BaseDataList.SelectedIndexChanged Událost

Definice

Vyvolá se v případě, že je v ovládacím prvku pro výpis dat vybrána jiná položka mezi příspěvky na server.Occurs when a different item is selected in a data listing control between posts to the server.

public:
 event EventHandler ^ SelectedIndexChanged;
public event EventHandler SelectedIndexChanged;
member this.SelectedIndexChanged : EventHandler 
Public Custom Event SelectedIndexChanged As EventHandler 

Event Type

EventHandler

Příklady

Následující příklad kódu ukazuje, jak poskytnout obslužnou rutinu události pro SelectedIndexChanged událost deklarativně.The following code example demonstrates how to provide an event handler for the SelectedIndexChanged event declaratively.


<%@ 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>

Následující příklad kódu ukazuje, jak poskytnout obslužnou rutinu události pro SelectedIndexChanged událost programově.The following code example demonstrates how to provide an event handler for the SelectedIndexChanged event programmatically.


<%@ 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>Programmatic 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 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 />";

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

         // Register event-handling methods.
         ItemsGrid.SelectedIndexChanged += new EventHandler(this.IndexChange_Command);

      }

   </script>

</head>

<body>

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

      <h3>Programmatic BaseDataList SelectedIndexChanged Example</h3>

      Select an item: 

      <br /><br />

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


<%@ 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>Programmatic 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

         ' Register event-handling methods.
         AddHandler ItemsGrid.SelectedIndexChanged, AddressOf IndexChange_Command
      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>Programmatic BaseDataList SelectedIndexChanged Example</h3>

      Select an item: 

      <br /><br />

      <asp:DataGrid id="ItemsGrid" 
           BorderColor="Black"
           ShowFooter="False" 
           CellPadding="3" 
           CellSpacing="0"
           HeaderStyle-BackColor="#aaaadd"
           DataKeyField="IntegerValue"
           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>

Poznámky

SelectedIndexChangedUdálost se vyvolá, když se v ovládacím prvku seznam dat vybere jiná položka mezi příspěvky na server.The SelectedIndexChanged event is raised when a different item is selected in a data listing control between posts to the server.

Další informace o zpracování událostí naleznete v tématu manipulace a vyvolávání událostí.For more information about how to handle events, see Handling and Raising Events.

Platí pro

Viz také