ASP. NET Identity Role-rights Management 8

Source: Internet
Author: User

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

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