在很多时候，我们是希望手机app是要和服务端关联，并获取服务端的数据的，本篇博文我们看一下在xmarin下，怎么和用web api的方式与服务端连接并获取数据。
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首先看web api的开发，本实例是用Visual Studio 2013 with update 4开发
然后创建一个实体类City
public class City
{
public int Code
{ get; set; }
public string Name
{ get; set; }
}
再创建一个WebApiController
[RoutePrefix("api")]
public class TestController : ApiController
{
[HttpGet]
[Route("citys")]//通过路由设计为citys
public IHttpActionResult GetCitys()
{
var citys = new List
new City(){ Code=1,Name="北京"},
new City(){Code=2,Name="天津"}
};
return Json(citys);//通过Json方式返回数据
}
[HttpPost]//设定请求方式为get请求
[Route("login")]//通过路由设计为citys
public IHttpActionResult SaveUser(string UserName, string Password)
{
if (UserName == "aaa" && Password == "bbb")
{
return Ok(1);
}
else
{
return Ok(0);
}
}
}
并键一点是要把webapi项目布署到IIS上，本例访问地址是：http://192.168.1.106/api
Android端
创建一个Android的空项目。
右击项目，“管理Nuget程序包”，查Restsharp for Android，并安装
新建一个窗体，axml如下：
android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> android:text="确定" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/But1" /> android:inputType="textMultiLine" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/username" /> android:inputType="textMultiLine" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/password" /> android:text="确定" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/But2" /> 后端代码如下： 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 but2 = FindViewById EditText username_et = FindViewById EditText password_et = FindViewById 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 RunOnUiThread(() => Toast.MakeText(this, "获取成功!" + citys.Count, ToastLength.Short).Show()); } else { RunOnUiThread(() => Toast.MakeText(this, "获取失败：" + 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); //输入参数 request.AddParameter("UserName", username_et.Text, ParameterType.QueryString); request.AddParameter("Password", password_et.Text, ParameterType.QueryString); //上传结果回调函数 client.ExecuteAsync(request, resp => { if (resp.StatusCode == HttpStatusCode.OK) { var v = resp.Content; if (v == "1") { RunOnUiThread(() => Toast.MakeText(this, "登录成功", ToastLength.Short).Show()); } else { RunOnUiThread(() => Toast.MakeText(this, "登录失败：" + resp.StatusCode.ToString(), ToastLength.Short).Show()); } } else { RunOnUiThread(() => Toast.MakeText(this, "获取失败：" + resp.StatusCode.ToString(), ToastLength.Short).Show()); } }); }; } } public class City { public int Code { get; set; } public string Name { get; set; } } } IPhone端 对于IOS开发，也是同样的，在Visual Studio中新建一个IPhone的应用。 这时要求连接一Mac作为Build Host 这里我设置的是我的mac系统 同时打开Mac上的xamarin.ios build host，开始配对 在开发端输入mac端生成的pin码 开始配对，这里要注意你的visual studio所在的windows要与 build host所在的mac处于同一个局域网内。 右键IOS项目，打开nuget，安装Restsharp for ios 还有另一个办法来添加RestSharp引用，打开下面网址 https://github.com/restsharp/RestSharp 下载程序包 重新编译RestSharp.IOS，并把bin目录中生成(最好是Release下)的RestSharp.IOS.dll引用到当前的IOS项目中。 打开IOS项目中的MainStoryboard.storyboard，添加两个按钮MyBut1和MyBut2，和两个文本框，分别是UserName_TB和Password_TB 后台Controller中的代码如下： 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); //输入参数 request.AddParameter("UserName", UserName_TB.Text, ParameterType.QueryString); request.AddParameter("Password", Password_TB.Text, ParameterType.QueryString); //上传结果回调函数 client.ExecuteAsync(request, resp => { if (resp.StatusCode == HttpStatusCode.OK) { var v = resp.Content; if (v == "1") { InvokeOnMainThread(delegate { var alert = new UIAlertView("提示", "登录成功：", new AlertDelegate(), "确定"); alert.Show(); }); } else { InvokeOnMainThread(delegate { var alert = new UIAlertView("提示", "登录失败：", new AlertDelegate(), "确定"); alert.Show(); }); } } else { InvokeOnMainThread(delegate { var alert = new UIAlertView("提示", "登录成功：" + resp.StatusCode.ToString(), new AlertDelegate(), "确定"); 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 InvokeOnMainThread(delegate { var alert = new UIAlertView("提示", "获取成功：" + citys.Count, new AlertDelegate(), "确定"); alert.Show(); }); } else { InvokeOnMainThread(delegate { var alert = new UIAlertView("提示", "获取失败！", new AlertDelegate(), "确定"); 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) { //确定处理代码 } else { //取消处理代码 } } } } public class City { public int Code { get; set; } public string Name { get; set; } } } 这时你会发现，Android和IOS中的请求RestSharp的代码是一致的。 效果如下： Demo下载
文章标题：Xamarin只言片语2——Xamarin下的webapi操作
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