過程或函數「批准」預計參數「@ApproveID」，但未提供

Question

我嘗試通過下面的代碼

if (e.CommandName == "_Approve") 
     { 
      //using (SqlConnection con = DataAccess.GetConnected()) 
      using (SqlConnection con = new 
      SqlConnection(ConfigurationManager.ConnectionStrings["mydms"] 
      .ConnectionString)) 
      { 
       try 
       { 
        con.Open(); 
        int rowindex = Convert.ToInt32(e.CommandArgument); 
        GridViewRow row = (GridViewRow) 
        ((Control)e.CommandSource).NamingContainer; 
        Button Prove_Button = (Button)row.FindControl("BtnApprove"); 
        SqlCommand cmd = new SqlCommand("approve", con); 
        cmd.CommandType = CommandType.StoredProcedure; 
        cmd.CommandType = CommandType.StoredProcedure; 
        cmd.Parameters.Add(new SqlParameter("@UserID", UserID)); 
        cmd.Parameters.Add(new SqlParameter("@DocID", DocID)); 
        cmd.Parameters.Add(new SqlParameter("@ApproveID", ApproveID)); 
        int result = cmd.ExecuteNonQuery(); 
        if (result != 0) 
        { 
         GrdFileApprove.DataBind(); 
        } 
       } 

       catch 
       { 
        apfi.Text = "Not Approve"; 



       } 
       finally 
       { 
        con.Close(); 
       } 
      } 
     } 


     else if (e.CommandName == "_Reject") 
     { 
      using (SqlConnection con = new 
      SqlConnection(ConfigurationManager.ConnectionStrings 
     ["mydms"].ConnectionString)) 
      { 
       try 
       { 
        con.Open(); 
        int rowindex = Convert.ToInt32(e.CommandArgument); 
        GridViewRow row = (GridViewRow) 
        ((Control)e.CommandSource).NamingContainer; 
        LinkButton Prove_Button = (LinkButton)row.FindControl("Button1"); 
        SqlCommand cmd = new SqlCommand("sprejectapprove", con); 

        cmd.CommandType = CommandType.StoredProcedure; 
        cmd.Parameters.Add(new SqlParameter("@UserID",UserID)); 
        cmd.Parameters.Add(new SqlParameter("@DocID", DocID)); 
        cmd.Parameters.Add(new SqlParameter("@ApproveID", ApproveID)); 
        int result = cmd.ExecuteNonQuery(); 
        if (result != 0) 
        { 
         GrdFileApprove.DataBind(); 
        } 
       } 

       catch 
       { 
        apfi.Text = "Rejct"; 
       } 
       finally 
       { 
        con.Close(); 
       } 
      } 
     } 

批准文件和批准存儲過程是

@UserID int, 
    @DocID int, 
@ApproveID int 
as 
insert into Approval(UserID,DocID,ApproveID) 
VALUES(@UserID,@DocID,@ApproveID) 

和SQL有審批類型表，其中批准審批類型和批准類型有3種類型1批准2拒絕和3正在審批

並在審批已經桌子上有用戶ID，文檔ID，approveid

因此，當我調試代碼它給我的錯誤在批准部分漁獲

過程或函數「批准」需要參數「@ApproveID」，但未提供。 任何幫助，請 thanku

Answer 1

我猜ApproveID有null值。由於ADO.NET的一些瘋狂，null參數不發送。您需要：

cmd.Parameters.Add(new SqlParameter("@ApproveID", (object)ApproveID ?? DBNull.Value)); 

或簡單：

cmd.Parameters.Add("ApproveID", (object)ApproveID ?? DBNull.Value); 

或者更簡單的是，與「短小精悍」這是很容易得到它的權利：

con.Execute("approve", new { 
    UserID, DocID, ApproveID 
}, commandType: CommandType.StoredProcedure);