跨域调用接口——WebClient通过get和post请求api

AJAX不可以实现跨域请求，经过特殊处理才行。一般后台可以通过WebClient实现跨域请求~

//get 请求
        string url = string.Format("http://localhost:28450/api/values?str1=a&str2=b");
        WebClient wc = new WebClient();
        Encoding enc = Encoding.GetEncoding("UTF-8");
        Byte[] pageData = wc.DownloadData(url);DownloadString(url);
        string re = enc.GetString(pageData);

//post 请求(注意Post请求都是传递Json过去)

        Person p=new Person(){Name="张三",Age=22};
        string postData = Convert.Serialize(p);
        byte[] bytes = Encoding.UTF8.GetBytes(postData);
        WebClient client = new WebClient();
        client.Headers.Add("Content-Type", "application/json");
        client.Headers.Add("ContentLength", postData.Length.ToString());
        Encoding enc = Encoding.GetEncoding("UTF-8");
        byte[] responseData = client.UploadData("http://localhost:28450/api/values", "POST", bytes);
        string re = enc.GetString(responseData);

//调用接口Demo

string url = "http://localhost:62691/SessionState/TransmitSession";//获取会话同步接口
           
            //调用接口进行同步
            string timeStamp = GetTimeStamp();//获取时间戳
            string sign = DESEncrypt.Encrypt(timeStamp, "dxqmp52c0esxymru");
            Person p=new Person(){Name="张三"，Age=22,Gender="男"};
            string postData =p;
            byte[] bytes = Encoding.UTF8.GetBytes(postData);
            WebClient client = new WebClient();
            client.Headers.Add("Content-Type", "application/json");
            client.Headers.Add("ContentLength", postData.Length.ToString());
            Encoding enc = Encoding.GetEncoding("UTF-8");
            byte[] responseData = client.UploadData(url, "POST", bytes);           
            string re = enc.GetString(responseData);

来源：http://blog.csdn.net/zhaoqi5705/article/details/14920667