如何在构造函数中使用Visual Studio不会在设计时执行代码？

public class MyClass
{
    public MyClass()
    {
        if (!DesignMode)
        {
            // 在这里编写不需要在设计时执行的代码
        }
    }

    private bool DesignMode
    {
        get
        {
            return DesignModeHelper.IsInDesignMode(this);
        }
    }
}

public static class DesignModeHelper
{
    private static readonly DependencyProperty DesignerProperty =
        DependencyProperty.RegisterAttached("Designer", typeof(bool), typeof(DesignModeHelper),
            new FrameworkPropertyMetadata(false));

    public static bool IsInDesignMode(DependencyObject obj)
    {
        return (bool)obj.GetValue(DesignerProperty);
    }

    public static void SetIsInDesignMode(DependencyObject obj, bool value)
    {
        obj.SetValue(DesignerProperty, value);
    }
}