DataList.CreateControlStyle Método

Referencia

Definición

Espacio de nombres:: System.Web.UI.WebControls

Ensamblado:: System.Web.dll

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.

Crea el objeto de estilo predeterminado utilizado internamente por el control DataList para implementar todas las propiedades relacionadas con el estilo.

protected:
 override System::Web::UI::WebControls::Style ^ CreateControlStyle();

protected override System.Web.UI.WebControls.Style CreateControlStyle ();

override this.CreateControlStyle : unit -> System.Web.UI.WebControls.Style

Protected Overrides Function CreateControlStyle () As Style

Devoluciones

Style

Objeto TableStyle que contiene las propiedades de estilo predeterminadas para el control.

Ejemplos

En el ejemplo de código siguiente se muestra cómo invalidar el CreateControlStyle método en un control de servidor personalizado para que siempre muestre líneas de cuadrícula horizontales sin espacio de celda en el DataList control.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page language="c#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom DataList - CreateControlStyle - C# Example</title>
    <script runat="server">
      private void Page_Load(object sender, System.EventArgs e)
      {
        // Create sample data for the DataList control.
        System.Data.DataTable dt = new System.Data.DataTable();
        System.Data.DataRow dr;
        dt.Columns.Add(new System.Data.DataColumn("Column1", typeof(String)));

        dr = dt.NewRow();
        dr[0] = "Hello";
        dt.Rows.Add(dr);

        dr = dt.NewRow();
        dr[0] = "DataList";
        dt.Rows.Add(dr);

        dr = dt.NewRow();
        dr[0] = "World";
        dt.Rows.Add(dr);

        // Show the DataTable values in the DataList.
        DataList1.DataSource = dt;
        DataList1.DataBind();
    }
    </script>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom DataList - CreateControlStyle - C# Example</h3>

      <aspSample:CustomDataListCreateControlStyle id="DataList1" runat="server" BorderColor="#999999" BorderStyle="None" BackColor="White" CellPadding="3" GridLines="Vertical" BorderWidth="1px" Width="100px">

        <HeaderStyle Font-Bold="True" ForeColor="White" BackColor="#000084" />
        <HeaderTemplate>
          <asp:Label id="Label1" runat="server">Column1</asp:Label>
        </HeaderTemplate>

        <ItemStyle ForeColor="Black" BackColor="#EEEEEE" />
        <ItemTemplate>
          <asp:Label id="Label2" runat="server"><%# DataBinder.Eval(Container.DataItem, "Column1") %></asp:Label>
        </ItemTemplate>

        <AlternatingItemStyle BackColor="#DCDCDC" />
        <AlternatingItemTemplate>
          <asp:Label id="Label3" runat="server"><%# DataBinder.Eval(Container.DataItem, "Column1") %></asp:Label>
        </AlternatingItemTemplate>

      </aspSample:CustomDataListCreateControlStyle>

    </form>
  </body>
</html>

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<%@ Page language="vb" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom DataList - CreateControlStyle - VB Example</title>
    <script runat="server">
      Private Sub Page_Load(sender As Object, e As EventArgs)

        ' Create sample data for the DataList control.
        Dim dt As System.Data.DataTable = New System.Data.DataTable()
        Dim dr As System.Data.DataRow

        ' Create a new column named Column1, of type String.
        Dim col As New System.Data.DataColumn("Column1", GetType(String))
        ' Add the column to the DataTable.
        dt.Columns.Add(col)

        dr = dt.NewRow()
        dr(0) = "Hello"
        dt.Rows.Add(dr)

        dr = dt.NewRow()
        dr(0) = "DataList"
        dt.Rows.Add(dr)

        dr = dt.NewRow()
        dr(0) = "World"
        dt.Rows.Add(dr)

        ' Show the DataTable values in the DataList.
        DataList1.DataSource = dt
        DataList1.DataBind()

      End Sub ' Page_Load
    </script>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom DataList - CreateControlStyle - VB Example</h3>

      <aspSample:CustomDataListCreateControlStyle id="DataList1" runat="server" BorderColor="#999999" BorderStyle="None" BackColor="White" CellPadding="3" GridLines="Vertical" BorderWidth="1px" Width="100px">

        <HeaderStyle Font-Bold="True" ForeColor="White" BackColor="#000084" />
        <HeaderTemplate>
          <asp:Label id="Label1" runat="server">Column1</asp:Label>
        </HeaderTemplate>

        <ItemStyle ForeColor="Black" BackColor="#EEEEEE" />
        <ItemTemplate>
          <asp:Label id="Label2" runat="server"><%# DataBinder.Eval(Container.DataItem, "Column1") %></asp:Label>
        </ItemTemplate>

        <AlternatingItemStyle BackColor="#DCDCDC" />
        <AlternatingItemTemplate>
          <asp:Label id="Label3" runat="server"><%# DataBinder.Eval(Container.DataItem, "Column1") %></asp:Label>
        </AlternatingItemTemplate>

      </aspSample:CustomDataListCreateControlStyle>

    </form>
  </body>
</html>

using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomDataListCreateControlStyle : System.Web.UI.WebControls.DataList
    {
        protected override System.Web.UI.WebControls.Style CreateControlStyle()
        {
            // Create a new TableStyle instance based on ViewState values.
            System.Web.UI.WebControls.TableStyle style = new System.Web.UI.WebControls.TableStyle(ViewState);
            
            // Show the GridLines horizontal with no CellSpacing.
            style.GridLines = System.Web.UI.WebControls.GridLines.Horizontal;
            style.CellSpacing = 0;

            // Return the Style
            return style;
        }
    }
}

Imports System.Web
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls
    <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public NotInheritable Class CustomDataListCreateControlStyle
        Inherits System.Web.UI.WebControls.DataList

        Protected Overrides Function CreateControlStyle() As System.Web.UI.WebControls.Style

            ' Create a new TableStyle instance based on ViewState values.
            Dim style As New System.Web.UI.WebControls.TableStyle(ViewState)

            ' Show the GridLines horizontal with no CellSpacing.
            style.GridLines = System.Web.UI.WebControls.GridLines.Horizontal
            style.CellSpacing = 0

            ' Return the Style
            Return style
        End Function
    End Class
End Namespace

Comentarios

El CreateControlStyle método se usa principalmente por los desarrolladores de controles en la derivación de una implementación personalizada del DataList control .

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