DataSet dataSet = new DataSet();
string sql = "SELECT * FROM xxx";
NpgsqlDataAdapter ad = new NpgsqlDataAdapter(sql, SqlConn);
ad.Fill(dataSet);
dataGridView1.DataSource = dataSet.Tables[0];

System.TypeInitializationException: “Npgsql.TypeMapping.GlobalTypeMapper”的類型初始值設定項引發異常。 ---> System.Reflection.ReflectionTypeLoadException: 無法加載一個或多個請求的類型。有關更多信息，請檢索 LoaderExceptions 屬性。
在 System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
在 System.Reflection.Assembly.GetTypes()
在 Npgsql.TypeMapping.GlobalTypeMapper.SetupGlobalTypeMapper()
在 Npgsql.TypeMapping.GlobalTypeMapper..cctor()
--- 內部異常堆棧跟蹤的結尾 ---
在 Npgsql.TypeMapping.ConnectorTypeMapper..ctor(NpgsqlConnector connector)
在 Npgsql.NpgsqlConnector.<LoadDatabaseInfo>d__147.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
在 Npgsql.NpgsqlConnector.<Open>d__146.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
在 Npgsql.ConnectorPool.<AllocateLong>d__28.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
在 Npgsql.NpgsqlConnection.<>c__DisplayClass32_0.<<Open>g__OpenLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
在 Npgsql.NpgsqlConnection.Open()
在 System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
在 System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
在 System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)

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