ButtonType Výčet
Definice
Důležité
Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.
Určuje různé typy tlačítek, které lze vykreslit na Web Forms stránce.
public enum class ButtonTypepublic enum ButtonTypetype ButtonType = Public Enum ButtonType- Dědičnost
Pole
| Button | 0 | Příkazové tlačítko. |
| Image | 1 | Tlačítko, které zobrazuje obrázek. |
| Link | 2 | Tlačítko stylu hypertextového odkazu |
Příklady
Následující příklad ukazuje, jak pomocí výčtu ButtonType určit, že tlačítka propojení se zobrazí ve ButtonField sloupci GridView pole ovládacího prvku. Vlastnost ButtonType objektu ButtonField je deklarativní nastavena na 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>
Poznámky
Výčet ButtonType se používá k reprezentaci různých typů tlačítek (například příkazové tlačítko, tlačítko obrázku, tlačítko odkazu atd.), které lze vykreslit na ASP.NET stránce. Běžně se používá vlastnostmi, jako ButtonType je vlastnost ButtonFieldBase třídy k označení typu tlačítka, který je používán nadřazeným ovládacím prvku.