sto usando ASP.Net MVC 5 e sto chiamando questa linea in tutto il mio codiceUser.Identity.GetUserId è memorizzato nella cache o recupera dal database ogni volta?
string userId = User.Identity.GetUserId();
fa ASP.NET MVC andare a prendere questo dalla tabella per ogni chiamata, o lo fa entrare nella cache ?
Sembra che il insieme allo username siano memorizzati nella cache quando si effettua il login.
Ho usato SQL Server Profiler e dopo il login l'esecuzione User.Identity.GetUserId(); il sistema di identità fatto non interroga al database.
Questa è la query fatta su loggin:
exec sp_executesql N'SELECT
[UnionAll2].[C2] AS [C1],
[UnionAll2].[C3] AS [C2],
[UnionAll2].[C4] AS [C3],
[UnionAll2].[C5] AS [C4],
[UnionAll2].[C6] AS [C5],
[UnionAll2].[C7] AS [C6],
[UnionAll2].[C8] AS [C7],
[UnionAll2].[C9] AS [C8],
[UnionAll2].[C10] AS [C9],
[UnionAll2].[C11] AS [C10],
[UnionAll2].[C12] AS [C11],
[UnionAll2].[C13] AS [C12],
[UnionAll2].[C14] AS [C13],
[UnionAll2].[C1] AS [C14],
[UnionAll2].[C15] AS [C15],
[UnionAll2].[C16] AS [C16],
[UnionAll2].[C17] AS [C17],
[UnionAll2].[C18] AS [C18],
[UnionAll2].[C19] AS [C19],
[UnionAll2].[C20] AS [C20],
[UnionAll2].[C21] AS [C21],
[UnionAll2].[C22] AS [C22],
[UnionAll2].[C23] AS [C23],
[UnionAll2].[C24] AS [C24],
[UnionAll2].[C25] AS [C25]
FROM (SELECT
[UnionAll1].[C1] AS [C1],
[UnionAll1].[AccessFailedCount] AS [C2],
[UnionAll1].[Id] AS [C3],
[UnionAll1].[Email] AS [C4],
[UnionAll1].[EmailConfirmed] AS [C5],
[UnionAll1].[PasswordHash] AS [C6],
[UnionAll1].[SecurityStamp] AS [C7],
[UnionAll1].[PhoneNumber] AS [C8],
[UnionAll1].[PhoneNumberConfirmed] AS [C9],
[UnionAll1].[TwoFactorEnabled] AS [C10],
[UnionAll1].[LockoutEndDateUtc] AS [C11],
[UnionAll1].[LockoutEnabled] AS [C12],
[UnionAll1].[AccessFailedCount1] AS [C13],
[UnionAll1].[UserName] AS [C14],
[UnionAll1].[UserId] AS [C15],
[UnionAll1].[RoleId] AS [C16],
[UnionAll1].[UserId1] AS [C17],
[UnionAll1].[C2] AS [C18],
[UnionAll1].[C3] AS [C19],
[UnionAll1].[C4] AS [C20],
[UnionAll1].[C5] AS [C21],
[UnionAll1].[C6] AS [C22],
[UnionAll1].[C7] AS [C23],
[UnionAll1].[C8] AS [C24],
[UnionAll1].[C9] AS [C25]
FROM (SELECT
CASE WHEN ([Extent2].[UserId] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1],
[Limit1].[AccessFailedCount] AS [AccessFailedCount],
[Limit1].[Id] AS [Id],
[Limit1].[Email] AS [Email],
[Limit1].[EmailConfirmed] AS [EmailConfirmed],
[Limit1].[PasswordHash] AS [PasswordHash],
[Limit1].[SecurityStamp] AS [SecurityStamp],
[Limit1].[PhoneNumber] AS [PhoneNumber],
[Limit1].[PhoneNumberConfirmed] AS [PhoneNumberConfirmed],
[Limit1].[TwoFactorEnabled] AS [TwoFactorEnabled],
[Limit1].[LockoutEndDateUtc] AS [LockoutEndDateUtc],
