在UWP页面之间传递一些参数 [英] Pass some parameters between pages in UWP

问题描述

我尝试将一些Windows Phone 8项目移植到当前的UWP，并陷入我在旧项目中使用的摘要代码中。

I try to port some Windows Phone 8 projects to current UWP, and get stucked in this snippet code that I've used in old project.

private void Restaurant_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
    string types = "restaurant";
    string title = "restaurant";
    string url = string.Format("/NearbyPlaces.xaml?latitude={0}&longitude={1}&types={2}&title={3}", LocationLatitude.Text, LocationLangitude.Text, types, title);
    NavigationService.Navigate(new Uri(url, UriKind.Relative));
}

在该代码中，我使用NavigationService将一些参数传递给另一个页面。我无法再使用NaigationService，因为UWP不支持它。我曾在UWP项目中尝试使用此功能，但我认为它仅支持传递一个参数CMIIW。

In that code, I used NavigationService to pass some parameters to another page. I couldn't use NaigationService anymore because UWP doesn't support it. I've tried using this in my UWP project, but I think it only supported for passing one parameter, CMIIW.

private void restaurant_tapped(object sender, TappedRoutedEventArgs e)
{
    string types = "restaurant";
    string title = "restaurant";
    Frame.Navigate(typeof(placeResult), latLoc.Text, longLoc.Text, types, title);
}

该代码给我一个错误，因为它需要5个参数，即+ 2个重载。我的问题是如何以适当的方式在UWP项目中传递一些参数？

That code give me an error, because it takes 5 arguments, which is +2 overloads. My question is how to do in proper way to passing some parameters in UWP project?

推荐答案

您在Windows（电话）中传递的内容8只是一个简单的 string ，其中包含您的所有参数。您必须在目标页面的 OnNavigatedTo（）方法中对其进行解析。当然，您仍然可以这样做，并将字符串传递给 Frame.Navigate（）方法。

What you passed in Windows (Phone) 8 has just been a simple string that included all your parameters. You had to parse them in the OnNavigatedTo() method of your target page. Of course you can still do that and pass a string to the Frame.Navigate() method.

UWP可以将完整的对象传递给其他页面。那么，为什么不创建一个包含所有参数的小类并传递其实例呢？

But since UWP you can pass complete objects to other pages. So why don't you create a small class that includes all your parameters and pass an instance of that?

您的类可能看起来像：

public class RestaurantParams
{
    public RestaurantParams(){}
    public string Name { get; set; }
    public string Text { get; set; }
    // ...
}

，然后通过：

var parameters = new RestaurantParams();
parameters.Name = "Lorem ipsum";
parameters.Text = "Dolor sit amet.";
// ...

Frame.Navigate(typeof(PageTwo), parameters);

在下一页上，您现在可以通过以下方式访问它们：

On your next page you can now access them via:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    base.OnNavigatedTo(e);

    var parameters = (RestaurantParams)e.Parameter;

    // parameters.Name
    // parameters.Text
    // ...
}

其中Parameter是检索参数的函数。

Where Parameter is the function that retrieves the arguments.

希望有帮助。

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