GridViewDeleteEventArgs.Values Eigenschaft

Referenz

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Wichtig

Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.

Ruft ein Wörterbuch mit Name-Wert-Paaren der Nicht-Schlüsselfelder für die zu löschende Zeile ab.

public:
 property System::Collections::Specialized::IOrderedDictionary ^ Values { System::Collections::Specialized::IOrderedDictionary ^ get(); };

public System.Collections.Specialized.IOrderedDictionary Values { get; }

member this.Values : System.Collections.Specialized.IOrderedDictionary

Public ReadOnly Property Values As IOrderedDictionary

Eigenschaftswert

IOrderedDictionary

Ein IOrderedDictionary-Objekt, das die Name-Wert-Paare der Nicht-Schlüsselfelder der zu löschenden Zeile enthält.

Beispiele

Das folgende Beispiel zeigt, wie Sie die Values -Eigenschaft verwenden, um die Werte der Nichtschlüsselfelder für die zu löschende Zeile abzurufen. Die Werte werden dann in eine Protokolldatei mit gelöschten Datensätzen geschrieben.


<%@ Page language="C#" %>
<%@ import namespace="System.IO" %>

<!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_RowDeleting(Object sender, GridViewDeleteEventArgs e)
  {

    // Record the delete operation in a log file.

    // Create the log text. 
    String logText = "";

    // Append the values of the key fields to the log text.
    foreach (DictionaryEntry keyEntry in e.Keys)
    {
      logText += keyEntry.Key + "=" + keyEntry.Value + ";";
    }

    // Append the values of the non-key fields to the log text.
    foreach (DictionaryEntry valueEntry in e.Values)
    {
      logText += valueEntry.Key + "=" + valueEntry.Value + ";";
    }

    // Display the log content.
    LogTextLabel.Text = logText;
    
    // Append the text to a log file.
    try
    {
      StreamWriter sw;
      sw = File.AppendText(Server.MapPath(null) + "\\deletelog.txt");
      sw.WriteLine(logText);
      sw.Flush();
      sw.Close();
    }
    catch(UnauthorizedAccessException ex)
    {
      // You must provide read/write access to the file using ACLs.
      LogErrorLabel.Text = "You do not have permission to write to the log.";
    }

  }
    
  void CustomersGridView_RowDeleted(Object sender, GridViewDeletedEventArgs e)
  {
    
    if (e.Exception == null)
    {
      // The delete operation succeeded. Clear the message label.
      Message.Text = "";
    }
    else
    {
      // The delete operation failed. Display an error message.
      Message.Text = e.AffectedRows.ToString() + " rows deleted. " + e.Exception.Message;
      e.ExceptionHandled = true;
    }
        
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridViewDeleteEventArgs Keys and Values Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridViewDeleteEventArgs Keys and Values Example</h3>
            
      <asp:label id="Message"
        forecolor="Red"          
        runat="server"/>
        
      <br/>
      
      <asp:label id="LogTextLabel"
        forecolor="Red"          
        runat="server"/>
        
      <br/>
        
      <asp:label id="LogErrorLabel"
        forecolor="Red"          
        runat="server"/>
                
      <br/>

      <asp:gridview id="CustomersGridView" 
        allowpaging="true"
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="true"
        autogeneratedeletebutton="true" 
        datakeynames="CustomerID"
        onrowdeleted="CustomersGridView_RowDeleted"
        onrowdeleting="CustomersGridView_RowDeleting"   
        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="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        deletecommand="Delete from Customers where CustomerID = @CustomerID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>


<%@ Page language="VB" %>
<%@ import namespace="System.IO" %>

<!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_RowDeleting(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs)

    ' Record the delete operation in a log file.

    ' Create the log text. 
    Dim logText As String = ""

    ' Append the values of the key fields to the log text.
    Dim i As Integer
    For i = 0 To e.Keys.Count - 1
    
      logText &= e.Keys(i).ToString() & ";"
      
    Next

    ' Append the values of the non-key fields to the log text.
    For i = 0 To e.Values.Count - 1
    
      If e.Values(i) IsNot Nothing Then
        logText &= e.Values(i).ToString() & ";"
      Else
        logText &= "Nothing" & ";"
      End If
      
    Next
    
    ' Display the log content.
    LogTextLabel.Text = logText

    ' Append the text to a log file.
    Try
    
      Dim sw As StreamWriter
      sw = File.AppendText(Server.MapPath(Nothing) & "\deletelog.txt")
      sw.WriteLine(logText)
      sw.Flush()
      sw.Close()
    
    Catch ex As UnauthorizedAccessException
    
      ' You must provide read/write access to the file using ACLs.
      LogErrorLabel.Text = "You do not have permission to write to the log."
    
    End Try

  End Sub
    
  Sub CustomersGridView_RowDeleted(ByVal sender As Object, ByVal e As GridViewDeletedEventArgs)
    
    If e.Exception Is Nothing Then
    
      ' The delete operation succeeded. Clear the message label.
      Message.Text = ""
    
    Else
    
      ' The delete operation failed. Display an error message.
      Message.Text = e.AffectedRows.ToString() & " rows deleted. " & e.Exception.Message
      e.ExceptionHandled = True
      
    End If
        
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridViewDeleteEventArgs Keys and Values Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridViewDeleteEventArgs Keys and Values Example</h3>
            
      <asp:label id="Message"
        forecolor="Red"          
        runat="server"/>
        
      <br/>
      
      <asp:label id="LogTextLabel"
        forecolor="Red"          
        runat="server"/>
        
      <br/>
        
      <asp:label id="LogErrorLabel"
        forecolor="Red"          
        runat="server"/>
                
      <br/>

      <asp:gridview id="CustomersGridView" 
        allowpaging="true"
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="true"
        autogeneratedeletebutton="true" 
        datakeynames="CustomerID"
        onrowdeleted="CustomersGridView_RowDeleted"
        onrowdeleting="CustomersGridView_RowDeleting"   
        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="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        deletecommand="Delete from Customers where CustomerID = @CustomerID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>

Hinweise

Die Values Eigenschaft wird automatisch mit den Namen-Wert-Paaren der Nichtschlüsselfelder für die Zeile aufgefüllt. Um den Feldnamen eines Eintrags zu bestimmen, verwenden Sie die DictionaryEntry.Key Eigenschaft eines System.Collections.DictionaryEntry Objekts im Values Wörterbuch. Verwenden Sie die -Eigenschaft, um den DictionaryEntry.Value Wert eines Eintrags zu bestimmen.

Hinweis

Die Primärschlüsselfelder sind in diesem Wörterbuch nicht enthalten. Verwenden Sie Keys die -Eigenschaft, um auf die Werte des Oder der Primärschlüsselfelder zuzugreifen.

Gilt für:

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