I had some code using the RoleManager that I had copied from an MVC project to create roles in a Blazor project.
It compiles okay but when I step through the code it gets to that line and then appears to throw and exception, as it doesn't ever go to the next line. I am unable to catch an exception though.
Since my code didn't work I found code on the web and it behaved the same, so I changed how it was injected and I got a different error, so I found a third way of doing it and that too gets to the line that tests to see if there is a role already existing and blows up.
Here is the latest attempt
[Inject]
IServiceProvider services {get;set;}
public async Task Initialize()
{
using (var roleManager = services.GetRequiredService<RoleManager<IdentityRole>>())
{
string proRole = "Pro";
if (!await roleManager.RoleExistsAsync(proRole))
{
var temp = await roleManager.CreateAsync(new IdentityRole { Name = proRole });
}
}
}
And it blows up on the awaited if statement.
Here is the previous code that should work that doesn't.
string proRole = "Pro";
string proClientRole = "ProClient";
if (!await _roleManager.RoleExistsAsync(proRole))
{
var temp = await _roleManager.CreateAsync(new IdentityRole { Name = proRole });
}
which is inside of a method.
I also had it as #{code in the Razor file and after an hour of trying different things there I moved it to a base class because they have been more stable in the past.
It is not the database connection because that is well verified and also because UserManager is called in the same class and it work
I also tried this code (Blazor Role Management Add Role trough UI (Crud)) both suggestions.
This is one bad thing about Blazor for me is it is buggy I never know if it is my bad, or just something wrong with the latest greatest. But I am assuming it is my bad in this case.
Anyway any help would be much appreciated, I am way too many hours on this,
I copy/pasted the same code to the "/" page and it works there.
For some reason it wouldn't work in a component loaded into a component but the standard Role code works as expected in the "/" page.
Most likely I should have restarted my computer as it now works in the original location too.
Ok, I am officially confused.
In Shiro I have my own realm (DatastoreRealm) that extends AuthorizingRealm. In my DatastoreRealm, I have the method "clearCachedAuthorizationInfo" which allows me to clear the users permissions, etc, (and then re-check) when those permissions change on the fly.
In order to get to that method, I have to get access to my DatastoreRealm object.
I do this in the following way...
private static Realm lookupRealm(String realmName) {
SecurityManager securityManager = SecurityUtils.getSecurityManager();
RealmSecurityManager realmSecurityManager = (RealmSecurityManager) securityManager;
Collection<Realm> realms = realmSecurityManager.getRealms();
for (Realm realm : realms) {
if (realm.getName().equalsIgnoreCase(realmName)) {
log.info("look up realm name is : " + realm.getName());
return realm;
}
}
return null; }
This seems to work fine. It returns me a "DatastoreRealm" object.
Although when I call this method, I am forced to do the following...
DatastoreRealm dsRealm = (DatastoreRealm) lookupRealm("rfRealm");
Which throws a "ClassCastException" telling me...
rf.gae.DatastoreRealm cannot be cast to rf.gae.DatastoreRealm
How/Why is this happening???
If I DON'T cast, and simply use the "Realm" object, the "clearCachedAuthorizationInfo" is not available to me!
Thanks in advance for the help!
Well with a bit more digging, I figured out the problem.
The web framework that I'm using has the ability to "hot reload" classes which prevents having to restart the server on each code change.
The problem with this is that a new classloader loads the edited class, and thus when a cast is attempted, the class in memory cannot be cast to the new class loaded by the classloader!
For classes to be cast, they have to be of the same type and loaded by the same classloader.
Turning this feature off corrected my casting issue.
I am using Visual Studio Express 2012 for Windows Phone and building an app targeting Windows Phone 7.1.
I am trying to use NavigationService to navigate to a different page but I keep running into problems.
Here is my code:
private void GotoDetails(object _url)
{
var url = string.Format("/DetailsPage.xaml?url={0}", _url.ToString());
NavigationService nav = new NavigationService();
nav.Navigate(new Uri(url, UriKind.Relative));
}
when I try to build this I get a "The type 'System.Windows.Navigation.NavigationService' has no constructors defined" on the NavigationService nav =.... line.
If I try to do just NavigationService.Navigate(new Uri(url, UriKind.Relative)); then I get a "An object reference is required for the non-static field, method, or property 'System.Windows.Navigation.NavigationService.Navigate(System.Uri)'" error.
update: I am trying to use MVVM (for the first time). This code resides in my view model. I am not using any frameworks. Just trying to learn it from scratch.
I have searched the intertubes but cannot seem to find a solution.
Any help is much appreciated.
Kamal
are you inside a page? NavigationService is a property of the Page class: http://msdn.microsoft.com/en-us/library/system.windows.controls.page.navigationservice(v=vs.92).aspx
I'm using Monorail in my C# web application. Since I upgrated it (.Net Framework 2 to 4 and Monorail 1.0.3 to 2.1RC), my ViewComponent class is not found. All my controllers seem to work fine. I'm using nVelocity View Engine. I'm not using Windsor, but maybe now I'm suppose to register it in a certain way?
