Passing parameter of type 'object' in table-valued parameter for sql_variant column

Question

I have a table-valued parameter in SQL Server 2012 defined as:

CREATE TYPE [dbo].[TVP] AS TABLE (
    [Id] [int] NOT NULL,
    [FieldName] [nvarchar](100) NO         


        

Answer 1

This post is many years old now but I hit the same problem and have a solution. If you do not use a DataTable but instead populate a collection of SqlDataRecord then you can set the datatype of the SqlDataRecord to SqlDbType.Variant.

 List dataTable = new List();
var dr = new SqlDataRecord(
                            new SqlMetaData("Id", SqlDbType.Int),
                            new SqlMetaData("Value", SqlDbType.Variant));

dr.SetInt32(0, id);
dr.SetValue(1, myObject);

dataTable.Add(dr);

[...]

SqlCommand sqlCommand = new SqlCommand("dbo.MyProc");
var structuredParam = sqlCommand.Parameters.Add("myTableParam", SqlDbType.Structured);
structuredParam.Value = dataTable;