ASP. NET Identity Role-rights Management 8

1. Typical application Scenario 1.1. EF data Storage

The core of EF is the data context DbContext, which provides a basic method of data storage operations.

1.1.1. New

Take the method of adding objects.

Create permissions var permission = new Applicationpermission { Id = Item. Gdb Action = Item. Action, Controller = Item. Controller, Description = Item. Description }; _db. Permissions.add (permission); Save Await _db. Savechangesasync ();

1.1.2. modifying

Adopt the method of modifying entity state.

_db. Entry (applicationpermission). state = entitystate.modified; _db. SaveChanges ();

1.1.3. deleting

The way to remove objects is used.

Applicationpermission applicationpermission = _db. Permissions.find (ID); _db. Permissions.remove (applicationpermission); _db. SaveChanges ();

Adopt the method of modifying entity state.

Delete permission var entity = new Applicationrolepermission {Roleid = Roleid, PermissionID = PermissionID}; _db. Set<applicationrolepermission> (). Attach (entity); _db. Entry (entity). state = entitystate.deleted; var result = await _db. Savechangesasync ();

1.1.4. Query

Part of the code in the sample project.

Fetch Data context var context = HttpContext.Current.GetOwinContext (). Get<applicationdbcontext> (); Take a role var role = context. Roles.include (r = r.permissions). FirstOrDefault (t = t.id = = Roleid); Take a list of permission IDs var rolepermissionids = role. Permissions.select (t = t.permissionid); Fetch permission List Permissions = context. Permissions.where (p = rolepermissionids.contains (p.id)). ToList (); var permissions = await _db. Permissions.tolistasync (); Applicationpermission applicationpermission = _db. Permissions.find (ID);

1.2. Custom Comparator 1.2.1. Equality comparison IEqualityComparer

Applicationpermission objects need to compare the Controller, action, and description in order, which is a custom rule, for which the comparer implements the equality comparison interface IEqualityComparer.

public class Applicationpermissionequalitycomparer:iequalitycomparer<applicationpermission> { public bool Equals (applicationpermission x, applicationpermission y) { Compare ID First if (String.Compare (X.id, y.id, true) = = 0) { return true; } Then compare controller,action,description and params if (X.controller = = Y.controller | | x.action = Y.action | | x.description = y.description) { return true; } Else { return false; } } public int GetHashCode (Applicationpermission obj) { var str = string. Format ("{0}-{1}-{2}", obj. Controller, obj. Action, obj. Description); Return str. GetHashCode (); } }

Use the comparer in contains.

is authorized if (Rolepermissions.contains (Action, New Applicationpermissionequalitycomparer ())) { return true; } Else { return false; }

Use the comparer in except.

Fetching Assembly permissions var allpermissions = _permissionsofassembly; Fetch database already has permissions var dbpermissions = _db. Permissions.tolist (); Take the difference between the two sets var permissions = allpermissions.except (dbpermissions, New Applicationpermissionequalitycomparer ());

1.2.2. Size comparison IComparer

Permissionviewmodel needs to be sorted by controller, action, and a custom rule, which is to implement the size comparison interface IComparer.

public class Permissionviewmodelcomparer:icomparer<permissionviewmodel> { public int Compare (Permissionviewmodel x, Permissionviewmodel y) { Equal if the ID is the same if (String.Compare (X.id, y.id, true) = = 0) { return 0; } Controller comparison var controllercompareresult = String.Compare (X.controller, Y.controller, true); Action comparison var actioncompareresult = String.Compare (X.action, y.action, true); Compare controllers first, then compare action if (Controllercompareresult! = 0) { return controllercompareresult; } Else { return actioncompareresult; } } }

Use the comparer.

Sort Permissionviews.sort (New Permissionviewmodelcomparer ());

ASP. NET Identity Role-rights Management 8