FormViewUpdatedEventArgs FormViewUpdatedEventArgs FormViewUpdatedEventArgs FormViewUpdatedEventArgs Class

Definition

Stellt Daten für das ItemUpdated-Ereignis bereit.Provides data for the ItemUpdated event.

public ref class FormViewUpdatedEventArgs : EventArgs
public class FormViewUpdatedEventArgs : EventArgs
type FormViewUpdatedEventArgs = class
    inherit EventArgs
Public Class FormViewUpdatedEventArgs
Inherits EventArgs
Vererbung
FormViewUpdatedEventArgsFormViewUpdatedEventArgsFormViewUpdatedEventArgsFormViewUpdatedEventArgs

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie das FormViewUpdatedEventArgs -Objekt verwendet wird, das an die Ereignis Behandlungs ItemUpdated Methode für das-Ereignis übermittelt wird, um zu bestimmen, ob während eines Update Vorgangs eine Ausnahme aufgetreten istThe following example demonstrates how to use the FormViewUpdatedEventArgs object passed to the event-handling method for the ItemUpdated event to determine whether an exception occurred during an update operation.


<%@ 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 EmployeeFormView_ItemUpdated(Object sender, FormViewUpdatedEventArgs 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["EmployeeID"].ToString();

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

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

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

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

      e.KeepInEditMode = true;
    }
  }

  void DisplayValues(OrderedDictionary newValues, OrderedDictionary oldValues)
  {

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

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

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

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>FormViewUpdatedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>FormViewUpdatedEventArgs Example</h3>
                       
      <asp:formview id="EmployeeFormView"
        datasourceid="EmployeeSource"
        allowpaging="true"
        datakeynames="EmployeeID"
        emptydatatext="No employees found."
        onitemupdated="EmployeeFormView_ItemUpdated"   
        runat="server">
        
        <itemtemplate>
          <table>
            <tr>
              <td rowspan="6">
                <asp:image id="EmployeeImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td colspan="2">
                  &nbsp; 
              </td>
            </tr>
            <tr>
              <td>
                <b>Name:</b>
              </td>
              <td>
                <%# Eval("FirstName") %> <%# Eval("LastName") %>
              </td>
            </tr>
            <tr>
              <td>
                <b>Title:</b>
              </td>
              <td>
                <%# Eval("Title") %>
              </td>
            </tr>
            <tr>
              <td>
                <b>Hire Date:</b>                 
              </td>
              <td>
                <%# Eval("HireDate","{0:d}") %>
              </td>
            </tr>
            <tr style="height:150" valign="top">
              <td>
                <b>Address:</b>
              </td>
              <td>
                <%# Eval("Address") %><br/>
                <%# Eval("City") %> <%# Eval("Region") %>
                <%# Eval("PostalCode") %><br/>
                <%# Eval("Country") %>   
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:linkbutton id="Edit"
                  text="Edit"
                  commandname="Edit"
                  runat="server"/> 
              </td>
            </tr>
          </table>       
        </itemtemplate>
        <edititemtemplate>
          <table>
            <tr>
              <td rowspan="6">
                <asp:image id="EmployeeEditImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td colspan="2">
                  &nbsp; 
              </td>
            </tr>
            <tr>
              <td>
                <b><asp:Label runat="server" 
                  AssociatedControlID="FirstNameUpdateTextBox" 
                  Text="Name" />:</b>
              </td>
              <td>
                <asp:textbox id="FirstNameUpdateTextBox"
                  text='<%# Bind("FirstName") %>'
                  accesskey="n" tabindex="1" runat="server"/>
                <asp:textbox id="LastNameUpdateTextBox"
                  text='<%# Bind("LastName") %>'
                  accesskey="l" tabindex="2" runat="server"/>
              </td>
            </tr>
            <tr>
              <td>
                <b><asp:Label runat="server" 
                  AssociatedControlID="TitleUpdateTextBox" 
                  Text="Title" />:</b>
              </td>
              <td>
                <asp:textbox id="TitleUpdateTextBox"
                  text='<%# Bind("Title") %>'
                  accesskey="t" tabindex="3" runat="server"/> 
              </td>
            </tr>
            <tr>
                <b><asp:Label runat="server" 
                  AssociatedControlID="HireDateUpdateTextBox" 
                  Text="Hire Date" />:</b>
              <td>
                <asp:textbox id="HireDateUpdateTextBox"
                  text='<%# Bind("HireDate", "{0:d}") %>'
                  accesskey="h" tabindex="4" runat="server" />
              </td>
            </tr>
            <tr style="height:150" valign="top">
              <td>
                <b><asp:Label runat="server" 
                  AssociatedControlID="AddressUpdateTextBox" 
                  Text="Address" />:</b>
              </td>
              <td>
                <asp:textbox id="AddressUpdateTextBox"
                  text='<%# Bind("Address") %>'
                  accesskey="a" tabindex="5" runat="server"/>
                <br/>
                <asp:textbox id="CityUpdateTextBox"
                  text='<%# Bind("City") %>'
                  accesskey="c" tabindex="6" runat="server"/> 
                <asp:textbox id="RegionUpdateTextBox"
                  text='<%# Bind("Region") %>'
                  width="40"
                  accesskey="r" tabindex="7" runat="server"/>
                <asp:textbox id="PostalCodeUpdateTextBox"
                  text='<%# Bind("PostalCode") %>'
                  width="60"
                  accesskey="p" tabindex="8" runat="server"/>
                <br/>
                <asp:textbox id="CountryUpdateTextBox"
                  text='<%# Bind("Country") %>'
                  accesskey="u" tabindex="9" runat="server"/> 
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:linkbutton id="UpdateButton"
                  text="Update" tabindex="10" 
                  commandname="Update"
                  runat="server"/>
                <asp:linkbutton id="CancelButton"
                  text="Cancel" tabindex="11" 
                  commandname="Cancel"
                  runat="server"/> 
              </td>
            </tr>
          </table>       
        </edititemtemplate>
                  
