ObjectDataSourceStatusEventArgs Klasse

Definition

Stellt Daten für die Ereignisse Selected, Inserted, Updated und Deleted des ObjectDataSource-Steuerelements bereit.Provides data for the Selected, Inserted, Updated, and Deleted events of the ObjectDataSource control.

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

Beispiele

Dieser Abschnitt enthält zwei Codebeispiele.This section contains two code examples. Im ersten Codebeispiel wird veranschaulicht, wie ein ObjectDataSource -Steuerelement mit einem Geschäftsobjekt GridView und einem-Steuerelement verwendet wird, um Daten zu löschen.The first code example demonstrates how to use an ObjectDataSource control with a business object and a GridView control to delete data. Im zweiten Codebeispiel wird ein Beispiel für ein Geschäftsobjekt der mittleren Ebene bereitstellt, das im ersten Codebeispiel verwendet wird.The second code example provides an example middle-tier business object that the first code example uses.

Im folgenden Codebeispiel wird veranschaulicht, wie ein ObjectDataSource -Steuerelement mit einem Geschäftsobjekt GridView und einem-Steuerelement verwendet wird, um Daten zu löschen.The following code example demonstrates how to use an ObjectDataSource control with a business object and a GridView control to delete data. Das GridView zeigt anfänglich eine Menge aller Mitarbeiter an und verwendet dabei die-Methode, die SelectMethod von der-Eigenschaft angegeben wird, EmployeeLogic um die Daten aus dem-Objekt abzurufen.The GridView initially displays a set of all employees, using the method that is specified by the SelectMethod property to retrieve the data from the EmployeeLogic object. Da die AutoGenerateDeleteButton -Eigenschaft auf fest truegelegt ist GridView , zeigt das-Steuerelement automatisch eine Lösch Schaltfläche an.Because the AutoGenerateDeleteButton property is set to true, the GridView control automatically displays a Delete button.

Wenn Sie auf die **** Schaltfläche "Löschen Delete " klicken, wird die Aktion mit der von der DeleteMethod -Eigenschaft angegebenen Methode und allen in der DeleteParameters -Auflistung angegebenen Parametern ausgeführt.If you click the Delete button, the Delete action is performed using the method that is specified by the DeleteMethod property and any parameters that are specified in the DeleteParameters collection. In diesem Codebeispiel wird ein Parameter in der DeleteParameters -Auflistung angegeben, der der Mitarbeiter-ID entspricht.In this code example, one parameter is specified in the DeleteParameters collection that corresponds to the employee ID. Dies liegt daran, dass zwar die ID in der Columns Auflistung BoundField als-Objekt enthalten ist, Sie jedoch als Zeichenfolge an das ObjectDataSource -Steuerelement übermittelt wird.This is because although the ID is included in the Columns collection as a BoundField object, it will be passed as a string to the ObjectDataSource control. DeleteParameters Durch das Type Int32 explizite Hinzufügenzur-Auflistungmiteiner-Eigenschaft,dieaufden-Wertfestgelegtist,wirdSievonordnungsgemäßandie-MethodealsganzeZahlundnichtalsZeichenfolgeübergeben.ObjectDataSourceBy adding it explicitly to the DeleteParameters collection with a Type property set to the Int32 value, it will pass correctly by the ObjectDataSource to the method as an integer, rather than as string.

