UWP使用AppService向另一個UWP用戶端應用程式提供服務

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在上篇裡，我使用的是寄宿在WPF上的WCF進行兩個程式間的通訊，在解決問題的同時，我的同事也在思考能否使用UWP來做這件事。於是，我們發現了App Service，兩個UWP應用溝通的橋樑。

App Service以background task 的形式允許一個UWP向其它UWP提供服務。

首先我們建立一個名為"MyCalculatorService"的Windows Runtime Component項目，建立Calculator類，實現 IBackgroundTask.介面，它很類似WCF裡的ServiceContract。

public sealed class Calculator : IBackgroundTask{private BackgroundTaskDeferral backgroundTaskDeferral;private AppServiceConnection appServiceConnection;public void Run(IBackgroundTaskInstance taskInstance){this.backgroundTaskDeferral = taskInstance.GetDeferral();var details = taskInstance.TriggerDetails as AppServiceTriggerDetails;appServiceConnection = details.AppServiceConnection;appServiceConnection.RequestReceived += OnRequestReceived;taskInstance.Canceled += OnTaskCanceled;}private async void OnRequestReceived(AppServiceConnection sender, AppServiceRequestReceivedEventArgs args){var messageDeferral = args.GetDeferral();ValueSet message = args.Request.Message;ValueSet returnData = new ValueSet();string command = message["Command"] as string;      //Add, Subtract, Multiply, Divideint? firstNumber = message["Input1"] as int?;int? secondNumber = message["Input2"] as int?;int? result = 0;if (firstNumber.HasValue && secondNumber.HasValue){switch (command){case "Add":{result = firstNumber + secondNumber;returnData.Add("Result", result.ToString());returnData.Add("Status", "Complete");break;}case "Subtract":{result = firstNumber - secondNumber;returnData.Add("Result", result.ToString());returnData.Add("Status", "Complete");break;}case "Multiply":{result = firstNumber * secondNumber;returnData.Add("Result", result.ToString());returnData.Add("Status", "Complete");break;}case "Divide":{result = firstNumber / secondNumber;returnData.Add("Result", result.ToString());returnData.Add("Status", "Complete");break;}default:{returnData.Add("Status", "Fail: unknown command");break;}}}await args.Request.SendResponseAsync(returnData);messageDeferral.Complete();}private void OnTaskCanceled(IBackgroundTaskInstance sender, BackgroundTaskCancellationReason reason){if (this.backgroundTaskDeferral != null){this.backgroundTaskDeferral.Complete();}}}

　　然後再建立一個名為MyCalculatorServiceProvider的UWP程式，充當服務端角色，相當於WCF宿主服務的。引用剛才我們建立的wind，然後在 Package.appxmanifest 中聲明一個 名為CalculatorService1的App Service 執行個體，添加 進入點"MyCalculatorService.Calculator"。

現在我們來建立名為“CalculatorClient”的用戶端，並調用以上服務。添加以下代碼

public sealed partial class MainPage : Page    {    private AppServiceConnection calculatorService;    public MainPage()        {            this.InitializeComponent();        }    private async void button_Click(object sender, RoutedEventArgs e)    {        //Add the connection        if (calculatorService == null)        {            calculatorService = new AppServiceConnection();            calculatorService.AppServiceName = "CalculatorService1";            calculatorService.PackageFamilyName = "83da5395-2473-49fb-b361-37072e87e9b9_xe3s0d4n4696a";            var status = await calculatorService.OpenAsync();            if (status != AppServiceConnectionStatus.Success)            {                Result.Content = "Failed to connect";                return;            }        }        //Call the service        int num1 = int.Parse(InputtextBox1.Text);        int num2 = int.Parse(InputtextBox2.Text);        var message = new ValueSet();        message.Add("Command", Operation.SelectionBoxItem);        message.Add("Input1", num1);        message.Add("Input2", num2);        AppServiceResponse response = await calculatorService.SendMessageAsync(message);        string result = "";        if (response.Status == AppServiceResponseStatus.Success)        {            //Get the data that the service sent            if (response.Message["Status"] as string == "Complete")            {                result = response.Message["Result"] as string;            }        }        message.Clear();        ResulttextBlock.Text = result;    }    }

注意其中的AppServiceName是我們在MyCalculatorServiceProvider項目中定義的App Service的Name，PackageFamilyName 是MyCalculatorServiceProvider項目的PackageFamilyName。

完成後，先部署MyCalculatorServiceProvider再部署CalculatorClient，效果是不是跟WCF很類似呢？

好吧，以上都是我從https://social.technet.microsoft.com/wiki/contents/articles/36719.wcf-app-services-in-universal-windows-platform-uwp-using-windows-10.aspx抄的，，，

樣本demo可以從這裡下http://www.cnblogs.com/luquanmingren/p/7692305.html，沒錯，我就是懶

 

UWP使用AppService向另一個UWP用戶端應用程式提供服務