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Xamarin只言片语2——Xamarin下的web api操作

發布時間：2025/4/5 编程问答 24 豆豆

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在很多時候，我們是希望手機app是要和服務端關聯，并獲取服務端的數據的，本篇博文我們看一下在xmarin下，怎么和用web api的方式與服務端連接并獲取數據。

首先看web api的開發，本實例是用Visual Studio 2013 with update 4開發

然后創建一個實體類City

public?class?City

?????public?int?Code

?????{?get;?set;?}

?????public?string?Name

?????{?get;?set;?}

再創建一個WebApiController

????[RoutePrefix("api")]

public?class?TestController?:?ApiController

{

????[HttpGet]

????[Route("citys")]//通過路由設計為citys

????public?IHttpActionResult?GetCitys()

????{

????????var?citys?=?new?List<City>()?{

????????new?City(){?Code=1,Name="北京"},

????????new?City(){Code=2,Name="天津"}

????????};

????????return?Json(citys);//通過Json方式返回數據

????}

????[HttpPost]//設定請求方式為get請求

????[Route("login")]//通過路由設計為citys

????public?IHttpActionResult?SaveUser(string?UserName,?string?Password)

????{

????????if?(UserName?==?"aaa"?&&?Password?==?"bbb")

????????{

????????????return?Ok(1);

????????}

????????else

????????{

????????????return?Ok(0);

????????}

????}

}

并鍵一點是要把webapi項目布署到IIS上，本例訪問地址是：http://192.168.1.106/api

Android端

創建一個Android的空項目。

右擊項目，“管理Nuget程序包”，查Restsharp for Android，并安裝

新建一個窗體，axml如下：

<?xml?version="1.0"?encoding="utf-8"?>

<LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"

????android:orientation="vertical"

????android:layout_width="fill_parent"

????android:layout_height="fill_parent">

????<Button

????????android:text="確定"

????????android:layout_width="match_parent"

????????android:layout_height="wrap_content"

????????android:id="@+id/But1"?/>

????<EditText

????????android:inputType="textMultiLine"

????????android:layout_width="match_parent"

????????android:layout_height="wrap_content"

????????android:id="@+id/username"?/>

????<EditText

????????android:inputType="textMultiLine"

????????android:layout_width="match_parent"

????????android:layout_height="wrap_content"

????????android:id="@+id/password"?/>

????<Button

????????android:text="確定"

????????android:layout_width="match_parent"

????????android:layout_height="wrap_content"

????????android:id="@+id/But2"?/>

</LinearLayout>

后端代碼如下：

using?System;

using?Android.App;

using?Android.Content;

using?Android.Runtime;

using?Android.Views;

using?Android.Widget;

using?Android.OS;

using?RestSharp;

using?System.Net;

using?System.Collections.Generic;?

namespace?WebApiAndroid

{

????[Activity(Label?=?"WebApiAndroid",?MainLauncher?=?true,?Icon?=?"@drawable/icon")]

????public?class?MainActivity?:?Activity

????{

????????protected?override?void?OnCreate(Bundle?bundle)

????????{

????????????base.OnCreate(bundle);?

????????????SetContentView(Resource.Layout.Main);?

????????????Button?but1?=?FindViewById<Button>(Resource.Id.But1);

????????????Button?but2?=?FindViewById<Button>(Resource.Id.But2);

????????????EditText?username_et?=?FindViewById<EditText>(Resource.Id.username);

????????????EditText?password_et?=?FindViewById<EditText>(Resource.Id.password);

????????????but1.Click?+=?delegate

????????????{

????????????????RestClient?client?=?new?RestClient(@"http://192.168.1.106/api/");

????????????????RestRequest?request?=?new?RestRequest(@"citys",?Method.GET);

????????????????client.ExecuteAsync(request,?resp?=>

????????????????{

????????????????????if?(resp.StatusCode?==?HttpStatusCode.OK)

????????????????????{

????????????????????????var?v?=?resp.Content;

????????????????????????var?citys?=?SimpleJson.DeserializeObject<List<City>>(v);

????????????????????????RunOnUiThread(()?=>?Toast.MakeText(this,?"獲取成功!"?+?citys.Count,?ToastLength.Short).Show());

????????????????????}

????????????????????else

????????????????????{

????????????????????????RunOnUiThread(()?=>?Toast.MakeText(this,?"獲取失敗："?+?resp.StatusCode.ToString(),?ToastLength.Short).Show());

????????????????????}

????????????????});?