In diesem Codebeispiel werden auch einige Schritte zur Vorverarbeitung und Nachbearbeitung ausgeführt.In this code example, some preprocessing and post-processing steps are also performed. Der NorthwindEmployeeDeleting Delegat wird aufgerufen, um Deleting das Ereignis zu Delete behandeln, bevor die Aktion ausgeführt NorthwindEmployeeDeleted wird, und der Delegat Deleted wird aufgerufen, Delete um das Ereignis zu behandeln, nachdem die Aktion abgeschlossen wurde, um beliebige Ausnahmen, die möglicherweise aufgetreten sind.The NorthwindEmployeeDeleting delegate is called to handle the Deleting event before the Delete action is performed, and the NorthwindEmployeeDeleted delegate is called to handle the Deleted event after the Delete action has completed, to handle any exceptions that might have occurred. Der NorthwindEmployeeDeleted -Delegat greift auf mögliche Ausnahmen zu, die vom Geschäftsobjekt ausgelöst werden ObjectDataSourceStatusEventArgs , das das-Objekt verwendet.The NorthwindEmployeeDeleted delegate accesses possible exceptions that are thrown by the business object that is using the ObjectDataSourceStatusEventArgs object. Wenn in diesem Beispiel eine NorthwindDataException ausgelöst wird, wird Sie von diesem Delegaten behandelt.In this example, if a NorthwindDataException is thrown, it is handled by this delegate.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS" Assembly="Samples.AspNet.CS" %>
<%@ Import namespace="Samples.AspNet.CS" %>
<%@ 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">
private void NorthwindEmployeeDeleting(object source, ObjectDataSourceMethodEventArgs e)
{
  // The GridView passes the ID of the employee
  // to be deleted. However, the buisiness object, EmployeeLogic,
  // requires a NorthwindEmployee parameter, named "ne". Create
  // it now and add it to the parameters collection.
  IDictionary paramsFromPage = e.InputParameters;
  if (paramsFromPage["EmpID"] != null) {
    NorthwindEmployee ne
      = new NorthwindEmployee( Int32.Parse(paramsFromPage["EmpID"].ToString()));
    // Remove the old EmpID parameter.
    paramsFromPage.Clear();
    paramsFromPage.Add("ne", ne);
  }
}

private void NorthwindEmployeeDeleted(object source, ObjectDataSourceStatusEventArgs e)
{
  // Handle the Exception if it is a NorthwindDataException
  if (e.Exception != null)
  {

    // Handle the specific exception type. The ObjectDataSource wraps
    // any Exceptions in a TargetInvokationException wrapper, so
    // check the InnerException property for expected Exception types.
    if (e.Exception.InnerException is NorthwindDataException)
    {
      Label1.Text = e.Exception.InnerException.Message;
      // Because the exception is handled, there is
      // no reason to throw it.
      e.ExceptionHandled = true;
    }
  }
}

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>ObjectDataSource - C# Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">

        <asp:gridview
          id="GridView1"
          runat="server"
          datasourceid="ObjectDataSource1"
          autogeneratedeletebutton="true"
          autogeneratecolumns="false"
          datakeynames="EmpID">
          <columns>
            <asp:boundfield headertext="EmpID" datafield="EmpID" />
            <asp:boundfield headertext="First Name" datafield="FirstName" />
            <asp:boundfield headertext="Last Name" datafield="LastName" />
          </columns>
        </asp:gridview>

        <asp:objectdatasource
          id="ObjectDataSource1"
          runat="server"
          selectmethod="GetAllEmployees"
          deletemethod="DeleteEmployee"
          ondeleting="NorthwindEmployeeDeleting"
          ondeleted="NorthwindEmployeeDeleted"
          typename="Samples.AspNet.CS.EmployeeLogic">
          <deleteparameters>
            <asp:parameter name="EmpID" type="Int32" />
          </deleteparameters>
        </asp:objectdatasource>

        <asp:label id="Label1" runat="server" />

    </form>
  </body>
</html>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB" Assembly="Samples.AspNet.VB" %>
<%@ Import namespace="Samples.AspNet.VB" %>
<%@ 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">
' Called before a Delete operation.
    Private Sub NorthwindEmployeeDeleting(ByVal source As Object, ByVal e As ObjectDataSourceMethodEventArgs)

        ' The GridView passes the ID of the employee
        ' to be deleted. However, the business object, EmployeeLogic,
        ' requires a NorthwindEmployee parameter, named "ne". Create
        ' it now and add it to the parameters collection.
        Dim paramsFromPage As IDictionary = e.InputParameters
  
        If Not paramsFromPage("EmpID") Is Nothing Then
    
            Dim ne As New NorthwindEmployee(paramsFromPage("EmpID").ToString())
            ' Remove the old EmpID parameter.
            paramsFromPage.Clear()
            paramsFromPage.Add("ne", ne)
    
    
        End If
    End Sub ' NorthwindEmployeeDeleting

    ' Called after a Delete operation.
    Private Sub NorthwindEmployeeDeleted(ByVal source As Object, ByVal e As ObjectDataSourceStatusEventArgs)
        ' Handle the Exception if it is a NorthwindDataException.
        If Not e.Exception Is Nothing Then

