GridViewSortEventHandler Delegera

Definition

Namnområde:: System.Web.UI.WebControls

Sammansättning:: System.Web.dll

Viktigt

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Representerar den metod som hanterar händelsen för Sorting en GridView kontroll.

public delegate void GridViewSortEventHandler(System::Object ^ sender, GridViewSortEventArgs ^ e);

public delegate void GridViewSortEventHandler(object sender, GridViewSortEventArgs e);

type GridViewSortEventHandler = delegate of obj * GridViewSortEventArgs -> unit

Public Delegate Sub GridViewSortEventHandler(sender As Object, e As GridViewSortEventArgs)

Parametrar

sender: Object

Källan till händelsen.

e: GridViewSortEventArgs

Ett GridViewSortEventArgs objekt som innehåller händelsedata.

Exempel

I följande exempel visas hur du programmatiskt lägger till ett GridViewSortEventHandler ombud i Sorting händelsen för en GridView kontroll.


<%@ Page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    void Page_Load(Object sender, EventArgs e)
    {
        
        // Create a new GridView object.
        GridView authorGridView = new GridView();
         
        // Set the GridView object's properties.
        authorGridView.ID = "AuthorGridView";
        authorGridView.DataSourceID = "AuthorsSqlDataSource"; 
        authorGridView.AutoGenerateColumns = true;
        authorGridView.AllowSorting = true;
        
        // Programmatically register the event-handling methods.
        authorGridView.Sorting += new GridViewSortEventHandler(this.AuthorsGridView_Sorting);
        
        // Add the GridView object to the Controls collection
        // of the PlaceHolder control.
        GridViewPlaceHolder.Controls.Add(authorGridView);
        
    }
    
    void AuthorsGridView_Sorting(Object sender, GridViewSortEventArgs e)
    {
    
        // Cancel the sorting operation if the user attempts to sort
        // the Contract column.
        if(e.SortExpression == "contract")
        {
            e.Cancel = true;
            Message.Text = "You cannot sort the Contract column.";
        }
        else
        {
            // Clear the message label.
            Message.Text = "";
        }
    
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
    <head runat="server">
    <title>GridViewSortEventHandler Example</title>
</head>
<body>
        <form id="form1" runat="server">
        
            <h3>GridViewSortEventHandler Example</h3>
            
            <asp:label id="Message"
                forecolor="Red"
                runat="server"/>
                
            <br/>
            
            <asp:placeholder id="GridViewPlaceHolder"
                runat="Server"/>
            
            <!-- This example uses Microsoft SQL Server and connects -->
            <!-- to the Pubs sample database.                         -->
            <asp:sqldatasource id="AuthorsSqlDataSource"  
                selectcommand="SELECT [au_id], [au_lname], [au_fname], [address], [city], [state], [zip], [contract] FROM [authors]"
                updatecommand="UPDATE authors SET au_lname=@au_lname, au_fname=@au_fname, address=@address, city=@city, state=@state, zip=@zip, contract=@contract WHERE (authors.au_id = @au_id)"
                connectionstring="server=localhost;database=pubs;integrated security=SSPI"
                runat="server">
            </asp:sqldatasource>
            
        </form>
    </body>
</html>


<%@ Page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
        
        ' Create a new GridView object.
        Dim authorGridView As GridView = New GridView
         
        ' Set the GridView object's properties.
        authorGridView.ID = "AuthorGridView"
        authorGridView.DataSourceID = "AuthorsSqlDataSource"
        authorGridView.AutoGenerateColumns = True
        authorGridView.AllowSorting = True
        
        ' Programmatically register the event-handling methods.
        AddHandler authorGridView.Sorting, AddressOf AuthorsGridView_Sorting
        
        ' Add the GridView object to the Controls collection
        ' of the PlaceHolder control.
        GridViewPlaceHolder.Controls.Add(authorGridView)
        
    End Sub
    
    Sub AuthorsGridView_Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs)
    
        ' Cancel the sorting operation if the user attempts to sort
        ' the Contract column.
        If e.SortExpression = "contract" Then

            e.Cancel = True
            Message.Text = "You cannot sort the Contract column."
        
