如何传递从XAML参数？ [英] How do you pass parameters from xaml?

问题描述

我已经创建了自己的用户控件ClockControl，这是我通过主窗口的XAML初始化。

I have created my own UserControl "ClockControl", which I initialize through the main window's XAML.

唯一的问题是，我有一个参数传递到时钟控制的构造，我有没有我的线索我怎么能做到这一点。

The only problem is that I have to pass a parameter to the constructor of the clock control, and I have no clue of I how I can do that.

这工作，如果我没有参数：

This works if I have no parameters:

<myControl:ClockControl></myControl:ClockControl>

但我怎么能传递一个参数，这样做呢？

But how can I pass a parameter doing this?

下面是构造函数：

public ClockControl(String city)
    {
        InitializeComponent();
        this.initController();
        ......
        .....
    }

先谢谢了。

推荐答案

您的构造函数：

public ClockControl(String city)
{
    InitializeComponent();
    this.initController();
    //...
}

首先，如果你想使用 ClockControl 从XAML，那么你需要一个默认的构造函数，是指一个构造函数，不带任何参数。所以上面的构造函数行不通的。

First of all, if you want to use ClockControl from XAML, then you need a default constructor, means a constructor which doesn't take any parameter. So the above constructor is not going to work.

我建议你定义一个名称的属性城市，preferably依赖属性，然后用它从XAML。事情是这样的：

I would suggest you to define a property with name City, preferably dependency property, and then use it from XAML. Something like this:

public class ClockControl: UserControl
    {
        public static readonly DependencyProperty CityProperty = DependencyProperty.Register
            (
                 "City", 
                 typeof(string), 
                 typeof(ClockControl), 
                 new PropertyMetadata(string.Empty)
            );

        public string City
        {
            get { return (string)GetValue(CityProperty); }
            set { SetValue(CityProperty, value); }
        }

        public ClockControl()
        {
            InitializeComponent();
        }
        //..........
}

然后就可以在XAML中这样写：

Then you can write this in XAML:

<myControl:ClockControl City="Hyderabad" />

由于城市是一个依赖属性，这意味着你甚至可以做绑定是这样的：

Since City is a dependency property, that means you can even do Binding like this:

<myControl:ClockControl City="{Binding Location}" />

希望，解决您的问题！

Hope, that solves your problem!

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