DataGrid.SelectedItem Eigenschaft

Definition

Ruft ein DataGridItem-Objekt ab, das das im DataGrid-Steuerelement ausgewählte Element darstellt.Gets a DataGridItem object that represents the selected item in the DataGrid control.

public:
 virtual property System::Web::UI::WebControls::DataGridItem ^ SelectedItem { System::Web::UI::WebControls::DataGridItem ^ get(); };
[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.DataGridItem SelectedItem { get; }
member this.SelectedItem : System.Web.UI.WebControls.DataGridItem
Public Overridable ReadOnly Property SelectedItem As DataGridItem

Eigenschaftswert

Ein DataGridItem-Objekt, das das ausgewählte Element im DataGrid-Steuerelement darstellt.A DataGridItem object that represents the selected item in the DataGrid control.

Attribute

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die SelectedItem-Eigenschaft verwendet wird, um auf die Eigenschaften des ausgewählten Elements im DataList-Steuerelement zuzugreifen.The following code example demonstrates how to use the SelectedItem property to access the properties of the selected item in the DataList 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" >

   <script language="C#" runat="server">
 
      DataTable Cart = new DataTable();
      DataView CartView;   
 
      void Page_Load(Object sender, EventArgs e) 
      {
         DataRow dr;
 
         if (Session["ShoppingCart"] == null) 
         {       
            Cart.Columns.Add(new DataColumn("Qty", typeof(String)));
            Cart.Columns.Add(new DataColumn("Item", typeof(String)));
            Cart.Columns.Add(new DataColumn("Price", typeof(String)));
            Session["ShoppingCart"] = Cart;
             
            // Create rows and add sample data.
            for (int i = 1; i <= 9; i++) 
            {
               dr = Cart.NewRow();
               if (i % 2 != 0)
                  dr[0] = "2";
               else
                  dr[0] = "1";
               dr[1] = "Item " + i.ToString();
               dr[2] = (1.23 * (i + 1)).ToString();
               Cart.Rows.Add(dr);
            }
         }
         else
            Cart = (DataTable)Session["ShoppingCart"];          
 
         CartView = new DataView(Cart);
         CartView.Sort="Item";
 
         if (!IsPostBack)
            BindGrid();                    
      }
 
      void MyDataGrid_Select(Object sender, EventArgs e) 
      {
 
         Label1.Text = "You selected " +
                       MyDataGrid.SelectedItem.Cells[1].Text +
                       ".<br />" + 
                       MyDataGrid.SelectedItem.Cells[1].Text +
                       " has an index number of " +
                       MyDataGrid.SelectedIndex.ToString() + ".";
                                
      }

      void Select_Button_Click(Object sender, EventArgs e) 
      {
 
         MyDataGrid.SelectedIndex = 4;
                                
      }

      void UnSelect_Button_Click(Object sender, EventArgs e) 
      {
 
         MyDataGrid.SelectedIndex = -1;
         Label1.Text = "";
                                
      }
 
      void BindGrid() 
      {
         MyDataGrid.DataSource = CartView;
         MyDataGrid.DataBind();
      } 
 
   </script>
 
<head runat="server">
    <title>DataGrid Selection Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGrid Selection Example</h3>
 
      <asp:DataGrid id="MyDataGrid" runat="server"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           Font-Names="Verdana"
           Font-Size="8pt"
           OnSelectedIndexChanged="MyDataGrid_Select"
           AutoGenerateColumns="false">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <SelectedItemStyle BackColor="Yellow">
         </SelectedItemStyle>
 
         <Columns>

            <asp:ButtonColumn
                 HeaderText="Select Item"
                 ButtonType="LinkButton"
                 Text="Select"
                 CommandName="Select">

            </asp:ButtonColumn>
 
            <asp:BoundColumn 
                 HeaderText="Item" 
                 ReadOnly="true" 
                 DataField="Item"/>

            <asp:BoundColumn 
                 HeaderText="Quantity" 
                 DataField="Qty"/>

            <asp:BoundColumn 
                 HeaderText="Price" 
                 DataField="Price"/>

         </Columns>

      </asp:DataGrid>

      <br /><br />

      <asp:Button id="Button1"
           Text="Select Item 5"
           OnClick="Select_Button_Click"
           runat="server"/>

      <asp:Button id="Button2"
           Text="Unselect Item"
           OnClick="UnSelect_Button_Click"
           runat="server"/>

