c# - 使用 ObjectDataSource 和 DataObjectTypeName，如何处理只有一个 Id 参数的删除方法？

Question

如果我有一个像这样的 ObjectDataSource 设置:

<asp:ObjectDataSource 
    ID="ObjectDataSource1" 
    runat="server" 
    DataObjectTypeName="Employee"
    InsertMethod="Insert" 
    UpdateMethod="Update"
    DeleteMethod="Select" 
    TypeName="EmployeeDB">
</asp:ObjectDataSource>

和一个数据/业务对象，方法如下:

public class EmployeeDB
{
    public void Insert(Employee emp)
    public int Update(Employee emp)
    public bool Delete(int id)
}

如何让对象数据源使用带有非 Employee 对象参数的 Delete 方法？

如果这不可能，推荐的替代架构是什么？

编辑:

为了澄清，我想在我的数据/业务对象上使用方法签名，如上所示，但是如果我尝试允许将 Employee 对象传递到使用 DataObjectTypeName 的某些方法中，那么我似乎失去了能力例如，有些方法仅采用整数 ID。

如果我不使用 DataObjectTypeName，那么我必须将所有方法参数放在 ObjectDataSource 中并更改数据/业务对象上的方法以匹配，这似乎是一个糟糕的设计选择，因为随着 Employee 对象的改变，我将不得不更新这些方法中的每一个。 有没有更好的架构？

Answer 1

这是解决方案，它适用于我的更新操作，然后删除比更新容易得多:

1. 创建类来传递参数。 例如:我正在为 Usermaster 表传递参数:UserMasterDT:

   public UserMasterDT(int userid, int roleid, string Firstname, string )
   {
       this.muserid = userid;
       this.mroleid = roleid;
       this.mfirstname = Firstname;
       this.mlastname = Lastname;
   }
   
   //Here set this prop as DUMMY output variable, that u used everywhere to get   output value
   public int iRecUpdated
   {
       get { return mrecupdated; }
       set { mrecupdated = value; }
   }
   

2. 我正在将 objectdatasource 绑定(bind)到 formview 以进行更新更新。设置 objectdatasource 如下:

   <asp:ObjectDataSource ID="odsUser" runat="server" 
       TypeName="MMCTaxINTLXMLValidation.UserBLL"
       SelectMethod="GetUserRoleByUserId" 
       DataObjectTypeName="MMCTaxINTLXMLValidation.UserMasterDT"  
       OldValuesParameterFormatString="original_{0}" 
       UpdateMethod="UpdateUserWithTransaction" onupdated="odsUser_Updated">        
       <SelectParameters>
           <asp:QueryStringParameter  Name="iUId" QueryStringField="UserId" Type="Int32" 
               DefaultValue="-1" />
       </SelectParameters>
       <UpdateParameters>
           <asp:Parameter  Name="UserId" Type="Int32" ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="RoleId" Type="Int32" ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="Firstname" Type="String"  ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="Lastname" Type="String" ConvertEmptyStringToNull="true" />       
           <asp:Parameter  Name="BirthDate" Type="String" ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="MMCEmail" Type="String" ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="Homecontact" Type="String" ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="Officecontact" Type="String" ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="Cellcontact" Type="String" ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="Logon" Type="String" ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="Password" Type="String" ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="PasswordQ1" Type="String" ConvertEmptyStringToNull="true" />
           <asp:Parameter  Name="PasswordA1" Type="String" ConvertEmptyStringToNull="true" />               
       </UpdateParameters>
   </asp:ObjectDataSource>
   

   注意这里没有任何输出参数

3. 现在，IN U R BLL 在更新方法中，传递并返回 UserMasterDT 作为输入和输出。不要传递单独的参数和输出变量。编写如下代码:

   这里我传入和传出 UserMasterDT

   [System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Update, true)]
   public UserMasterDT UpdateUserWithTransaction(UserMasterDT tempuser)
   {
       int iRecUpdated = -1;
       Adapter.BeginTransaction();
   
       try
       {
           string sFlag = "UpdateUserRole";
           int iUserId = tempuser.UserId;
           int iRoleId = tempuser.RoleId;
           string sFirstname = tempuser.Firstname;
           string sLastname = tempuser.Lastname;
           int? iReturnData;
   