In the .vm file, I experimented the following lines (without success, the first one was working before I upgraded the project) :
#component(MenuComponent)
#component(MenuComponent with "role=admins")
#blockcomponent(MenuComponent with "role=admins")
Did anyone experiment that?
The full error message is:
ViewComponent 'MenuComponent' could
not be found. Was it registered? If
you have enabled Windsor Integration,
then it's likely that you have forgot
to register the view component as a
Windsor component. If you are sure you
did it, then make sure the name used
is the component id or the key passed
to ViewComponentDetailsAttribute
Many thanks!
I finally found a clue to my problem. I used 'Castle.Monorail.Framework.dll' source code to see what happen inside : it seems that assemblies specified in the Web.Config file (in <Controllers> or even in <viewcomponents>) are not 'inspected' as they are supposed to be because the variable which contains it is initialized too late.
I builded a new version of the dll and now it's working fine. I will submit my 'fixed' code to the Castle Project Community to be sure it's not the consequence of something else (like bad settings).
Til then here is my 'fix', I just moved a portion of code. You can find the original source code here : http://www.symbolsource.org/Public/Metadata/Default/Project/Castle/1.0-RC3/Debug/All/Castle.MonoRail.Framework/Castle.MonoRail.Framework/Services/DefaultViewComponentFactory.cs
*Assembly:* Castle.MonoRail.Framework
*Class:* Castle.MonoRail.Framework.Services.**DefaultViewComponentFactory**
public override void Service(IServiceProvider provider)
{
/* Here is the section I moved */
var config = (IMonoRailConfiguration)provider.GetService(typeof(IMonoRailConfiguration));
if (config != null)
{
assemblies = config.ViewComponentsConfig.Assemblies;
if (assemblies == null || assemblies.Length == 0)
{
// Convention: uses the controller assemblies in this case
assemblies = config.ControllersConfig.Assemblies.ToArray();
}
}
/*******************************/
base.Service(provider); // Assemblies inspection is done there
var loggerFactory = (ILoggerFactory) provider.GetService(typeof(ILoggerFactory));
if (loggerFactory != null)
{
logger = loggerFactory.Create(typeof(DefaultViewComponentFactory));
}
/* The moved section was here */
}
I'm curious, without your fix, if you rename MenuComponent to just Menu, does it work?
Here is the situation:
Silverlight 3 Application hits an asp.net hosted WCF service to get a list of items to display in a grid. Once the list is brought down to the client it is cached in IsolatedStorage. This is done by using the DataContractSerializer to serialize all of these objects to a stream which is then zipped and then encrypted. When the application is relaunched, it first loads from the cache (reversing the process above) and the deserializes the objects using the DataContractSerializer.ReadObject() method. All of this was working wonderfully under all scenarios until recently with the entire "load from cache" path (decrypt/unzip/deserialize) taking hundreds of milliseconds at most.
On some development machines but not all (all machines Windows 7) the deserialize process - that is the call to ReadObject(stream) takes several minutes an seems to lock up the entire machine BUT ONLY WHEN RUNNING IN THE DEBUGGER in VS2008. Running the Debug configuration code outside the debugger has no problem.
One thing that seems to look suspicious is that when you turn on stop on Exceptions, you can see that the ReadObject() throws many, many System.FormatException's indicating that a number was not in the correct format. When I turn off "Just My Code" thousands of these get dumped to the screen. None go unhandled. These occur both on the read back from the cache AND on a deserialization at the conclusion of a web service call to get the data from the WCF Service. HOWEVER, these same exceptions occur on my laptop development machine that does not experience the slowness at all. And FWIW, my laptop is really old and my desktop is a 4 core, 6GB RAM beast.
Again, no problems unless running under the debugger in VS2008. Anyone else seem this? Any thoughts?
Here is the bug report link: https://connect.microsoft.com/VisualStudio/feedback/details/539609/very-slow-performance-deserializing-using-datacontractserializer-in-a-silverlight-application-only-in-debugger
EDIT: I now know where the FormatExceptions are coming from. It seems that they are "by design" - they occur when when I have doubles being serialized that are double.NaN so that that xml looks like NaN...It seems that the DCS tries to parse the value as a number, that fails with an exception and then it looks for "NaN" et. al. and handles them. My problem is not that this does not work...it does...it is just that it completely cripples the debugger. Does anyone know how to configure the debugger/vs2008sp1 to handle this more efficiently.
cartden,
You may want to consider switching over to XMLSerializer instead. Here is what I have determined over time:
The XMLSerializer and DataContractSerializer classes provides a simple means of serializing and deserializing object graphs to and from XML.
The key differences are:
1.
XMLSerializer has much smaller payload than DCS if you use [XmlAttribute] instead of [XmlElement]
DCS always store values as elements
2.
DCS is "opt-in" rather than "opt-out"
With DCS you explicitly mark what you want to serialize with [DataMember]
With DCS you can serialize any field or property, even if they are marked protected or private
With DCS you can use [IgnoreDataMember] to have the serializer ignore certain properties
With XMLSerializer public properties are serialized, and need setters to be deserialized
With XmlSerializer you can use [XmlIgnore] to have the serializer ignore public properties
3.
