如何报告实体对象的自定义（添加）计算属性已更改？

发布于 2024-09-17 05:49:58 字数 524 浏览 4 评论 0原文

首先，我为我的低水平英语写作表示歉意。

我在 WPF MVVM 项目中使用实体框架和数据绑定。我想知道将数据绑定到使用实体框架生成的 EntityObject 的添加计算属性的最佳方法是什么。

例如：

partial class Person
{
    partial string Name...

    partial string Surname...

    public string FullName
    {
        get { return Name + Surname; }
    }
}

然后在 XAML 中类似 ...Text="{Binding FullName, Mode=Twoway}"

此时我的 GUI 不知道属性 FullName 何时更改...我如何通知它？我尝试过使用 ReportPropertyChanged 但它返回一个错误...

另外，我想知道当一个绑定依赖于更多属性时实现绑定的最佳方法是什么...计算属性或值转换器或不同的东西？

原文

First, I apologize for my low level English writing.

I use Entity Framework and data-binding in WPF MVVM project.
I would like to know what is the best way to do data binding to added calculated property of EntityObject which is generated with Entity Framework.

For example:

partial class Person
{
    partial string Name...

    partial string Surname...

    public string FullName
    {
        get { return Name + Surname; }
    }
}

And then in XAML something like ...Text="{Binding FullName, Mode=Twoway}"

At this point my GUI doesn't know when property FullName is changed... how can I notify it?
I've tried with ReportPropertyChanged but it return's an error...

Also, I wonder what is the best way to implement binding when one binding depends on more properties...calculated properties or value converters or something different?

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烏雲後面有陽光 2024-09-24 05:49:58

您可以在构造函数中订阅 PropertyChanged 事件，如果属性名称与两个源属性之一匹配，则引发计算出的属性的事件。

public Person()
{
    this.PropertyChanged += (o, e) =>
        {
            if (e.PropertyName == "Name" || e.PropertyName == "Surname") OnPropertyChanged("FullName");
        };
}

You could subscribe to the PropertyChanged event in the constructor and if the property name matches either of the two source properties, raise the event for the calculated one.

public Person()
{
    this.PropertyChanged += (o, e) =>
        {
            if (e.PropertyName == "Name" || e.PropertyName == "Surname") OnPropertyChanged("FullName");
        };
}

回复收藏 0 原文

不打扰别人 2024-09-24 05:49:58

我不确定你是否正在寻找这种东西：

public string FullName
{
    get { return Name + Surname; }
    set 
    {
        // You should do some validation while and before splitting the value
        this.Name = value.Split(new []{' '})[0];
        this.Surname = value.Split(new []{' '})[1];
    }
}

I am not sure if you are looking for this kind of thing:

public string FullName
{
    get { return Name + Surname; }
    set 
    {
        // You should do some validation while and before splitting the value
        this.Name = value.Split(new []{' '})[0];
        this.Surname = value.Split(new []{' '})[1];
    }
}

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~没有更多了~