private async void btnEditarUsuário_Click(object sender, RoutedEventArgs e)
{
HttpClient httpClient = new HttpClient();
httpClient.BaseAddress = new Uri(ip);
var response = await httpClient.GetAsync("/20131011110061/api/usuario");
var str = response.Content.ReadAsStringAsync().Result;
List <Models.Usuario> obj = JsonConvert.DeserializeObject <List <Models.Usuario> >(str);
Models.Usuario u = (from Models.Usuario user in obj where user.Id == usuario.Id select user).Single();
u.Nome = txtNomeUsuario.Text;
string s = JsonConvert.SerializeObject(u);
var content = new StringContent(s, Encoding.UTF8,
"application/json");
await httpClient.PutAsync("/20131011110061/api/usuario/" + usuario.Id, content);
MessageBox.Show("Acho que editou");
}