        Else
      
            ' Clear the message label.
            Message.Text = ""
        
        End If
    
    End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
    <head runat="server">
    <title>GridViewSortEventHandler Example</title>
</head>
<body>
        <form id="form1" runat="server">
        
            <h3>GridViewSortEventHandler Example</h3>
            
            <asp:label id="Message"
                forecolor="Red"
                runat="server"/>
                
            <br/>
            
            <asp:placeholder id="GridViewPlaceHolder"
                runat="Server"/>
            
            <!-- This example uses Microsoft SQL Server and connects -->
            <!-- to the Pubs sample database.                         -->
            <asp:sqldatasource id="AuthorsSqlDataSource"  
                selectcommand="SELECT [au_id], [au_lname], [au_fname], [address], [city], [state], [zip], [contract] FROM [authors]"
                updatecommand="UPDATE authors SET au_lname=@au_lname, au_fname=@au_fname, address=@address, city=@city, state=@state, zip=@zip, contract=@contract WHERE (authors.au_id = @au_id)"
                connectionstring="server=localhost;database=pubs;integrated security=SSPI"
                runat="server">
            </asp:sqldatasource>
            
        </form>
    </body>
</html>

I följande exempel visas hur du deklarativt lägger till ett GridViewSortEventHandler ombud i Sorting händelsen för en GridView kontroll.


<%@ Page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  void CustomersGridView_Sorting(Object sender, GridViewSortEventArgs e)
  {
    // Cancel the sorting operation if the user attempts
    // to sort by address.
    if (e.SortExpression == "Address")
    {
      e.Cancel = true;
      Message.Text = "You cannot sort by address.";
      SortInformationLabel.Text = "";
    }
    else
    {
      Message.Text = "";
    }
  }

  void CustomersGridView_Sorted(Object sender, EventArgs e)
  {
    // Display the sort expression and sort direction.
    SortInformationLabel.Text = "Sorting by " +
      CustomersGridView.SortExpression.ToString() +
      " in " + CustomersGridView.SortDirection.ToString() +
      " order.";
  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView Sorting Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView Sorting Example</h3>

      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
        
      <br/>
        
      <asp:label id="SortInformationLabel"
        forecolor="Navy"
        runat="server"/>
                
      <br/>  

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        allowpaging="true"
        emptydatatext="No data available." 
        allowsorting="true"
        onsorting="CustomersGridView_Sorting"
        onsorted="CustomersGridView_Sorted"  
        runat="server">
                
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
        
    </form>
  </body>
</html>


<%@ Page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  Sub CustomersGridView_Sorting(sender As Object, e As GridViewSortEventArgs)
  
    ' Cancel the sorting operation if the user attempts
    ' to sort by address.
    If e.SortExpression = "Address" Then
    
      e.Cancel = True
      Message.Text = "You cannot sort by address."
      SortInformationLabel.Text = ""
    
    Else
    
      Message.Text = ""
      
    End If
    
  End Sub

  Sub CustomersGridView_Sorted(ByVal sender As Object, ByVal e As EventArgs)
 
    ' Display the sort expression and sort direction.
    SortInformationLabel.Text = "Sorting by " & _
      CustomersGridView.SortExpression.ToString() & _
      " in " & CustomersGridView.SortDirection.ToString() & _
      " order."
    
  End Sub
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView Sorted and Sorting Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView Sorted and Sorting Example</h3>

      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
        
      <br/>
        
      <asp:label id="SortInformationLabel"
        forecolor="Navy"
        runat="server"/>
                
      <br/>  

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        allowpaging="true"
        emptydatatext="No data available." 
        allowsorting="true"
        onsorting="CustomersGridView_Sorting"
        onsorted="CustomersGridView_Sorted"  
        runat="server">
                
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
        
    </form>
  </body>
</html>

Kommentarer

Händelsen Sorting utlöses när hyperlänken för att sortera en kolumn klickas, men innan GridView kontrollen hanterar sorteringsåtgärden. På så sätt kan du ange en händelsehanteringsmetod som utför en anpassad rutin, till exempel att avbryta sorteringsåtgärden, när den här händelsen inträffar.

När du skapar ett GridViewSortEventHandler ombud identifierar du den metod som ska hantera händelsen. Om du vill associera händelsen med händelsehanteraren lägger du till en instans av ombudet till händelsen. Händelsehanteraren anropas när händelsen inträffar, såvida du inte tar bort ombudet. Mer information om ombud för händelsehanterare finns i Hantera och höja händelser.

Tilläggsmetoder

Name	Description
GetMethodInfo(Delegate)	Hämtar ett objekt som representerar den metod som representeras av det angivna ombudet.

Gäller för

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