C#数据同步中基本步骤和用到的相关函数

数据同步对比步骤:

1.将两数据库中对应的数据表分别生成XML文件

         /// <summary>
        /// 将一个DataTable以xml方式存入指定的文件中
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="filePath"></param>
        public void SaveDataTableToXml(DataTable dt, string filePath)
        {
            //创建文件夹
            if (!Directory.Exists(Path.GetDirectoryName(filePath)))
            {
                Directory.CreateDirectory(Path.GetDirectoryName(filePath));
            }

            DataSet ds = new DataSet();
            ds.Tables.Add(dt.Copy());
            ds.WriteXml(filePath);
        }

        /// <summary>
        /// 从一个指定的文件中读取DataTable
        /// </summary>
        /// <param name="filePath"></param>
        public DataTable ReadDataTableFromXml(string filePath)
        {
            DataSet ds = new DataSet();
            ds.ReadXml(filePath);
            if (ds.Tables.Count > 0)
            {
                return ds.Tables[0];
            }
            else
            {
                return null;
            }
        }

2.上传要对比的XML数据文件到服务器端或者是从服务器下载XML文件到本地

        C#Sockect异步传送或者WebClient方式传送

3.对比要同步的数据资料

         /// <summary>
        /// 对比文件
        /// </summary>
        /// <param name="localFile">本地文件</param>
        /// <param name="remoteFile">远程文件</param>
        /// <returns></returns>
        private bool FileCompare(string localFile, string remoteFile)
        {
            int localFilebyte;
            int remoteFilebyte;
            FileStream localFileStream;
            FileStream remoteFileStream;
            if (localFile == remoteFile)
            {
                return true;
            }
            localFileStream = new FileStream(localFile, FileMode.Open);
            remoteFileStream = new FileStream(remoteFile, FileMode.Open);
            if (localFileStream.Length != remoteFileStream.Length)
            {
                localFileStream.Close();
                remoteFileStream.Close();
                return false;
            }
            do
            {
                localFilebyte = localFileStream.ReadByte();
                remoteFilebyte = remoteFileStream.ReadByte();
            }
            while ((localFilebyte == remoteFilebyte) && (localFilebyte != -1));
            localFileStream.Close();
            remoteFileStream.Close();
            return ((localFilebyte - remoteFilebyte) == 0);
        }
        /// <summary>
        /// 对比数据表
        /// </summary>
        /// <param name="localDataTable">本地数据表</param>
        /// <param name="remoteDataTable">远程数据表</param>
        /// <returns></returns>
        public bool DataTableCompare(DataTable localDataTable, DataTable remoteDataTable)
        {
            if (localDataTable == null || remoteDataTable == null)
            {
                return false;
            }
            if (localDataTable.Rows.Count != remoteDataTable.Rows.Count)
            {
                return false;
            }
            if (localDataTable.Columns.Count != remoteDataTable.Columns.Count)
            {
                return false;
            }
            for (int i = 0; i < localDataTable.Rows.Count; i++)
            {
                for (int j = 0; j < localDataTable.Columns.Count; j++)
                {
                    if (localDataTable.Rows[i][j].ToString() != remoteDataTable.Rows[i][j].ToString())
                    {
                        return false;
                    }
                }
            }
            return true;
        }