EntityFrameWork and TableValued Parameter - entity-framework

Question

I'm trying to call a stored procedure from EntityFramework which uses Table-value parameter.
But when I try to do function import I keep getting a warning message saying -
The function 'InsertPerson' has a parameter 'InsertPerson_TVP' at
parameter index 0 that has a data type 'table type' which is currently
not supported for the target .NET Framework version. The function was
excluded.
I did a initial search here and found few posts which says It's possible in EntityFrameWork with some work arounds and few saying it's not supported in current versions.
Does any one know a better approach or solution for this problem?

Answer 1

I ended up doing this, Please note we are working on EF DataContext(not ObjectContext)
Executing a Stored procedure with output parameter
using (DataContext context = new DataContext())
{
////Create table value parameter
DataTable dt = new DataTable();
dt.Columns.Add("Displayname");
dt.Columns.Add("FirstName");
dt.Columns.Add("LastName");
dt.Columns.Add("TimeStamp");
DataRow dr = dt.NewRow();
dr["Displayname"] = "DisplayName";
dr["FirstName"] = "FirstName";
dr["LastName"] ="LastName";
dr["TimeStamp"] = "TimeStamp";
dt.Rows.Add(dr);
////Use DbType.Structured for TVP
var userdetails = new SqlParameter("UserDetails", SqlDbType.Structured);
userdetails.Value = dt;
userdetails.TypeName = "UserType";
////Parameter for SP output
var result = new SqlParameter("ResultList", SqlDbType.NVarChar, 4000);
result.Direction = ParameterDirection.Output;
context.Database.ExecuteSqlCommand("EXEC UserImport #UserDetails, #ResultList OUTPUT", userdetails, result);
return result == null ? string.Empty : result.Value.ToString();
}
My Table-Value-Parameter (UDT Table) script looks like this:
CREATE TYPE [dbo].[UserType] AS TABLE (
[DisplayName] NVARCHAR (256) NULL,
[FirstName] NVARCHAR (256) NULL,
[LastName] NVARCHAR (256) NULL,
[TimeStamp] DATETIME NULL
)
And my store procedure begins like
CREATE PROCEDURE UserImport
-- Add the parameters for the stored procedure here
#UserDetails UserType Readonly,
#ResultList NVARCHAR(MAX) output
AS
For Stored procedure without output parameter we don't need any ouput parameter added/passed to SP.
Hope it helps some one.

Answer 2

Perhaps we could also consider the SqlQuery method:
[Invoke]
public SomeResultType GetResult(List<int> someIdList)
{
var idTbl = new DataTable();
idTbl.Columns.Add("Some_ID");
someIdList.ForEach(id => idTbl.Rows.Add(id));
var idParam = new SqlParamter("SomeParamName", SqlDbType.Structured);
idParam.TypeName = "SomeTBVType";
idParam.Value = idTbl;
// Return type will be IEnumerable<T>
var result = DbContext.Database.SqlQuery<SomeResultType>("EXEC SomeSPName, #SomeParamName", idParam);
// We can enumerate the result...
var enu = result.GetEnumerator();
if (!enu.MoveNext()) return null;
return enu.Current;
}

Answer 3

var detailTbl = new DataTable();
detailTbl.Columns.Add("DetailID");
detailTbl.Columns.Add("Qty");
txnDetails.ForEach(detail => detailTbl.Rows.Add(detail.DetailID, detail.Qty));
var userIdParam = new System.Data.SqlClient.SqlParameter("#UserID", SqlDbType.Int);
userIdParam.Value = 1;
var detailParam = new System.Data.SqlClient.SqlParameter("#Details", SqlDbType.Structured);
detailParam.TypeName = "DetailUpdate";
detailParam.Value = detailTbl;
var txnTypeParam = new System.Data.SqlClient.SqlParameter("#TransactionType", SqlDbType.VarChar);
txnTypeParam.Value = txnType;
var result = await db.Database.ExecuteSqlCommandAsync("MySP #UserID, #Details, #TransactionType", userIdParam, detailParam, txnTypeParam);
if(result >= 0)
return StatusCode(HttpStatusCode.OK);
else
return StatusCode(HttpStatusCode.InternalServerError);