DataList.CreateControlStyle Method

Reference

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Creates the default style object that is used internally by the DataList control to implement all style related properties.

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

Returns

Style

A TableStyle that contains the default style properties for the control.

Examples

The following code example demonstrates how to override the CreateControlStyle method in a custom server control so that it always displays horizontal grid lines with no cell spacing in the 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

Remarks

The CreateControlStyle method is used primarily by control developers in deriving a custom implementation from the DataList control.

Applies to

Dela via