ObjectDataSource.DeleteMethod ObjectDataSource.DeleteMethod ObjectDataSource.DeleteMethod ObjectDataSource.DeleteMethod Property

定义

获取或设置由 ObjectDataSource 控件调用以删除数据的方法或函数的名称。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

属性值

一个字符串,表示 ObjectDataSource 用于删除数据的方法或函数的名称。A string that represents the name of the method or function that the ObjectDataSource uses to delete data. 默认值为空字符串("")。The default is an empty string ("").

示例

本部分包含两个代码示例。This section contains two code examples. 第一个代码示例演示如何将ObjectDataSource对象与业务对象GridView和控件结合使用来删除数据。The first code example demonstrates how to use an ObjectDataSource object with a business object and a GridView control to delete data. 第二个代码示例演示EmployeeLogic了第一个代码示例中使用的类。The second code example shows the EmployeeLogic class that is used in the first code example.

下面的代码示例演示如何将ObjectDataSource控件与业务对象GridView和控件结合使用来删除数据。The following code example demonstrates how to use an ObjectDataSource control with a business object and a GridView control to delete data. 最初, GridView控件使用SelectMethod由属性指定的方法来显示EmployeeLogic对象中的数据, 以显示一组所有雇员。Initially, 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. 由于属性设置为true, 因此该控件会GridView自动显示 "删除" 按钮。 AutoGenerateDeleteButtonBecause the AutoGenerateDeleteButton property is set to true, the GridView control automatically displays a Delete button.

如果单击 "删除" 按钮, 则将使用DeleteMethod属性指定的方法和DeleteParameters集合中指定的任何参数来执行删除操作。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. 在此代码示例中, 还执行了一些预处理和后处理步骤。In this code example, some preprocessing and post-processing steps are also performed. NorthwindEmployeeDeleting执行操作之前调用委托来Deleting处理事件, 并在NorthwindEmployeeDeleted操作完成后调用委托来处理Deleted事件以执行异常处理。The 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. 在此示例中, 如果NorthwindDataException引发了, 则NorthwindDataException由委托进行处理。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>

下面的代码示例演示EmployeeLogic了前面的代码示例中使用的类。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

注解

假定业务对象每次删除一条记录, 而不是成批删除数据。The business object is assumed to delete data one record at a time, rather than in a batch.

属性委托ObjectDataSourceView DeleteMethod给与ObjectDataSource控件相关联的对象的属性。 DeleteMethodThe DeleteMethod property delegates to the DeleteMethod property of the ObjectDataSourceView object that is associated with the ObjectDataSource control.

请确保为ObjectDataSource DeleteParameters集合中的控件配置的参数名称与 select 方法返回的列名称相匹配。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.

对象生存期Object Lifetime

DeleteMethod属性标识的方法可以是实例方法, static也可以是 (Shared在 Visual Basic) 方法。The method that is identified by the DeleteMethod property can be an instance method or a static (Shared in Visual Basic) method. 如果它是实例方法, 则每次DeleteMethod调用属性时都会创建并销毁业务对象。If it is an instance method, the business object is created and destroyed each time the DeleteMethod property is called. 您可以处理ObjectCreatedObjectCreating事件, 在调用DeleteMethod属性之前使用业务对象。You can handle the ObjectCreated and ObjectCreating events to work with the business object before the DeleteMethod property is called. 还可以处理在调用ObjectDisposing DeleteMethod属性后引发的事件。You can also handle the ObjectDisposing event that is raised after the DeleteMethod property is called. 如果业务对象实现IDisposable接口Dispose , 则在销毁对象之前调用方法。If the business object implements the IDisposable interface, the Dispose method is called before the object is destroyed. 如果该方法是一个static (Shared在 Visual Basic) 方法中, 则永远不会创建业务对象, 也不ObjectCreatedObjectCreating处理、 ObjectDisposing和事件。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.

参数合并Parameter Merging

将参数添加到集合DeleteParameters中的三个源:Parameters are added to the DeleteParameters collection from three sources:

  • 在运行时从数据绑定控件。From the data-bound control, at run time.

  • DeleteParameters从元素中以声明方式。From the DeleteParameters element, declaratively.

  • Deleting从方法以声明方式。From the Deleting method, declaratively.

首先, 将从数据绑定控件生成的所有参数添加到DeleteParameters集合中。First, any parameters that are generated from data-bound controls are added to the DeleteParameters collection. ObjectDataSource例如, 如果将控件绑定GridView到具有Name Number Number列和的控件, 则和的参数将添加到集合中。NameFor 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. 参数的确切名称取决于OldValuesParameterFormatString属性。The exact name of the parameter depends on the OldValuesParameterFormatString property. 这些参数的数据类型为stringThe data type of these parameters is string. 接下来, 添加DeleteParameters元素中列出的参数。Next, the parameters that are listed in the DeleteParameters element are added. 如果找到了DeleteParameters元素中与DeleteParameters集合中已有的参数同名的参数, 则会修改现有参数, 使其与DeleteParameters元素中指定的参数匹配。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. 通常, 这用于修改参数中数据的类型。Typically, this is used to modify the type of the data in the parameter. 最后, 你可以通过编程方式在运行Deleting Delete方法之前, 在事件中添加和移除参数。Finally, you can programmatically add and remove parameters in the Deleting event, which occurs before the Delete method is run. 合并参数后, 解析方法。The method is resolved after the parameters are merged. 下一节将讨论方法解析。Method resolution is discussed in the next section.

方法解析Method Resolution

调用方法时, 数据绑定控件中的数据字段、在DeleteParameters元素中以声明方式创建的参数以及在Deleting事件处理程序中添加的参数都将合并。 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. (有关详细信息, 请参阅前面的部分。)然后ObjectDataSource , 对象会尝试查找要调用的方法。(For more information, see the preceding section.) The ObjectDataSource object then attempts to find a method to call. 首先, 它会查找一个或多个具有在DeleteMethod属性中指定的名称的方法。First, it looks for one or more methods with the name that is specified in the DeleteMethod property. 如果未找到匹配项, InvalidOperationException则会引发异常。If no match is found, an InvalidOperationException exception is thrown. 如果找到匹配项, 则它将查找匹配的参数名称。If a match is found, it then looks for matching parameter names. 例如, 假设TypeName属性指定的类型有两个名为DeleteARecord的方法。For example, suppose the type that is specified by the TypeName property has two methods named DeleteARecord. 一个DeleteARecord DeleteARecord 参数为,另Name一个参数Number具有两个参数: 和。 IDOne DeleteARecord has one parameter, ID, and the other DeleteARecord has two parameters, Name and Number. 如果集合仅包含一个名为ID的参数, DeleteARecord则将调用只ID包含参数的方法。 DeleteParametersIf the DeleteParameters collection has only one parameter named ID, the DeleteARecord method with just the ID parameter is called. 解析方法时未检查参数类型。The type of the parameter is not checked in resolving the methods. 参数的顺序并不重要。The order of the parameters does not matter.

如果设置了属性, 则会以不同的方式解析方法。 DataObjectTypeNameIf the DataObjectTypeName property is set, the method is resolved in a different way. 查找具有在属性中指定的名称的方法, 该属性采用在DataObjectTypeName属性中指定的类型的一个参数。 DeleteMethod 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. 在这种情况下, 参数名称并不重要。In this case, the name of the parameter does not matter.

适用于

另请参阅