BaseDataList.DataMember Eigenschaft

Definition

Ruft in einer Datenquelle mit mehreren Membern einen bestimmten Datenmember ab, der an ein Datenauflistungssteuerelement gebunden werden soll, oder legt diesen fest.Gets or sets the specific data member in a multimember data source to bind to a data listing control.

public:
 property System::String ^ DataMember { System::String ^ get(); void set(System::String ^ value); };
public string DataMember { get; set; }
[System.Web.UI.Themeable(false)]
public string DataMember { get; set; }
member this.DataMember : string with get, set
[<System.Web.UI.Themeable(false)>]
member this.DataMember : string with get, set
Public Property DataMember As String

Eigenschaftswert

String

Ein Datenmember aus einer Datenquelle mit mehreren Membern.A data member from a multimember data source. Der Standardwert ist Empty.The default value is Empty.

Attribute

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die-Eigenschaft verwendet wird DataMember , um anzugeben, welche Tabelle in einem- DataSet Objekt an ein-Steuerelement gebunden werden soll DataGrid .The following code example demonstrates how to use the DataMember property to specify which table in a DataSet object to bind to a DataGrid control.


<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace = "System.Data"  %>

<!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 runat="server">
    <title> BaseDataList DataMember Example </title>
<script runat="server">

      // Create sample data for the DataGrid control with two tables, 
      // Employee and Customer.
      DataSet CreateDataSet()
      {
    
         // Create a table to store employee values.
         DataTable EmployeeTable = new DataTable("Employee");
         DataRow TempDataRow;
   
         // Define the columns for the Employee table.
         EmployeeTable.Columns.Add(
            new DataColumn("EmployeeName", typeof(string)));
         EmployeeTable.Columns.Add(
            new DataColumn("EmployeeID", typeof(int)));

         // Populate the Employee table.
         for (int i=1; i<=5; i++) 
         {
            TempDataRow = EmployeeTable.NewRow();
            TempDataRow[0] = "Employee " + i.ToString();
            TempDataRow[1] = (i+1700);

            EmployeeTable.Rows.Add(TempDataRow);
         }

         // Create a table to store customer values.
         DataTable CustomerTable = new DataTable("Customer");

         // Define the columns for the Customer table.
         CustomerTable.Columns.Add(
            new DataColumn("CustomerName", typeof(string)));
         CustomerTable.Columns.Add(
            new DataColumn("CustomerID", typeof(int)));

         // Populate the Customer table.
         for (int i=1; i<=5; i++) 
         {
            TempDataRow = CustomerTable.NewRow();
            TempDataRow[0] = "Customer " + i.ToString();
            TempDataRow[1] = (i+1700);

            CustomerTable.Rows.Add(TempDataRow);
         }

         // Create a DataSet and add the Employee and Customer tables.
         DataSet ds = new DataSet();
         ds.Tables.Add(EmployeeTable);
         ds.Tables.Add(CustomerTable);

         return ds;

      }
             
      void Page_Load(Object sender, EventArgs e) 
      {

         // The data source only needs to be bound to the DataList  
         // control the first time the page is accessed.    
         if(!IsPostBack)
         {

            // Create the sample data for the DataList control.
            ItemsGrid.DataSource = CreateDataSet();

            // The data source in this example contains multiple tables. 
            // Specify which table to display in the DataList control. 
            ItemsGrid.DataMember = "Customer";

            // Bind the data source to the control.
            ItemsGrid.DataBind();

         }

      }

      void Index_Change(Object sender, EventArgs e) 
      {

         // Create the sample data for the DataList control.
         ItemsGrid.DataSource = CreateDataSet();

         // The data source in this example contains multiple tables. 
         // Specify which table to display in the DataList control 
         // based on the user's selection from the DropDownList control. 
         ItemsGrid.DataMember = SourceList.SelectedItem.Text;

         // Bind the data source to the control. 
         ItemsGrid.DataBind();

      }

   </script>

</head>
<body>

   <form id="form1" runat="server">

      <h3> BaseDataList DataMember Example </h3>
      
      <asp:DataGrid id="ItemsGrid"
           AutoGenerateColumns="True" 
           runat="server">

         <headerstyle backcolor="#00aaaa"/>
</asp:DataGrid>

      <br /><br />

      Select the data source: <br />

      <asp:DropDownList id="SourceList"
           AutoPostBack="True"
           OnSelectedIndexChanged="Index_Change"
           runat="server">

         <asp:Listitem Selected="True">Customer</asp:Listitem>
         <asp:Listitem>Employee</asp:Listitem>