BE AWARE! DCS.ReadObject DOES NOT call constructors during deserialization
If you need to perform initialization, DCS supports the following callback hooks:
[OnDeserializing], [OnDeserialized], [OnSerializing], [OnSerialized]
(also useful for handling versioning issues)
If you want the ability to switch between the two serializers, you can use both sets of attributes simultaneously, as in:
[DataContract]
[XmlRoot]
public class ProfilePerson : NotifyPropertyChanges
{
[XmlAttribute]
[DataMember]
public string FirstName { get { return m_FirstName; } set { SetProperty(ref m_FirstName, value); } }
private string m_FirstName;
[XmlElement]
[DataMember]
public PersonLocation Location { get { return m_Location; } set { SetProperty(ref m_Location, value); } }
private PersonLocation m_Location = new PersonLocation(); // Should change over time
[XmlIgnore]
[IgnoreDataMember]
public Profile ParentProfile { get { return m_ParentProfile; } set { SetProperty(ref m_ParentProfile, value); } }
private Profile m_ParentProfile = null;
public ProfilePerson()
{
}
}
Also, check out my Serializer class that can switch between the two:
using System;
using System.IO;
using System.Runtime.Serialization;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
namespace ClassLibrary
{
// Instantiate this class to serialize objects using either XmlSerializer or DataContractSerializer
internal class Serializer
{
private readonly bool m_bDCS;
internal Serializer(bool bDCS)
{
m_bDCS = bDCS;
}
internal TT Deserialize<TT>(string input)
{
MemoryStream stream = new MemoryStream(input.ToByteArray());
if (m_bDCS)
{
DataContractSerializer dc = new DataContractSerializer(typeof(TT));
return (TT)dc.ReadObject(stream);
}
else
{
XmlSerializer xs = new XmlSerializer(typeof(TT));
return (TT)xs.Deserialize(stream);
}
}
internal string Serialize<TT>(object obj)
{
MemoryStream stream = new MemoryStream();
if (m_bDCS)
{
DataContractSerializer dc = new DataContractSerializer(typeof(TT));
dc.WriteObject(stream, obj);
}
else
{
XmlSerializer xs = new XmlSerializer(typeof(TT));
xs.Serialize(stream, obj);
}
// be aware that the Unicode Byte-Order Mark will be at the front of the string
return stream.ToArray().ToUtfString();
}
internal string SerializeToString<TT>(object obj)
{
StringBuilder builder = new StringBuilder();
XmlWriter xmlWriter = XmlWriter.Create(builder);
if (m_bDCS)
{
DataContractSerializer dc = new DataContractSerializer(typeof(TT));
dc.WriteObject(xmlWriter, obj);
}
else
{
XmlSerializer xs = new XmlSerializer(typeof(TT));
xs.Serialize(xmlWriter, obj);
}
string xml = builder.ToString();
xml = RegexHelper.ReplacePattern(xml, RegexHelper.WildcardToPattern("<?xml*>", WildcardSearch.Anywhere), string.Empty);
xml = RegexHelper.ReplacePattern(xml, RegexHelper.WildcardToPattern(" xmlns:*\"*\"", WildcardSearch.Anywhere), string.Empty);
xml = xml.Replace(Environment.NewLine + " ", string.Empty);
xml = xml.Replace(Environment.NewLine, string.Empty);
return xml;
}
}
}
This is a guess, but I think it is running slow in debug mode because for every exception, it is performing some actions to show the exception in the debug window, etc. If you are running in release mode, these extra steps are not taken.
I've never done this, so I really don't know id it would work, but have you tried just setting that one assembly to run in release mode while all others are set to debug? If I'm right, it may solve your problem. If I'm wrong, then you only waste 1 or 2 minutes.
About your debugging problem, have you tried to disable the exception assistant ? (Tools > Options > Debugging > Enable the exception assistant).
Another point should be the exception handling in Debug > Exceptions : you can disable the user-unhandled stuff for the CLR or only uncheck the System.FormatException exception.
Ok - I figured out the root issue. It was what I alluded to in the EDIT to the main question. The problem was that in the xml, it was correctly serializing doubles that had a value of double.NaN. I was using these values to indicate "na" for when the denominator was 0D. Example: ROE (Return on Equity = Net Income / Average Equity) when Average Equity is 0D would be serialized as:
<ROE>NaN</ROE>
When the DCS tried to de-serialize it, evidently it first tries to read the number and then catches the exception when that fails and then handles the NaN. The problem is that this seems to generate a lot of overhead when in DEBUG mode.
Solution: I changed the property to double? and set it to null instead of NaN. Everything now happens instantly in DEBUG mode now. Thanks to all for your help.
Try disabling some IE addons. In my case, the LastPass toolbar killed my Silverlight debugging. My computer would freeze for minutes each time I interacted with Visual Studio after a breakpoint.