           //THIS OUT IS FROM MY SQL STORED PROCE NOT WITH OBJECTDATASOURCE OUT PARAMETER. IT HAS NOTHING TO DO WITH OBJECT DATA SOUCE.
           Adapter.UpdateUserRole(sFlag,iUserId,iRoleId,sFirstname,sLastname,out iReturnData);
   
           if (iReturnData == 1)
           {
               iRecUpdated = 1;
               this.Adapter.CommitTransaction();
           }
           else if (iReturnData == null)
               iRecUpdated = -1;
   
           //What ever is return, set it back to UserMasterDT's iRecUpdated prop
           tempuser.iRecUpdated = iRecUpdated;
           return tempuser;
       }
       catch (Exception ex)
       {
           if (ex != null)
           {
               Adapter.RollbackTransaction();
               //CustomEX objCUEx = new CustomEX(ex.Message, ex);
               ex = null;
               iRecUpdated = -1;    //-1 : Unexpected Error
               //What ever is return, set it back to UserMasterDT's iRecUpdated prop
               tempuser.iRecUpdated = iRecUpdated;
               return tempuser;
           }
       }
       finally
       {
           tempuser.iRecUpdated = iRecUpdated;
       }
   
       //Return tempuser back
       return tempuser;
   }
   

4. 然后在aspx.cs页面中读取UserMasterDT的属性如下:

   if (e.Exception == null)
   {
       UserMasterDT tempuser = (UserMasterDT) e.ReturnValue;
       lblMsg.Text = "Record Updated : " + tempuser.iRecUpdated.ToString();
   }
   

5. 我的存储过程是:

   set ANSI_NULLS ON
   
   create PROCEDURE [dbo].[UpdateUserRole]
   (
       @sFlag varchar(50),
       @iUserId int,
       @iRoleId int,
       @sFirstname varchar(50),
       @sLastname varchar(50),
       @iReturnData int output
   )
   as
   Begin
       Declare @errnum as int
       Declare @errseverity as int
       Declare @errstate as int
       Declare @errline as int
       Declare @errproc as nvarchar(100)
       Declare @errmsg as nvarchar(4000)
   
   
       -----------------------
       if @sFlag = upper('UPDATEUSERROLE')
       begin
           begin try
               begin tran
                   --Update User Master Table
                   UPDATE    tblUserMaster
                   SET  Firstname = @sFirstname,
                   Lastname = @sLastname,
                   WHERE UserId = @iUserId
   
                   --Update tblUserRolesTran Table
                   update  tblUserRolesTran
                   set roleid = @iRoleId
                   where Userid = @iUserId
   
               commit tran -- If commit tran execute then trancount will decrease by 1
   
               -- Return Flag 1 for update user record and role record
               SET @iReturnData = 1
   
           end try
           begin catch
               IF @@Trancount > 0
                   -- Get Error Detail In Variable
                   Select  @errnum =@@ERROR,
                   @errseverity = ERROR_SEVERITY(),
                   @errstate = ERROR_STATE(),
                   @errline = ERROR_LINE(),
                   @errproc = ERROR_PROCEDURE(),
                   @errmsg = ERROR_MESSAGE()
   
                   rollback tran
   
                   -- To see print msg, keep raise error on, else these msg will not be printed and dislayed
                   print '@errnum : ' + ltrim(str(@errnum ))
                   print '@errseverity : ' + ltrim(str(@errseverity))
                   print '@errstate : ' + ltrim(str(@errstate))
                   print '@errline : ' + ltrim(str(@errline))
                   print '@errproc : ' + @errproc
                   print '@errmsg : ' + @errmsg
   
                   --Raise error doesn't display error message below 50000
                   --So we have to create custom message and add to error table using  sp_addmessage ( so_addmessage is built-in sp)
                   --In custom error message we have line number and error message
                   Declare @custerrmsg as nvarchar(4000)
                   Select @custerrmsg =  'Proc: UpdateUserRole, Line: ' + ltrim(str(@errline)) +  ': ' + @errmsg
   
                   if (@errnum < 50000)
                       EXEC SP_ADDMESSAGE @msgnum = 50002, @severity = 16,  @msgtext = @custerrmsg, @replace = 'REPLACE'
   
   
                   --After adding custom error message we need to raise error
                   --Raise error will appear at client (.net application)
                   RAISERROR(50002,16,1)
           end catch
           end
           set nocount off
   End
   

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希望这对您有帮助。 赛拉姆