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[Source] String[3]: the Size property has an invalid size of 0.

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Posted on 10/26/2015 9:39:40 AM | | |
When calling a stored procedure in a C# program, a strange exception String[3]: the Size property has an invalid size of 0.

The stored procedure that has this problem is characterized by the presence of out parameters of type varchar or nvarchar

The definition of this parameter at the time of call is similar to
SqlParameter para = new SqlParameter("@paraname", DBType.String);


Workaround: The out parameter must have a specified length, so it should be initialized like this:
SqlParameter para = new SqlParameter("@paraname", DBType.String, size);

  1. DBHelper db = new DBHelper();
  2.             SqlParameter[] param = new SqlParameter[5];
  3.             param[0] = new SqlParameter("ID", SqlDbType.Int);
  4.             param[0].Direction = ParameterDirection.Output;
  5.             param[1] = new SqlParameter("UserID", userid);
  6.             param[2] = new SqlParameter("UserName", SqlDbType.NVarChar, 50);
  7.             param[2].Direction = ParameterDirection.Output;
  8.             param[3] = new SqlParameter("Password", pass);
  9.             param[4] = new SqlParameter("Result", SqlDbType.Int);
  10.             param[4].Direction = ParameterDirection.Output;

  12.             var spc = db.Crm_ExecuteNonQueryReturns("pUserLogin",param);
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