[Limit1].[LockoutEnabled] AS [LockoutEnabled],
[Limit1].[AccessFailedCount] AS [AccessFailedCount1],
[Limit1].[UserName] AS [UserName],
[Extent2].[UserId] AS [UserId],
[Extent2].[RoleId] AS [RoleId],
[Extent2].[UserId] AS [UserId1],
CAST(NULL AS int) AS [C2],
CAST(NULL AS varchar(1)) AS [C3],
CAST(NULL AS varchar(1)) AS [C4],
CAST(NULL AS varchar(1)) AS [C5],
CAST(NULL AS varchar(1)) AS [C6],
CAST(NULL AS varchar(1)) AS [C7],
CAST(NULL AS varchar(1)) AS [C8],
CAST(NULL AS varchar(1)) AS [C9]
FROM (SELECT TOP (1)
[Extent1].[Id] AS [Id],
[Extent1].[Email] AS [Email],
[Extent1].[EmailConfirmed] AS [EmailConfirmed],
[Extent1].[PasswordHash] AS [PasswordHash],
[Extent1].[SecurityStamp] AS [SecurityStamp],
[Extent1].[PhoneNumber] AS [PhoneNumber],
[Extent1].[PhoneNumberConfirmed] AS [PhoneNumberConfirmed],
[Extent1].[TwoFactorEnabled] AS [TwoFactorEnabled],
[Extent1].[LockoutEndDateUtc] AS [LockoutEndDateUtc],
[Extent1].[LockoutEnabled] AS [LockoutEnabled],
[Extent1].[AccessFailedCount] AS [AccessFailedCount],
[Extent1].[UserName] AS [UserName]
FROM [dbo].[AspNetUsers] AS [Extent1]
WHERE [Extent1].[Id] = @p__linq__0) AS [Limit1]
LEFT OUTER JOIN [dbo].[AspNetUserRoles] AS [Extent2] ON [Limit1].[Id] = [Extent2].[UserId]
UNION ALL
SELECT
2 AS [C1],
[Limit2].[AccessFailedCount] AS [AccessFailedCount],
[Limit2].[Id] AS [Id],
[Limit2].[Email] AS [Email],
[Limit2].[EmailConfirmed] AS [EmailConfirmed],
[Limit2].[PasswordHash] AS [PasswordHash],
[Limit2].[SecurityStamp] AS [SecurityStamp],
[Limit2].[PhoneNumber] AS [PhoneNumber],
[Limit2].[PhoneNumberConfirmed] AS [PhoneNumberConfirmed],
[Limit2].[TwoFactorEnabled] AS [TwoFactorEnabled],
[Limit2].[LockoutEndDateUtc] AS [LockoutEndDateUtc],
[Limit2].[LockoutEnabled] AS [LockoutEnabled],
[Limit2].[AccessFailedCount] AS [AccessFailedCount1],
[Limit2].[UserName] AS [UserName],
CAST(NULL AS varchar(1)) AS [C2],
CAST(NULL AS varchar(1)) AS [C3],
CAST(NULL AS varchar(1)) AS [C4],
[Extent4].[Id] AS [Id1],
[Extent4].[UserId] AS [UserId],
[Extent4].[ClaimType] AS [ClaimType],
[Extent4].[ClaimValue] AS [ClaimValue],
CAST(NULL AS varchar(1)) AS [C5],
CAST(NULL AS varchar(1)) AS [C6],
CAST(NULL AS varchar(1)) AS [C7],
CAST(NULL AS varchar(1)) AS [C8]
FROM (SELECT TOP (1)
[Extent3].[Id] AS [Id],
[Extent3].[Email] AS [Email],
[Extent3].[EmailConfirmed] AS [EmailConfirmed],
[Extent3].[PasswordHash] AS [PasswordHash],
[Extent3].[SecurityStamp] AS [SecurityStamp],
[Extent3].[PhoneNumber] AS [PhoneNumber],
[Extent3].[PhoneNumberConfirmed] AS [PhoneNumberConfirmed],
[Extent3].[TwoFactorEnabled] AS [TwoFactorEnabled],
[Extent3].[LockoutEndDateUtc] AS [LockoutEndDateUtc],
[Extent3].[LockoutEnabled] AS [LockoutEnabled],
