如何解决Entity Framework Core 中的属性/列级别访问
在 this 问题中，我询问了一种在 .NET 5 中实现属性/字段级别访问的方法。一个想法是在 EF Core 配置中实现魔法，以便仅从数据库加载这些属性当前用户有权访问。在第二步中，使用默认条件的 function AutoComment(comment_char,comment_boolean) range
if len(a:comment_char) == 0
let comment_character = GetCommentChar()
else
let comment_character = a:comment_char
endif
let vis_length = a:lastline - a:firstline
let vis_length = vis_length . 'j'
if vis_length == '0j'
let vis_length = ''
endif
" get first character in a line.
let move_to_first = "normal! mq^"
execute move_to_first
let line = getline('.')
let first_nonspace = col('.') - 1
let end_char = first_nonspace + strlen(comment_character) - 1
let current_chars = line[first_nonspace : end_char]
" let current_char = matchstr(getline('.'),'\%' . col('.') . 'c.')
" echo current_char
let change_line = "normal! \<C-V>" . vis_length
if a:comment_boolean == 'c'
let change_line = change_line . "I" . comment_character . " "
elseif a:comment_boolean == 'u'
if current_chars == comment_character
let move_right = strlen(comment_character)
let change_line = change_line . move_right . "lx"
endif
endif
" Can add additional line here to highlight the prevIoUs lines
" Can't decide a way that it'll work seamlessly,so ignore for Now.
let change_line = change_line . "\<esc>`q"
" echo change_line
execute change_line
endfunction
属性将空属性从 dto 中排除。我已尽力使用实体属性上的自定义属性属性在上下文的 JsonIgnore 挂钩中实现逻辑：
OnModelCreatingpublic class MyEntity : BaseEntity
{
[IncludeForRoles(RoleNames.Staff)]
public string InternalDetails { get; private set; }
}
public class MyContext : IdentityDbContext<User,Role,Guid>,IMyContext
{
private readonly ITokenAccessor _tokenAccessor;
public MyContext(
DbContextOptions options,ITokenAccessor tokenAccessor) : base(options)
{
_tokenAccessor = tokenAccessor;
}
[...]
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
builder.ApplyConfigurationsFromAssembly(typeof(UserConfiguration).Assembly);
foreach (Type type in MyContextUtility.GetEntityTypes())
{
MethodInfo ignoreFlagMethod = MyContextUtility.SetRoleBasedIgnoreFlagMethod.MakeGenericmethod(type);
ignoreFlagMethod.Invoke(this,new object[] { builder,_tokenAccessor.UserRoles });
}
}
}
public static class MyContextUtility
{
private static IList<Type> _entityTypeCache;
public static IList<Type> GetEntityTypes()
{
if (_entityTypeCache != null)
{
return _entityTypeCache.ToList();
}
Assembly assembly = typeof(BaseEntity).Assembly;
_entityTypeCache = (from t in assembly.DefinedTypes
where t.BaseType == typeof(BaseEntity)
select t.AsType()).ToList();
return _entityTypeCache;
}
public static readonly MethodInfo SetRoleBasedIgnoreFlagMethod
= typeof(MyContextUtility).getmethods(BindingFlags.Public | BindingFlags.Static)
.Single(t => t.IsGenericmethod && t.Name == nameof(SetRoleBasedIgnoreFlag));
public static void SetRoleBasedIgnoreFlag<T>(ModelBuilder builder,IList<string> userRoles) where T : BaseEntity
{
IEnumerable<PropertyInfo> props = typeof(T).GetProperties().Where(
prop => Attribute.IsDefined(prop,typeof(IncludeForRolesAttribute)));
foreach (PropertyInfo prop in props)
{
IncludeForRolesAttribute attr = prop.GetCustomAttribute<IncludeForRolesAttribute>();
if (!userRoles.Intersect(attr.RoleNames).Any())
{
Debug.WriteLine($"Adding ignore flag for type '{typeof(T).Name}' and property {prop.Name}.");
builder.Entity<T>().Ignore(prop.Name);
}
}
}
}
提供对当前用户的 jwt 访问令牌的访问。
上面的代码不起作用，因为 ITokenAccessor 在用户登录之前执行，这就是 OnModelCreating 此时始终为空的原因。
有没有办法在实体框架核心中实现基于属性/列的访问？我花了几个小时研究，但不幸的是找不到解决方案。而且我很惊讶基于属性/列的访问应该是一个不寻常的要求。
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