      </asp:formview>
      
      <br/><br/>
      
      <asp:label id="MessageLabel"
          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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [Address], [City], [Region], [PostalCode], [Country], [HireDate], [PhotoPath] From [Employees]"
        updatecommand="Update [Employees] Set [LastName]=@LastName, [FirstName]=@FirstName, [Title]=@Title, [Address]=@Address, [City]=@City, [Region]=@Region, [PostalCode]=@PostalCode, [Country]=@Country Where [EmployeeID]=@EmployeeID"
        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 EmployeeFormView_ItemUpdated(ByVal sender As Object, ByVal e As FormViewUpdatedEventArgs) Handles EmployeeFormView.ItemUpdated

    ' 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("EmployeeID").ToString()

        ' Display a confirmation message.
        MessageLabel.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.
        MessageLabel.Text = "An error occurred during the update operation."

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

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

      e.KeepInEditMode = True
    
    End If
    
  End Sub

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

    MessageLabel.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
    
      MessageLabel.Text &= "Old Value=" & oldValues(i).ToString() & _
        ", New Value=" & newValues(i).ToString() & "<br/>"
    Next

    MessageLabel.Text &= "</br>"

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>FormViewUpdatedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>FormViewUpdatedEventArgs Example</h3>
                       
      <asp:formview id="EmployeeFormView"
        datasourceid="EmployeeSource"
        allowpaging="true"
        datakeynames="EmployeeID"
        emptydatatext="No employees found."
        runat="server">
        
