I have a base page (inherited from System.Web.UI.Page and all my pages inherit from this base page) in my .Net web application and at the moment if I put the following methods
protected void CheckAllowedRole(string UserName, List<string> AllowedRoles)
{
try
{
bool IsAllowed = false;
foreach (string item in AllowedRoles)
{
if (Roles.IsUserInRole(UserName, item))
IsAllowed = true;
}
if (!IsAllowed)
Response.Redirect("~/Members/Error.aspx", false);
}
catch (Exception err)
{
Response.Redirect("~/Members/Error.aspx", false);
}
}
for somereason it doesn't know the role is!?!? Return. I even pass the username into this methods and still doesn't work either.
But if I take this code and put into my page which inherited from this base page works well (no issue). Any ideas? Is there any restriction on the Roles (or Membership provider in the base class).
Thanks
instead of providing the user name why don't you try this:
protected void CheckAllowedRole(List<string> AllowedRoles)
{
try
{
if (!Page.User.Identity.IsAuthenticated)
throw new Exception("Unauthenticated User");
string name = Page.User.Identity.Name;
bool IsAllowed = false;
foreach (string item in AllowedRoles)
{
IsAllowed = Roles.IsUserInRole(name, item);
}
if (!IsAllowed)
Response.Redirect("~/Members/Error.aspx", false);
}
catch (Exception err)
{
Response.Redirect("~/Members/Error.aspx", false);
}
}
Related
I'm working on BluetoothLE, I want to see the devices around me in a list with their names, and I want to see the properties, services and characters of a device, but I can't see these devices even though the bluetooth of my phone and headset is turned on, the list always comes up empty.
Here is my sample code:
private GattCharacteristic gattCharacteristic;
private BluetoothLEDevice bluetoothLeDevice;
public List<DeviceInformation> bluetoothLeDevicesList = new List<DeviceInformation>();
public DeviceInformation selectedBluetoothLeDevice = null;
public bool IsScannerActiwe { get; set; }
public bool ButtonPressed { get; set; }
public bool IsConnected { get; set; }
public static string StopStatus = null;
public BluetoothLEAdvertisementWatcher watcher;
private DeviceWatcher deviceWatcher;
public void StartWatcher()
{
try
{
string[] requestedProperties = { "System.Devices.Aep.DeviceAddress", "System.Devices.Aep.IsConnected", "System.Devices.Aep.IsPresent", "System.Devices.Aep.ContainerId", "System.Devices.Aep.DeviceAddress", "System.Devices.Aep.Manufacturer", "System.Devices.Aep.ModelId", "System.Devices.Aep.ProtocolId", "System.Devices.Aep.SignalStrength" };
deviceWatcher =
DeviceInformation.CreateWatcher(
BluetoothLEDevice.GetDeviceSelectorFromPairingState(false),
requestedProperties,
DeviceInformationKind.AssociationEndpoint);
// Register event handlers before starting the watcher.
// Added, Updated and Removed are required to get all nearby devices
deviceWatcher.Added += DeviceWatcher_Added;
deviceWatcher.Updated += DeviceWatcher_Updated;
deviceWatcher.Removed += DeviceWatcher_Removed;
// EnumerationCompleted and Stopped are optional to implement.
deviceWatcher.EnumerationCompleted += DeviceWatcher_EnumerationCompleted;
deviceWatcher.Stopped += DeviceWatcher_Stopped;
// Start the watcher.
deviceWatcher.Start();
}
catch (Exception ex)
{
Console.WriteLine("Exception -> ", ex.Message);
}
}
public List<DeviceInformation> GetBluetoothLEDevicesList()
{
try
{
return bluetoothLeDevicesList;
}
catch (Exception ex)
{
Console.WriteLine("Exception Handled -> GetBluetoothLEDevices: " + ex);
throw ex;
}
}
public List<string> GetBluetoothLEDevices()
{
try
{
return bluetoothLeDevicesList.Select(x => x.Name).ToList();
}
catch (System.Exception ex)
{
Trace.WriteLine("Exception Handled -> GetBluetoothLEDevices: " + ex);
throw ex;
}
}
I started a few new advertisements with my iphone via the nrF Connect application and I can see it on my pc, but I want to put them all in a list and navigate through that list.
This is Test.cs:
class Test
{
static void Main(string[] args)
{
// Since the StartWatcher method is called from within the constructor method,
that method will always run whenever an instance is created.
