用户签名缓存

src/Shentun.Peis.Domain/CacheService.cs

@@ -203,7 +203,11 @@ namespace Shentun.Peis
             var userExtension = (IdentityUserWithExtensionDto)_userExtensionCache.Get(cacheKey);
             if (userExtension == null)
             {
-                var userEntity = await _userRepository.GetAsync(o => o.Id == id);
+                var userEntity = await _userRepository.FirstOrDefaultAsync(o => o.Id == id);
+                if (userEntity == null)
+                {
+                    return "";
+                }
                 var userSign = userEntity.GetProperty<string>("user_sign");
                 var userPhoto = userEntity.GetProperty<string>("user_photo");
                 userExtension = new IdentityUserWithExtensionDto