Question

我使用棱镜6.1。我在ConfigureContainer类的Bootstrapper方法中设置了Unity配置。但是，当Prism框架尝试调用View模型时，它无法创建它，并抛出异常'没有为此对象定义的无参数构造函数。'。

Bootstrapper.cs

public class Bootstrapper: UnityBootstrapper
{
    ...
    protected override void ConfigureContainer()
    {
        base.ConfigureContainer();
        this.Container.RegisterType<IMyService, MyService>(new ContainerControlledLifetimeManager());
        this.Container.RegisterType<MyFormViewModel>(new ContainerControlledLifetimeManager());
    }
    ...
}

MyFormModule.cs

public class MyFormModule : IModule
{
    private readonly IRegionViewRegistry regionViewRegistry;

    public SkypeActionModule(IRegionViewRegistry registry)
    {
        this.regionViewRegistry = registry;
    }

    public void Initialize()
    {
        regionViewRegistry.RegisterViewWithRegion("MainRegion", typeof(Views.MyFormView));
    }
}

MyFormViewModel.cs

public class MyFormViewModel : BindableBase
{
    private readonly IMyService myService;

    public SkypeActionViewModel(IMyService myService)
    {
        this.myService = myService;
    }
    ...
}

在此行中抛出异常：

regionViewRegistry.RegisterViewWithRegion("MainRegion", typeof(Views.MyFormView));

在prism documentation中解释了如何配置统一，但这是在Module类中（在我的例子中是MyFormModule）。我不明白，因为通过这种方式，我需要在每个模块中配置它，并且我的模块类中没有对象this.container.RegisterType。

在其他链接中，我发现了一些类似于“MEF”配置的配置，其中“DI”配置在ConfigureContainer方法中。但它对我的配置不起作用，或者我的配置中缺少的东西。

修改我在我的模块类中包含了容器。但我有同样的问题。我认为这是正常的，因为问题在于Prism创建视图模型类MyFormViewModel。

public class MyFormModule : IModule
{
    private readonly IRegionViewRegistry regionViewRegistry;

    private readonly IUnityContainer container;

    public MyFormModule(IRegionViewRegistry registry, IUnityContainer container)
    {
        this.regionViewRegistry = registry;

        this.container = container;
    }

    public void Initialize()
    {
        this.container.RegisterType<IMyService, MyService>(new ContainerControlledLifetimeManager());

        this.container.RegisterType<MyFormViewModel>();

        this.container.RegisterType<MyFormView>();

        regionViewRegistry.RegisterViewWithRegion("MainRegion", typeof(MyFormView));
    }
}

修改

解决方案：我在this question on stackoverflow

中找到了解决方案

在BindViewModelToView类：

上创建方法Bootstrap

public void BindViewModelToView<TViewModel, TView>()
{
    ViewModelLocationProvider.Register(typeof(TView).ToString(), () => Container.Resolve<TViewModel>());
}

然后，在ConfigureViewModelLocator类的方法Bootstrap中调用所有视图模型将其与视图绑定：

protected override void ConfigureViewModelLocator()
{
    BindViewModelToView<ViewAVM, ViewA>();
    BindViewModelToView<ViewAVM, ViewB>();
}

Answer 1

你如何告诉棱镜创建视图模型？您使用的是from tkinter import * import tkinter.font import RPi.GPIO as GPIO import time GPIO Setup GPIO.setwarnings(False) GPIO.setmode(GPIO.BOARD) GPIO.setup(16, GPIO.OUT) # Water Pump GPIO.setup(18, GPIO.IN) # Tank Float Switch GPIO.output(16, GPIO.LOW) time_to_run = 60 # time to run the pump in seconds time_running = time.time() - 1 #Window Setup win = Tk() win.title("Pump Test") win.geometry("150x150+0+0") #Label Setup Label (win, text="Water System", fg="red", bg="black", font="24").grid(row=0, column=0) #Functions def off(): WTR.config(text="LOW WATER", bg="red") GPIO.output(16, GPIO.LOW) def wtr(): global time_running time_running = time.time() + time_to_run if GPIO.input(18) and not GPIO.input(16): pump_on() elif GPIO.input(16): pump_off() def pump_on(): WTR.config(text="Water", bg="green") GPIO.output(16, GPIO.HIGH) # added to turn the pump off manualy def pump_off(): WTR.config(text="Water", bg="grey") GPIO.output(16, GPIO.LOW) def check_pump(): # if the water level goes low turn the pump off # and show low water level if not GPIO.input(18): off() # if a set time has passed then shut the pump off it it is running if time_running <= time.time() and GPIO.input(16): pump_off() win.after(100, check_pump) # call this function every 100 miliseconds #Buttons WTR = Button(win, text="Water", bg="grey", command = wtr, height = 2, width = 8) WTR.grid(row=1, column=0) #Water Pump Control check_pump() # must be called once to start the after function mainloop()吗？

如果是这样，你想做类似

的事情

ViewModelLocator.AutoWireViewModel="True"

在引导程序中，以确保您的容器用于解析视图模型...

Unity Bootstrapper我的配置容器在调用View Model时不起作用

1 个答案: