I am using Cimbalino navigation but the query param never gets set for me.
Main View Model
private readonly INavigationService navigationService = null;
public MainViewModel(INavigationService navigationService)
{
this.navigationService = navigationService;
NavigateToPg2Cmd = new RelayCommand(() => NaviagateToPg2());
NavigateToPg2WithParmsCmd = new RelayCommand(() => NaviagateToPg2WithParms());
}
private void NaviagateToPg2WithParms()
{
navigationService.NavigateTo(new Uri("/Views/SecondPg.xaml?parameter=1&parm2=2", UriKind.Relative));
}
When I look into NavigationService the Query Param dictionary is always 0.
static ViewModelLocator()
{
ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
if (ViewModelBase.IsInDesignModeStatic)
{
}
else
{
}
SimpleIoc.Default.Register<INavigationService, NavigationService>();
SimpleIoc.Default.Register<MainViewModel>();
SimpleIoc.Default.Register<SecondVM>();
}
Edit
Ok, I figured it out. When NavigateTo runs it still has not split the query string out yet so that's why it is zero.
I was also trying to do
private readonly INavigationService navigationService = null;
public SecondVM(INavigationService navigationService)
{
this.navigationService = navigationService;
if (IsInDesignMode)
{
Message = "Design Mode";
}
else
{
if (navigationService.QueryString.ContainsKey("paramter"))
{
Message = navigationService.QueryString["parameter"];
}
}
}
what did not work either as I guess it was too early as well. I really would like to pull it out at constructor time though, is there a way to do this?
I know it's not 100% the solution you are looking for, but you are true... You'll need to wait until the view is loaded before accessing the QueryString params in the ViewModel!
To do this, hook into the Loaded event of the view and pass it to a Command on the viewmodel!
If created a demo of this on my github to get you started: https://github.com/Depechie/NavigationParams
Related
I've implemented an IMvxNavigationFacade for deep linking in my MvvmCross 5.6.x sample app. I've added logic in BuildViewModelRequest() to construct a MvxViewModelRequest with parameters passed in as MvxBundle.
if (url.StartsWith("http://www.rseg.net/rewards/"))
{
var parametersBundle = new MvxBundle();
var id = url.Substring(url.LastIndexOf('/') + 1);
parametersBundle.Data.Add("id", id);
return Task.FromResult(
new MvxViewModelRequest(typeof(RewardDetailViewModel),
parametersBundle, null));
}
However, this approach causes the old style Init() method to be called in the target ViewModel rather than the new typesafe Prepare() method.
public class RewardDetailViewModel :
MvxViewModel<RewardDetailViewModel.Parameteres>
{
...
public new void Init(string id)
{
if (!string.IsNullOrWhiteSpace(id))
{
if (int.TryParse(id, out _rewardId))
RaiseAllPropertiesChanged();
}
}
public override void Prepare(Parameteres parameter)
{
if (parameter != null)
{
_rewardId = parameter.RewardId;
RaiseAllPropertiesChanged();
}
}
}
Is there a way to construct a MvxViewModelRequest so that you pass in an instance of the parameter class for the target ViewModel causing the Prepare() method to be called?
The entire solution can be viewed on GitHub https://github.com/rsegtx/So.MvvmNav2
Thanks in advance!
After doing some research I found at lease one way to accomplish this.
Create a ViewModelInstanceRequest rather than a ViewModelRequest so that you can call ViewModelLoader.LoadViewModel passing in a parameters object; the ViewModelRequest only allows parameters to be passed using a MvxBundle. Make the following change to BuildViewModelRequest() on the NavigationFacade:
var request = new
MvxViewModelInstanceRequest(typeof(RewardDetailViewModel));
var parameters = new RewardDetailViewModel.Parameteres();
.... parse parameters and fill in parameters object
request.ViewModelInstance = ViewModelLoader.LoadViewModel(
request, parameters, null);
return Task.FromResult((MvxViewModelRequest)request);
Create your own IMvxNavigationService and add logic to inspect the object returned from the NavigationFacde and if it is a ViewModelInstanceRequest then use it as is rather than one previously creating.
