Bootstrapper DisplayRootFor<MV>() 异常：没有无参数构造函数

Question

我需要创建一个简单的应用程序，其中 MainViewModel 在初始化期间会发生一些事情。

当我尝试运行我的代码时，异常发生在 AppBootstrapper 中的 DisplayRootViewFor<MainViewModel>(); 行：

An exception of type 'System.MissingMethodException' occurred in mscorlib.dll but was not handled in user code

Additional information: No parameterless constructor defined for this object.

引导程序：

using System;
using Ninject;
using Caliburn.Micro;

namespace ChartsDisplayer2016
{ 
    public class AppBootstrapper : BootstrapperBase
    {
        private IKernel kernel;
        public AppBootstrapper()
        {
            Initialize();
        }

        protected override void Configure()
        {
            kernel = new StandardKernel();
            kernel.Load(AppDomain.CurrentDomain.GetAssemblies());
            kernel.Bind<IEventAggregator>().To<EventAggregator>().InSingletonScope();
        }
        protected override void BuildUp(object instance)
        {
            kernel.Inject(instance);
        }
        protected override void OnStartup(object sender, System.Windows.StartupEventArgs e)
        {
            base.OnStartup(sender, e);
            DisplayRootViewFor<MainViewModel>();
        }
    }
}

MainViewModel:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ChartsDisplayer2016.Core.Charts.ViewModels;
using Caliburn.Micro;

namespace ChartsDisplayer2016.Core.Main.ViewModels
{
    public class MainViewModel: Conductor<Screen>.Collection.OneActive
    {
        private readonly IEventAggregator eventAggregator;
        private readonly IWindowManager windowManager;

        MainViewModel()
        {
            //something important;
        }
        MainViewModel(IEventAggregator eventAggregator,
            IWindowManager windowManager)
        {
            this.eventAggregator = eventAggregator;
            this.eventAggregator.Subscribe(this);
            this.windowManager = windowManager;

            //something important
        }
    }
}

主视图：

<UserControl
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             x:Class="ChartsDisplayer2016.Core.Main.Views.MainView"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>

    </Grid>
</UserControl>

如何摆脱这个异常？

编辑：

将 MainViewModel 的访问修饰符更改为 public

Answer 1

您的 MainViewModel class 和构造函数没有访问说明符，因此它默认为私有。

    namespace ChartsDisplayer2016.Core.Main.ViewModels
    {

        public class MainViewModel: Conductor<Screen>.Collection.OneActive
        {

            private readonly IEventAggregator eventAggregator;
            private readonly IWindowManager windowManager;


            public MainViewModel()
            {
                //something important;
            }
            public MainViewModel(IEventAggregator eventAggregator,
                                 IWindowManager windowManager)
            {
                this.eventAggregator = eventAggregator;
                this.eventAggregator.Subscribe(this);
                this.windowManager = windowManager;

                //something important
            }
        }
    }

Bootstrapper DisplayRootFor<MV>() 异常：没有无参数构造函数

Bootstrapper DisplayRootFor<MV>() Exception: No parameterless constructor

c#

ninject

mvvm

bootstrapper

caliburn.micro