如何在MVVM Light Toolkit中的另一个ViewModel中设置ViewModel中的属性

时间:2015-06-11 13:17:59

标签: c# wpf mvvm viewmodel

我有一个包含少量TextBox元素和进度条的表单。我希望在TextBox分配了一些值时更新进度条。

因此,当设置属性时,我尝试增加ProgressPercent,但实际上并不起作用。我错过了什么,为什么我无法从另一个ViewModel访问ProgressPercent

MainViewModel.cs

public class MainViewModel : ViewModelBase
{
    private int progressPercent { get; set; }

    public MainViewModel()
    {
    }

    public int ProgressPercent
    {
        get
        {
            return this.progressPercent;
        }
        set
        {
            this.progressPercent = value;
            this.RaisePropertyChanged(() => this.ProgressPercent);
        }
    }
}

FooterViewModel

public class FooterViewModel : ViewModelBase
{
    private string firstName { get; set; }
    private string lastName { get; set; }

    public FooterViewModel()
    {
    }

    public string FirstName
    {
        get
        {
            return this.firstName;
        }
        set
        {
            this.firstName = value;
            this.RaisePropertyChanged(() => this.FirstName);
            Window.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
            {
                ProgressPercent += 10; 
            });
        }
    }

    public string LastName
    {
        get
        {
            return this.lastName;
        }
        set
        {
            this.lastName = value;
            this.RaisePropertyChanged(() => this.LastName);
            Window.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
            {
                ProgressPercent += 10; 
            });
        }
    }
}

HeaderViewModel.cs

public class HeaderViewModel : ViewModelBase
{
    private string address { get; set; }
    private int age { get; set; }

    public HeaderViewModel()
    {
    }

    public string Address
    {
        get
        {
            return this.address;
        }
        set
        {
            this.address = value;
            this.RaisePropertyChanged(() => this.Address);
            Window.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
            {
                ProgressPercent += 10; 
            });
        }
    }

    public int Age
    {
        get
        {
            return this.age;
        }
        set
        {
            this.age = value;
            this.RaisePropertyChanged(() => this.Age);
            Window.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
            {
                ProgressPercent += 10; 
            });
        }
    }
}

问题Accessing a property in one ViewModel from another没有什么不同,但由于某种原因,那里的解决方案对我不起作用

实际上答案就在这里 Accessing Properties in other ViewModels in MVVM Light

1 个答案:

答案 0 :(得分:0)

您通常必须使用某种类型的通信基础设施来在ViewModel之间进行通信。您是否正在使用具有此内置脚手架的任何类型的Mediator或MVVM Framework?

或者,您可以在类中设置一个属性,使其可以访问所有属性,并且可以引发其他ViewModel订阅的事件。