        <itemtemplate>
          <table>
            <tr>
              <td rowspan="6">
                <asp:image id="EmployeeImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td colspan="2">
                  &nbsp; 
              </td>
            </tr>
            <tr>
              <td>
                <b>Name:</b>
              </td>
              <td>
                <%# Eval("FirstName") %> <%# Eval("LastName") %>
              </td>
            </tr>
            <tr>
              <td>
                <b>Title:</b>
              </td>
              <td>
                <%# Eval("Title") %>
              </td>
            </tr>
            <tr>
              <td>
                <b>Hire Date:</b>                 
              </td>
              <td>
                <%# Eval("HireDate","{0:d}") %>
              </td>
            </tr>
            <tr style="height:150" valign="top">
              <td>
                <b>Address:</b>
              </td>
              <td>
                <%# Eval("Address") %><br/>
                <%# Eval("City") %> <%# Eval("Region") %>
                <%# Eval("PostalCode") %><br/>
                <%# Eval("Country") %>   
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:linkbutton id="Edit"
                  text="Edit"
                  commandname="Edit"
                  runat="server"/> 
              </td>
            </tr>
          </table>       
        </itemtemplate>
        <edititemtemplate>
          <table>
            <tr>
              <td rowspan="6">
                <asp:image id="EmployeeEditImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td colspan="2">
                  &nbsp; 
              </td>
            </tr>
            <tr>
              <td>
                <b><asp:Label runat="server" 
                  AssociatedControlID="FirstNameUpdateTextBox" 
                  Text="Name" />:</b>
              </td>
              <td>
                <asp:textbox id="FirstNameUpdateTextBox"
                  text='<%# Bind("FirstName") %>'
                  accesskey="n" tabindex="1" runat="server"/>
                <asp:textbox id="LastNameUpdateTextBox"
                  text='<%# Bind("LastName") %>'
                  accesskey="l" tabindex="2" runat="server"/>
              </td>
            </tr>
            <tr>
              <td>
                <b><asp:Label runat="server" 
                  AssociatedControlID="TitleUpdateTextBox" 
                  Text="Title" />:</b>
              </td>
              <td>
                <asp:textbox id="TitleUpdateTextBox"
                  text='<%# Bind("Title") %>'
                  accesskey="t" tabindex="3" runat="server"/> 
              </td>
            </tr>
            <tr>
                <b><asp:Label runat="server" 
                  AssociatedControlID="HireDateUpdateTextBox" 
                  Text="Hire Date" />:</b>
              <td>
                <asp:textbox id="HireDateUpdateTextBox"
                  text='<%# Bind("HireDate", "{0:d}") %>'
                  accesskey="h" tabindex="4" runat="server" />
              </td>
            </tr>
            <tr style="height:150" valign="top">
              <td>
                <b><asp:Label runat="server" 
                  AssociatedControlID="AddressUpdateTextBox" 
                  Text="Address" />:</b>
              </td>
              <td>
                <asp:textbox id="AddressUpdateTextBox"
                  text='<%# Bind("Address") %>'
                  accesskey="a" tabindex="5" runat="server"/>
                <br/>
                <asp:textbox id="CityUpdateTextBox"
                  text='<%# Bind("City") %>'
                  accesskey="c" tabindex="6" runat="server"/> 
                <asp:textbox id="RegionUpdateTextBox"
                  text='<%# Bind("Region") %>'
                  width="40"
                  accesskey="r" tabindex="7" runat="server"/>
                <asp:textbox id="PostalCodeUpdateTextBox"
                  text='<%# Bind("PostalCode") %>'
                  width="60"
                  accesskey="p" tabindex="8" runat="server"/>
                <br/>
                <asp:textbox id="CountryUpdateTextBox"
                  text='<%# Bind("Country") %>'
                  accesskey="u" tabindex="9" runat="server"/> 
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:linkbutton id="UpdateButton"
                  text="Update" tabindex="10" 
                  commandname="Update"
                  runat="server"/>
                <asp:linkbutton id="CancelButton"
                  text="Cancel" tabindex="11" 
                  commandname="Cancel"
                  runat="server"/> 
              </td>
            </tr>
          </table>       
        </edititemtemplate>
                  
      </asp:formview>
      
      <br/><br/>
      
      <asp:label id="MessageLabel"
          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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [Address], [City], [Region], [PostalCode], [Country], [HireDate], [PhotoPath] From [Employees]"
        updatecommand="Update [Employees] Set [LastName]=@LastName, [FirstName]=@FirstName, [Title]=@Title, [Address]=@Address, [City]=@City, [Region]=@Region, [PostalCode]=@PostalCode, [Country]=@Country Where [EmployeeID]=@EmployeeID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
            
    </form>
  </body>
</html>

Hinweise

Das FormView -Steuerelement ItemUpdated löst das-Ereignis aus, FormView wenn auf eine Aktualisierungs Schaltfläche (eine Schaltfläche, deren CommandName -Eigenschaft auf "Update" festgelegt ist) im-Steuerelement geklickt wirdThe FormView control raises the ItemUpdated event when an Update button (a button with its CommandName property set to "Update") within the control is clicked, but after the FormView control updates the record. Dies ermöglicht es Ihnen, eine Ereignis Behandlungsmethode bereitzustellen, die eine benutzerdefinierte Routine ausführt, z. b. das Überprüfen der Ergebnisse eines Update Vorgangs, wenn dieses Ereignis auftritt.This allows you to provide an event-handling method that performs a custom routine, such as checking the results of an update operation, whenever this event occurs.

Ein FormViewUpdatedEventArgs -Objekt wird an die Ereignis Behandlungsmethode übermittelt, mit der Sie die Anzahl der betroffenen Datensätze und ggf. aufgetretenen Ausnahmen ermitteln können.A FormViewUpdatedEventArgs object is passed to the event-handling method, which allows you to determine the number of records affected and any exceptions that might have occurred. Verwenden Sie die AffectedRows -Eigenschaft, um die Anzahl der vom Aktualisierungs Vorgang betroffenen Datensätze zu bestimmen.To determine the number of records affected by the update operation, use the AffectedRows property. Verwenden Sie Exception die-Eigenschaft, um zu bestimmen, ob Ausnahmen aufgetreten sind.Use the Exception property to determine whether any exceptions occurred. Sie können auch angeben, ob die Ausnahme in der Ereignis Behandlungsmethode behandelt wurde, indem Sie ExceptionHandled die-Eigenschaft festlegen.You can also indicate whether the exception was handled in the event-handling method by setting the ExceptionHandled property. Wenn Sie auf die ursprünglichen Schlüssel Feldwerte für den aktualisierten Datensatz zugreifen müssen, verwenden Sie Keys die-Eigenschaft.If you need to access the original key field values for the updated record, use the Keys property. Auf die ursprünglichen nicht-Schlüssel Feldwerte kann mithilfe der OldValues -Eigenschaft zugegriffen werden.The original non-key field values can be accessed by using the OldValues property. Aktualisierte Werte (die aktualisierte Schlüssel Feldwerte einschließen, wenn Sie dem Benutzer das Bearbeiten von Schlüsselfeldern gestatten) werden über die NewValues -Eigenschaft aufgerufen.Updated values (which include updated key field values, if you allow the user to edit key fields) are accessed using the NewValues property.

