DataGrid.SelectedItem 属性

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.dll

重要

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获取表示 DataGridItem 控件中选定项的 DataGrid 对象。

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; }

[<System.ComponentModel.Browsable(false)>]
member this.SelectedItem : System.Web.UI.WebControls.DataGridItem

Public Overridable ReadOnly Property SelectedItem As DataGridItem

属性值

DataGridItem

一个 DataGridItem 对象，该对象表示 DataGrid 控件中的选定项。

属性: BrowsableAttribute

示例

下面的代码示例演示如何使用 SelectedItem 属性访问控件中 DataList 选定项的属性。

<%@ 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>

注解

使用 SelectedItem 属性获取一个 DataGridItem 对象，该对象表示控件中的 DataGrid 选定项。然后，可以使用此对象访问所选项的属性。

适用于

另请参阅

DataGridItem

通过

DataGrid.SelectedItem 属性

定义

属性值

示例

注解

适用于

另请参阅

其他资源