      <br /><br />

      <asp:Label id="Label1" runat="server"/> 
 
   </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" >

   <script language="VB" runat="server">
 
        Dim Cart As New DataTable
        Dim CartView As DataView
        
        Sub Page_Load(sender As Object, e As EventArgs)
            Dim dr As DataRow
            
            If Session("ShoppingCart") Is Nothing Then
                Cart.Columns.Add(New DataColumn("Qty", GetType(String)))
                Cart.Columns.Add(New DataColumn("Item", GetType(String)))
                Cart.Columns.Add(New DataColumn("Price", GetType(String)))
                Session("ShoppingCart") = Cart
                
                ' Create rows and add sample data.
                Dim i As Integer
                For i = 1 To 9
                    dr = Cart.NewRow()
                    If i Mod 2 <> 0 Then
                        dr(0) = "2"
                    Else
                        dr(0) = "1"
                    End If
                    dr(1) = "Item " & i.ToString()
                    dr(2) =(1.23 *(i + 1)).ToString()
                    Cart.Rows.Add(dr)
                Next i
            Else
                Cart = CType(Session("ShoppingCart"), DataTable)
            End If 
            CartView = New DataView(Cart)
            CartView.Sort = "Item"
            
            If Not IsPostBack Then
                BindGrid()
            End If
        End Sub 'Page_Load
         
        Sub MyDataGrid_Select(sender As Object, e As EventArgs)
            
            Label1.Text = "You selected " & MyDataGrid.SelectedItem.Cells(1).Text & _
                ".<br />" & MyDataGrid.SelectedItem.Cells(1).Text & " has an index number of " & _
                MyDataGrid.SelectedIndex.ToString() & "."
        End Sub 'MyDataGrid_Select

        Sub Select_Button_Click(sender As Object, e As EventArgs)
            
            MyDataGrid.SelectedIndex = 4
        End Sub 'Select_Button_Click
         
        Sub UnSelect_Button_Click(sender As Object, e As EventArgs)
            
            MyDataGrid.SelectedIndex = - 1
            Label1.Text = ""
        End Sub 'UnSelect_Button_Click
         
        Sub BindGrid()
            MyDataGrid.DataSource = CartView
            MyDataGrid.DataBind()
        End Sub 'BindGrid
 
   </script>
 
<head runat="server">
    <title>DataGrid Selection Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGrid Selection Example</h3>
 
      <asp:DataGrid id="MyDataGrid" runat="server"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           Font-Names="Verdana"
           Font-Size="8pt"
           OnSelectedIndexChanged="MyDataGrid_Select"
           AutoGenerateColumns="false">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <SelectedItemStyle BackColor="Yellow">
         </SelectedItemStyle>
 
         <Columns>

            <asp:ButtonColumn
                 HeaderText="Select Item"
                 ButtonType="LinkButton"
                 Text="Select"
                 CommandName="Select">

            </asp:ButtonColumn>
 
            <asp:BoundColumn 
                 HeaderText="Item" 
                 ReadOnly="true" 
                 DataField="Item"/>

            <asp:BoundColumn 
                 HeaderText="Quantity" 
                 DataField="Qty"/>

            <asp:BoundColumn 
                 HeaderText="Price" 
                 DataField="Price"/>

         </Columns>

      </asp:DataGrid>

      <br /><br />

      <asp:Button id="Button1"
           Text="Select Item 5"
           OnClick="Select_Button_Click"
           runat="server"/>

      <asp:Button id="Button2"
           Text="Unselect Item"
           OnClick="UnSelect_Button_Click"
           runat="server"/>

      <br /><br />

      <asp:Label id="Label1" runat="server"/> 
 
   </form>
 
</body>
</html>


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

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

      ICollection CreateDataSource() 
      {
      
         // Create sample data for the DataGrid control.
         DataTable dt = new DataTable();
         DataRow dr;
 
         // Define the columns of the table.
         dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
         dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
         dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));

         // Populate the table with sample values.
         for (int i = 0; i < 9; i++) 
         {
            dr = dt.NewRow();
 
            dr[0] = i;
            dr[1] = "Item " + i.ToString();
            dr[2] = 1.23 * (i + 1);
 
            dt.Rows.Add(dr);
         }
 
         // Create a DataView from the DataTable.
         DataView dv = new DataView(dt);
         return dv;

      }
 
      void Page_Load(Object sender, EventArgs e) 
      {
 
         // Load sample data only once, when the page is first loaded.
         if (!IsPostBack) 
         {
            ItemsGrid.DataSource = CreateDataSource();
            ItemsGrid.DataBind();
         }