            ' Handle the specific exception type. The ObjectDataSource wraps
            ' any Exceptions in a TargetInvokationException wrapper, so
            ' check the InnerException property for the expected Exception types.
            If e.Exception.InnerException.GetType().Equals(GetType(NorthwindDataException)) Then

                Label1.Text = e.Exception.InnerException.Message
                ' Because the exception is handled, there is
                ' no reason to throw it.
                e.ExceptionHandled = True
      
            End If
        End If
    End Sub ' NorthwindEmployeeDeleted
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>ObjectDataSource - VB Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">

        <asp:gridview
          id="GridView1"
          runat="server"
          datasourceid="ObjectDataSource1"
          autogeneratedeletebutton="true"
          autogeneratecolumns="false"
          datakeynames="EmpID">
          <columns>
            <asp:boundfield headertext="EmpID" datafield="EmpID" />
            <asp:boundfield headertext="First Name" datafield="FirstName" />
            <asp:boundfield headertext="Last Name" datafield="LastName" />
          </columns>
        </asp:gridview>

        <asp:objectdatasource
          id="ObjectDataSource1"
          runat="server"
          selectmethod="GetAllEmployees"
          deletemethod="DeleteEmployee"
          ondeleting="NorthwindEmployeeDeleting"
          ondeleted="NorthwindEmployeeDeleted"
          typename="Samples.AspNet.VB.EmployeeLogic">
          <deleteparameters>
            <asp:parameter name="EmpID" type="Int32" />
          </deleteparameters>
        </asp:objectdatasource>

        <asp:label id="Label1" runat="server" />

    </form>
  </body>
</html>

Im folgenden Codebeispiel wird ein Beispiel für ein Geschäftsobjekt der mittleren Ebene bereitstellt, das im vorangehenden Codebeispiel verwendet wird.The following code example provides an example middle-tier business object that the preceding code example uses. In der folgenden Liste werden die beiden Hauptklassen beschrieben, die im Codebeispiel definiert sind:The following list describes the two major classes that are defined in the code example:

  • Bei EmployeeLogic der-Klasse handelt es sich um eine Klasse, die den Zustand nicht aufrecht erhält und Geschäftslogik kapselt.The EmployeeLogic class is a class that does not maintain state and encapsulates business logic.

  • Bei NorthwindEmployee der-Klasse handelt es sich um eine Modell Klasse, die nur die grundlegenden Funktionen enthält, die zum Laden und Speichern von Daten aus der Datenebene erforderlich sind.The NorthwindEmployee class is a model class that contains only the basic functionality that is required to load and persist data from the data tier.

Außerdem wird eine NorthwindDataException Klasse als praktische Bereitstellung bereitgestellt.In addition, a NorthwindDataException class is provided as a convenience.

In diesem Satz von Beispiel Klassen wird die Datenbank Northwind Traders verwendet, bei der es sich um eine Beispieldatenbank handelt, die mit Microsoft SQL Server und Microsoft Access verfügbar ist.This set of example classes uses the Northwind Traders database, which is an example database that is available with Microsoft SQL Server and Microsoft Access. Für ein umfassendes Beispiel müssen Sie diesen Code als Bibliothek kompilieren und diese Klassen dann von einer ASP-Seite verwenden.For a complete working example, you must compile this code as a library, and then use these classes from an ASP page. Die im vorherigen Beispiel bereitgestellte ASP-Seite ist so konfiguriert, dass Sie mit dieser Klassenbibliothek funktioniert.The ASP page that is provided in the preceding example is configured to work with this class library. Die UpdateEmployeeInfo -Methode ist nicht vollständig implementiert, sodass Sie keine Daten in die Northwind Traders-Datenbank einfügen, wenn Sie mit diesem Beispiel experimentieren.The UpdateEmployeeInfo method is not completely implemented, so you will not insert data into the Northwind Traders database when you experiment with this example.

namespace Samples.AspNet.CS {

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web.UI;
using System.Web.UI.WebControls;
  //
  // EmployeeLogic is a stateless business object that encapsulates
  // the operations you can perform on a NorthwindEmployee object.
  //
  public class EmployeeLogic {

