C#到VB.Net的转换，RaiseEvent的烦恼 [英] C# to VB.Net conversion, RaiseEvent troubles

问题描述

我已将进程创建观察程序从 C# 转换为 VB.Net，但在转换给我带来麻烦的特定代码行时遇到问题.

I've converted a process creation watcher from C# to VB.Net and am having problems converting a certian line of code that's giving me trouble.

这是原始的 C# 代码:

Here's the original C# code:

using System;
using System.ComponentModel;
using System.Collections;
using System.Globalization;
using System.Management;

namespace WMI.Win32
{
    public delegate void ProcessEventHandler(Win32_Process proc);
    public class ProcessWatcher : ManagementEventWatcher
    {
        // Process Events
        public event ProcessEventHandler ProcessCreated;
        public event ProcessEventHandler ProcessDeleted;
        public event ProcessEventHandler ProcessModified;

        // WMI WQL process query strings
        static readonly string WMI_OPER_EVENT_QUERY = @"SELECT * FROM 
        __InstanceOperationEvent WITHIN 1 WHERE TargetInstance ISA'Win32_Process'";
        static readonly string WMI_OPER_EVENT_QUERY_WITH_PROC =
        WMI_OPER_EVENT_QUERY + " and TargetInstance.Name = '{0}'";

    public ProcessWatcher()
    {
        Init(string.Empty);
    }
    public ProcessWatcher(string processName)
    {
        Init(processName);
    }
    private void Init(string processName)
    {
        this.Query.QueryLanguage = "WQL";
        if (string.IsNullOrEmpty(processName))
        {
            this.Query.QueryString = WMI_OPER_EVENT_QUERY;
        }
        else
        {
            this.Query.QueryString =
                string.Format(WMI_OPER_EVENT_QUERY_WITH_PROC, processName);
        }

        this.EventArrived += new EventArrivedEventHandler(watcher_EventArrived);
    }
    private void watcher_EventArrived(object sender, EventArrivedEventArgs e)
    {
        string eventType = e.NewEvent.ClassPath.ClassName;
        Win32_Process proc = new 
            Win32_Process(e.NewEvent["TargetInstance"] as ManagementBaseObject);

        switch (eventType)
        {
            case "__InstanceCreationEvent":
                if (ProcessCreated != null) ProcessCreated(proc); break;
            case "__InstanceDeletionEvent":
                if (ProcessDeleted != null) ProcessDeleted(proc); break;
            case "__InstanceModificationEvent":
                if (ProcessModified != null) ProcessModified(proc); break;
        }
    }
}

// Auto-Generated running: mgmtclassgen Win32_Process /n root\cimv2 /o WMI.Win32
// Renaming the class from Process to Win32_Process
public class Win32_Process { ... }
}

这是 VB.Net 转换:

And here's the VB.Net conversion:

Imports System.ComponentModel
Imports System.Collections
Imports System.Globalization
Imports System.Management

Namespace WMI.Win32
Public Delegate Sub ProcessEventHandler(proc As Win32_Process)
Public Class ProcessWatcher
    Inherits ManagementEventWatcher
    ' Process Events
    Public Event ProcessCreated As ProcessEventHandler
    Public Event ProcessDeleted As ProcessEventHandler
    Public Event ProcessModified As ProcessEventHandler

    ' WMI WQL process query strings
    Shared ReadOnly WMI_OPER_EVENT_QUERY As String = "SELECT * FROM " & vbCr & vbLf & "__InstanceOperationEvent WITHIN 1 WHERE TargetInstance ISA 'Win32_Process'"
    Shared ReadOnly WMI_OPER_EVENT_QUERY_WITH_PROC As String = WMI_OPER_EVENT_QUERY + " and TargetInstance.Name = '{0}'"

    Public Sub New()
        Init(String.Empty)
    End Sub
    Public Sub New(processName As String)
        Init(processName)
    End Sub
    Private Sub Init(processName As String)
        Me.Query.QueryLanguage = "WQL"
        If String.IsNullOrEmpty(processName) Then
            Me.Query.QueryString = WMI_OPER_EVENT_QUERY
        Else
            Me.Query.QueryString = String.Format(WMI_OPER_EVENT_QUERY_WITH_PROC, processName)
        End If

        Me.EventArrived += New EventArrivedEventHandler(AddressOf watcher_EventArrived)
    End Sub
    Private Sub watcher_EventArrived(sender As Object, e As EventArrivedEventArgs)
        Dim eventType As String = e.NewEvent.ClassPath.ClassName
        Dim proc As New Win32_Process(TryCast(e.NewEvent("TargetInstance"), ManagementBaseObject))

        Select Case eventType
            Case "__InstanceCreationEvent"
                RaiseEvent ProcessCreated(proc)
                Exit Select
            Case "__InstanceDeletionEvent"
                RaiseEvent ProcessDeleted(proc)
                Exit Select
            Case "__InstanceModificationEvent"
                RaiseEvent ProcessModified(proc)
                Exit Select
        End Select
    End Sub
End Class


End Namespace

这行代码有问题:

Me.EventArrived += New EventArrivedEventHandler(AddressOf watcher_EventArrived)

我似乎无法弄清楚如何正确转换它，感谢您的帮助！

I can't seem to figure out how to convert it correctly, I appreciate any help!

推荐答案

这一行:

Me.EventArrived += New EventArrivedEventHandler(AddressOf watcher_EventArrived)

应该是:

AddHandler Me.EventArrived , AddressOf Me.watcher_EventArrived

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