      }

      void IndexChange_Command(Object sender, EventArgs e)
      {
          
         // Display the details of the selected item.
         DetailsLabel.Text = 
            "Item Number: " + ItemsGrid.SelectedItem.Cells[1].Text + "<br />" +
            "Description: " + ItemsGrid.SelectedItem.Cells[2].Text + "<br />" +
            "Price: $" + ItemsGrid.SelectedItem.Cells[3].Text + "<br />";

      }

   </script>

</head>

<body>

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

      <h3>Declarative BaseDataList SelectedIndexChanged Example</h3>

      Select an item: 

      <br /><br />

      <asp:DataGrid id="ItemsGrid" 
           BorderColor="Black"
           ShowFooter="False" 
           CellPadding="3" 
           CellSpacing="0"
           HeaderStyle-BackColor="#aaaadd"
           OnSelectedIndexChanged="IndexChange_Command"
           runat="server">

         <Columns>

            <asp:ButtonColumn Text="Select"
                 CommandName="Select"/>

         </Columns>

      </asp:DataGrid>

      <hr />

      <table style="border-width:1; border-color:Black; margin:0">

         <tr style="background-color:#aaaadd">

            <td>

               Details

            </td>

         </tr>

         <tr>

            <td>

               <asp:Label id="DetailsLabel"
                    runat="server"
                    Text="No item selected."/>

            </td>

         </tr>

      </table>

   </form>

</body>
</html>


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

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

      Function CreateDataSource() As ICollection 
      
         ' Create sample data for the DataGrid control.
         Dim dt As DataTable = New DataTable()
         Dim dr As DataRow
 
         ' Define the columns of the table.
         dt.Columns.Add(New DataColumn("IntegerValue", GetType(Integer)))
         dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
         dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))

         ' Populate the table with sample values.
         Dim i As Integer

         For i = 0 to 8
      
            dr = dt.NewRow()
 
            dr(0) = i
            dr(1) = "Item " & i.ToString()
            dr(2) = 1.23 * (i + 1)
 
            dt.Rows.Add(dr)
         
         Next i
 
         ' Create a DataView from the DataTable.
         Dim dv As DataView = New DataView(dt)
         Return dv

      End Function
 
      Sub Page_Load(sender As Object, e As EventArgs) 
 
         ' Load sample data only once when the page is first loaded.
         If Not IsPostBack Then 
         
            ItemsGrid.DataSource = CreateDataSource()
            ItemsGrid.DataBind()
         
         End If

      End Sub

      Sub IndexChange_Command(sender As Object, e As EventArgs)
          
         ' Display the details of the selected item.
         DetailsLabel.Text = _
            "Item Number: " & ItemsGrid.SelectedItem.Cells(1).Text & "<br />" & _
            "Description: " & ItemsGrid.SelectedItem.Cells(2).Text & "<br />" & _
            "Price: $" & ItemsGrid.SelectedItem.Cells(3).Text & "<br />"

      End Sub

   </script>

</head>

<body>

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

      <h3>Declarative BaseDataList SelectedIndexChanged Example</h3>

      Select an item: 

      <br /><br />

      <asp:DataGrid id="ItemsGrid" 
           BorderColor="Black"
           ShowFooter="False" 
           CellPadding="3" 
           CellSpacing="0"
           HeaderStyle-BackColor="#aaaadd"
           OnSelectedIndexChanged="IndexChange_Command"
           runat="server">

         <Columns>

            <asp:ButtonColumn Text="Select"
                 CommandName="Select"/>

         </Columns>

      </asp:DataGrid>

      <hr />

      <table border="1" style="border-color:Black; margin:0">

         <tr style="background-color:#aaaadd">

            <td>

               Details

            </td>

         </tr>

         <tr>

            <td>

               <asp:Label id="DetailsLabel"
                    runat="server"
                    Text="No item selected."/>

            </td>

         </tr>

      </table>

   </form>

</body>
</html>

Hinweise

Verwenden Sie die SelectedItem-Eigenschaft, um ein DataGridItem Objekt zu erhalten, das das ausgewählte Element im DataGrid-Steuerelement darstellt.Use the SelectedItem property to get a DataGridItem object that represents the selected item in the DataGrid control. Dieses Objekt kann dann für den Zugriff auf die Eigenschaften des ausgewählten Elements verwendet werden.This object can then be used to access the properties of the selected item.

Gilt für:

Siehe auch