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-   -   Unable to cast object of type (http://p2p.wrox.com/showthread.php?t=65088)

galua January 7th, 2008 07:47 PM

Unable to cast object of type
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
using System.Collections;

public partial class UserDefinedFunctions
        [Microsoft.SqlServer.Server.SqlFunction(FillRowMeth odName="Obj_Row",
                                                TableDefinition = "ObjID int,ObjCategoryID int,ObjValue nvarchar(400)",
                                                DataAccess= DataAccessKind.Read)]

        public static IEnumerable Obj_IDs(SqlInt32 Data_1, SqlInt32 Data_2, SqlInt32 Data_3)
                using (SqlConnection conn = new SqlConnection("context connection=true"))
                        string sql;
                            case 1:
                             sql= @"Select Obj_ID, Obj_Categoy_ID, Obj_Value
                                    from (select ObjA_ID as Obj_ID, Obj_Category_ID, Obj_Value from dbo.function_A(12,23))A,
                                         (select ObjA_ID as Obj_ID, Obj_Category_ID, Obj_Value from dbo.function_A(15,27))B
                                    Where A.ObjA_ID= B.ObjA_ID
                                        and Obj_ID in (Select ObjB_ID from tbl_Object where Obj_CategoryID=10)";
                                sql = @"Select Obj_ID, Obj_Categoy_ID, Obj_Value from tbl_Object";

                            SqlCommand cmd = new SqlCommand(sql, conn);
                            SqlDataAdapter da = new SqlDataAdapter(cmd);
                            DataTable dt = new DataTable();
                            return dt.Rows;
                    catch (Exception ex)
                        return "";


        public static void Obj_Row(Object item, out int ObjID, out int ObjCategoryID, out string ObjValue)
            DataRow row = (DataRow)item;
            ObjID = Convert.ToInt32(row["Obj_ID"]);
            ObjCategoryID = Convert.ToInt32(row["Obj_Categoy_ID"]);
            ObjValue = row["Obj_Value"].ToString();


compile with no error. call function in SQL studio the error come

Msg 6260, Level 16, State 1, Line 1
An error occurred while getting new row from user defined Table Valued Function :
System.InvalidCastException: Unable to cast object of type 'System.Char' to type 'System.Data.DataRow'.
at UserDefinedFunctions.Object_Row(Object item, Int32& ObjID, Int32& ObjCategoryID, String& ObjValue)
when I change SQL script to simple not "nested select" it work fine. How to get out of this kind of trouble????!!!!

galua January 8th, 2008 11:17 PM

Look like I get to dead point. It's funny the code didn’t works because complex SQL script.
I'm already trying over 35 SQLs script.
Simple SQL work fine.
Complex SQL get stuck.

gbianchi January 9th, 2008 08:01 AM

Stop crossposting please!

anyway, maybe your problem is with your Query.. No matter how complex it could be, it should work...

please refer to your original post, and if you want a little more help, write a script that creates the tables and fill a little data in it and I will try it in my SQL server here..



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galua January 9th, 2008 01:31 PM

To Admin,

Please delete this topic, I'm return to my original post.


Dear Gonzalo,

I'll do it. My data little funny.


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