Xamarin只言片语2――Xamarin下的web api操作
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。
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<City>() {
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：
<?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="确定"
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="确定"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/But2" />
</LinearLayout>
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>(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, "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<List<City>>(v);
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