Use TaskCache class from Microsoft.Extensions.TaskCache.Sources (#955)

Instead of Task.FromResult(0)

src/Microsoft.AspNetCore.Identity.EntityFrameworkCore/RoleStore.cs

@@ -9,6 +9,7 @@ using System.Security.Claims;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Internal;
 
 namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
 {
@@ -263,7 +264,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(role));
             }
             role.Name = roleName;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -354,7 +355,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(role));
             }
             role.NormalizedName = normalizedName;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>

src/Microsoft.AspNetCore.Identity.EntityFrameworkCore/UserStore.cs

@@ -10,6 +10,7 @@ using System.Security.Claims;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Internal;
 
 namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
 {
@@ -291,7 +292,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
         /// <returns>The <see cref="Task"/> that represents the asynchronous operation.</returns>
         protected Task SaveChanges(CancellationToken cancellationToken)
         {
-            return AutoSaveChanges ? Context.SaveChangesAsync(cancellationToken) : Task.FromResult(0);
+            return AutoSaveChanges ? Context.SaveChangesAsync(cancellationToken) : TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -344,7 +345,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.UserName = userName;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -380,7 +381,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.NormalizedUserName = normalizedName;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -541,7 +542,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.PasswordHash = passwordHash;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -933,7 +934,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.EmailConfirmed = confirmed;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -952,7 +953,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.Email = email;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -1007,7 +1008,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.NormalizedEmail = normalizedEmail;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -1062,7 +1063,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.LockoutEnd = lockoutEnd;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -1099,7 +1100,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.AccessFailedCount = 0;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -1154,7 +1155,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.LockoutEnabled = enabled;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -1173,7 +1174,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.PhoneNumber = phoneNumber;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -1229,7 +1230,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.PhoneNumberConfirmed = confirmed;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -1248,7 +1249,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.SecurityStamp = stamp;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>
@@ -1285,7 +1286,7 @@ namespace Microsoft.AspNetCore.Identity.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(user));
             }
             user.TwoFactorEnabled = enabled;
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         /// <summary>

src/Microsoft.AspNetCore.Identity.EntityFrameworkCore/project.json

@@ -20,7 +20,11 @@
   },
   "dependencies": {
     "Microsoft.AspNetCore.Identity": "1.1.0-*",
-    "Microsoft.EntityFrameworkCore.Relational": "1.1.0-*"
+    "Microsoft.EntityFrameworkCore.Relational": "1.1.0-*",
+    "Microsoft.Extensions.TaskCache.Sources": {
+      "version": "1.1.0-*",
+      "type": "build"
+    }
   },
   "frameworks": {
     "net451": {},

src/Microsoft.AspNetCore.Identity/SignInManager.cs

@@ -11,6 +11,7 @@ using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Authentication;
 using Microsoft.AspNetCore.Http.Features.Authentication;
+using Microsoft.Extensions.Internal;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 
@@ -662,7 +663,7 @@ namespace Microsoft.AspNetCore.Identity
             {
                 return UserManager.ResetAccessFailedCountAsync(user);
             }
-            return Task.FromResult(0);
+            return TaskCache.CompletedTask;
         }
 
         internal class TwoFactorAuthenticationInfo

src/Microsoft.AspNetCore.Identity/project.json

@@ -20,7 +20,11 @@
   "dependencies": {
     "Microsoft.AspNetCore.Authentication.Cookies": "1.1.0-*",
     "Microsoft.AspNetCore.Cryptography.KeyDerivation": "1.1.0-*",
-    "Microsoft.AspNetCore.Hosting.Abstractions": "1.1.0-*"
+    "Microsoft.AspNetCore.Hosting.Abstractions": "1.1.0-*",
+    "Microsoft.Extensions.TaskCache.Sources": {
+      "version": "1.1.0-*",
+      "type": "build"
+    }
   },
   "frameworks": {
     "net451": {},