BLEControllers bLEControllers = new BLEControllers();
var devices = bLEControllers.GetBluetoothLEDevicesList();
foreach (var device in devices)
{
if (device != null)
{
Console.WriteLine(device.Name);
}
Console.WriteLine("empty");
}
//bLEControllers.ConnectDevice(device);
//bLEControllers.ConnectDevice();
Console.Read();
}
}
Whenever I run this code, neither device names nor empty text appears on the console, only the startWatcher function works and ends. Is there any function to list all the devices? And how can I see the supported service and characteristic uuids? is there a way to do this?
I'm clicking on a product item in listview in product page viewmodel to show a popup(using rg.plugin popup) for selecting one of the product variants.After selecting variant,i am sending the selected variant to product page using messagingcenter from variant popup page viewmodel,subscribed in product page viewmodel constructor. working fine there.when i navigate to the previous page and then came back to this product page for adding one or more variant to the
same previously selected product,Messagingcenter subscribe called twice and product value increased twice.Tried to subscribe in the product page onappearing and unsubscribe in disappearing method.still calling two times? How to solve this issue?
calling popup:
var result = await dataService.Get_product_variant(store_id, product_id);
if (result.status == "success")
{
ind_vis = false;
OnPropertyChanged("ind_vis");
App.Current.Properties["product_variant_result"] = result;
App.Current.Properties["cartitems"] = purchaselist;
App.Current.Properties["selected_product"] = product_List2 ;
await PopupNavigation.Instance.PushAsync(new Popup_variant());
}
popup viewmodel: sending message
public Popup_variant_vm()
{
Radio_btn = new Command<Product_variant_list2>(Radio_stk_tapped);
product_variant_list = new List<Product_variant_list2>();
purchaselist = new ObservableCollection<Product_list2>();
show_variants();
}
internal void Confirm_variant()
{
if(App.Current.Properties.ContainsKey("selected_variant"))
{
MessagingCenter.Send<Popup_variant_vm, object>(this, "selected_variant", App.Current.Properties["selected_variant"]); //Message send from popup to product page
}
else
{
DependencyService.Get<IToast>().LongAlert("Please select any size");
}
}
product page viewmodel: subscribed here..called twice when navigating from previous page to this
public Store_page()
{
InitializeComponent();
}
protected override void OnAppearing()
{
base.OnAppearing();
var vm = new store_page_vm();
vm.Navigation = Navigation;
BindingContext = vm;
MessagingCenter.Unsubscribe<Popup_variant_vm, object>(this, "selected_variant");
MessagingCenter.Subscribe<Popup_variant_vm, object>(this, "selected_variant",async (sender, selected_variant) =>
{
var vm1 = BindingContext as store_page_vm;
vm1?.Addcart2(selected_variant);// called twice
});
}
unsubscribed in product cs page
protected override void OnDisappearing()
{
var vm = BindingContext as store_page_vm;
vm?.Save_cart();
MessagingCenter.Unsubscribe<Popup_variant_vm>(this, "selected_variant");
}
Your unsubscription should look something like below and it should work :
MessagingCenter.Unsubscribe<Popup_variant_vm, object>(this, "selected_variant");
https://stackoverflow.com/a/44753021/10937160
try this, and make sure you do not call Subscribe more than once.
My solution:
put unsubscribe sentence into subscribe body !!
MessagingCenter.Subscribe<object, string>(this, "IdSearch", (sender, arg) =>
{
listView.ItemsSource = arg;
MessagingCenter.Unsubscribe<object, string>(this, "IdSearch");
}, BindingContext);
I have created static counter variable in my app the in subscriber I have done this:
public static class Constants
{
public static int msgCenterSubscribeCounter { get; set; } = 0;
}
MessagingCenter.Subscribe<object, string>(this, "hello", (sender, arg) =>
{
Constants.msgCenterSubscribeCounter++;
if (arg.Equals("hello") && Constants.msgCenterSubscribeCounter == 1)
{
// handle your logic here
}
});
Reset counter in OnDisappearing() method from where you have called Send.
