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Question

 DataSet _myDataSet = new DataSet();//存有11张DataTable
 public DataTable JudgeDataIsByte(int SeleteItem)
        {
            DataTable table = _myDataSet.Tables[SeleteItem];
            DataTable newTable = null;
            try
            {
                newTable = table.Clone();//克隆表结构
                newTable.Columns["GUID"].DataType = typeof(string);//改变 GUID数据类型
                foreach (DataRow tabRow in table.Rows)
                {
                    foreach (DataColumn tabCol in table.Columns)
                    {
                        string str = "";
                        if (tabCol.DataType == typeof(byte[]))
                        { 
                            byte[] guid = (byte[])tabRow[tabCol];
                            //循环将十六进制转为string
                            for (int i = 0; i < guid.Length; i++) 
                            {
                                str += guid[i].ToString("X2");
                            }
                        }
                    }
                    newTable.ImportRow(tabRow);//将Table中的数据复制到newTable中
                    //这里该怎么写，请教。
                    //问题：newTable 有了数据后,要将循环得到的 str 赋值给每一行的 GUID， 
                    //最后返回newTable
                    //注：每一行的 str 是不相同的 
                }
            }
            catch { }
            return newTable;
           
        }

Answer 1

DataRow row = newTable.NewRow();
row["GUID"] = str;
newTable.row.Add(row);

Answer 2

  DataSet _myDataSet = new DataSet();//存有11张DataTable
        public DataTable JudgeDataIsByte(int SeleteItem)
        {
            DataTable table = _myDataSet.Tables[SeleteItem];
            DataTable newTable = null;
            try
            {
                newTable = table.Clone();//克隆表结构
                newTable.Columns["GUID"].DataType = typeof(string);//改变 GUID数据类型
                foreach (DataRow tabRow in table.Rows)
                {
                    string str = "";
                    foreach (DataColumn tabCol in table.Columns)
                    { 
                        if (tabCol.DataType == typeof(byte[]))
                        {
                            byte[] guid = (byte[])tabRow[tabCol];
                            //循环将十六进制转为string
                            for (int i = 0; i < guid.Length; i++)
                            {
                                str += guid[i].ToString("X2");
                            }
                        }
                    }
                    newTable.ImportRow(tabRow);//将Table中的数据复制到newTable中
                    newTable.Rows[0]["GUID"] = str;  
                    //这里该怎么写，请教。
                    //问题：newTable 有了数据后,要将循环得到的 str 赋值给每一行的 GUID，  
                    //最后返回newTable
                    //注：每一行的 str 是不相同的  
                }
            }
            catch { }
            return newTable;        }