C# 到 VB.Net 问题

Question

好吧，我对这两种语言都不是很流利，所以如果这是一个简单的问题，请原谅我。我正在尝试将一些示例代码从 C# 转置到 VB.net，因为我更熟悉 VB.Net，并且希望将其实现到现有项目中。我有一个简单的类和一个简单的表格。我在 events.required 的继承行中遇到错误，并且不知道如何解决。

C# 效果很好我的类 C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using com.handpoint.api;
namespace WindowsGettingStartedApp
{
    class MyClass : Events.Required
    {
        Hapi api;
        Device device;
        private Form1 UIClass;
        public MyClass(Form1 form1)
        {
            InitApi();
            UIClass = form1;
        }
        public void InitApi()
        {
            string sharedSecret = "0102030405060708091011121314151617181920212223242526272829303132";
            api = HapiFactory.GetAsyncInterface(this).DefaultSharedSecret(sharedSecret);
            // The api is now initialized, and we've  set a default shared secret
            // The shared secret is a unique string shared between the card reader and your mobile application.
            // It prevents other people from connecting to your card reader.
            // You should replace this default shared secret by the one sent by our support team.
        }
        public void DiscoverDevices()
        {
            api.ListDevices(ConnectionMethod.BLUETOOTH);
            // This triggers the search for all the bluetooth devices around.
            // You can also search for USB and Serial as a connection method
        }
        public void DeviceDiscoveryFinished(List<Device> devices)
        {
            foreach (Device device in devices)
            {
                if (device.Name != null)
                {
                    if (device.Name.Equals("PP0513901435"))
                    // Put the name of your device, find it by pressing C then up arrow on your card reader keypad
                    {
                        this.device = device;
                        // We'll remember the device for this session, and you should too
                        api.UseDevice(this.device);
                        // Connection to the device is handled automatically in the API
                    }
                }
            }
        }
        // You can also connect directly to a specific device without having to discover the other devices around :
        public void DirectConnect()
        {
            Device device = new Device("PP0513901435", "68:AA:D2:00:D5:27", "", ConnectionMethod.BLUETOOTH);
            // The MAC Adress always has to be written in UPPER CASE
            // new Device("name", "address", "port", ConnectionMethod);
            api.UseDevice(device);
        }
        public bool Pay()
        {
            return api.Sale(new BigInteger("1000"), Currency.GBP);
            // Let´s start our first payment of 10 pounds
        }
        public void SignatureRequired(SignatureRequest signatureRequest, Device device)
        {
            // You'll be notified here if a sale process needs a signature verification
            // A signature verification is needed if the cardholder uses an MSR or a chip & signature card
            // This method will not be invoked if a transaction is made with a Chip & PIN card
            api.SignatureResult(true); // This line means that the cardholder ALWAYS accepts to sign the receipt.
            // A specific line will be displayed on the merchant receipt for the cardholder to be able to sign it
        }
        public void EndOfTransaction(TransactionResult transactionResult, Device device)
        {
            UIClass.DisplayReceipts(transactionResult.MerchantReceipt, transactionResult.CustomerReceipt);
        }
        public void Disconnect()
        {
            api.Disconnect();
        }
    }
}

C# 非常适合 Form1

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsGettingStartedApp
{
    public partial class Form1 : Form
    {
        MyClass my;
        public Form1()
        {
            InitializeComponent();
            my = new MyClass(this);
        }
        private void PayButton_Click(object sender, EventArgs e)
        {
            my.Pay();
        }
        private void ConnectButton_Click(object sender, EventArgs e)
        {
            my.DiscoverDevices();
            // my.DirectConnect();
        }
        private void DisconnectButton_Click(object sender, EventArgs e)
        {
            my.Disconnect();
        }
        public delegate void UpdateReceiptsCallback(string MerchantReceipt, string CustomerReceipt);
        public void DisplayReceipts(string MerchantReceipt, string CustomerReceipt)
        {
            // Only need to check for one of the webBrowsers
            if (MerchantReceiptBrowser.InvokeRequired)
            {
                UpdateReceiptsCallback d = new UpdateReceiptsCallback(DisplayReceipts);
                this.Invoke(d, new object[] { MerchantReceipt, CustomerReceipt });
            }
            else
            {
                MerchantReceiptBrowser.DocumentText = MerchantReceipt;
                CardholderReceiptBrowser.DocumentText = CustomerReceipt;
            }
        }
    }
}

我的 VB.Net MyClass 转换

Imports System.Collections.Generic
Imports System.Linq
Imports System.Text
Imports com.handpoint.api
Namespace WindowsGettingStartedApp