????????????};?

????????????but2.Click?+=?delegate

????????????{

????????????????RestClient?client?=?new?RestClient(@"http://192.168.1.106/api/");

????????????????RestRequest?request?=?new?RestRequest(@"login",?Method.POST);

????????????????//輸入參數

????????????????request.AddParameter("UserName",?username_et.Text,?ParameterType.QueryString);

????????????????request.AddParameter("Password",?password_et.Text,?ParameterType.QueryString);

????????????????//上傳結果回調函數

????????????????client.ExecuteAsync(request,?resp?=>

????????????????{

????????????????????if?(resp.StatusCode?==?HttpStatusCode.OK)

????????????????????{

????????????????????????var?v?=?resp.Content;

????????????????????????if?(v?==?"1")

????????????????????????{

????????????????????????????RunOnUiThread(()?=>?Toast.MakeText(this,?"登錄成功",?ToastLength.Short).Show());

????????????????????????}

????????????????????????else

????????????????????????{

????????????????????????????RunOnUiThread(()?=>?Toast.MakeText(this,?"登錄失敗："?+?resp.StatusCode.ToString(),?ToastLength.Short).Show());

????????????????????????}

????????????????????}

????????????????????else

????????????????????{

????????????????????????RunOnUiThread(()?=>?Toast.MakeText(this,?"獲取失敗："?+?resp.StatusCode.ToString(),?ToastLength.Short).Show());

????????????????????}

????????????????});?

????????????};

????????}

????}?

????public?class?City

????{

????????public?int?Code

????????{?get;?set;?}?

????????public?string?Name

????????{?get;?set;?}?

????}

}

IPhone端

對于IOS開發，也是同樣的，在Visual Studio中新建一個IPhone的應用。

這時要求連接一Mac作為Build Host

這里我設置的是我的mac系統

同時打開Mac上的xamarin.ios build host，開始配對

在開發端輸入mac端生成的pin碼

開始配對，這里要注意你的visual studio所在的windows要與?build host所在的mac處于同一個局域網內。

右鍵IOS項目，打開nuget，安裝Restsharp for ios

還有另一個辦法來添加RestSharp引用，打開下面網址

https://github.com/restsharp/RestSharp

下載程序包

重新編譯RestSharp.IOS，并把bin目錄中生成(最好是Release下)的RestSharp.IOS.dll引用到當前的IOS項目中。

打開IOS項目中的MainStoryboard.storyboard，添加兩個按鈕MyBut1和MyBut2，和兩個文本框，分別是UserName_TB和Password_TB

后臺Controller中的代碼如下：

using?System;

using?System.Drawing;?

using?Foundation;

using?UIKit;

using?RestSharp;

using?System.Net;

using?System.Collections.Generic;?

namespace?WebApiIPhone

{

????public?partial?class?RootViewController?:?UIViewController

????{

????????public?RootViewController(IntPtr?handle)

????????????:?base(handle)

????????{

????????}?

????????public?override?void?DidReceiveMemoryWarning()

????????{

????????????base.DidReceiveMemoryWarning();

????????}?

????????#region?View?lifecycle?

????????public?override?void?ViewDidLoad()

????????{

????????????base.ViewDidLoad();?