    // Returns a collection of NorthwindEmployee objects.
    public static ICollection GetAllEmployees () {
      ArrayList al = new ArrayList();

      // Use the SqlDataSource class to wrap the
      // ADO.NET code required to query the database.
      ConnectionStringSettings cts = ConfigurationManager.ConnectionStrings["NorthwindConnection"];

      SqlDataSource sds
        = new SqlDataSource(cts.ConnectionString,
                            "SELECT EmployeeID FROM Employees");
      try {
        IEnumerable IDs = sds.Select(DataSourceSelectArguments.Empty);

        // Iterate through the Enumeration and create a
        // NorthwindEmployee object for each ID.
        IEnumerator enumerator = IDs.GetEnumerator();
        while (enumerator.MoveNext()) {
          // The IEnumerable contains DataRowView objects.
          DataRowView row = enumerator.Current as DataRowView;
          string id = row["EmployeeID"].ToString();
          NorthwindEmployee nwe = new NorthwindEmployee(id);
          // Add the NorthwindEmployee object to the collection.
          al.Add(nwe);
        }
      }
      finally {
        // If anything strange happens, clean up.
        sds.Dispose();
      }

      return al;
    }

    public static NorthwindEmployee GetEmployee(object anID) {
      return new NorthwindEmployee(anID);
    }

    public static void DeleteEmployee(NorthwindEmployee ne) {
      bool retval = ne.Delete();
      if (! retval) { throw new NorthwindDataException("Employee delete failed."); }
      // Delete the object in memory.
      ne = null;
    }

    public static void DeleteEmployeeByID(int anID) {
        NorthwindEmployee tempEmp = new NorthwindEmployee(anID);
        DeleteEmployee(tempEmp);
    }
  }

  public class NorthwindEmployee {

    public NorthwindEmployee () {
      ID = DBNull.Value;
      lastName = "";
      firstName = "";
    }

    public NorthwindEmployee (object anID) {
      this.ID = anID;

      ConnectionStringSettings cts = ConfigurationManager.ConnectionStrings["NorthwindConnection"];

      SqlConnection conn = new SqlConnection (cts.ConnectionString);
      SqlCommand sc =
        new SqlCommand(" SELECT FirstName,LastName " +
                       " FROM Employees " +
                       " WHERE EmployeeID = @empId",
                       conn);
      // Add the employee ID parameter and set its value.
      sc.Parameters.Add(new SqlParameter("@empId",SqlDbType.Int)).Value = Int32.Parse(anID.ToString());
      SqlDataReader sdr = null;

      try {
        conn.Open();
        sdr = sc.ExecuteReader();

        // This is not a while loop. It only loops once.
        if (sdr != null && sdr.Read()) {
          // The IEnumerable contains DataRowView objects.
          this.firstName        = sdr["FirstName"].ToString();
          this.lastName         = sdr["LastName"].ToString();
        }
        else {
          throw new NorthwindDataException("Data not loaded for employee id.");
        }
      }
      finally {
        try {
          if (sdr != null) sdr.Close();
          conn.Close();
        }
        catch (SqlException) {
          // Log an event in the Application Event Log.
          throw;
        }
      }
    }

    private object ID;
    public object EmpID {
      get { return ID; }
    }

    private string lastName;
    public string LastName {
      get { return lastName; }
      set { lastName = value; }
    }

    private string firstName;
    public string FirstName {
      get { return firstName; }
      set { firstName = value;  }
    }
    public bool Delete () {
      if (ID.Equals(DBNull.Value)) {
        // The Employee object is not persisted.
        return true;
      }
      else {
        // The Employee object is persisted.
        // Use the SqlDataSource control as a convenient wrapper for
        // the ADO.NET code needed to delete a record from the database.
        ConnectionStringSettings cts = ConfigurationManager.ConnectionStrings["NorthwindConnection"];
        SqlDataSource sds = new SqlDataSource();

