.Net Code 5.x 学习

1.请求错误Unsupported Media Type
需要在参数添加标记[FromForm]

[HttpPost]
public async Task<ActionResult<User>> PostUser([FromForm] User user)
{
_context.Users.Add(user);
await _context.SaveChangesAsync();
return CreatedAtAction("GetUser", new { id = user.Id }, user);
}

HttpClient

HttpContent常用基类StringContent、JsonContent

private readonly HttpClient http = new HttpClient();
var result = await http.GetStringAsync("http://192.168.1.14:8088/WeatherForecast");
var res= await http.PostAsync("http://localhost:34701/api/UserCharacters", content);
string r=await res.Content.ReadAsStringAsync();
var content = new StringContent("{"id":0,"name":"8191","userId":0,"characterTypeId":0,"sex":0,"enable":0}"
, Encoding.UTF8, "application/json");

跨域

ConfigureServices里面加入

services.AddCors(options =>
{
options.AddPolicy("any", builder =>
{
builder.AllowAnyOrigin() //允许任何来源的主机访问
.AllowAnyMethod()
.AllowAnyHeader();
});
});

Configure里面加入

app.UseCors("any");

最后

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