Asp.net core uses HttpClient to implement synchronous asynchronous Post and Get methods. corehttpclient

Asp.net core uses HttpClient to implement synchronous asynchronous Post and Get methods. corehttpclient

Preparations

1. visual studio 2015 update3 Development Environment

2. net core 1.0.1 and later versions

Directory

1. HttpGet Method

2. HttpPost Method

3. Example

4. Download Code

1 HttpGet

 

/// <Summary> /// use the Get method to obtain the string result (no Cookie is added) /// </summary> /// <param name = "url"> </param> /// <returns> </returns> public static async Task <string> HttpGetAsync (string url, encoding encoding = null) {HttpClient httpClient = new HttpClient (); var data = await httpClient. getByteArrayAsync (url); var ret = encoding. getString (data); return ret ;} /// <summary> /// Http Get synchronization method /// </summary> /// <param name = "url"> </param> /// <param name = "encoding"> </param> // <returns> </returns> public static string HttpGet (string url, encoding encoding = null) {HttpClient httpClient = new HttpClient (); var t = httpClient. getByteArrayAsync (url); t. wait (); var ret = encoding. getString (t. result); return ret ;}

　　

2 HttpPost Method

/// <Summary> /// POST asynchronous // </summary> /// <param name = "url"> </param> /// <param name = "postStream"> </param> // <param name = "encoding"> </param> // <param name = "timeOut"> </param> // /<returns> </returns> public static async Task <string> HttpPostAsync (string url, dictionary <string, string> formData = null, Encoding encoding = null, int timeOut = 10000) {HttpClientHandler handler = new HttpClientH Andler (); HttpClient client = new HttpClient (handler); MemoryStream MS = new MemoryStream (); formData. fillFormDataStream (MS); // fill formData HttpContent hc = new StreamContent (MS); client. defaultRequestHeaders. accept. add (new MediaTypeWithQualityHeaderValue ("text/html"); client. defaultRequestHeaders. accept. add (new MediaTypeWithQualityHeaderValue ("application/xhtml + xml"); client. defaultRequestHeaders. Accept. add (new MediaTypeWithQualityHeaderValue ("application/xml", 0.9); client. defaultRequestHeaders. accept. add (new MediaTypeWithQualityHeaderValue ("image/webp"); client. defaultRequestHeaders. accept. add (new MediaTypeWithQualityHeaderValue ("*/*", 0.8); hc. headers. add ("UserAgent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36"); hc. Headers. add ("Timeout", timeOut. toString (); hc. headers. add ("KeepAlive", "true"); var r = await client. postAsync (url, hc); byte [] tmp = await r. content. readAsByteArrayAsync (); return encoding. getString (tmp );} /// <summary> /// POST synchronization // </summary> /// <param name = "url"> </param> /// <param name = "postStream"> </param> // <param name = "encoding"> </param> // <param name = "timeOut"> </param> // /<retur Ns> </returns> public static string HttpPost (string url, Dictionary <string, string> formData = null, Encoding encoding = null, int timeOut = 10000) {HttpClientHandler handler = new HttpClientHandler (); HttpClient client = new HttpClient (handler); MemoryStream MS = new MemoryStream (); formData. fillFormDataStream (MS); // fill formData HttpContent hc = new StreamContent (MS); client. defaultRequestHeaders. A Ccept. add (new MediaTypeWithQualityHeaderValue ("text/html"); client. defaultRequestHeaders. accept. add (new MediaTypeWithQualityHeaderValue ("application/xhtml + xml"); client. defaultRequestHeaders. accept. add (new MediaTypeWithQualityHeaderValue ("application/xml", 0.9); client. defaultRequestHeaders. accept. add (new MediaTypeWithQualityHeaderValue ("image/webp"); client. defaultRequestHeaders. accept. add (ne W MediaTypeWithQualityHeaderValue ("*/*", 0.8); hc. headers. add ("UserAgent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36"); hc. headers. add ("Timeout", timeOut. toString (); hc. headers. add ("KeepAlive", "true"); var t = client. postAsync (url, hc); t. wait (); var t2 = t. result. content. readAsByteArrayAsync (); return encoding. getString (t2.Res Ult) ;}/// <summary> /// the method used to assemble QueryString is connected with &, and there is no symbol in the first place, for example: a = 1 & B = 2 & c = 3 // </summary> /// <param name = "formData"> </param> /// <returns> </returns> public static string GetQueryString (this Dictionary <string, string> formData) {if (formData = null | formData. count = 0) {return "";} StringBuilder sb = new StringBuilder (); var I = 0; foreach (var kv in formData) {I ++; sb. appendFormat ("{0} = {1} ", kv. key, kv. value); if (I <formData. count) {sb. append ("&") ;}} return sb. toString ();} /// <summary> /// Stream that fills the form information /// </summary> /// <param name = "formData"> </param> // <param name = "stream"> </param> public static void FillFormDataStream (this Dictionary <string, string> formData, Stream stream) {string dataString = GetQueryString (formData); var formDataBytes = formData = null? New byte [0]: Encoding. UTF8.GetBytes (dataString); stream. write (formDataBytes, 0, formDataBytes. length); stream. seek (0, SeekOrigin. begin); // set the pointer reading position}

　　

 

3 Examples

Modify the index. cshtml file under View

@{    ViewData["Title"] = "Home Page";    Layout = null;} @{   @*var ret1=await httpclientdemo.HttpHelper.HttpGetAsync("http://www.baidu.com", System.Text.Encoding.GetEncoding("utf-8"));    @Html.Raw(ret1)*@    @*var ret2 = httpclientdemo.HttpHelper.HttpGet("http://www.baidu.com", System.Text.Encoding.GetEncoding("utf-8"));    @Html.Raw(ret2)*@    var ret3 = httpclientdemo.HttpHelper.HttpPost("http://www.baidu.com",null, System.Text.Encoding.GetEncoding("utf-8"));    @Html.Raw(ret3)    @*var ret4 = await httpclientdemo.HttpHelper.HttpPostAsync("http://www.baidu.com", null, System.Text.Encoding.GetEncoding("utf-8"),10000);    @Html.Raw(ret4)*@}

　

4. Download Code

Link: http://pan.baidu.com/s/1gfdqwDX password: dxzp