我創(chuàng)建了一個(gè) api 來(lái)獲取數(shù)據(jù)，但它顯示超時(shí)錯(cuò)誤。我正在調(diào)用運(yùn)行應(yīng)用程序時(shí)調(diào)用的 Xamarin 主函數(shù)內(nèi)部的函數(shù)。public MainPage() { InitializeComponent(); //this.BindingContext = new PatientViewModel(); Task<PatientModel> abc = GetPatientData(); }我的 api GetAsync 調(diào)用函數(shù)：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(méi)有顯示任何錯(cuò)誤。當(dāng)執(zhí)行到 GetAsync 語(yǔ)句時(shí)，它會(huì)等待一段時(shí)間并發(fā)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(xiàn)1860條經(jīng)驗(yàn) 獲得超9個(gè)贊
考慮使用異步事件處理程序和靜態(tài)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(diào)用和套接字耗盡，這有時(shí)會(huì)導(dǎo)致死鎖，從而導(dǎo)致超時(shí)。
POPMUISE
TA貢獻(xiàn)1765條經(jīng)驗(yàn) 獲得超5個(gè)贊
嘗試這個(gè)。
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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