var facadeRequest = await facade.BuildViewModelRequest(path,
paramDict).ConfigureAwait(false);
...
if (facadeRequest is MvxViewModelInstanceRequest)
request = facadeRequest as MvxViewModelInstanceRequest;
else
{
facadeRequest.ViewModelType = facadeRequest.ViewModelType;
if (facadeRequest.ParameterValues != null)
{
request.ParameterValues = facadeRequest.ParameterValues;
}
request.ViewModelInstance = ViewModelLoader.LoadViewModel(
request, null);
}
I've updated the original example on GitHub https://github.com/rsegtx/So.MvvmNav2.
Although I'm relatively new to AutoMapper I'm using it in a small project I'm developing. I've never had problems using it before but now I'm facing some weird behavior passing parameters to a Custom Resolver.
Here's the scenario: I get a list of messages from my repository and then map those to a frontend friendly version of it. Nothing fancy, just some normal mapping between objects. I have a field in that frontend object that tells if a certain user already voted for that message and that's what I'm using the Custom Resolver for (it's that second "ForMember"):
public List<SupportMessageUi> GetAllVisible(string userId)
{
Mapper.CreateMap<SupportMessage, SupportMessageUi>()
.ForMember(dest => dest.Votes,
opt => opt.ResolveUsing<SupportMessageVotesResolver>())
.ForMember(dest => dest.UserVoted,
opt => opt.ResolveUsing<SupportMessagesUserVotedResolver>()
.ConstructedBy(() => new SupportMessagesUserVotedResolver(userId)));
var messages = _unitOfWork.MessagesRepository.Get(m => m.Visible);
var messagesUi = Mapper.Map<List<SupportMessageUi>>(messages);
return messagesUi;
}
I'm calling this method on a web service and the problem is: the first time I call the webservice (using the webservice console) it all runs perfectly. For example, if I pass '555' as the userId I get to this method with the correct value:
And in the Custom Resolver the value was correctly passed to the constructor:
The results returned are correct. The problem comes next. The second time I call the service, passing a different argument ('666' this time) the argument that gets to the constructor of the Custom Resolver is the old one ('555'). Here's what I mean:
Right before mapping the objects we can see that the value passed to the constructor was correct ('666'):
But when it gets to the constructor of the Resolver the value is wrong, and is the old one ('555'):
All subsequent calls to the service use the original value in the Custom Resolver constructor ('555'), independently of the value I pass to the service (also happens if I make the call from another browser). If I shut down the server and relaunch it I can pass a new parameter (that will be used in all other calls until I shut it down again).
Any idea on why this is happening?
It's happening because AutoMapper.CreateMap is a static method, and only needs to be called once. With the CreateMap code in your web method, you're trying to call it every time you call that method on your web service. Since the web server process stays alive between calls (unless you restart it, like you said) then the static mappings stay in place. Hence, the necessity of calling AutoMapper.Reset, as you said in your answer.
But it's recommended that you put your mapping creation in AppStart or Global or a static constructor or whatever, so you only call it once. There are ways to call Map that allow you to pass in values, so you don't need to try to finesse things with the constructor of your ValueResolver.
