C# 主动发起请求代码

本文用于写代码是给提示

private string GetHW(string uri)
{
    string returnStr = "";
    HttpWebRequest hwRequest = (HttpWebRequest)System.Net.WebRequest.Create(uri);
    hwRequest.Method = "GET";
    HttpWebResponse hwRespone = (HttpWebResponse)hwRequest.GetResponse();
    if (hwRespone != null && hwRespone.StatusCode == HttpStatusCode.OK)
    {
        //流的处理有必要还有进行解压缩之类的
        using (StreamReader sr = new StreamReader(hwRespone.GetResponseStream(), Encoding.UTF8))
        {
            returnStr = sr.ReadToEnd();
        }
    }
    return returnStr;
}

private string PostHW(string uri, string postString)
{
    string returnStr = "";
    HttpWebRequest hwRequest = (HttpWebRequest)System.Net.WebRequest.Create(uri);
    hwRequest.Method = "Post";
    hwRequest.ContentType = "application/x-www-form-urlencoded";  //设置ContntType ，这句很重要，否则无法传递参数

    byte[] postData = Encoding.UTF8.GetBytes(postString);//postData即为发送的数据
    hwRequest.ContentLength = postData.Length;//设置客户端发送的内容长度

    Stream requestStream = hwRequest.GetRequestStream();//获取请求流
    requestStream.Write(postData, 0, postData.Length);//把参数写入流
    requestStream.Close();//关闭请求流

    HttpWebResponse hwRespone = (HttpWebResponse)hwRequest.GetResponse();
    Stream responseStream = hwRespone.GetResponseStream();//得到回应流

    if (hwRespone != null && hwRespone.StatusCode == HttpStatusCode.OK)
    {
        using (StreamReader sr = new StreamReader(hwRespone.GetResponseStream(), Encoding.UTF8))
        {
            returnStr = sr.ReadToEnd();
        }
    }
    responseStream.Close();//关闭回应流
    return returnStr;
}

private string GetWebClient(string uri)
{
    string returnStr = "";
    WebClient wCient = new System.Net.WebClient();
    wCient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
    using (StreamReader sr = new StreamReader(wCient.OpenRead(uri), Encoding.UTF8))
    {
        returnStr = sr.ReadToEnd();
    }
    return returnStr;
}
public string GetWebClient2(string uri)
{
    uri = @"";
    string returnStr = "";
    WebClient wCient = new System.Net.WebClient();
    wCient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
    byte[] responseData = wCient.DownloadData(uri);
    //using (StreamReader sr = new StreamReader(wCient.OpenRead(uri), Encoding.UTF8))
    //{
    //    returnStr = sr.ReadToEnd();
    //}
    returnStr = Encoding.UTF8.GetString(responseData);//返回接受的数据 
    return returnStr;
}

private string PostWebClient(string uri, string postString)
{
    string returnStr = "";
    //string postString = "userName=123&city=101";//设置参数，POST参数的格式是  参数1=值1&参数2=值2&参数3=值3 //PostString = "blog_title=博客标题&";PostString += "blog_body=博客内容&";PostString += "blog_class=1";//将参数字符串转换成字节数组。

    WebClient wCient = new System.Net.WebClient();
    wCient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
    byte[] postData = Encoding.ASCII.GetBytes(postString);
    byte[] responseData = wCient.UploadData(uri, "POST", postData);//得到返回字符流  
    returnStr = Encoding.UTF8.GetString(responseData);//返回接受的数据 
    return returnStr;
}