[Extent3].[AccessFailedCount] AS [AccessFailedCount],
[Extent3].[UserName] AS [UserName]
FROM [dbo].[AspNetUsers] AS [Extent3]
WHERE [Extent3].[Id] = @p__linq__0) AS [Limit2]
INNER JOIN [dbo].[AspNetUserClaims] AS [Extent4] ON [Limit2].[Id] = [Extent4].[UserId]) AS [UnionAll1]
UNION ALL
SELECT
3 AS [C1],
[Limit3].[AccessFailedCount] AS [AccessFailedCount],
[Limit3].[Id] AS [Id],
[Limit3].[Email] AS [Email],
[Limit3].[EmailConfirmed] AS [EmailConfirmed],
[Limit3].[PasswordHash] AS [PasswordHash],
[Limit3].[SecurityStamp] AS [SecurityStamp],
[Limit3].[PhoneNumber] AS [PhoneNumber],
[Limit3].[PhoneNumberConfirmed] AS [PhoneNumberConfirmed],
[Limit3].[TwoFactorEnabled] AS [TwoFactorEnabled],
[Limit3].[LockoutEndDateUtc] AS [LockoutEndDateUtc],
[Limit3].[LockoutEnabled] AS [LockoutEnabled],
[Limit3].[AccessFailedCount] AS [AccessFailedCount1],
[Limit3].[UserName] AS [UserName],
CAST(NULL AS varchar(1)) AS [C2],
CAST(NULL AS varchar(1)) AS [C3],
CAST(NULL AS varchar(1)) AS [C4],
CAST(NULL AS int) AS [C5],
CAST(NULL AS varchar(1)) AS [C6],
CAST(NULL AS varchar(1)) AS [C7],
CAST(NULL AS varchar(1)) AS [C8],
[Extent6].[LoginProvider] AS [LoginProvider],
[Extent6].[ProviderKey] AS [ProviderKey],
[Extent6].[UserId] AS [UserId],
[Extent6].[UserId] AS [UserId1]
FROM (SELECT TOP (1)
[Extent5].[Id] AS [Id],
[Extent5].[Email] AS [Email],
[Extent5].[EmailConfirmed] AS [EmailConfirmed],
[Extent5].[PasswordHash] AS [PasswordHash],
[Extent5].[SecurityStamp] AS [SecurityStamp],
[Extent5].[PhoneNumber] AS [PhoneNumber],
[Extent5].[PhoneNumberConfirmed] AS [PhoneNumberConfirmed],
[Extent5].[TwoFactorEnabled] AS [TwoFactorEnabled],
[Extent5].[LockoutEndDateUtc] AS [LockoutEndDateUtc],
[Extent5].[LockoutEnabled] AS [LockoutEnabled],
[Extent5].[AccessFailedCount] AS [AccessFailedCount],
[Extent5].[UserName] AS [UserName]
FROM [dbo].[AspNetUsers] AS [Extent5]
WHERE [Extent5].[Id] = @p__linq__0) AS [Limit3]
INNER JOIN [dbo].[AspNetUserLogins] AS [Extent6] ON [Limit3].[Id] = [Extent6].[UserId]) AS [UnionAll2]
ORDER BY [UnionAll2].[C3] ASC, [UnionAll2].[C1] ASC',N'@p__linq__0 nvarchar(4000)',@p__linq__0=N'b73f9738-76ed-48d5-a8fd-cbf23a233fe9'
Guardando le fonti decompilati di Microsoft.AspNet.Identity.Core.dll, si può vedere che recupera l'ID utente dalle rivendicazioni della corrente identità. Quindi non recupera queste informazioni dal database.
public static string GetUserId(this IIdentity identity)
{
if (identity == null)
throw new ArgumentNullException("identity");
ClaimsIdentity identity1 = identity as ClaimsIdentity;
if (identity1 != null)
return IdentityExtensions.FindFirstValue(identity1, "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier");
return (string) null;
}