C#中GET、POST请求API

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/// <summary>
/// 提交数据请求 post
/// </summary>
/// <param name="POSTURL">请求提交的地址如：http://xxx.xxx.xxx/interface/TestPostRequest</param>
/// <param name="PostData">提交的数据(字符串)</param>
/// <returns></returns>
public static string RequestData(string POSTURL, string PostData)
{
//发送请求的数据
WebRequest myHttpWebRequest = WebRequest.Create(POSTURL);
myHttpWebRequest.Method = "POST";
UTF8Encoding encoding = new UTF8Encoding();
byte[] byte1 = encoding.GetBytes(PostData);
myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
myHttpWebRequest.ContentLength = byte1.Length;
Stream newStream = myHttpWebRequest.GetRequestStream();
newStream.Write(byte1, 0, byte1.Length);
newStream.Close();

//发送成功后接收返回的XML信息
HttpWebResponse response = (HttpWebResponse)myHttpWebRequest.GetResponse();
string lcHtml = string.Empty;
Encoding enc = Encoding.GetEncoding("UTF-8");
Stream stream = response.GetResponseStream();
StreamReader streamReader = new StreamReader(stream, enc);
lcHtml = streamReader.ReadToEnd();
return lcHtml;
}

/// <summary>
/// GET请求与获取结果
/// </summary>
public static string HttpGet(string Url, string postDataStr)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr);
request.Method = "GET";
request.ContentType = "text/html;charset=UTF-8";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream myResponseStream = response.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}

WebClient请求方式

/// <summary>
/// Get请求方式
/// </summary>
/// <param name="url">get请求url</param>
/// <returns></returns>
public string GetJson(string url)
{
WebClient wc = new WebClient();
wc.Credentials = CredentialCache.DefaultCredentials;
wc.Encoding = Encoding.UTF8;
string returnText = wc.DownloadString(url);
if (returnText.Contains("errcode"))
{
//可能发生错误
}
return returnText;

}

//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);
        string re = enc.GetString(pageData);

//post 请求
        string postData = "value=a";
        byte[] bytes = Encoding.UTF8.GetBytes(postData);
        WebClient client = new WebClient();
        client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
        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);

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