我創建了一個 api 來獲取數據，但它顯示超時錯誤。我正在調用運行應用程序時調用的 Xamarin 主函數內部的函數。public MainPage() { InitializeComponent(); //this.BindingContext = new PatientViewModel(); Task<PatientModel> abc = GetPatientData(); }我的 api GetAsync 調用函數：public async Task<PatientModel> GetPatientData() { PatientModel patient = null; try { Uri weburl = new Uri("myuri"); HttpClient client = new HttpClient(); Console.WriteLine("a"); HttpResponseMessage response = await client.GetAsync(weburl); Console.WriteLine("b"); if (response.IsSuccessStatusCode) { Console.WriteLine("in"); patient = await response.Content.ReadAsAsync<PatientModel>(); Console.WriteLine("in funciton"); return patient; } return patient; }catch(Exception ex) { Console.WriteLine(ex); return patient; } }}代碼沒有顯示任何錯誤。當執行到 GetAsync 語句時，它會等待一段時間并發生異常。System.Net.WebException: The request timed out. ---> Foundation.NSErrorException: Exception of type 'Foundation.NSErrorException' was thrown.
2 回答
慕碼人2483693
TA貢獻1860條經驗 獲得超9個贊
考慮使用異步事件處理程序和靜態HttpClient
static HttpClient client = new HttpClient();
public MainPage() {
InitializeComponent();
loadingData += onLoadingData;
}
protected override void OnAppearing() {
//loadingData -= onLoadingData; //(optional)
loadingData(this, EventArgs.Empty);
base.OnAppearing();
}
private event EventHandler loadingData = delegate { };
private async void onLoadingData(object sender, EventArgs args) {
var model = await GetPatientData();
this.BindingContext = new PatientViewModel(model);
}
public async Task<PatientModel> GetPatientData() {
PatientModel patient = null;
try {
Uri weburl = new Uri("myuri");
Console.WriteLine("a");
var response = await client.GetAsync(weburl);
Console.WriteLine("b");
if (response.IsSuccessStatusCode) {
Console.WriteLine("in");
patient = await response.Content.ReadAsAsync<PatientModel>();
Console.WriteLine("in funciton");
}
}catch(Exception ex) {
Console.WriteLine(ex);
}
return patient;
}
使用這種模式可以幫助避免阻塞調用和套接字耗盡，這有時會導致死鎖，從而導致超時。
POPMUISE
TA貢獻1765條經驗 獲得超5個贊
嘗試這個。
public PatientModel abc { get; set; }
public MainPage()
{
InitializeComponent();
Bridge();
// Using abc
}
public async void Bridge()
{
abc = new PatientModel();
abc = await GetPatientData();
}
public async Task<PatientModel> GetPatientData()
{
PatientModel patient = null;
try
{
Uri weburl = new Uri("myuri");
HttpClient client = new HttpClient();
Console.WriteLine("a");
HttpResponseMessage response = await client.GetAsync(weburl);
Console.WriteLine("b");
if (response.IsSuccessStatusCode)
{
Console.WriteLine("in");
patient = await response.Content.ReadAsAsync<PatientModel>();
Console.WriteLine("in funciton");
return patient;
}
return patient;
}catch(Exception ex)
{
Console.WriteLine(ex);
return patient;
}
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