????????????MyBut1.TouchUpInside?+=?MyBut1_TouchUpInside;

????????????MyBut2.TouchUpInside?+=?MyBut2_TouchUpInside;

????????}

????????void?MyBut2_TouchUpInside(object?sender,?EventArgs?e)

????????{

????????????RestClient?client?=?new?RestClient(@"http://192.168.1.106/api/");

????????????RestRequest?request?=?new?RestRequest(@"login",?Method.POST);

????????????//輸入參數

????????????request.AddParameter("UserName",?UserName_TB.Text,?ParameterType.QueryString);

????????????request.AddParameter("Password",?Password_TB.Text,?ParameterType.QueryString);

????????????//上傳結果回調函數

????????????client.ExecuteAsync(request,?resp?=>

????????????{

????????????????if?(resp.StatusCode?==?HttpStatusCode.OK)

????????????????{

????????????????????var?v?=?resp.Content;

????????????????????if?(v?==?"1")

????????????????????{

????????????????????????InvokeOnMainThread(delegate

????????????????????????????{

????????????????????????????????var?alert?=?new?UIAlertView("提示",?"登錄成功：",?new?AlertDelegate(),?"確定");

????????????????????????????????alert.Show();

????????????????????????????});

????????????????????}

????????????????????else

????????????????????{

????????????????????????InvokeOnMainThread(delegate

????????????????????????????{

????????????????????????????????var?alert?=?new?UIAlertView("提示",?"登錄失敗：",?new?AlertDelegate(),?"確定");

????????????????????????????????alert.Show();

????????????????????????????});

????????????????????}

????????????????}

????????????????else

????????????????{

????????????????????InvokeOnMainThread(delegate

???????????????????{

???????????????????????var?alert?=?new?UIAlertView("提示",?"登錄成功："?+?resp.StatusCode.ToString(),?new?AlertDelegate(),?"確定");

???????????????????????alert.Show();

???????????????????});?

????????????????}

????????????});

????????}?

????????void?MyBut1_TouchUpInside(object?sender,?EventArgs?e)

????????{

????????????RestClient?client?=?new?RestClient(@"http://192.168.1.106/api/");

????????????RestRequest?request?=?new?RestRequest(@"citys",?Method.GET);

????????????client.ExecuteAsync(request,?resp?=>

????????????{

????????????????if?(resp.StatusCode?==?HttpStatusCode.OK)

????????????????{

????????????????????var?v?=?resp.Content;

????????????????????var?citys?=?SimpleJson.DeserializeObject<List<City>>(v);

????????????????????InvokeOnMainThread(delegate

????????????????????{

????????????????????????var?alert?=?new?UIAlertView("提示",?"獲取成功："?+?citys.Count,?new?AlertDelegate(),?"確定");

????????????????????????alert.Show();

????????????????????});?

????????????????}

????????????????else

????????????????{

????????????????????InvokeOnMainThread(delegate

????????????????????{

????????????????????????var?alert?=?new?UIAlertView("提示",?"獲取失敗！",?new?AlertDelegate(),?"確定");

????????????????????????alert.Show();

????????????????????});

????????????????}

????????????});?

????????}?

????????public?override?void?ViewWillAppear(bool?animated)

????????{

????????????base.ViewWillAppear(animated);

????????}?

????????public?override?void?ViewDidAppear(bool?animated)

????????{

????????????base.ViewDidAppear(animated);

????????}?

????????public?override?void?ViewWillDisappear(bool?animated)

????????{

????????????base.ViewWillDisappear(animated);

????????}?

????????public?override?void?ViewDidDisappear(bool?animated)

????????{

????????????base.ViewDidDisappear(animated);

????????}?

????????#endregion?

????????public?class?AlertDelegate?:?UIAlertViewDelegate

????????{

????????????public?override?void?Clicked(UIAlertView?alertview,?nint?buttonIndex)

????????????{

????????????????if?(buttonIndex?==?0)

????????????????{

????????????????????//確定處理代碼

????????????????}

????????????????else

????????????????{

????????????????????//取消處理代碼

????????????????}

????????????}

????????}?

????}?

????public?class?City

????{

????????public?int?Code

????????{?get;?set;?}

????????public?string?Name

????????{?get;?set;?}?

????}

}

這時你會發現，Android和IOS中的請求RestSharp的代碼是一致的。

效果如下：

Demo下載

本文轉自桂素偉51CTO博客，原文鏈接：?http://blog.51cto.com/axzxs/1620497，如需轉載請自行聯系原作者

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