DataControlRowType Enumeration
Definition
Wichtig
Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.
Gibt die Funktion einer Zeile in einem Datensteuerelement an, z. B. als DetailsView-Steuerelement oder GridView-Steuerelement.
public enum class DataControlRowTypepublic enum DataControlRowTypetype DataControlRowType = Public Enum DataControlRowType- Vererbung
Felder
| DataRow | 2 | Eine Datenzeile eines Datensteuerelements. Nur DataRow-Zeilen können datengebunden sein. |
| EmptyDataRow | 5 | Die leere Zeile eines datengebundenen Steuerelements. Die leere Datenzeile wird angezeigt, wenn im datengebundenen Steuerelement keine anzuzeigenden Datensätze vorhanden sind und die |
| Footer | 1 | Eine Fußzeile eines Datensteuerelements. Fußzeilen können nicht datengebunden sein. |
| Header | 0 | Ein Header eines Datensteuerelements. Header können nicht datengebunden sein. |
| Pager | 4 | Eine Zeile, in der Pager-Schaltflächen oder ein Pager-Steuerelement angezeigt werden. Pagerzeilen können nicht datengebunden sein. |
| Separator | 3 | Ein Zeilentrennzeichen. Zeilentrennzeichen können nicht datengebunden sein. |
Beispiele
Im folgenden Codebeispiel wird veranschaulicht, wie die DataControlRowType Aufzählung zum Überprüfen des Typs einer Zeile beim Arbeiten mit einem GridView Steuerelement verwendet wird. Die AuthorsGridView_RowCreated Methode stellt sicher, dass die CommandArgument Eigenschaft eines Steuerelements für alle Datenzeilen im GridView Steuerelement eindeutig ist, sodass beim Klicken auf das Steuerelement einer LinkButton Zeile LinkButton richtig identifiziert werden kann.
<%@ 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 object.
GridView customersGridView = new GridView();
// Set the GridView object's properties.
customersGridView.ID = "CustomersGridView";
customersGridView.DataSourceID = "CustomersSource";
customersGridView.AutoGenerateColumns = false;
// Dynamically create the columns for the GridView control.
ButtonField addColumn = new ButtonField();
addColumn.CommandName = "Add";
addColumn.Text = "Add";
addColumn.ButtonType = ButtonType.Link;
BoundField companyNameColumn = new BoundField();
companyNameColumn.DataField = "CompanyName";
companyNameColumn.HeaderText = "Company Name";
BoundField cityColumn = new BoundField();
cityColumn.DataField = "City";
cityColumn.HeaderText = "City";
// Add the columns to the Columns collection
// of the GridView control.
customersGridView.Columns.Add(addColumn);
customersGridView.Columns.Add(companyNameColumn);
customersGridView.Columns.Add(cityColumn);
// Programmatically register the event handling methods.
customersGridView.RowCommand += new GridViewCommandEventHandler(this.CustomersGridView_RowCommand);
customersGridView.RowCreated += new GridViewRowEventHandler(this.CustomersGridView_RowCreated);
// Add the GridView object to the Controls collection
// of the PlaceHolder control.
GridViewPlaceHolder.Controls.Add(customersGridView);
}
void CustomersGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
{
// If multiple ButtonField columns are used, use the
// CommandName property to determine which button was clicked.
if(e.CommandName=="Add")
{
// Convert the row index stored in the CommandArgument
// property to an Integer.
int index = Convert.ToInt32(e.CommandArgument);
// Retrieve the row that contains the button clicked
// by the user from the Rows collection. Use the
// CommandSource property to access the GridView control.
GridView customersGridView = (GridView)e.CommandSource;
GridViewRow row = customersGridView.Rows[index];
// Create a new ListItem object for the customer in the row.
ListItem item = new ListItem();
item.Text = Server.HtmlDecode(row.Cells[1].Text) + " " + Server.HtmlDecode(row.Cells[2].Text);
// If the author is not already in the ListBox, add the ListItem
// object to the Items collection of a ListBox control.
if(!CustomersListBox.Items.Contains(item))
{
CustomersListBox.Items.Add(item);
}
}
}
void CustomersGridView_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 was clicked, use the button's
// CommandArgument property by setting it to the row's index.
if(e.Row.RowType == DataControlRowType.DataRow)
{
// Retrieve the LinkButton control from the first column.
