跟据查询语句集合升成一个DataTable对象

///   <summary>
     ///  跟据查询语句集合升成一个DataTable对象
     ///   </summary>
     ///   <param name="selectSqls"> 查询语句集合 </param>
     ///   <returns> 查询结果 </returns>
     public   static  DataTable GetDataForSqls(System.Collections.Generic.List < string >  selectSqls) {
         using  (SqlConnection conn  =   new  SqlConnection(connectionString))
        {
            conn.Open();
             try
            {
                SqlCommand cmd  =   new  SqlCommand();
                cmd.Connection  =  conn;
                cmd.CommandType  =  CommandType.Text;
                DataTable dt  =   new  DataTable( " wwmTable " );
                 foreach  ( string  selectSql  in  selectSqls)
                {
                    cmd.CommandText  =  selectSql;
                    SqlDataReader sdr  =  cmd.ExecuteReader();
                     while  (sdr.Read())
                    {
                         for  ( int  i  =   0 ; i  <  sdr.FieldCount; i ++ ){
                             string  columnName  =  sdr.GetName(i);
                             if  (dt.Columns.Contains(columnName))  continue ;
                            dt.Columns.Add(columnName, sdr.GetFieldType(i));
                        }
                        DataRow dr  =  dt.NewRow();
                         for  ( int  i  =   0 ; i  <  sdr.FieldCount; i ++ )
                        {
                             string  columnName  =  sdr.GetName(i);
                            dr[columnName]  =  sdr[i];
                        }

                        dt.Rows.Add(dr);
                    }
                    sdr.Dispose();
                }

                 return  dt;
            }
             catch  (Exception ex)
            {
                 throw  ex;
            }
             finally  { 
                 if  (conn.State  ==  ConnectionState.Open) conn.Close();
            }
        }
    }