本文章是在VS2017的环境下，.net core 1.1版本以上。
在这时期，因为.net core 并不基于IIS，我们的过去的收集要求代码在.net core框架下，有可能会涌现不兼容，报错的征象。这里大抵引见下在.net core 下怎样举行http要求，重要仍然是GET和POST要领，有毛病的处所，迎接斧正！
先来讲POST,POST我完成了三种要领，前两种基于的道理是完全一致的，背面的有些小小的差别，但他们的实质都是http要求，实质上是无区分的，只是完成要领有所不同。
空话不多说，上代码：
POST异步要领：
/// <summary>
/// 异步要求post（键值对情势,可守候的）
/// </summary>
/// <param name="uri">收集基址("http://localhost:59315")</param>
/// <param name="url">收集的地点("/api/UMeng")</param>
/// <param name="formData">键值对List<KeyValuePair<string, string>> formData = new List<KeyValuePair<string, string>>();formData.Add(new KeyValuePair<string, string>("userid", "29122"));formData.Add(new KeyValuePair<string, string>("umengids", "29122"));</param>
/// <param name="charset">编码花样</param>
/// <param name="mediaType">头媒体范例</param>
/// <returns></returns>
public async Task<string> HttpPostAsync(string uri, string url, List<KeyValuePair<string, string>> formData = null, string charset = "UTF-8", string mediaType = "application/x-www-form-urlencoded")
{
string tokenUri = url;
var client = new HttpClient();
client.BaseAddress = new Uri(uri);
HttpContent content = new FormUrlEncodedContent(formData);
content.Headers.ContentType = new MediaTypeHeaderValue(mediaType);
content.Headers.ContentType.CharSet = charset;
for (int i = 0; i < formData.Count; i++)
{
content.Headers.Add(formData[i].Key, formData[i].Value);
}
HttpResponseMessage resp = await client.PostAsync(tokenUri, content);
resp.EnsureSuccessStatusCode();
string token = await resp.Content.ReadAsStringAsync();
return token;
}
POST同步要领：
/// <summary>
/// 同步要求post（键值对情势）
/// </summary>
/// <param name="uri">收集基址("http://localhost:59315")</param>
/// <param name="url">收集的地点("/api/UMeng")</param>
/// <param name="formData">键值对List<KeyValuePair<string, string>> formData = new List<KeyValuePair<string, string>>();formData.Add(new KeyValuePair<string, string>("userid", "29122"));formData.Add(new KeyValuePair<string, string>("umengids", "29122"));</param>
/// <param name="charset">编码花样</param>
/// <param name="mediaType">头媒体范例</param>
/// <returns></returns>
public string HttpPost(string uri, string url, List<KeyValuePair<string, string>> formData = null, string charset = "UTF-8", string mediaType = "application/x-www-form-urlencoded")
{
string tokenUri = url;
var client = new HttpClient();
client.BaseAddress = new Uri(uri);
HttpContent content = new FormUrlEncodedContent(formData);
content.Headers.ContentType = new MediaTypeHeaderValue(mediaType);
content.Headers.ContentType.CharSet = charset;
for (int i = 0; i < formData.Count; i++)
{
content.Headers.Add(formData[i].Key, formData[i].Value);
}
var res = client.PostAsync(tokenUri, content);
res.Wait();
HttpResponseMessage resp = res.Result;
var res2 = resp.Content.ReadAsStringAsync();
res2.Wait();
string token = res2.Result;
return token;
}
遗憾的是，同步要领也是基于异步完成的，个人认为如许做会加大体系开支。假如列位有其他的高效完成，请不吝赐教！
接下来是经由过程流的体式格局举行POST：
public string Post(string url, string data, Encoding encoding, int type)
{
try
{
HttpWebRequest req = WebRequest.CreateHttp(new Uri(url));
if (type == 1)
{
req.ContentType = "application/json;charset=utf-8";
}
else if (type == 2)
{
req.ContentType = "application/xml;charset=utf-8";
}
else
{
req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";
}
req.Method = "POST";
//req.Accept = "text/xml,text/javascript";
req.ContinueTimeout = 60000;
byte[] postData = encoding.GetBytes(data);
Stream reqStream = req.GetRequestStreamAsync().Result;
reqStream.Write(postData, 0, postData.Length);
reqStream.Dispose();
var rsp = (HttpWebResponse)req.GetResponseAsync().Result;
var result = GetResponseAsString(rsp, encoding);
return result;
}
catch (Exception ex)
{
throw;
}
}
private string GetResponseAsString(HttpWebResponse rsp, Encoding encoding)
{
Stream stream = null;
StreamReader reader = null;
try
{
// 以字符流的体式格局读取HTTP相应
stream = rsp.GetResponseStream();
reader = new StreamReader(stream, encoding);
return reader.ReadToEnd();
}
finally
{
// 开释资本
if (reader != null) reader.Dispose();
if (stream != null) stream.Dispose();
if (rsp != null) rsp.Dispose();
}
}
这类体式格局的POST照样将数据写入到流内里，举行POST,之所以写前两个key-value的情势，是为了相符java或许oc的作风，在c#誊写的webapi中，因为吸收情势是{=value}而不是{key=value}(由webapi的性子决议)，后续我会说怎样在webapi中吸收（key-value）的情势，恰当防止.net背景职员与android和ios的抵牾，从而到达社会主义民主社会的长治久安。
接下来是get，一样同步异步都是由异步完成的，还请列位看官轻喷。
GET：
/// <summary>
/// 异步要求get(UTF-8)
/// </summary>
/// <param name="url">链接地点</param>
/// <param name="formData">写在header中的内容</param>
/// <returns></returns>
public static async Task<string> HttpGetAsync(string url, List<KeyValuePair<string, string>> formData = null)
{
HttpClient httpClient = new HttpClient();
HttpContent content = new FormUrlEncodedContent(formData);
if (formData != null)
{
content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
content.Headers.ContentType.CharSet = "UTF-8";
for (int i = 0; i < formData.Count; i++)
{
content.Headers.Add(formData[i].Key, formData[i].Value);
}
}
var request = new HttpRequestMessage()
{
RequestUri = new Uri(url),
Method = HttpMethod.Get,
};
for (int i = 0; i < formData.Count; i++)
{
request.Headers.Add(formData[i].Key, formData[i].Value);
}
var resp = await httpClient.SendAsync(request);
resp.EnsureSuccessStatusCode();
string token = await resp.Content.ReadAsStringAsync();
return token;
}
/// <summary>
/// 同步get要求
/// </summary>
/// <param name="url">链接地点</param>
/// <param name="formData">写在header中的键值对</param>
/// <returns></returns>
public string HttpGet(string url, List<KeyValuePair<string, string>> formData = null)
{
HttpClient httpClient = new HttpClient();
HttpContent content = new FormUrlEncodedContent(formData);
if (formData != null)
{
content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
content.Headers.ContentType.CharSet = "UTF-8";
for (int i = 0; i < formData.Count; i++)
{
content.Headers.Add(formData[i].Key, formData[i].Value);
}
}
var request = new HttpRequestMessage()
{
RequestUri = new Uri(url),
Method = HttpMethod.Get,
};
for (int i = 0; i < formData.Count; i++)
{
request.Headers.Add(formData[i].Key, formData[i].Value);
}
var res = httpClient.SendAsync(request);
res.Wait();
var resp = res.Result;
Task<string> temp = resp.Content.ReadAsStringAsync();
temp.Wait();
return temp.Result;
}
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