Question

TDBACore.vb的代码：

Imports System.ComponentModel
Imports System.Data

<EditorBrowsable(EditorBrowsableState.Never)> _
Public MustInherit Class TDBACore        
    Private Shared FRefCount As Integer

    Friend Shared FIsBeginTran As Boolean = False

    Friend Shared FConnection As IDbConnection

    Friend Shared FTransaction As IDbTransaction

    Private disposedValue As Boolean

    Friend Shared iRecheckTimeout As Integer
    Friend Shared iConnectionTimeOut As Integer

    Friend MustOverride Function CreateConnection() As IDbConnection

    Public Sub New()
        Me.disposedValue = False
        If TDBACore.FRefCount = 0 Then
            TDBACore.FConnection = Me.CreateConnection()
        End If
        TDBACore.FRefCount += 1

    End Sub

   Friend Shared Sub OpenConnection(ByVal ConnectionString As String)
    If TDBACore.FConnection.State = ConnectionState.Closed Then
        TDBACore.FConnection.ConnectionString = ConnectionString
        TDBACore.FConnection.Open()
    End If
   End Sub
End Class

TDBOpener.vb的代码：

Public NotInheritable Class TDBOpener
    Inherits TDBACore
    Public Shared ReadOnly _TDBOpener As New TDBOpener()
    Friend Overrides Function CreateConnection() As IDbConnection
        Return New NpgsqlConnection()
    End Function

    Public Shared Sub SetTimeoutValue(ByVal param_iRecheckTimeout As Integer, ByVal param_iConnectionTimeOut As Integer)
        TDBACore.iConnectionTimeOut = param_iConnectionTimeOut
        TDBACore.iRecheckTimeout = param_iRecheckTimeout
    End Sub

    Public Shared Sub Open(ByVal ConnectionString As String)
        TDBACore.OpenConnection(ConnectionString)
    End Sub
 End Class

我通过Npgsql.dll 3.2.2.0测试连接到postgresql：

TDBOpener.Open("Server=192.168.1.10;Port=5434;UserId=postgres;Password=123456;Database=testdb;CommandTimeout=300;")

我使用Win 10,64bit，与2017 .Net Framework 4.6

如果我按模式[Debug]运行：它可以运行New()的函数TDBACore并连接ok。但如果我按模式[发布]运行，则不会转到New()的{{1}}功能。为什么？谢谢大家。（注意：我尝试赢7，没关系。）

Answer 1

赢得10,64位，与2017年.Net Framework 4.6：如果我按模式[发布]运行，则无法初始化Public Shared ReadOnly _TDBOpener As New TDBOpener()

Open的解决方案编辑功能TDBOpener：

Public Shared Sub Open(ByVal ConnectionString As String)
        If TDBACore.FConnection Is Nothing Then
            Dim obOpen = _TDBOpener
        End If
        TDBACore.OpenConnection(ConnectionString)
End Sub

Answer 2

您遇到问题的原因以及修复工作原因是因为编译器正在优化_TDBOpener，因为它没有被引用。 This question有更多详情。

为什么在构建版本时无法在Win 10 64bit中连接到Postgresql？

2 个答案: