GridViewUpdatedEventArgs.NewValues Eigenschaft

Definition

Ruft ein Wörterbuch ab, das die neuen Name-Wert-Paare der Felder für den aktualisierten Datensatz enthält.Gets a dictionary that contains the new field name/value pairs for the updated record.

public:
 property System::Collections::Specialized::IOrderedDictionary ^ NewValues { System::Collections::Specialized::IOrderedDictionary ^ get(); };
public System.Collections.Specialized.IOrderedDictionary NewValues { get; }
member this.NewValues : System.Collections.Specialized.IOrderedDictionary
Public ReadOnly Property NewValues As IOrderedDictionary

Eigenschaftswert

IOrderedDictionary

Ein Wörterbuch mit den neuen Name-Wert-Paaren der Felder für den aktualisierten Datensatz.A dictionary of the new field name/value pairs for the updated record.

Beispiele

Im folgenden Beispiel wird gezeigt, wie auf die neuen Werte zugegriffen wird, die der Benutzer für die nicht Schlüsselfelder des aktualisierten Datensatzes eingegeben hat.The following example shows how to access the new values entered by the user for the non-key fields of the updated record.


<%@ 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_RowUpdated(Object sender, GridViewUpdatedEventArgs e)
  {
    // Use the Exception property to determine whether an exception
    // occurred during the update operation.
    if (e.Exception == null)
    {
      // Sometimes an error might occur that does not raise an 
      // exception, but prevents the update operation from 
      // completing. Use the AffectedRows property to determine 
      // whether the record was actually updated. 
      if (e.AffectedRows == 1)
      {
        // Use the Keys property to get the value of the key field.
        String keyFieldValue = e.Keys["CustomerID"].ToString();

        // Display a confirmation message.
        Message.Text = "Record " + keyFieldValue +
          " updated successfully. ";

        // Display the new and original values.
        DisplayValues((OrderedDictionary)e.NewValues, (OrderedDictionary)e.OldValues);
      }
      else
      {
        // Display an error message.
        Message.Text = "An error occurred during the update operation.";

        // When an error occurs, keep the GridView
        // control in edit mode.
        e.KeepInEditMode = true;
      }
    }
    else
    {
      // Insert the code to handle the exception.
      Message.Text = e.Exception.Message;

      // Use the ExceptionHandled property to indicate that the 
      // exception is already handled.
      e.ExceptionHandled = true;

      e.KeepInEditMode = true;
    }
  }

  void DisplayValues(OrderedDictionary newValues, OrderedDictionary oldValues)
  {

    Message.Text += "<br/></br>";

    // Iterate through the new and old values. Display the
    // values on the page.
    for (int i = 0; i < oldValues.Count; i++)
    {
      Message.Text += "Old Value=" + oldValues[i].ToString() +
        ", New Value=" + newValues[i].ToString() + "<br/>";
    }

    Message.Text += "</br>";

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridViewUpdatedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridViewUpdatedEventArgs Example</h3>
            
      <!-- The GridView control automatically sets the columns     -->
      <!-- specified in the datakeynames property as read-only.    -->
      <!-- No input controls are rendered for these columns in     -->
      <!-- edit mode.                                              -->
      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="true"
        autogenerateeditbutton="true"
        allowpaging="true" 
        datakeynames="CustomerID"
        onrowupdated="CustomersGridView_RowUpdated" 
        runat="server">
      </asp:gridview>
      
      <br/>
      
      <asp:label id="Message"
        forecolor="Red"          
        runat="server"/>
            
      <!-- 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]"
        updatecommand="Update Customers SET CompanyName=@CompanyName, Address=@Address, City=@City, PostalCode=@PostalCode, Country=@Country WHERE (CustomerID = @CustomerID)"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        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 CustomersGridView_RowUpdated(sender As Object, e As GridViewUpdatedEventArgs)
  
    ' Use the Exception property to determine whether an exception
    ' occurred during the update operation.
    If e.Exception Is Nothing Then
    
      ' Sometimes an error might occur that does not raise an 
      ' exception, but prevents the update operation from 
      ' completing. Use the AffectedRows property to determine 
      ' whether the record was actually updated. 
      If e.AffectedRows = 1 Then
      
        ' Use the Keys property to get the value of the key field.
        Dim keyFieldValue As String = e.Keys("CustomerID").ToString()

        ' Display a confirmation message.
        Message.Text = "Record " & keyFieldValue & _
          " updated successfully. "

        ' Display the new and original values.
        DisplayValues(CType(e.NewValues, OrderedDictionary), CType(e.OldValues, OrderedDictionary))

      Else
      
        ' Display an error message.
        Message.Text = "An error occurred during the update operation."

        ' When an error occurs, keep the GridView
        ' control in edit mode.
        e.KeepInEditMode = True
        
      End If
    
    Else
    
      ' Insert the code to handle the exception.
      Message.Text = e.Exception.Message

      ' Use the ExceptionHandled property to indicate that the 
      ' exception is already handled.
      e.ExceptionHandled = True

      e.KeepInEditMode = True
    
    End If
  
  End Sub

  Sub DisplayValues(ByVal newValues As OrderedDictionary, ByVal oldValues As OrderedDictionary)

    Message.Text &= "<br/></br>"

    ' Iterate through the new and old values. Display the
    ' values on the page.
    Dim i As Integer
    For i = 0 To oldValues.Count - 1
    
      Message.Text &= "Old Value=" & oldValues(i).ToString() & _
        ", New Value=" & newValues(i).ToString() & "<br/>"
    Next

    Message.Text &= "</br>"

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridViewUpdatedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridViewUpdatedEventArgs Example</h3>
            
      <!-- The GridView control automatically sets the columns     -->
      <!-- specified in the datakeynames property as read-only.    -->
      <!-- No input controls are rendered for these columns in     -->
      <!-- edit mode.                                              -->
      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="true"
        autogenerateeditbutton="true"
        allowpaging="true" 
        datakeynames="CustomerID"
        onrowupdated="CustomersGridView_RowUpdated" 
        runat="server">
      </asp:gridview>
      
      <br/>
      
      <asp:label id="Message"
        forecolor="Red"          
        runat="server"/>
            
      <!-- 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]"
        updatecommand="Update Customers SET CompanyName=@CompanyName, Address=@Address, City=@City, PostalCode=@PostalCode, Country=@Country WHERE (CustomerID = @CustomerID)"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>

Hinweise

Verwenden Sie die- NewValues Eigenschaft, um auf die neuen Feldwerte für den aktualisierten Datensatz zuzugreifen.Use the NewValues property to access the new field values for the updated record. Beispielsweise können Sie diese Werte verwenden, um ein Protokoll mit aktualisierten Datensätzen zu speichern.For example, you can use these values to keep a log of updated records.

Die NewValues-Eigenschaft gibt ein Objekt zurück, das die System.Collections.Specialized.IOrderedDictionary-Schnittstelle implementiert.The NewValues property returns an object that implements the System.Collections.Specialized.IOrderedDictionary interface. Das-Objekt enthält- System.Collections.DictionaryEntry Objekte, die die Felder des aktualisierten Datensatzes darstellen.The object contains System.Collections.DictionaryEntry objects that represent the fields of the updated record.

Hinweis

Als Verknüpfung können Sie auch den Indexer des- IOrderedDictionary Objekts verwenden, um direkt auf die Feldwerte zuzugreifen.As a shortcut, you can also use the indexer of the IOrderedDictionary object to access the field values directly.

Gilt für:

Siehe auch