LinkButton addButton = (LinkButton)e.Row.Cells[0].Controls[0];
// Set the LinkButton's CommandArgument property with the
// row's index.
addButton.CommandArgument = e.Row.RowIndex.ToString();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewCommandEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewCommandEventArgs Example</h3>
<table width="100%">
<tr>
<td style="width:50%">
<asp:placeholder id="GridViewPlaceHolder"
runat="Server"/>
</td>
<td style="vertical-align:top; width:50%">
Customers: <br/>
<asp:listbox id="CustomersListBox"
runat="server"/>
</td>
</tr>
</table>
<!-- 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="CustomersSource"
selectcommand="Select [CustomerID], [CompanyName], [City] From [Customers]"
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 Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Create a new GridView object.
Dim customersGridView As New GridView()
' Set the GridView object's properties.
customersGridView.ID = "CustomersGridView"
customersGridView.DataSourceID = "CustomersSource"
customersGridView.AutoGenerateColumns = False
' Dynamically create the columns for the GridView control.
Dim addColumn As New ButtonField()
addColumn.CommandName = "Add"
addColumn.Text = "Add"
addColumn.ButtonType = ButtonType.Link
Dim companyNameColumn As New BoundField()
companyNameColumn.DataField = "CompanyName"
companyNameColumn.HeaderText = "Company Name"
Dim cityColumn As New BoundField()
cityColumn.DataField = "City"
cityColumn.HeaderText = "City"
' Add the columns to the Columns collection
' of the GridView control.
customersGridView.Columns.Add(addColumn)
customersGridView.Columns.Add(companyNameColumn)
customersGridView.Columns.Add(cityColumn)
' Programmatically register the event handling methods.
AddHandler customersGridView.RowCommand, AddressOf CustomersGridView_RowCommand
AddHandler customersGridView.RowCreated, AddressOf CustomersGridView_RowCreated
' Add the GridView object to the Controls collection
' of the PlaceHolder control.
GridViewPlaceHolder.Controls.Add(customersGridView)
End Sub
Sub CustomersGridView_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)
' If multiple ButtonField columns are used, use the
' CommandName property to determine which button was clicked.
If e.CommandName = "Add" Then
' Convert the row index stored in the CommandArgument
' property to an Integer.
Dim index As Integer = Convert.ToInt32(e.CommandArgument)
' Retrieve the row that contains the button clicked
' by the user from the Rows collection. Use the
' CommandSource property to access the GridView control.
Dim customersGridView As GridView = CType(e.CommandSource, GridView)
Dim row As GridViewRow = customersGridView.Rows(index)
' Create a new ListItem object for the customer in the row.
Dim item As New ListItem()
item.Text = Server.HtmlDecode(row.Cells(1).Text) + " " + Server.HtmlDecode(row.Cells(2).Text)
' If the author is not already in the ListBox, add the ListItem
' object to the Items collection of a ListBox control.
If Not CustomersListBox.Items.Contains(item) Then
CustomersListBox.Items.Add(item)
End If
End If
End Sub
Sub CustomersGridView_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 was clicked, use the button's
' CommandArgument property by setting it to the row's index.
If e.Row.RowType = DataControlRowType.DataRow Then
' Retrieve the LinkButton control from the first column.
Dim addButton As LinkButton = CType(e.Row.Cells(0).Controls(0), LinkButton)
' Set the LinkButton's CommandArgument property with the
' row's index.
addButton.CommandArgument = e.Row.RowIndex.ToString()
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewCommandEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewCommandEventArgs Example</h3>
<table width="100%">
<tr>
<td style="width:50%">
<asp:placeholder id="GridViewPlaceHolder"
runat="Server"/>
</td>
<td style="vertical-align:top; width:50%">
Customers: <br/>
<asp:listbox id="CustomersListBox"
runat="server"/>
</td>
</tr>
</table>
<!-- 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="CustomersSource"
selectcommand="Select [CustomerID], [CompanyName], [City] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Hinweise
Die DataControlRowType Aufzählung identifiziert die Funktion von Zeilen in einem Datensteuerelement. Es wird von den DetailsView Steuerelementen GridView verwendet, um zwischen Zeilen zu unterscheiden, die Daten und Zeilen anzeigen, die andere Benutzeroberflächenelemente (Benutzeroberfläche) anzeigen, z. B. eine Kopfzeile, Zeilentrennzeichen oder Pagerschaltflächen.
Sie können die DataControlRowType Aufzählung verwenden, um den Typ eines GridViewRow Oder DetailsViewRow Objekts zu identifizieren, wenn Sie eine GridViewRowCollection DetailsViewRowCollection oder eine Auflistung aufzählen. Wenn Sie ein Datensteuerelement schreiben, das Zeilen erstellt, können Sie die Enumeration verwenden, um die DataControlRowType Funktion verschiedener Zeilen im Steuerelement zu identifizieren.