我有一个自定义的Exception类，我正试图从我的平台特定的.NET MAUI实现中抛出它。我想在MainPage.xaml.cs中捕获这个异常，在这里对象被初始化。

// Exception class
public class MyCustomException : Exception
{
    public MyCustomException(string message) : base(message) { }
}

// MyClass partial class in MainCode/Common code
public partial class MyClass
{
    public MyClass()
    {
        try
        {
            MyPrivateMethod();
        }
        catch (Exception ex)
        {
            throw new MyCustomException("Error initializing MyClass");
   
        }
    }

    partial void MyPrivateMethod();

    partial void MyCalledMethod();
}

// Platform-specific implementation of MyClass partial class for .NET MAUI
public partial class MyClass
{
    partial void MyPrivateMethod()
    {
        MyCalledMethod(); // Call the platform-specific implementation of MyCalledMethod
    }

    partial void MyCalledMethod()
    {
        // Implement the platform-specific code for MyCalledMethod
        // This method can throw an exception
        throw new Exception("Something went wrong in MyCalledMethod");
    }
}

// Usage in MainPage.xaml.cs
public partial class MainPage : ContentPage
{
    private MyClass _myClass;

    public MainPage()
    {
        InitializeComponent();

        try
        {
            _myClass = new MyClass();
        }
        catch (MyCustomException ex)
        {
            // Handle the exception here
            Console.WriteLine($"Error: {ex.Message}");
        }
    }
}

我在特定于平台的代码中的MyCalledMethod处获得异常未处理的错误。我想在MainPage.xaml.cs中处理MyCustomException并相应地工作。