Fix async (#10218)

* Fix async

* Fix async for statistics

* Try fix pac async

* Fix

v2rayN/ServiceLib/Helper/HttpClientHelper.cs

@@ -22,7 +22,7 @@ public class HttpClientHelper
         this.httpClient = httpClient;
     }
 
-    public async Task<string?> TryGetAsync(string url)
+    public async Task<string?> TryGetAsync(string url, CancellationToken cancellationToken = default)
     {
         if (url.IsNullOrEmpty())
         {
@@ -31,8 +31,12 @@ public class HttpClientHelper
 
         try
         {
-            var response = await httpClient.GetAsync(url);
-            return await response.Content.ReadAsStringAsync();
+            var response = await httpClient.GetAsync(url, cancellationToken);
+            return await response.Content.ReadAsStringAsync(cancellationToken);
+        }
+        catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)
+        {
+            throw;
         }
         catch
         {

v2rayN/ServiceLib/Helper/SqliteHelper.cs

@@ -75,15 +75,28 @@ public sealed class SQLiteHelper
 
     public async Task DisposeDbConnectionAsync()
     {
-        await Task.Factory.StartNew(() =>
+        await Task.Run(() =>
         {
-            _db?.Close();
-            _db?.Dispose();
-            _db = null;
+            try
+            {
+                _db?.Close();
+                _db?.Dispose();
+            }
+            finally
+            {
+                _db = null;
+            }
 
-            _dbAsync?.GetConnection()?.Close();
-            _dbAsync?.GetConnection()?.Dispose();
-            _dbAsync = null;
+            try
+            {
+                var conn = _dbAsync?.GetConnection();
+                conn?.Close();
+                conn?.Dispose();
+            }
+            finally
+            {
+                _dbAsync = null;
+            }
         });
     }
 }