c# - 匿名方法 - C# 到 VB.NET

Question

我需要在终端服务器上实现应用程序的单个 VB.NET 实例。为此，我使用了Flawless Code博客中的代码。它运行良好，除了代码是用 C# 编写的并且使用了 VB.NET 不支持的匿名方法。我需要重写以下内容，以便可以将其用作 VB.NET 中的事件。

static Form1 form;

static void singleInstance_ArgumentsReceived(object sender, ArgumentsReceivedEventArgs e)
    {
        if (form == null)
            return;

        Action<String[]> updateForm = arguments =>
            {
                form.WindowState = FormWindowState.Normal;
                form.OpenFiles(arguments);
            };
        form.Invoke(updateForm, (Object)e.Args); //Execute our delegate on the forms thread!
    }
}

Answer 1

您可以使用以下代码：

Private Shared form As Form1

Private Shared Sub singleInstance_ArgumentsReceived(ByVal sender As Object, ByVal e As ArgumentsReceivedEventArgs)
    If form Is Nothing Then Return
    form.Invoke(New Action(Of String())(AddressOf updateFormMethod), e.Args)
End Sub

Private Shared Sub updateFormMethod(ByVal arguments As String())
    form.WindowState = FormWindowState.Normal
    form.OpenFiles(arguments)
End Sub

Answer 2

在 VS 2010 的 VB.NET 中，您可以执行以下操作：

Shared form As Form1
Shared Sub singleInstance_ArgumentsReceived(ByVal sender As Object, ByVal e As ArgumentsReceivedEventArgs)
    If form Is Nothing Then Return

    Dim updateForm As Action(Of String()) = Sub(arguments)
                                                form.WindowState = FormWindowState.Normal
                                                form.OpenFiles(arguments)
                                            End Sub

    form.Invoke(updateForm, e.args)

End Sub

Answer 3

这：

public void Somemethod()
{
    Action<String[]> updateForm = arguments =>
        {
            form.WindowState = FormWindowState.Normal;
            form.OpenFiles(arguments);
        };
}

将与以下内容相同：

public void Somemethod()
{
    Action<String[]> updateForm = OnAction;
}

//named method
private void OnAction(string[] arguments)
{
    form.WindowState = FormWindowState.Normal;
    form.OpenFiles(arguments);
}

然后您可以轻松地进行 VB.net 转换，如下所示：

Public Sub SomeMethod()

    Dim updateForm As Action(Of String()) = New Action(Of String())(AddressOf Me.OnAction)
    Me.form.Invoke(updateForm, New Object() { e })

End Sub

Private Sub OnAction(ByVal arguments As String())
    form.WindowState = FormWindowState.Normal
    form.OpenFiles(arguments)
End Sub