我尝试使用Microsoft.Http来调用一个API。我按照这里提供的示例http://www.asp.net/web-api/overview/advanced/calling-a-web-api-from-a-net-client,但我的任务没有完成,仍处于等待激活状态。
登录按钮:
private void btnLogin_Click(object sender, EventArgs e) {
try {
var t = Api.LoginAsync( tbUsername.Text, tbPassword.Text);
t.Wait();
_Token = t.Result;
}
catch (Exception ex) {
ShowError(ex.Message);
}
}
API类
static class Api {
private const string URLBase = "http://localhost:28929/";
public static async Task<string> LoginAsync(string Username, string Password ) {
using (var client = new HttpClient()) {
client.BaseAddress = new Uri(URLBase);
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
// HTTP POST
var VM = new Usuario() { Username = Username, Password = Password};
HttpResponseMessage response = await client.PostAsJsonAsync("api/login", VM);
if (response.IsSuccessStatusCode) {
return await response.Content.ReadAsAsync<string>();
}
else {
throw new ApplicationException("No se pudo ingresar. Error: " + response.StatusCode.ToString());
}
}
}
}
Wait
或检查任务的Result
属性可能会导致死锁。 - Daniel Mann_Token = await Api.LoginAsync(tbUsername.Text, tbPassword.Text);
。 - Eduardo Molteni