        try {
          sds.ConnectionString = cts.ConnectionString;
          sds.DeleteParameters.Add(new Parameter("empID", TypeCode.Int32, this.ID.ToString()));
          sds.DeleteCommand = "DELETE FROM [Order Details] " + 
              "WHERE OrderID IN (SELECT OrderID FROM Orders WHERE EmployeeID=@empID)";
          sds.Delete();
          sds.DeleteCommand = "DELETE FROM Orders WHERE EmployeeID=@empID";
          sds.Delete();
          sds.DeleteCommand = "DELETE FROM EmployeeTerritories WHERE EmployeeID=@empID";
          sds.Delete();
          sds.DeleteCommand = "DELETE FROM Employees WHERE EmployeeID=@empID";
          sds.Delete();
          return true;
        }
        finally {
          // Clean up resources.
          sds.Dispose();
        }
      }
    }
  }

  public class NorthwindDataException: Exception {
    public NorthwindDataException(string msg) : base (msg) { }
  }
}
Imports System.Collections
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.UI
Imports System.Web.UI.WebControls

Namespace Samples.AspNet.VB
'
' EmployeeLogic is a stateless business object that encapsulates
' the operations you can perform on a NorthwindEmployee object.
Public Class EmployeeLogic

   ' Return a collection of NorthwindEmployee objects.
   Public Shared Function GetAllEmployees() As ICollection
      Dim al As New ArrayList()

      ' Use the SqlDataSource class to wrap the
      ' ADO.NET code required to query the database.
      Dim cts As ConnectionStringSettings = ConfigurationManager.ConnectionStrings("NorthwindConnection")
      Dim sds As New SqlDataSource(cts.ConnectionString, _
                                  "SELECT EmployeeID FROM Employees")
      Try
         Dim IDs As IEnumerable = sds.Select(DataSourceSelectArguments.Empty)

         ' Iterate through the Enumeration and create a
         ' NorthwindEmployee object for each ID.
         Dim enumerator As IEnumerator = IDs.GetEnumerator()
         While enumerator.MoveNext()
            ' The IEnumerable contains DataRowView objects.
            Dim row As DataRowView = CType(enumerator.Current,DataRowView)
            Dim id As String = row("EmployeeID").ToString()
            Dim nwe As New NorthwindEmployee(id)
            ' Add the NorthwindEmployee object to the collection.
            al.Add(nwe)
         End While
      Finally
         ' If anything strange happens, clean up.
         sds.Dispose()
      End Try

      Return al
   End Function 'GetAllEmployees


   Public Shared Function GetEmployee(anID As Object) As NorthwindEmployee
      Return New NorthwindEmployee(anID)
   End Function 'GetEmployee


   Public Shared Sub DeleteEmployee(ne As NorthwindEmployee)
      Dim retval As Boolean = ne.Delete()
      If Not retval Then
         Throw New NorthwindDataException("Employee delete failed.")
      End If ' Delete the object in memory.
      ne = Nothing
   End Sub


   Public Shared Sub DeleteEmployeeByID(anID As Integer)
      Dim tempEmp As New NorthwindEmployee(anID)
      DeleteEmployee(tempEmp)
   End Sub

End Class

Public Class NorthwindEmployee

   Public Sub New()
      ID = DBNull.Value
      aLastName = ""
      aFirstName = ""
   End Sub


   Public Sub New(anID As Object)
      Me.ID = anID
      Dim cts As ConnectionStringSettings = ConfigurationManager.ConnectionStrings("NorthwindConnection")
      Dim conn As New SqlConnection(cts.ConnectionString)
      Dim sc As New SqlCommand(" SELECT FirstName,LastName " & _
                               " FROM Employees " & _
                               " WHERE EmployeeID = @empId", conn)
      ' Add the employee ID parameter and set its value.
      sc.Parameters.Add(New SqlParameter("@empId", SqlDbType.Int)).Value = Int32.Parse(anID.ToString())
      Dim sdr As SqlDataReader = Nothing

      Try
         conn.Open()
         sdr = sc.ExecuteReader()

         ' This is not a while loop. It only loops once.
         If Not (sdr Is Nothing) AndAlso sdr.Read() Then
            ' The IEnumerable contains DataRowView objects.
            Me.aFirstName = sdr("FirstName").ToString()
            Me.aLastName = sdr("LastName").ToString()
         Else
            Throw New NorthwindDataException("Data not loaded for employee id.")
         End If
      Finally
         Try
            If Not (sdr Is Nothing) Then
               sdr.Close()
            End If
            conn.Close()
         Catch se As SqlException
            ' Log an event in the Application Event Log.
            Throw
         End Try
      End Try
   End Sub