Changing Messagingcenter in to single subscription.
public class Messagingcenter_singleton
{
private static Messagingcenter_singleton _instance;
private bool isActivated = false;
private Action<string> callBackFun = null;
public static Messagingcenter_singleton Instance()
{
if (_instance == null)
{
_instance = new Messagingcenter_singleton();
}
return _instance;
}
public void setCallBack(Action<string> eventCallBack)
{
callBackFun = eventCallBack;
}
public void startSubscribe()
{
if (!isActivated)
{
isActivated = true;
MessagingCenter.Subscribe<string, string>(this, "Name", eventCallBack);
}
}
private void eventCallBack(string arg1, string arg2)
{
if (callBackFun != null)
{
InvokeMethod(new Action<string>(callBackFun), arg2);
}
}
public static object InvokeMethod(Delegate method, params object[] args)
{
return method.DynamicInvoke(args);
}
}
Use Below Code in you view model class
public void initSubscribe()
{
Messagingcenter_singleton.Instance().startSubscribe();
Messagingcenter_singleton.Instance().setCallBack(eventCallBack)
}
public void eventCallBack(string arg2)
{
// write your code here
}
I have a Shared Project where I have changed the database to Realm instead of SQLite.
My problem is, if I close the Realm in my DatabaseManager, the result is removed. Therefore i have created a static singelton instance of the Realm, which all my DatabaseManager use. Now my app crash after short time on memory, and if i remove all my database-functions, it works.
I create my Realm-instance here:
public class RealmDatabase
{
private Realm mRealmDB;
public Realm RealmDB
{
get
{
if (mRealmDB == null || mRealmDB.IsClosed)
{
SetRealm ();
}
return mRealmDB;
}
}
static RealmDatabase cCurrentInstance;
public static RealmDatabase Current
{
get
{
if (cCurrentInstance == null)
cCurrentInstance = new RealmDatabase ();
return cCurrentInstance;
}
}
public RealmDatabase ()
{
}
private void SetRealm ()
{
var config = new RealmConfiguration ("DBName.realm", true);
mRealmDB = Realm.GetInstance (config);
}
public Transaction BeginTransaction ()
{
return RealmDB.BeginWrite ();
}
}
The I have my DatabaseManagler looking like this:
public class NewFreeUserManager
{
internal Realm RealmDB = RealmDatabase.Current.RealmDB;
static NewFreeUserManager cCurrentInstance;
public static NewFreeUserManager Current
{
get
{
if (cCurrentInstance == null)
cCurrentInstance = new NewFreeUserManager ();
return cCurrentInstance;
}
}
private NewFreeUserManager ()
{
}
internal bool Save (FreeUser freeuser)
{
try
{
using (var trans = RealmDB.BeginWrite ())
{
RealmDB.RemoveAll<FreeUser> ();
var fu = RealmDB.CreateObject<FreeUser> ();
fu = freeuser;
trans.Commit ();
}
return true;
}
catch (Exception e)
{
Console.WriteLine ("FreeUser save: " + e.ToString ());
return false;
}
}
internal FreeUser Get ()
{
return RealmDB.All<FreeUser> ().FirstOrDefault ();
}
}
Can anyone help me?
there are a few issues with your current setup that prevent you from persisting objects properly.
The first and very important one is that Realm instances are not thread-safe. That is, using them as singletons is strongly discouraged, unless you are certain that you'll never access them from another thread.
The second is more subtle, but in your save method you are calling:
var fu = RealmDB.CreateObject<FreeUser>();
fu = freeuser;
What it does is, effectively, you are creating an object in the Realm, and then assigning the variable to another object. This will not assign freeuser's properties to fu, it just replaces one reference with another. What you're looking for is Realm.Manage so your code should look like this:
using (var trans = RealmDB.BeginWrite())
{
RealmDB.Manage(freeuser);
trans.Commit();
}
Once you fix the second bug, you should be able to go back and close Realm instances when you don't need them anymore.
