Use cancellationtoken

framework/src/Volo.Abp.AspNetCore/Volo/Abp/AspNetCore/Threading/HttpContextCancellationTokenProvider.cs

@@ -8,7 +8,7 @@ namespace Volo.Abp.AspNetCore.Threading
     [Dependency(ReplaceServices = true)]
     public class HttpContextCancellationTokenProvider : ICancellationTokenProvider, ITransientDependency
     {
-        public CancellationToken Token => _httpContextAccessor.HttpContext?.RequestAborted ?? default;
+        public CancellationToken Token => _httpContextAccessor.HttpContext?.RequestAborted ?? CancellationToken.None;
 
         private readonly IHttpContextAccessor _httpContextAccessor;
 

framework/src/Volo.Abp.Caching/Volo/Abp/Caching/DistributedCache.cs

@@ -127,7 +127,7 @@ namespace Volo.Abp.Caching
                 return value;
             }
 
-            using (AsyncLock.Lock())
+            using (AsyncLock.Lock(CancellationTokenProvider.Token))
             {
                 value = Get(key, hideErrors);
                 if (value != null)

framework/src/Volo.Abp.Threading/Volo/Abp/Threading/NullCancellationTokenProvider.cs

@@ -6,7 +6,7 @@ namespace Volo.Abp.Threading
     {
         public static NullCancellationTokenProvider Instance { get; } = new NullCancellationTokenProvider();
 
-        public CancellationToken Token { get; } = default;
+        public CancellationToken Token { get; } = CancellationToken.None;
 
         private NullCancellationTokenProvider()
         {