      </asp:DropDownList>

   </form>
 
</body>

</html>


<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace = "System.Data"  %>

<!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 runat="server">
    <title> BaseDataList DataMember Example </title>
<script runat="server">

      ' Create sample data for the DataGrid control with two tables,
      ' Employee and Customer.
      Function CreateDataSet() As DataSet
    
         ' Create a table to store employee values.
         Dim EmployeeTable As DataTable = New DataTable("Employee")
         Dim TempDataRow As DataRow
   
         ' Define the columns for the Employee table.
         EmployeeTable.Columns.Add( _
            New DataColumn("EmployeeName", GetType(String)))
         EmployeeTable.Columns.Add( _
            New DataColumn("EmployeeID", GetType(Integer)))

         ' Populate the Employee table.
         Dim i As Integer

         For i=1 To 5 
         
            TempDataRow = EmployeeTable.NewRow()
            TempDataRow(0) = "Employee " & i.ToString()
            TempDataRow(1) = (i+1700)

            EmployeeTable.Rows.Add(TempDataRow)

         Next

         ' Create a table to store customer values.
         Dim CustomerTable As DataTable = New DataTable("Customer")

         ' Define the columns for the Customer table.
         CustomerTable.Columns.Add( _
            New DataColumn("CustomerName", GetType(String)))
         CustomerTable.Columns.Add( _
            New DataColumn("CustomerID", GetType(Integer)))

         ' Populate the Customer table.
         For i=1 To 5  

            TempDataRow = CustomerTable.NewRow()
            TempDataRow(0) = "Customer " & i.ToString()
            TempDataRow(1) = (i+1700)

            CustomerTable.Rows.Add(TempDataRow)
         
         Next

         ' Create a DataSet and add the Employee and Customer tables.
         Dim ds As DataSet = New DataSet()
         ds.Tables.Add(EmployeeTable)
         ds.Tables.Add(CustomerTable)

         Return ds

      End Function
             
      Sub Page_Load(sender As Object, e As EventArgs) 

         ' The data source only needs to be bound to the DataList  
         ' control the first time the page is accessed.    
         If Not IsPostBack Then

            ' Create the sample data for the DataList control.
            ItemsGrid.DataSource = CreateDataSet()

            ' The data source in this example contains multiple tables.  
            ' Specify which table to display in the DataList control. 
            ItemsGrid.DataMember = "Customer"

            ' Bind the data source to the control.
            ItemsGrid.DataBind()

         End If

      End Sub

      Sub Index_Change(sender As Object, e As EventArgs) 

         ' Create the sample data for the DataList control.
         ItemsGrid.DataSource = CreateDataSet()

         ' The data source in this example contains multiple tables. 
         ' Specify which table to display in the DataList control 
         ' based on the user's selection from the DropDownList control. 
         ItemsGrid.DataMember = SourceList.SelectedItem.Text

         ' Bind the data source to the control. 
         ItemsGrid.DataBind()

      End Sub

   </script>

</head>
<body>

   <form id="form1" runat="server">

      <h3> BaseDataList DataMember Example </h3>
      
      <asp:DataGrid id="ItemsGrid"
           AutoGenerateColumns="True" 
           runat="server">

         <headerstyle backcolor="#00aaaa"/>
</asp:DataGrid>

      <br /><br />

      Select the data source: <br />

      <asp:DropDownList id="SourceList"
           AutoPostBack="True"
           OnSelectedIndexChanged="Index_Change"
           runat="server">

         <asp:Listitem Selected="True">Customer</asp:Listitem>
         <asp:Listitem>Employee</asp:Listitem>

      </asp:DropDownList>

   </form>
 
</body>

</html>

Hinweise

Verwenden Sie die- DataMember Eigenschaft zum Angeben eines Members aus einer Datenquelle mit mehreren Membern, die an das Listen Steuerelement gebunden werden soll.Use the DataMember property to specify a member from a multimember data source to bind to the list control. Wenn Sie z. b. eine Datenquelle mit mehr als einer Tabelle in der- DataSource Eigenschaft angegeben haben, verwenden Sie die- DataMember Eigenschaft, um anzugeben, welche Tabelle an ein Daten Auflistungs Steuerelement gebunden werden soll.For example, if you have a data source with more than one table specified in the DataSource property, use the DataMember property to specify which table to bind to a data listing control.

Diese Eigenschaft kann nicht durch Designs oder Stylesheetdesigns festgelegt werden.This property cannot be set by themes or style sheet themes. Weitere Informationen finden Sie unter ThemeableAttribute und ASP.NET-Designs und Skins.For more information, see ThemeableAttribute and ASP.NET Themes and Skins.

Gilt für:

Weitere Informationen