommandArgument
' property to an Integer.
Dim index As Integer = Convert.ToInt32(e.CommandArgument)
' Get the last name of the selected author from the appropriate
' cell in the GridView control.
Dim selectedRow As GridViewRow = AuthorsGridView.Rows(index)
Dim lastNameCell As TableCell = selectedRow.Cells(1)
Dim lastName As String = lastNameCell.Text
' Display the selected author.
Message.Text = "You selected " & lastName & "."
End If
End Sub
Sub AuthorsGridView_RowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
' The GridViewCommandEventArgs class does not contain a
' property that indicates which row's command button was
' clicked. To identify which row contains the button
' clicked, use the button's CommandArgument property by
' setting it to the row's index.
If e.Row.RowType = DataControlRowType.DataRow Then
' Retrieve the button control from the first column.
' Because the ButtonType property of the column field
' is set to ButtonType.Link, the button control must be
' cast to a LinkButton. If you specify a different button
' type, you must cast the button control to the appropriate
' button type.
Dim selectButton As LinkButton = CType(e.Row.Cells(0).Controls(0), LinkButton)
' Set the LinkButton's CommandArgument property with the
' row's index.
selectButton.CommandArgument = e.Row.RowIndex.ToString()
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ButtonType Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>ButtonType Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"
AssociatedControlID="AuthorsGridView"/>
<!-- Populate the Columns collection declaratively. -->
<asp:gridview id="AuthorsGridView"
datasourceid="AuthorsSqlDataSource"
autogeneratecolumns="false"
onrowcommand="AuthorsGridView_RowCommand"
runat="server">
<columns>
<asp:buttonfield buttontype="Link" commandname="Select" text="Select"/>
<asp:boundfield datafield="au_lname" headertext="au_lname"/>
<asp:boundfield datafield="au_fname" headertext="au_fname"/>
</columns>
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Pubs sample database. -->
<asp:sqldatasource id="AuthorsSqlDataSource"
selectcommand="SELECT [au_lname], [au_fname] FROM [authors]"
connectionstring="server=localhost;database=pubs;integrated security=SSPI"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
Opmerkingen
De opsomming ButtonType wordt gebruikt om de verschillende typen knoppen weer te geven (zoals opdrachtknop, afbeeldingsknop, koppelingsknop, enzovoort) die op een ASP.NET pagina kunnen worden weergegeven. Het wordt vaak gebruikt door eigenschappen zoals de ButtonType eigenschap van de ButtonFieldBase klasse om aan te geven welk knoptype wordt gebruikt door het bovenliggende besturingselement.
