VB.net OOP 如何从 FrmMain 调用命名空间中的方法

Question

我正在尝试创建一个连接到数据库的 VB.net WinForm 应用程序。
我有一个 class 的规范，用于建立数据库连接（系统间缓存）。数据库不重要，原理重要

如何从 FrmMain 中调用此 class 中的方法？我无法理解它。

谢谢

Imports Test.NSConnection.Connection

Public Class FrmMain
    Private Sub FrmMain_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        'how do I call the DoOpenConnectionCache?

    End Sub
End Class

和：

Imports InterSystems.Data.CacheClient
Imports InterSystems.Data.CacheTypes
Imports System
Imports System.Data

Namespace NSConnection
    Public Class Connection
        Private _cacheString As String
        Public Property cacheString() As String
            Get
                Return _cacheString
            End Get
            Set(ByVal value As String)
                _cacheString = value
            End Set
        End Property

        Private _cnCache As CacheADOConnection
        Public Property cnCache() As CacheADOConnection
            Get
                Return _cnCache
            End Get
            Set(ByVal value As CacheADOConnection)
                _cnCache = value
            End Set
        End Property

        Private Sub SetConnectionString()
            
            Dim _cacheString As String = "Server = localhost; Port = ****; Namespace = ****; User ID= **** ; Password= ****;"
            Dim _cnCache = New CacheConnection(_cacheString)
        End Sub

        Public Sub DoOpenConnectionCache()
            Try
                If _cnCache.State = ConnectionState.Closed Then
                    _cnCache.Open()
                End If
            Catch ex As Exception
                MessageBox.Show("Error" & vbCrLf & ex.Message)
            End Try
        End Sub

        Public Sub DoCloseConnectionCache()
            Try
                If _cnCache.State = ConnectionState.Open Then
                    _cnCache.Close()
                End If
            Catch ex As Exception
                MessageBox.Show("Error" & vbCrLf & ex.Message)
            End Try
        End Sub
    End Class
End Namespace

Answer 1

如果你想创建一个Connection类型的对象，那么你可以这样做：

Dim Connection1 As Connection = New Connection()

并调用它的方法DoOpenConnectionCache

VB.net OOP 如何从 FrmMain 调用命名空间中的方法

VB.net OOP How to call method in namespace from FrmMain

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