   Private ID As Object
   Public ReadOnly Property EmpID() As Object
      Get
         Return ID
      End Get
   End Property

   Private aLastName As String
   Public Property LastName() As String
      Get
         Return aLastName
      End Get
      Set
         aLastName = value
      End Set
   End Property

   Private aFirstName As String
   Public Property FirstName() As String
      Get
         Return aFirstName
      End Get
      Set
         aFirstName = value
      End Set
   End Property

   Public Function Delete() As Boolean
      If ID.Equals(DBNull.Value) Then
         ' The Employee object is not persisted.
         Return True
      Else
         ' The Employee object is persisted.
         ' Use the SqlDataSource control as a convenient wrapper for
         ' the ADO.NET code needed to delete a record from the database.
         Dim cts As ConnectionStringSettings = ConfigurationManager.ConnectionStrings("NorthwindConnection")
         Dim sds As New SqlDataSource()
         Try
            sds.ConnectionString = cts.ConnectionString
            sds.DeleteParameters.Add(New Parameter("empID", TypeCode.Int32, Me.ID.ToString()))
            sds.DeleteCommand = "DELETE FROM [Order Details] " & _
                "WHERE OrderID IN (SELECT OrderID FROM Orders WHERE EmployeeID=@empID)"
            sds.Delete()
            sds.DeleteCommand = "DELETE FROM Orders WHERE EmployeeID=@empID"
            sds.Delete()
            sds.DeleteCommand = "DELETE FROM EmployeeTerritories WHERE EmployeeID=@empID"
            sds.Delete()
            sds.DeleteCommand = "DELETE FROM Employees WHERE EmployeeID=@empID"
            sds.Delete()
            Return True
         Finally
            ' Clean up resources.
            sds.Dispose()
         End Try
      End If
   End Function 'Delete
End Class

Public Class NorthwindDataException
   Inherits Exception

   Public Sub New(msg As String)
      MyBase.New(msg)
   End Sub

End Class
End Namespace

Hinweise

Die ObjectDataSourceStatusEventArgs -Klasse wird in den OnSelectedMethoden OnUpdated, OnInserted, und OnDeleted verwendet, um den Zugriff auf Ausgabeparameter, Rückgabewerte und Ausnahmen bereitzustellen, die von der Methode ausgelöst werden, die ObjectDataSource von aufgerufen wird. Steuerelement.The ObjectDataSourceStatusEventArgs class is used in the OnSelected, OnUpdated, OnInserted, and OnDeleted methods to provide access to output parameters, return values, and exceptions that are thrown by the method that is called by the ObjectDataSource control. Diese werden aufgerufen, indem die OutputParameters, ReturnValue, und Exception Eigenschaften bzw.These are accessed by the OutputParameters, ReturnValue, and Exception properties, respectively. Indem Sie einen Delegaten hinzufügen Selected, Updatedum die Ereignisse Deleted ,, Insertedoder zu behandeln, können Sie diese Daten untersuchen und alle zusätzlichen nachfolgenden Verarbeitungsschritte durchführen.By adding a delegate to handle the Selected, Updated, Inserted, or Deleted events, you can examine this data and perform any additional post processing that is required.

Das ObjectDataSource -Steuerelement macht viele Ereignisse verfügbar, die Sie verarbeiten können, um zu verschiedenen Zeitpunkten im Lebenszyklus mit dem zugrunde liegenden Geschäftsobjekt zu arbeiten.The ObjectDataSource control exposes many events that you can handle to work with the underlying business object at various times in its lifecycle. In der folgenden Tabelle werden die-Ereignisse sowie EventArgs die zugehörigen Klassen und Ereignishandlerdelegaten aufgelistet.The following table lists the events and the associated EventArgs classes and event handler delegates.

eventEvent EventArgsEventArgs EventHandlerEventHandler
ObjectCreating.ObjectCreating.

