Windows phone开发初体验之(三)-参数传递

在上一节我们知道了如何处理Windows Phone的页面导航同时也实现了两个页面之间的数据传递。在实际开发中我们还需要为两个页面传递数据。经过看官方文档和网上资料搜集,总结参数传递主要有以下的四种方式:
1、通过NavigationContext的QueryString方式;
2、通过程序的App类设置全局变量(此方法可以传递对象);
3、通过NavigationEventArgs事件类的Content属性设置;
4、通过PhoneApplicationService类的State属性。
 
通过NavigationContext的QueryString方式这种方式在上一节已经介绍了,在些不再描述。下面重点介绍后面三种
 
(一)  通过程序的App 类设置全局变量( 此方法可以传递对象)
在工程目录下新建一个”Model”的文件夹,再在这个文件夹里新建一个类:Person类
public class Person
    {

        public String Name { get; set; }

        public int Age { get; set; }
 
    }
 
然后再在App.xaml.cs文件中加上这么一段代码
   public partial class App : Application
    {
        /// <summary>
        ///提供对电话应用程序的根框架的轻松访问。
        /// </summary>
        /// <returns>电话应用程序的根框架。</returns>
        public PhoneApplicationFrame RootFrame { get; private set; }

        public static Person person { get; set; }   ……..

}
 
再在新建的AppHome.xaml.cs文件中为页面上的按钮添加click事件

private void button1_Click(object sender, RoutedEventArgs e)

        {

            App.person = new Model.Person

            {
                Name=txt_Name.Text,
                Age=Convert.ToInt32(txt_Age.Text)
           
            };
 

            Uri uri = new Uri("/AppData.xaml",UriKind.Relative);

            NavigationService.Navigate(uri);
        }
 
然后在AppData.xaml文件的Loaded事件中接受传递过来的值:

private void LayoutRoot_Loaded(object sender, RoutedEventArgs e)

        {

            if (App.person!=null)

            {
                tb_Name.Text = App.person.Name;
                tb_Age.Text = App.person.Age.ToString();
            }
        }
 
最终实现效果:

 

 

 
 
 
 
(二) 通过NavigationEventArgs事件类的Content属性设置
 
ContentPage1.xaml.cs文件中:
protected override void OnNavigatedFrom(System.Windows.Navigation.NavigationEventArgs e)
        {

            var targetPage = e.Content as ContentPage2;

            if (targetPage != null)

            {

                targetPage.StrContent =textBox1.Text;

            }
        }
 

        private void button1_Click(object sender, RoutedEventArgs e)

        {
            NavigationService.Navigate(new Uri("/ContentPage2.xaml",UriKind.Relative));
        }
 
ContentPage2.xaml.cs中取出Content的值:
 

        public String StrContent { get; set; }

 

        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)

        {

            if (StrContent != null)

            {

                this.tb_ContentValue.Text = StrContent;

            }
        }
 
实现的效果:

 

 
(三) 通过PhoneApplicationService类的State属性:
StatePage1.xaml.cs文件:
 

  protected override void OnNavigatedFrom(System.Windows.Navigation.NavigationEventArgs e)

        {

            PhoneApplicationService phoneService = PhoneApplicationService.Current;

 
            phoneService.State["param1"] = this.textBox1.Text;
        }
 

        private void button1_Click(object sender, RoutedEventArgs e)

        {
            NavigationService.Navigate(new Uri("/StatePage2.xaml",UriKind.Relative));
        }
 
StatePage2.xaml.cs文件:
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
        {

            if (PhoneApplicationService.Current.State.ContainsKey("param1"))

            {

                this.tb_ParamValue.Text = PhoneApplicationService.Current.State["param1"] as string;

               
            }
        }
 

        private void button1_Click(object sender, RoutedEventArgs e)

        {

            if (NavigationService.CanGoBack)

            {
                NavigationService.GoBack();
            }
        }
 
实现效果:

 

 

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