Sql server nfig数据库是一个选项。如果位置联网，则中央配置数据库是一个选项。 var connectionString = Environment.GetEnvironmentVariable("MY_APP_CONNECTION_STRING"); var db

---

nfig数据库是一个选项。如果位置联网，则中央配置数据库是一个选项。

var connectionString = Environment.GetEnvironmentVariable("MY_APP_CONNECTION_STRING");
var dbContext = new DbContext(connectionString);

    private SqlConnectionStringBuilder _connString = new SqlConnectionStringBuilder();


    private void RefreshConnectionString()
    {
        _connString.ApplicationName = AppDomain.CurrentDomain.ApplicationIdentity.FullName;
        _connString.ApplicationIntent = ApplicationIntent.ReadWrite;
        _connString.DataSource = GetSqlDatasources().FirstOrDefault();
        _connString.InitialCatalog = GetSqlDatabases().FirstOrDefault();
        _connString.AsynchronousProcessing = true;
        _connString.ConnectTimeout = 5;
        _connString.IntegratedSecurity = true;
        _connString.Pooling = true;
    }

    private IEnumerable<string> GetSqlDatabases()
    {
        using (var conn = new SqlConnection(_connString.ConnectionString))
        {
            using (var cmd = new SqlCommand(@"SELECT [name] FROM sys.databases WHERE [name] NOT IN ('master', 'model', 'msdb', 'tempdb')", conn))
            {
                var dbnames = new List<string>();
                try
                {
                    conn.Open();
                    var reader = cmd.ExecuteReader();
                    while (reader.Read()) dbnames.Add(reader.GetString(0));
                }
                catch {}
                return dbnames;
            }
        }
    }

    private IEnumerable<string> GetSqlDatasources()
    {
        var sqlEnum = SqlDataSourceEnumerator.Instance;
        return sqlEnum.GetDataSources().Rows.OfType<DataRow>().Select(row => row[0].ToString());
    }