DataControlRowType Enumeración
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Especifica la función de una fila en un control de datos, como un control DetailsView o GridView.
public enum class DataControlRowTypepublic enum DataControlRowTypetype DataControlRowType = Public Enum DataControlRowType- Herencia
Campos
| DataRow | 2 | Una fila de datos de un control de datos. Solamente se pueden enlazar a datos las filas DataRow. |
| EmptyDataRow | 5 | Fila vacía de un control enlazado a datos. Se muestra la fila vacía cuando el control enlazado a datos no tiene registros para mostrar y la plantilla |
| Footer | 1 | Una fila de pie de página de un control de datos. No se pueden enlazar a datos las filas de pie de página. |
| Header | 0 | Una fila de encabezado de un control de datos. No se pueden enlazar a datos las filas de encabezado. |
| Pager | 4 | Fila que muestra botones de paginación o un control de paginación. No se pueden enlazar a datos las filas del elemento de paginación. |
| Separator | 3 | Un separador de fila. No se pueden enlazar a datos los separadores de fila. |
Ejemplos
En el ejemplo de código siguiente se muestra cómo usar la DataControlRowType enumeración para comprobar el tipo de una fila al trabajar con un GridView control . El AuthorsGridView_RowCreated método garantiza que la CommandArgument propiedad de un LinkButton control sea única para todas las filas de datos del GridView control, de modo que, cuando se haga clic en el control de una fila LinkButton , se pueda identificar correctamente.
<%@ 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>
Comentarios
La DataControlRowType enumeración identifica la función de las filas de un control de datos. Los controles y GridView los usan DetailsView para distinguir entre filas que muestran datos y filas que muestran otros elementos de la interfaz de usuario (UI), como una fila de encabezado, un separador de filas o botones de buscapersonas.
Puede usar la DataControlRowType enumeración para identificar el tipo de un GridViewRow objeto o DetailsViewRow al enumerar a través de una GridViewRowCollection colección o DetailsViewRowCollection . Si va a escribir un control de datos que crea filas, puede usar la DataControlRowType enumeración para identificar la función de filas diferentes en el control.