Question

如何使用 System.Data.Sql.SqlDataSourceEnumerator 类来了解可用的sql数据源......？因为我正在创建与sql server的连接，如果sql server还没有准备好，我们将得到异常...所以首先我想知道sql server是否已准备好接受请求...如何知道......

Answer 1

所以，根据以下参考文献：

http://social.msdn.microsoft.com/forums/en-US/sqlsmoanddmo/thread/49ba019f-e8b5-457c-80ea-fac5febb9d3d/

http://connect.microsoft.com/SQLServer/feedback/details/146323/enumavailablesqlservers-or-sqldatasourceenumerator-incorrect-list-of-available-databases

http://blogs.msdn.com/b/sushilc/archive/2004/10/14/242395.aspx

http://sqlblogcasts.com/blogs/jonsayce/archive/2008/02/10/programatically-listing-sql-servers.aspx

GetDataSources（）不是一个完美的方法，这意味着，它可能不会在第一次尝试时列出所有可用的数据源。事实上，我发现它也没有列出你所有的本地资源。

就我的目的而言，我在程序启动和我需要获取可用来源列表之间有一段时间，无论是在网络还是本地。所以，我把代码放在一个永远收集所有源代码的线程中。它在下面。 如果取出while循环，可以根据需要多次手动调用。

        private List<string> sqlInstances = new List<string>();
        private void collectInstances()
        {
            while (true)
            {
                System.Data.Sql.SqlDataSourceEnumerator instance = System.Data.Sql.SqlDataSourceEnumerator.Instance;
                System.Data.DataTable dataTable = instance.GetDataSources();
                foreach (DataRow row in dataTable.Rows)
                {
                    string instanceName = String.Format(@"{0}\{1}", row["ServerName"].ToString(), row["InstanceName"].ToString());

                    //Do not add the local instance, we will add it in the next section. Otherwise, duplicated!
                    if (!sqlInstances.Contains(instanceName) && !instanceName.Contains(Environment.MachineName))
                    {
                        sqlInstances.Add(instanceName);
                    }
                }

                /*
                 * For some reason, GetDataSources() does not get local instances. So using code from here to get them
                 * http://stackoverflow.com/questions/6824188/sqldatasourceenumerator-instance-getdatasources-does-not-locate-local-sql-serv
                 */
                List<string> lclInstances = GetLocalSqlServerInstanceNames();
                foreach (var lclInstance in lclInstances)
                {
                    string instanceName = String.Format(@"{0}\{1}", Environment.MachineName, lclInstance);
                    if (!sqlInstances.Contains(instanceName)) sqlInstances.Add(instanceName);
                }
                sqlInstances.Sort();
            }
        }

        //Got code from: http://stackoverflow.com/questions/6824188/sqldatasourceenumerator-instance-getdatasources-does-not-locate-local-sql-serv
        /// <summary>
        ///  get local sql server instance names from registry, search both WOW64 and WOW3264 hives
        /// </summary>
        /// <returns>a list of local sql server instance names</returns>
        public static List<string> GetLocalSqlServerInstanceNames()
        {
            RegistryValueDataReader registryValueDataReader = new RegistryValueDataReader();

            string[] instances64Bit = registryValueDataReader.ReadRegistryValueData(RegistryHive.Wow64,
                                                                                    Registry.LocalMachine,
                                                                                    @"SOFTWARE\Microsoft\Microsoft SQL Server",
                                                                                    "InstalledInstances");

            string[] instances32Bit = registryValueDataReader.ReadRegistryValueData(RegistryHive.Wow6432,
                                                                                    Registry.LocalMachine,
                                                                                    @"SOFTWARE\Microsoft\Microsoft SQL Server",
                                                                                    "InstalledInstances");

            //FormatLocalSqlInstanceNames(ref instances64Bit);
            //FormatLocalSqlInstanceNames(ref instances32Bit);

            List<string> localInstanceNames = new List<string>(instances64Bit);
            foreach (var item in instances32Bit)
            {
                if (!localInstanceNames.Contains(item)) localInstanceNames.Add(item);
            }

            //localInstanceNames = localInstanceNames.Union(instances32Bit).ToList();

            return localInstanceNames;
        }

Answer 2

GetDataSources（）可以帮到你，你试过吗？

SqlDataSourceEnumerator.GetDataSources Method

Answer 3

当前SqlDataSourceEnumerator在.NetCore或.Net5中均不可用，并且虽然不能直接替代SqlDataSourceEnumerator，但可以尝试使用Udp解决方案。

此存储库以.Net5为目标，但是该代码在.NetCore风格上应该可以正常工作。

https://github.com/mrsquish/SqlBrowserClient

我如何使用System.Data.Sql.SqlDataSourceEnumerator类来了解可用的sql数据源......？

3 个答案: