Pass Array Parameter in SqlCommand

Question

I am trying to pass array parameter to SQL commnd in C# like below, but it does not work. Does anyone meet it before?

string sqlCommand = \"SELECT * from Ta         


        

Answer 1

If you are using MS SQL Server 2008 and above you can use table-valued parameters like described here http://www.sommarskog.se/arrays-in-sql-2008.html.

1. Create a table type for each parameter type you will be using

The following command creates a table type for integers:

create type int32_id_list as table (id int not null primary key)

2. Implement helper methods

public static SqlCommand AddParameter(this SqlCommand command, string name, IEnumerable ids)
{
  var parameter = command.CreateParameter();      

  parameter.ParameterName = name;
  parameter.TypeName = typeof(T).Name.ToLowerInvariant() + "_id_list";
  parameter.SqlDbType = SqlDbType.Structured;
  parameter.Direction = ParameterDirection.Input;

  parameter.Value = CreateIdList(ids);

  command.Parameters.Add(parameter);
  return command;
}

private static DataTable CreateIdList(IEnumerable ids)
{
  var table = new DataTable();
  table.Columns.Add("id", typeof (T));

  foreach (var id in ids)
  {
    table.Rows.Add(id);
  }

  return table;
}

3. Use it like this

cmd.CommandText = "select * from TableA where Age in (select id from @age)"; 
cmd.AddParameter("@age", new [] {1,2,3,4,5});