public string DbTest([FromBody] DbTest req)
{
var param = new DynamicParameters();
//param.Add("ThirdPartyCode", null, DbType.String);
param.AddDynamicParams(new { ThirdPartyCode = default(string) });
var result = _testDb.C_Test("[Back].[s_ThirdParty_Get]", param, CommandType.StoredProcedure);
return(JsonConvert.SerializeObject(result));
}