标签：default 注意 img media [] type code serialize def
【一】步骤：
1）将对象转化为Json字符串。
2）将Json字符串编码为byte数组。
3）设置传输对象（WebRequest或者HttpClient）的ContentType是"application/json"。
4）设置传输对象的ContentLength=Byte数组的长度。
5）开始传输
6）获取JSON结果：
【二】示例代码：
【对于WebRequest而言】
static void SendByWebRequesttoApi()
{
WebRequest req = WebRequest.Create("http://localhost:15203/api/ApiDefault");
var stu = new Student { ID = 1, Name = "董玮" };
string jsonString = JsonConvert.SerializeObject(stu);
byte[] objectContent = Encoding.UTF8.GetBytes(jsonString);
req.ContentLength = objectContent.Length;
req.ContentType = "application/json";
req.Method = "POST";
using (var stream = req.GetRequestStream())
{
stream.Write(objectContent, 0, objectContent.Length);
stream.Close();
}
var resp = req.GetResponse();
using (StreamReader sr = new StreamReader(resp.GetResponseStream()))
{
string s = sr.ReadToEnd();
System.Console.WriteLine(s);
}
}
【对于HttpClient而言】
static void SendByHttpClienttoApi()
{
var stu = new { ID = 1, Name = "董玮" };
using (var client = new HttpClient())
{
string jsonString = JsonConvert.SerializeObject(stu);
byte[] bytes = Encoding.UTF8.GetBytes(jsonString);
using (StreamContent sc = new StreamContent(new MemoryStream(bytes)))
{
sc.Headers.ContentLength = bytes.Length;
sc.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
var result = client.PostAsync("http://localhost:15203/api/ApiDefault", sc).Result;
var objectResult = JsonConvert.DeserializeObject<Student>(result.Content.ReadAsStringAsync().Result);
}
}
}
另外注意，以上是针对WebApi（WebApi默认是JSON格式数据传输）。如果是MVC的模式，那么默认是表单形式传输。因此：
static void SendByWebRequesttoMVC()
{
WebRequest req = WebRequest.Create("http://localhost:15203/Default/DoGetStudent");
var htmlFormPost = "ID=1&Name=董玮";
byte[] objectContent = Encoding.UTF8.GetBytes(htmlFormPost);
req.ContentLength = objectContent.Length;
req.ContentType = "application/x-www-form-urlencoded"; //必须写！
req.Method = "POST";
using (var stream = req.GetRequestStream())
{
stream.Write(objectContent, 0, objectContent.Length);
stream.Close();
}
var resp = req.GetResponse();
using (StreamReader sr = new StreamReader(resp.GetResponseStream()))
{
string s = sr.ReadToEnd();
System.Console.WriteLine(s);
}
}
在HttpClient中，把StreamContent改为FormUrlEncodedContent，传入一个Dictionary<string,string>对象即可：
static void SendByHttpClienttoMVC()
{
using (var client = new HttpClient())
{
FormUrlEncodedContent fc = new FormUrlEncodedContent(new Dictionary<string, string>() { { "ID", "1" }, { "Name", "董玮" } });
var result = client.PostAsync("http://localhost:15203/Default/DoGetStudent", fc).Result;
System.Console.WriteLine(result.Content.ReadAsStringAsync().Result);
}
}
使用HttpClient和WebRequest时POST一个对象的写法
标签：default 注意 img media [] type code serialize def
原文地址：https://www.cnblogs.com/coce/p/9721034.html
