Get与Post请求

Get请求：

        /// <summary>
        /// get请求
        /// </summary>
        /// <param name="uri">地址</param>
        /// <param name="paramStr">参数</param>
        /// <param name="token">令牌</param>
        /// <returns></returns>
        public static string WebClientRequestGet(string uri, string paramStr, string token = null)
        {
            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(uri + paramStr); ;//创建请求
            request.Method = "Get";//设置访问方式
            request.ContentType = "application/json";
            if (token != null)
            {
                request.Headers.Add("Authorization", "Bearer " + token);
            }
            try
            {
                System.Net.HttpWebResponse result = request.GetResponse() as System.Net.HttpWebResponse;
                System.IO.StreamReader sr = new System.IO.StreamReader(result.GetResponseStream(), Encoding.UTF8);
                string strResult = sr.ReadToEnd();
                sr.Close();
                return strResult;
            }
            catch (Exception e)
            {
                //记录日志e.Message
                //throw new Exception(e.Message);
                return null;
            }
        }

Post请求：

        /// <summary>
        /// Post请求
        /// </summary>
        /// <param name="uri">地址</param>
        /// <param name="paramStr">参数</param>
        /// <param name="encoding">编码</param>
        /// <param name="token">令牌</param>
        /// <returns></returns>
        public static string WebClientRequestPost(string uri, string paramStr, Encoding encoding, string token = null)
        {
            if (encoding == null)
                encoding = Encoding.UTF8;
            System.Net.WebClient wc = new System.Net.WebClient(); //WebClient wc = new WebClientto(600000);//设置600s超时时间
            // 采取POST方式必须加的Header
            wc.Headers.Add("Content-Type", "application/json");
            if (token != null)
            {
                wc.Headers.Add("Authorization", "Bearer " + token);
            }
            byte[] postData = encoding.GetBytes(paramStr);
            byte[] responseData = null;
            try
            {
                responseData = wc.UploadData(uri, "POST", postData); // 得到返回字符流
                return encoding.GetString(responseData);// 解码    
            }
            catch (Exception e)
            {
                //记录日志e.Message
                //throw new Exception(e.Message);
                return null;
            }
        }

以上token都是在Header里的，还有token直接在链接后面的。其中System.Net.Webclient在下载请求时无法设置请求超时时间和请求读写超时时间。WebClient在异步下载时遇到网络不通等问题时没有响应超时造成app挂起,会造成请求超时。

解决方法：

1.写一个类继承Webclient，并且重写GetWebRequest,添加WebRequest对象超时时间 。

public class WebClientto : WebClient
{
    /// <summary>  
    /// 过期时间  
    /// </summary>  
    public int Timeout { get; set; }

    public WebClientto(int timeout)
    {
        Timeout = timeout;
    }

    /// <summary>  
    /// 重写GetWebRequest,添加WebRequest对象超时时间  
    /// </summary>  
    /// <param name="address"></param>  
    /// <returns></returns>  
    protected override WebRequest GetWebRequest(Uri address)
    {
        HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address);
        request.Timeout = Timeout;
        request.ReadWriteTimeout = Timeout;
        return request;
    }
} 

2、直接使用HttpWebRequest

/// <summary>
/// Post请求
/// </summary>
/// <param name="uri">地址</param>
/// <param name="paramStr">参数</param>
/// <returns></returns>
public string RequestPost(string uri, string paramStr)
{
    string strResult = string.Empty;
    try
    {
        System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(uri); ;//创建请求  
        request.Timeout = 600000;   //请求超时前等待的毫秒数。默认值是 100,000 毫秒（100 秒）
        request.ReadWriteTimeout = 600000; //获取或设置写入或读取流时的超时
        request.Method = "POST";//设置访问方式  
        request.ContentType = "application/json";
        #region 添加post参数
        byte[] data = Encoding.UTF8.GetBytes(paramStr);
        request.ContentLength = data.Length;
        using (System.IO.Stream reqStream = request.GetRequestStream())
        {
            reqStream.Write(data, 0, data.Length);
            reqStream.Close();
        }
        #endregion
        System.Net.HttpWebResponse result = request.GetResponse() as System.Net.HttpWebResponse;
        //获取响应内容
        using (System.IO.StreamReader sr = new System.IO.StreamReader(result.GetResponseStream(), Encoding.UTF8))
        {
            strResult = sr.ReadToEnd();
            sr.Close();
            return strResult;
        }
    }
    catch (Exception ex) { throw new Exception(ex.Message); }
    finally { strResult = string.Empty; }
}