- 优化 IAdo.ConnectionString 使用 UseConnectionFactory 时值为 NULL 的问题；

Providers/FreeSql.Provider.Custom/MySql/CustomMySqlAdo/CustomMySqlAdo.cs

@@ -20,6 +20,7 @@ namespace FreeSql.Custom.MySql
             if (connectionFactory != null)
             {
                 var pool = new FreeSql.Internal.CommonProvider.DbConnectionPool(DataType.SqlServer, connectionFactory);
+                ConnectionString = pool.TestConnection?.ConnectionString;
                 MasterPool = pool;
                 return;
             }