Tritt unmittelbar vor dem Erstellen der Instanz des Geschäftsobjekts auf.Occurs immediately before the instance of the business object is created.
ObjectDataSourceEventArgs ObjectDataSourceObjectEventHandler
ObjectCreated.ObjectCreated.

Tritt unmittelbar nach dem Erstellen der Instanz des Geschäftsobjekts auf.Occurs immediately after the instance of the business object is created.
ObjectDataSourceEventArgs ObjectDataSourceObjectEventHandler
Selecting.Selecting.

Tritt ein, bevor die Daten abgerufen werden.Occurs before the data is retrieved.
ObjectDataSourceSelectingEventArgs ObjectDataSourceSelectingEventHandler
Inserting, Updating und Deleting.Inserting, Updating, and Deleting.

Tritt auf, bevor ein INSERT-, Update-oder DELETE-Vorgang ausgeführt wird.Occur before an insert, update, or delete operation is performed.
ObjectDataSourceMethodEventArgs ObjectDataSourceMethodEventHandler
Selected.Selected.

Tritt ein, nachdem die Daten abgerufen wurden.Occurs after the data is retrieved.
ObjectDataSourceStatusEventArgs ObjectDataSourceStatusEventHandler
Inserted, Updated und Deleted.Inserted, Updated, and Deleted.

Tritt auf, nachdem der INSERT-, Update-oder DELETE-Vorgang abgeschlossen wurde.Occur after the insert, update, or delete operation is completed.
ObjectDataSourceStatusEventArgs ObjectDataSourceStatusEventHandler
ObjectDisposing.ObjectDisposing.

Tritt ein, bevor ein Geschäftsobjekt zerstört wird.Occurs before a business object is destroyed.
ObjectDataSourceDisposingEventArgs ObjectDataSourceDisposingEventHandler

Konstruktoren

ObjectDataSourceStatusEventArgs(Object, IDictionary)

Initialisiert eine neue Instanz der ObjectDataSourceStatusEventArgs-Klasse unter Verwendung der angegebenen Ausgabeparameter und des angegebenen Rückgabewerts.Initializes a new instance of the ObjectDataSourceStatusEventArgs class using the specified output parameters and return value.

ObjectDataSourceStatusEventArgs(Object, IDictionary, Exception)

Initialisiert eine neue Instanz der ObjectDataSourceStatusEventArgs-Klasse unter Verwendung der angegebenen Ausgabeparameter, des angegebenen Rückgabewerts und der angegebenen Ausnahme.Initializes a new instance of the ObjectDataSourceStatusEventArgs class using the specified output parameters, return value, and exception.

Eigenschaften

AffectedRows

Ruft die Anzahl der Zeilen ab, die vom Datenvorgang betroffen sind, oder legt diese fest.Gets or sets the number of rows that are affected by the data operation.

Exception

Ruft einen Wrapper für alle Ausnahmen auf, die von der Methode ausgelöst werden, die vom ObjectDataSource-Steuerelement während eines Datenvorgangs aufgerufen wird.Gets a wrapper for any exceptions that are thrown by the method that is called by the ObjectDataSource control during a data operation.

ExceptionHandled

Ruft einen Wert ab, der angibt, ob eine vom Geschäftsobjekt ausgelöste Ausnahme behandelt wurde, oder legt diesen fest.Gets or sets a value indicating whether an exception that was thrown by the business object has been handled.

OutputParameters

Ruft eine Auflistung ab, die Parameter der Geschäftsobjektmethode und ihre Werte enthält.Gets a collection that contains business object method parameters and their values.

ReturnValue

Ruft den Rückgabewert ab, der von der Geschäftsobjektmethode ggf. als Objekt zurückgegeben wird.Gets the return value that is returned by the business object method, if any, as an object.

Methoden

Equals(Object)

Ermittelt, ob das angegebene Objekt und das aktuelle Objekt gleich sind.Determines whether the specified object is equal to the current object.

(Geerbt von Object)
GetHashCode()

Dient als die Standard-HashfunktionServes as the default hash function.

(Geerbt von Object)
GetType()

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

(Geerbt von Object)
MemberwiseClone()

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

(Geerbt von Object)
ToString()

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

(Geerbt von Object)

Gilt für:

Siehe auch