C#访问web api获取json数据并对其进行解析

C#访问web api获取json数据并对其进行解析

C#访问web api并获取json数据

1. 引用命名空间

using System.Net;  //访问网络
using System.IO;   //接收流数据

2. 创建WebRequest对象，使用静态方法Create(url)

string url = "https://restapi.amap.com/v3/weather/weatherInfo?city=110101&key=84567e9a80aaa95b24478261b2f92678";
WebRequest request = WebRequest.Create(url);

3. 创建WebResponse对象接受响应

WebResponse response = request.GetResponse();

4. 创建流对象读取数据并转换成字符串

Stream webstream = response.GetResponseStream();
StreamReader streamReader = new StreamReader(webstream);
string json = streamReader.ReadToEnd();  

5. 输出看看

对json数据进行解析

1. 添加引用

2. 引用命名空间

using System.Web.Script.Serialization;

3. 构造对应json格式的类（可以用网站http://json2csharp.chahuo.com/）

//存储天气json格式的类
        public class Lives
        {
            public string province { get; set; }
            public string city { get; set; }
            public string adcode { get; set; }
            public string weather { get; set; }
            public string temperature { get; set; }
            public string winddirection { get; set; }
            public string windpower { get; set; }
            public string humidity { get; set; }
            public string reporttime { get; set; }
        }

        public class RootObject
        {
            public string status { get; set; }
            public string count { get; set; }
            public string info { get; set; }
            public string infocode { get; set; }
            public List<Lives> lives { get; set; }

        }

4. 反序列化，将指定的 JSON 字符串转换为 RootObject类型的对象。

JavaScriptSerializer js = new JavaScriptSerializer();//实例化一个能够序列化数据的类
RootObject rootObject = js.Deserialize<RootObject>(json);  //反序列化
string province = rootObject.lives[0].province;
string city = rootObject.lives[0].city;
string weather = rootObject.lives[0].weather;
string msg = String.Format("{0}-{1}的天气是:{2}", province, city, weather);

5. 输出看看

全部代码

using System.Net;
using System.IO;
using System.Web.Script.Serialization;



 //存储天气json格式的类
 public class Lives
 {
     public string province { get; set; }
     public string city { get; set; }
     public string adcode { get; set; }
     public string weather { get; set; }
     public string temperature { get; set; }
     public string winddirection { get; set; }
     public string windpower { get; set; }
     public string humidity { get; set; }
     public string reporttime { get; set; }
 }

public class RootObject
{
    public string status { get; set; }
    public string count { get; set; }
    public string info { get; set; }
    public string infocode { get; set; }
    public List<Lives> lives { get; set; }

}


private void 天气ToolStripMenuItem_Click(object sender, EventArgs e)
{
    string url = "https://restapi.amap.com/v3/weather/weatherInfo?city=110101&key=84567e9a80aaa95b24478261b2f92678";
    WebRequest request = WebRequest.Create(url);  //创建连接
    WebResponse response = request.GetResponse();
    Stream webstream = response.GetResponseStream();
    StreamReader streamReader = new StreamReader(webstream);

    string json = streamReader.ReadToEnd();  //获取json数据
    JavaScriptSerializer js = new JavaScriptSerializer();//实例化一个能够序列化数据的类
    RootObject rootObject = js.Deserialize<RootObject>(json);  //反序列化
    string province = rootObject.lives[0].province;
    string city = rootObject.lives[0].city;
    string weather = rootObject.lives[0].weather;
    string msg = String.Format("{0}-{1}的天气是:{2}", province, city, weather);
    MessageBox.Show(msg);

}