比较两个DataTable内容是否相等，先是比数量，数量相等就比内容

    #region 比较两个DataTable内容是否相等，先是比数量，数量相等就比内容
        ///   <summary> 
        ///   比较两个DataTable内容是否相等，先是比数量，数量相等就比内容 
        ///   </summary> 
        ///   <param   name= "dtA "> </param> 
        ///   <param   name= "dtB "> </param> 
        public static bool CompareDataTable(DataTable dtA, DataTable dtB)
        {
            if (dtA.Rows.Count == dtB.Rows.Count)
            {
                if (CompareColumn(dtA.Columns, dtB.Columns))
                {
                    //比内容 
                    for (int i = 0; i < dtA.Rows.Count; i++)
                    {
                        for (int j = 0; j < dtA.Columns.Count; j++)
                        {
                            if (!dtA.Rows[i][j].Equals(dtB.Rows[i][j]))
                            {
                                return false;
                            }
                        }
                    }
                    return true;
                }
                else
                {
                    return false;
                }
            }
            else
            {
                return false;
            }
        }
        ///   <summary> 
        ///   比较两个字段集合是否名称,数据类型一致 
        ///   </summary> 
        ///   <param   name= "dcA "> </param> 
        ///   <param   name= "dcB "> </param> 
        ///   <returns> </returns> 
        private static bool CompareColumn(System.Data.DataColumnCollection dcA, System.Data.DataColumnCollection dcB)
        {
            if (dcA.Count == dcB.Count)
            {
                foreach (DataColumn dc in dcA)
                {
                    //找相同字段名称 
                    if (dcB.IndexOf(dc.ColumnName) > -1)
                    {
                        //测试数据类型 
                        if (dc.DataType != dcB[dcB.IndexOf(dc.ColumnName)].DataType)
                        {
                            return false;
                        }
                    }
                    else
                    {
                        return false;
                    }
                }
                return true;
            }
            else
            {
                return false;
            }
        }
        #endregion