ObjectDataSource.DeleteMethod Свойство

Определение

Возвращает или задает имя метода или функции, вызываемого элемента управления ObjectDataSource для удаления данных.Gets or sets the name of the method or function that the ObjectDataSource control invokes to delete data.

public:
 property System::String ^ DeleteMethod { System::String ^ get(); void set(System::String ^ value); };
public string DeleteMethod { get; set; }
member this.DeleteMethod : string with get, set
Public Property DeleteMethod As String

Значение свойства

Строка, представляющая имя метода или функции, используемых объектом ObjectDataSource для удаления данных.A string that represents the name of the method or function that the ObjectDataSource uses to delete data. Значение по умолчанию — пустая строка ("").The default is an empty string ("").

Примеры

Этот раздел содержит два примера кода.This section contains two code examples. В первом примере кода показано, как использовать ObjectDataSource объект с бизнес-объектом GridView и элементом управления для удаления данных.The first code example demonstrates how to use an ObjectDataSource object with a business object and a GridView control to delete data. Во втором примере кода показан EmployeeLogic класс, который используется в первом примере кода.The second code example shows the EmployeeLogic class that is used in the first code example.

В следующем примере кода показано, как использовать ObjectDataSource элемент управления с бизнес-объектом GridView и элементом управления для удаления данных.The following code example demonstrates how to use an ObjectDataSource control with a business object and a GridView control to delete data. Изначально элемент управления отображает набор всех сотрудников, используя метод, заданный SelectMethod свойством, для EmployeeLogic получения данных из объекта. GridViewInitially, the GridView control displays a set of all employees, using the method that is specified by the SelectMethod property to retrieve the data from the EmployeeLogic object. Так как trueсвойствоимеетзначение, GridView элемент управления автоматически отображает кнопку Delete. AutoGenerateDeleteButtonBecause the AutoGenerateDeleteButton property is set to true, the GridView control automatically displays a Delete button.

Если нажать кнопку Удалить , операция удаления выполняется с помощью метода, указанного DeleteMethod свойством, и всех параметров, указанных в DeleteParameters коллекции.If you click the Delete button, the delete operation is performed using the method that is specified by the DeleteMethod property and any parameters that are specified in the DeleteParameters collection. В этом примере кода также выполняются некоторые этапы предварительной обработки и последующей обработки.In this code example, some preprocessing and post-processing steps are also performed. Делегат вызывается для Deleting обработки события до выполнения операции, а NorthwindEmployeeDeleted делегат вызывается для обработки Deleted события после завершения операции для выполнения обработки исключений. NorthwindEmployeeDeletingThe NorthwindEmployeeDeleting delegate is called to handle the Deleting event before the operation is performed, and the NorthwindEmployeeDeleted delegate is called to handle the Deleted event after the operation has completed to perform exception handling. В этом примере, если NorthwindDataException создается исключение, оно обрабатывается NorthwindDataException делегатом.In this example, if a NorthwindDataException is thrown, it is handled by the NorthwindDataException 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>

В следующем примере кода показан EmployeeLogic класс, который используется в предыдущем примере кода.The following code example shows the EmployeeLogic class that is used in the preceding code 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

Комментарии

Предполагается, что бизнес-объект удаляет данные по одной записи за раз, а не в пакете.The business object is assumed to delete data one record at a time, rather than in a batch.

Свойство делегирует DeleteMethod ObjectDataSource свойство ObjectDataSourceView объекта, связанного с элементом управления. DeleteMethodThe DeleteMethod property delegates to the DeleteMethod property of the ObjectDataSourceView object that is associated with the ObjectDataSource control.

Убедитесь, что имена параметров, настроенных для ObjectDataSource элемента управления DeleteParameters в коллекции, соответствуют именам столбцов, возвращаемым методом Select.Make sure that the parameter names configured for the ObjectDataSource control in the DeleteParameters collection match the column names that are returned by the select method.

Время жизни объектаObject Lifetime

Метод, идентифицируемый DeleteMethod свойством, может быть методом экземпляра static или методом (Shared в Visual Basic).The method that is identified by the DeleteMethod property can be an instance method or a static (Shared in Visual Basic) method. Если это метод экземпляра, бизнес-объект создается и уничтожается каждый раз DeleteMethod при вызове свойства.If it is an instance method, the business object is created and destroyed each time the DeleteMethod property is called. Вы можете управлять ObjectCreated событиями ObjectCreating и для работы с бизнес-объектом до DeleteMethod вызова свойства.You can handle the ObjectCreated and ObjectCreating events to work with the business object before the DeleteMethod property is called. Можно также выполнить обработку ObjectDisposing события, возникающего DeleteMethod после вызова свойства.You can also handle the ObjectDisposing event that is raised after the DeleteMethod property is called. Если бизнес-объект реализует IDisposable интерфейс Dispose , метод вызывается перед уничтожением объекта.If the business object implements the IDisposable interface, the Dispose method is called before the object is destroyed. Если метод static является методом ( ObjectCreatedShared в Visual Basic), бизнес-объект никогда не создается и вы не можете управлять событиями, ObjectCreatingи ObjectDisposing .If the method is a static (Shared in Visual Basic) method, the business object is never created and you cannot handle the ObjectCreated, ObjectCreating, and ObjectDisposing events.

