Extracted CurrentUserExtensions.

src/Volo.Abp.Session/Volo/Abp/Session/CurrentUser.cs

@@ -6,7 +6,7 @@ using Volo.Abp.Security.Claims;
 
 namespace Volo.Abp.Session
 {
-    public class CurrentUser : ICurrentUser, ITransientDependency //TODO: Singleton?
+    public class CurrentUser : ICurrentUser, ITransientDependency
     {
         public virtual bool IsAuthenticated => Id.HasValue;
 
@@ -14,7 +14,7 @@ namespace Volo.Abp.Session
         {
             get
             {
-                var value = FindClaimValue(AbpClaimTypes.UserId);
+                var value = this.FindClaimValue(AbpClaimTypes.UserId);
                 if (value == null)
                 {
                     return null;
@@ -24,9 +24,9 @@ namespace Volo.Abp.Session
             }
         }
 
-        public virtual string UserName => FindClaimValue(AbpClaimTypes.UserName);
+        public virtual string UserName => this.FindClaimValue(AbpClaimTypes.UserName);
 
-        public virtual string Email => FindClaimValue(AbpClaimTypes.Email);
+        public virtual string Email => this.FindClaimValue(AbpClaimTypes.Email);
 
         private readonly ICurrentPrincipalAccessor _principalAccessor;
 
@@ -39,22 +39,5 @@ namespace Volo.Abp.Session
         {
             return _principalAccessor.Principal?.Claims.FirstOrDefault(c => c.Type == claimType);
         }
-
-        public virtual T FindClaimValue<T>(string claimType)
-            where T : struct
-        {
-            var value = FindClaimValue(claimType);
-            if (value == null)
-            {
-                return default;
-            }
-
-            return value.To<T>();
-        }
-
-        public virtual string FindClaimValue(string claimType)
-        {
-            return FindClaim(claimType)?.Value;
-        }
     }
 }

src/Volo.Abp.Session/Volo/Abp/Session/CurrentUserExtensions.cs

@@ -0,0 +1,26 @@
+using System;
+using JetBrains.Annotations;
+
+namespace Volo.Abp.Session
+{
+    public static class CurrentUserExtensions
+    {
+        [CanBeNull]
+        public static string FindClaimValue(this ICurrentUser currentUser, string claimType)
+        {
+            return currentUser.FindClaim(claimType)?.Value;
+        }
+
+        public static T FindClaimValue<T>(this ICurrentUser currentUser, string claimType)
+            where T : struct
+        {
+            var value = currentUser.FindClaimValue(claimType);
+            if (value == null)
+            {
+                return default;
+            }
+
+            return value.To<T>();
+        }
+    }
+}

src/Volo.Abp.Session/Volo/Abp/Session/ICurrentUser.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Security.Claims;
+using JetBrains.Annotations;
 
 namespace Volo.Abp.Session
 {
@@ -7,17 +8,16 @@ namespace Volo.Abp.Session
     {
         bool IsAuthenticated { get; }
 
+        [CanBeNull]
         Guid? Id { get; }
 
+        [CanBeNull]
         string UserName { get; }
 
+        [CanBeNull]
         string Email { get; }
 
+        [CanBeNull]
         Claim FindClaim(string claimType);
-
-        string FindClaimValue(string claimType);
-
-        T FindClaimValue<T>(string claimType)
-            where T : struct;
     }
 }