Standardmäßig wird das FormView -Steuerelement nach einem Aktualisierungs Vorgang DefaultMode in den von der-Eigenschaft angegebenen Modus zurückgegeben.By default, the FormView control returns to the mode specified by the DefaultMode property after an update operation. Bei der Behandlung einer Ausnahme, die während des Aktualisierungs Vorgangs aufgetreten ist, FormView können Sie das Steuerelement im Bearbeitungs KeepInEditMode Modus belassen true, indem Sie die-Eigenschaft auf festlegen.When handling an exception that occurred during the update operation, you can keep the FormView control in edit mode by setting the KeepInEditMode property to true.

Weitere Informationen zum Behandeln von Ereignissen finden Sie unter behandeln und Auslösen von Ereignissen.For more information about how to handle events, see Handling and Raising Events.

Eine Liste der anfänglichen Eigenschaftenwerte für eine Instanz der FormViewUpdatedEventArgs-Klasse finden Sie im FormViewUpdatedEventArgs-Konstruktor.For a list of initial property values for an instance of the FormViewUpdatedEventArgs class, see the FormViewUpdatedEventArgs constructor.

Konstruktoren

FormViewUpdatedEventArgs(Int32, Exception) FormViewUpdatedEventArgs(Int32, Exception) FormViewUpdatedEventArgs(Int32, Exception) FormViewUpdatedEventArgs(Int32, Exception)

Initialisiert eine neue Instanz der FormViewUpdatedEventArgs-Klasse.Initializes a new instance of the FormViewUpdatedEventArgs class.

Eigenschaften

AffectedRows AffectedRows AffectedRows AffectedRows

Ruft die Anzahl der vom Aktualisierungsvorgang betroffenen Zeilen ab.Gets the number of rows affected by the update operation.

Exception Exception Exception Exception

Ruft die Ausnahme (sofern vorhanden) ab, die während des Aktualisierungsvorgangs ausgelöst wurde.Gets the exception (if any) that was raised during the update operation.

ExceptionHandled ExceptionHandled ExceptionHandled ExceptionHandled

Ruft einen Wert ab, der angibt, ob während der Behandlung des Aktualisierungsvorgangs im Ereignishandler eine Ausnahme ausgelöst wurde, oder legt diesen fest.Gets or sets a value indicating whether an exception that was raised during the update operation was handled in the event handler.

KeepInEditMode KeepInEditMode KeepInEditMode KeepInEditMode

Ruft einen Wert ab, der anzeigt, ob das FormView-Steuerelement nach einem Aktualisierungsvorgang im Bearbeitungsmodus belassen werden soll, oder legt diesen Wert fest.Gets or sets a value indicating whether the FormView control should remain in edit mode after an update operation.

Keys Keys Keys Keys

Ruft ein Wörterbuch ab, das die ursprünglichen Name-Wert-Paare von Schlüsselfeldern für den aktualisierten Datensatz enthält.Gets a dictionary that contains the original key field name/value pairs for the updated record.

NewValues NewValues NewValues NewValues

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.

OldValues OldValues OldValues OldValues

Ruft ein Wörterbuch ab, das die ursprünglichen Name-Wert-Paare von Nicht-Schlüsselfeldern für den aktualisierten Datensatz enthält.Gets a dictionary that contains the original non-key field name/value pairs for the updated record.

Methoden

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Bestimmt, ob das angegebene Objekt mit dem aktuellen Objekt identisch ist.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Fungiert als Standardhashfunktion.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Ruft den Type der aktuellen Instanz ab.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Erstellt eine flache Kopie des aktuellen Object.Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Gibt eine Zeichenfolge zurück, die das aktuelle Objekt darstellt.Returns a string that represents the current object.

(Inherited from Object)

Gilt für:

Siehe auch