Слияние параметровParameter Merging

Параметры добавляются в DeleteParameters коллекцию из трех источников:Parameters are added to the DeleteParameters collection from three sources:

  • Из элемента управления с привязкой к данным во время выполнения.From the data-bound control, at run time.

  • DeleteParameters Из элемента декларативно.From the DeleteParameters element, declaratively.

  • Deleting Из метода декларативно.From the Deleting method, declaratively.

Во-первых, все параметры, созданные из элементов управления с привязкой к данным DeleteParameters , добавляются в коллекцию.First, any parameters that are generated from data-bound controls are added to the DeleteParameters collection. Например, ObjectDataSource если элемент управления привязан GridView к элементу управления со столбцами Name и Number, параметры для Name и Number добавляются в коллекцию.For example, if the ObjectDataSource control is bound to a GridView control that has the columns Name and Number, parameters for Name and Number are added to the collection. Точное имя параметра зависит от OldValuesParameterFormatString свойства.The exact name of the parameter depends on the OldValuesParameterFormatString property. Эти параметры имеют stringтип данных.The data type of these parameters is string. Затем добавляются параметры, перечисленные в DeleteParameters элементе.Next, the parameters that are listed in the DeleteParameters element are added. Если в DeleteParameters элементе обнаружен параметр с тем же именем, что и у параметра, уже находящийся DeleteParameters в коллекции, существующий параметр изменяется в соответствии с параметром DeleteParameters , указанным в элементе.If a parameter in the DeleteParameters element is found with the same name as a parameter that is already in the DeleteParameters collection, the existing parameter is modified to match the parameter that is specified in the DeleteParameters element. Как правило, он используется для изменения типа данных в параметре.Typically, this is used to modify the type of the data in the parameter. Наконец, можно программно добавлять и удалять параметры в Deleting событии, которое происходит Delete перед выполнением метода.Finally, you can programmatically add and remove parameters in the Deleting event, which occurs before the Delete method is run. Метод разрешается после слияния параметров.The method is resolved after the parameters are merged. Разрешение метода рассматривается в следующем разделе.Method resolution is discussed in the next section.

Разрешение методаMethod Resolution

При вызове DeleteParametersметодаполя данных из элемента управления с привязкой к данным, параметры, которые были созданы декларативно в элементе, и параметры Deleting , добавленные в обработчике событий, объединяются. DeleteWhen the Delete method is called, the data fields from the data-bound control, the parameters that were created declaratively in the DeleteParameters element, and the parameters that were added in the Deleting event handler are all merged. (Дополнительные сведения см. в предыдущем разделе.) Затем ObjectDataSource объект пытается найти вызываемый метод.(For more information, see the preceding section.) The ObjectDataSource object then attempts to find a method to call. Во-первых, он ищет один или несколько методов с именем, указанным в DeleteMethod свойстве.First, it looks for one or more methods with the name that is specified in the DeleteMethod property. Если совпадений не найдено, InvalidOperationException возникает исключение.If no match is found, an InvalidOperationException exception is thrown. Если совпадение найдено, оно ищет совпадающие имена параметров.If a match is found, it then looks for matching parameter names. Например, предположим, что тип, заданный TypeName свойством, имеет два метода с именем. DeleteARecordFor example, suppose the type that is specified by the TypeName property has two methods named DeleteARecord. Одна DeleteARecord имеет один IDпараметр,, а другой DeleteARecord имеет два параметра: Name и Number.One DeleteARecord has one parameter, ID, and the other DeleteARecord has two parameters, Name and Number. Если коллекция имеет только один параметр с именем ID, DeleteARecord вызывается метод только ID с параметром. DeleteParametersIf the DeleteParameters collection has only one parameter named ID, the DeleteARecord method with just the ID parameter is called. Тип параметра не проверяется при разрешении методов.The type of the parameter is not checked in resolving the methods. Порядок параметров не имеет значения.The order of the parameters does not matter.

DataObjectTypeName Если свойство задано, метод разрешается другим способом.If the DataObjectTypeName property is set, the method is resolved in a different way. Выполняет поиск метода с именем, указанным DeleteMethod в свойстве, которое принимает один параметр типа DataObjectTypeName , указанного в свойстве. ObjectDataSourceThe ObjectDataSource looks for a method with the name that is specified in the DeleteMethod property that takes one parameter of the type that is specified in the DataObjectTypeName property. В этом случае имя параметра не имеет значения.In this case, the name of the parameter does not matter.

Применяется к

Дополнительно