asp.net - 使用依赖注入访问 EF 使用 HtmlHelper 静态类中的层服务
问题描述
通过服务层访问实体，如何在静态类中使用？我的示例代码是我遇到以下错误！
操作无法完成，因为 DbContext 已被释放。
示例代码：
public static class ActionLinkPermissionHelper
{
private static readonly IUserService _userService;
static ActionLinkPermissionHelper()
{
_userService = DependencyResolver.Current.GetService<IUserService>();
}
public static bool CheckActionPermission(string controllerName, string actionName, string requestType, string controllerNamespace = null)
{
if (HttpContext.Current.User.Identity.IsAuthenticated)
{
string username = HttpContext.Current.User.Identity.Name;
var users = _userService.GetUser(username);
// If User Is SuperAdmin, Do Nothing!
var user = _userService.GetUser(users.UserID);
if (user.IsSuperAdmin)
{
return true;
}
List<PermissionListItem> allPermissions = PermissionsHelper.GetAllPermissions();
// Now Check If Permission Requires Authorization And User Has This Permission
string currentActionFullName = controllerName + actionName;// + requestType;
var requestedAction = allPermissions.FirstOrDefault(pr => pr.ActionFullName == currentActionFullName);
if (requestedAction != null && (requestedAction.PermissiongRequiresAuthorization || requestedAction.PermissiongGroupRequiresAuthorization) && !requestedAction.PermissionAllowAnonymous)
{
List<PermissionListItem> userPermissionItems = PermissionsHelper.GetUserPermissions();
if (!userPermissionItems.Any(upr =>
upr.ActionFullName == currentActionFullName
&& upr.PermissiongGroupName == controllerName
&& (controllerNamespace == null || upr.PermissiongGroupNamespace == controllerNamespace)))
{
return false;
}
}
}
return true;
}
}
public static MvcHtmlString ActionLinkPermission(this HtmlHelper htmlHelper, string linkText, string actionName)
{
string controllerNamespace = htmlHelper.ViewContext.Controller.GetType().Namespace;
string controllername = (string)htmlHelper.ViewContext.RouteData.GetRequiredString("controller");
string requestMethod = (string)htmlHelper.ViewContext.HttpContext.Request.HttpMethod;
if (!CheckActionPermission(controllername, actionName, requestMethod, controllerNamespace))
{
return null;
}
return htmlHelper.ActionLink(linkText, actionName);
}