I have register form. I want to check new username that is in db or not and if there is in DB , exception show next to it's textbox "UserName already exist...", what should I do?
this my method with exception that I have used it in Register action.:
public void InsertNewUser(MemberRegisterModel mm)
{
EShopThemeDBEntities context = new EShopThemeDBEntities(idbconnection.ConnStr);
using (context)
{
var listUsers = (from o in context.Users
select o.Username).ToList();
var a = listUsers.Count();
foreach (var item in listUsers)
{
if (mm.Username == item.ToString())
{
throw new Exception("UserName already exist...");
}
User mmr = new User();
mmr.FName = mm.FName;
mmr.LName = mm.LName;
mmr.Username = mm.Username;
mmr.Password = mm.Password;
mmr.Email = mm.Email;
mmr.Phone = mm.Phone;
mmr.Mobile = mm.Mobile;
mmr.CreateDate = DateTime.Now;
mmr.RoleId = 2;
context.AddToUsers(mmr);
context.SaveChanges();
}
}
You can set the Model error and return the model object back to view.
if(mm.Username == item.ToString())
{
ModelState.AddModelError("UserName","Username already taken";)
return View(model);
}
Also You do not need to get a list of usrs from database and do a loop to check whether the user entered user name exist or not. You can use the FirstOrDefault method to atleast one is there.
using (context)
{
var user=(from o in context.Users
where o.UserName==mm.UserName).FirstOrDefault();
if(user!=null)
{
ModelState.AddModelError("UserName","Username already taken";)
return View(model);
}
else
{
//Save new user info
}
}
Make sure you have the validation fields in your view, adjacent to the text box
#Html.TextBoxFor(m => m.UserName)
#Html.ValidationMessageFor(m => m.UserName)
But, Ideally, I would also do it asynchronosly with ajax to provide a rich user experience to the user. For that what you have to do is to look for the blur event of the text box and get the value of the textbox, make an ajax call to an action method which checks the availability of user name and return appropriate result.
<script type="text/javascript">
$(function(){
$("#UserName").blur(){
var userName=$(this).val();
$.getJSON("#Url.Action("Check","User")/"+userName,function(response){
if(response.status=="Available")
{
//It is available to register. May be show a green signal in UI
}
else
{
//not available. Show the message to user
$("#someMsgDIv").html("User name not available");
}
});
});
});
</script>
Now we should have an action method called Check in UserController to handle the ajax request
public ActionResult Check(string id)
{
bool isAvailable=false;
string userName=id;
//Check the user name is availabe here
if(isAvailable)
return Json(new { status="Available"},
JsonRequestBehaviour.AllowGet);
else
return Json(new { status="Not Available"},
JsonRequestBehaviour.AllowGet);
}
Note: Never do the client side approach only. Always do the server side checking no matter whether you have client side checking or not.
Shyju's answer is a thorough answer. However, based on your comments about handling the exception, here's a sample:
public void InsertNewUser(MemberRegisterModel mm)
{
// Some code...
if (userExists)
{
throw new ArgumentException("User name not available");
}
}
in your action method:
public ActionResult AddUser(MemberRegisterModel newUser)
{
try
{
var userManager = new MembersSrv();
userManager.InsertNewUser(newUser);
}
catch (ArgumentException ex)
{
if (ex.Message == "User name not available")
{
ModelState.AddModelError("UserName","Username already taken";)
return View(model);
}
}
}
Please note that the better way is to define a class which derives from Exception class (e.g. DuplicateUserNameException) and throw/catch that exception in your code. This sample code has been simplified.
I am creating my own custom authorize attribute, overriding the AuthorizeCore method and wanted to know if it is possible to access the Roles which have been passed into the authorize attribute tag.
So for instance if I have this:
[CustomAuthorize(Roles = "Administrator, Sales, Entry")]
Is it possible to access these from inside here:
protected override bool AuthorizeCore(HttpContextBase httpContext)
{
}
I could then split the string and create an array.
You can this this.Roles which is a string that you need to split.
The source code is freely available.
The default AuthorizeCore implementation:
protected virtual bool AuthorizeCore(HttpContextBase httpContext) {
if (httpContext == null) {
throw new ArgumentNullException("httpContext");
}
IPrincipal user = httpContext.User;
if (!user.Identity.IsAuthenticated) {
return false;
}
if (_usersSplit.Length > 0 && !_usersSplit.Contains(user.Identity.Name, StringComparer.OrdinalIgnoreCase)) {
return false;
}
if (_rolesSplit.Length > 0 && !_rolesSplit.Any(user.IsInRole)) {
return false;
}
return true;
}
And they have an internal split function which looks like this:
internal static string[] SplitString(string original) {
if (String.IsNullOrEmpty(original)) {
return new string[0];
}
var split = from piece in original.Split(',')
let trimmed = piece.Trim()
where !String.IsNullOrEmpty(trimmed)
select trimmed;
return split.ToArray();
}