Class [MyClass]
    Inherits Events.Required

上面的行出现错误:类只能从其他类继承

    Private api As Hapi
    Private device As Device
    Private UIClass As Form1
    Public Sub New(form1 As Form1)
        InitApi()
        UIClass = form1
    End Sub
    Public Sub InitApi()
        Dim sharedSecret As String = "0102030405060708091011121314151617181920212223242526272829303132"
        api = HapiFactory.GetAsyncInterface(Me).DefaultSharedSecret(sharedSecret)
        ' The api is now initialized, and we've  set a default shared secret
        ' The shared secret is a unique string shared between the card reader and your mobile application.
        ' It prevents other people from connecting to your card reader.
        ' You should replace this default shared secret by the one sent by our support team.
    End Sub
    Public Sub DiscoverDevices()
        api.ListDevices(ConnectionMethod.BLUETOOTH)
        ' This triggers the search for all the bluetooth devices around.
        ' You can also search for USB and Serial as a connection method
    End Sub
    Public Sub DeviceDiscoveryFinished(devices As List(Of Device))
        For Each device As Device In devices
            If device.Name IsNot Nothing Then
            If device.Name.Equals("PP0513901435") Then
                    ' Put the name of your device, find it by pressing C then up arrow on your card reader keypad
                    Me.device = device
                    ' We'll remember the device for this session, and you should too
                        ' Connection to the device is handled automatically in the API
                    api.UseDevice(Me.device)
                End If
            End If
        Next
    End Sub
    ' You can also connect directly to a specific device without having to discover the other devices around :
    Public Sub DirectConnect()
        Dim device As New Device("PP0513901435", "68:AA:D2:00:D5:27", "", ConnectionMethod.BLUETOOTH)
        ' The MAC Adress always has to be written in UPPER CASE
        ' new Device("name", "address", "port", ConnectionMethod);
        api.UseDevice(device)
    End Sub
    Public Function Pay() As Boolean
        Return api.Sale(New BigInteger("1000"), Currency.GBP)
        ' Let´s start our first payment of 10 pounds
    End Function
    Public Sub SignatureRequired(signatureRequest As SignatureRequest, device As Device)
        ' You'll be notified here if a sale process needs a signature verification
        ' A signature verification is needed if the cardholder uses an MSR or a chip & signature card
        ' This method will not be invoked if a transaction is made with a Chip & PIN card
        api.SignatureResult(True)
        ' This line means that the cardholder ALWAYS accepts to sign the receipt.
        ' A specific line will be displayed on the merchant receipt for the cardholder to be able to sign it
    End Sub

    Public Sub EndOfTransaction(transactionResult As TransactionResult, device As Device)
        UIClass.DisplayReceipts(transactionResult.MerchantReceipt, transactionResult.CustomerReceipt)
    End Sub
    Public Sub Disconnect()
        api.Disconnect()
    End Sub
End Class
End Namespace

我的 VB.Net Form1

Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Linq
Imports System.Text
Imports System.Windows.Forms
Namespace WindowsGettingStartedApp
Public Partial Class Form1
    Inherits Form
    Private my As [MyClass]
    Public Sub New()
        InitializeComponent()

上面的行给我错误“InitializeComponent”未声明。由于其保护级别，它可能无法访问。在引用表单上的对象时，我也遇到了上述错误。

        my = New [MyClass](Me)
    End Sub
    Private Sub PayButton_Click(sender As Object, e As EventArgs)
        my.Pay()
    End Sub
    Private Sub ConnectButton_Click(sender As Object, e As EventArgs)
        my.DiscoverDevices()
        ' my.DirectConnect();
    End Sub

    Private Sub DisconnectButton_Click(sender As Object, e As EventArgs)
        my.Disconnect()
    End Sub
    Public Delegate Sub UpdateReceiptsCallback(MerchantReceipt As String, CustomerReceipt As String)
    Public Sub DisplayReceipts(MerchantReceipt As String, CustomerReceipt As String)
        ' Only need to check for one of the webBrowsers
        If MerchantReceiptBrowser.InvokeRequired Then
            Dim d As New UpdateReceiptsCallback(AddressOf DisplayReceipts)
            Me.Invoke(d, New Object() {MerchantReceipt, CustomerReceipt})
        Else
            MerchantReceiptBrowser.DocumentText = MerchantReceipt
            CardholderReceiptBrowser.DocumentText = CustomerReceipt
        End If
    End Sub
End Class
End Namespace

我的Form1.Designer.vb

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Form1
Inherits System.Windows.Forms.Form

'Form overrides dispose to clean up the component list.
<System.Diagnostics.DebuggerNonUserCode()> _
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
    Try
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
    Finally
        MyBase.Dispose(disposing)
    End Try
End Sub

'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer

'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.  
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
    components = New System.ComponentModel.Container
    Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
    Me.Text = "Form1"
End Sub
End Class

任何见解都会很棒。我确信我错过了一些简单的东西，但我又是一个新手。我将出现错误的地方加粗了。感谢您的帮助。

Answer 1

第一个错误是因为 Events.Required 是一个接口(interface)，所以它应该读取

 Implements Events.Required 

而不是

 Inherits Events.Required

第二个错误是因为 InitializeComponent 是在表单设计器文件中声明的，您可能没有在应用程序中包含/翻译该文件。如果您想检查它应该是什么样子，请向您的项目添加一个新表单。