在WPF中使用几个子对象初始化的ObservableCollection属性 [英] ObservableCollection property initialized with a few children in WPF

问题描述

我们有一个WPF自定义控件，该控件具有名为 Persons 的 ObservableCollection< Person> 属性，一旦在WPF窗口上添加了自定义控件，生成的XAML就代表一个XAML行是我们的自定义控件.

We have a WPF custom control with an ObservableCollection<Person> property called Persons, once we add the custom control on the WPF window, the generated XAML represent a single XAML line of our custom control.

要使Persons集合的XAML已经包含一些项目(例如Paul，Sarah和John)，我们需要做什么?

What do we need to do to have XAML of the Persons collection that already contains some items, like Paul, Sarah and John?

很长一段时间我们一直在研究如何成功实现这一目标.

It's a long time we study how to implement this without success.

谢谢.

我们现在所拥有的:

<MyCustomControl Height="228" Margin="45,30,0,0" Width="369" />     

我们希望得到的:

<MyCustomControl Height="228" Margin="45,30,0,0" Width="369" />
    <MyCustomControl.Persons>
        <Person Name="Paul">
        <Person Name="Sarah">
        <Person Name="John">
   </MyCustomControl.Persons>
</MyCustomControl>

推荐答案

只需将其添加到初始化中即可:

Just add it to the initialization:

public partial class CustomControl1 : UserControl
{
    public CustomControl1(bool addDummies = false)
    {
        this.InitializeComponents();

        this.Persons = new ObservableCollection<Person>();

        if (addDummies)
        {
            this.Persons.Add(new Person() { Name = "Sarah" });
            // etc
        }
    }
}

或者更好的是，也使用视图模型来绑定您的控件，并创建一个虚拟的视图模型以进行测试.传递那个而不是真实的视图模型.

Or better, use a view model to bind your control too, and create a dummy view model for testing purposes. Pass that one in instead of the real view model.

如果要将其添加到xaml，首先必须在标头中声明名称空间:

If you want to add it to the xaml, you first have to declare your namespace in the header:

xmlns:custom="clr-namespace:YourNamespace.InWhichThePersonClassIs"

然后在声明中使用它:

<custom:Person Name="Paul">

这篇关于在WPF中使用几个子对象初始化的ObservableCollection属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！