.net MVC APi调用

public string Get(int id)
{
    return "value";
}

public string Post([FromBody]test t)
{
    return t.aa;
}

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri(WebCall.serverurl);
    test t = new test();
    t.aa = "a";
    t.bb = "b";
    var requestJson = AppUtils.JsonSerializer<test>(t);
    HttpContent httpContent = new StringContent(requestJson);
    httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
    var result = client.PostAsync("Values", httpContent).Result.Content.ReadAsStringAsync().Result;
    MessageBox.Show(result);
}