Here's an example using a ValueResolver (note the change to implementing IValueResolver instead of inheriting ValueResolver<TSource, TDestination>):
[Test]
public void ValueTranslator_ExtraMapParameters()
{
const int multiplier = 2;
ValueTranslator translator = new ValueTranslator();
Mapper.AssertConfigurationIsValid();
ValueSource source = new ValueSource { Value = 4 };
ValueDest dest = translator.Translate(source, multiplier);
Assert.That(dest.Value, Is.EqualTo(8));
source = new ValueSource { Value = 5 };
dest = translator.Translate(source, multiplier);
Assert.That(dest.Value, Is.EqualTo(10));
}
private class ValueTranslator
{
static ValueTranslator()
{
Mapper.CreateMap<ValueSource, ValueDest>()
.ForMember(dest => dest.Value, opt => opt.ResolveUsing<ValueResolver>().FromMember(src => src.Value));
}
public ValueDest Translate(ValueSource source, int multiplier)
{
return Mapper.Map<ValueDest>(source, opt => opt.Items.Add("multiplier", multiplier));
}
private class ValueResolver : IValueResolver
{
public ResolutionResult Resolve(ResolutionResult source)
{
return source.New((int)source.Value * (int)source.Context.Options.Items["multiplier"]);
}
}
}
private class ValueSource { public int Value { get; set; } }
private class ValueDest { public int Value { get; set; } }
And here's an example using a TypeConverter:
[Test]
public void TypeTranslator_ExtraMapParameters()
{
const int multiplier = 3;
TypeTranslator translator = new TypeTranslator();
Mapper.AssertConfigurationIsValid();
TypeSource source = new TypeSource { Value = 10 };
TypeDest dest = translator.Translate(source, multiplier);
Assert.That(dest.Value, Is.EqualTo(30));
source = new TypeSource { Value = 15 };
dest = translator.Translate(source, multiplier);
Assert.That(dest.Value, Is.EqualTo(45));
}
private class TypeTranslator
{
static TypeTranslator()
{
Mapper.CreateMap<TypeSource, TypeDest>()
.ConvertUsing<TypeConverter>();
}
public TypeDest Translate(TypeSource source, int multiplier)
{
return Mapper.Map<TypeDest>(source, opt => opt.Items.Add("multiplier", multiplier));
}
private class TypeConverter : ITypeConverter<TypeSource, TypeDest>
{
public TypeDest Convert(ResolutionContext context)
{
TypeSource source = (TypeSource)context.SourceValue;
int multiplier = (int)context.Options.Items["multiplier"];
return new TypeDest { Value = source.Value * multiplier };
}
}
}
private class TypeSource { public int Value { get; set; } }
private class TypeDest { public int Value { get; set; } }
Answering myself: I was not using AutoMapper.Reset(). Once I did that everything started working properly.
Helpful reading: http://www.markhneedham.com/blog/2010/01/27/automapper-dont-forget-mapper-reset-at-the-start/
i am trying to share an image. I got a picture object and am getting the path from it. When I'm calling the ShareMediaTask it throw following error:
System.Windows.Media.ImageSource cannot be serialized.
I am still able to share the image, but the app crashes when returning from sharing.
Here is my code:
PictureModel picture = Singleton.Instance.BearPicture.Model.Images.Where(PictureModel => PictureModel.Bmp.UriSource == (Image_View.Source as BitmapImage).UriSource).FirstOrDefault();
var task = new ShareMediaTask();
task.FilePath = picture.Picture.GetPath();
task.Show();
My PictureModel looks like this:
public class PictureModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string _uri;
public string Uri
{
get { return _uri; }
set
{
if (value != _uri)
{
_uri = value;
NotifyPropertyChanged("Uri");
}
}
}
private string _relativePath;
public string RelativePath
{
get { return _relativePath; }
set
{
if (_relativePath != value)
{
_relativePath = value;
NotifyPropertyChanged("RelativePath");
}
}
}
private BitmapImage _bmp;
public BitmapImage Bmp
{
get { return _bmp; }
set
{
if (value != _bmp)
{
_bmp = value;
NotifyPropertyChanged("Bmp");
}
}
}
private Picture _picture;
public Picture Picture
{
get { return _picture; }
set
{
if (value != _picture)
{
_picture = value;
NotifyPropertyChanged("Picture");
}
}
}
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
Where does this error come from? I am only getting the Source of my image object but i am not doing anything else with it. My picture is also saved in the media library like this:
myFileStream = myStore.OpenFile(fileName, FileMode.Open, FileAccess.Read);
MediaLibrary library = new MediaLibrary();
Picture pic = library.SavePicture(fileName, myFileStream);
On Appstart im searching through my savedpicture folder, to get the picture object, which is then saved in my PictureModel.
Any help is appreciated.
Thanks in advance.
robidd
This may help: Crashes Back (WriteableBitmap cannot be serialized) windows phone 8. See the comment from KooKiz.
"Same symptoms, same cause. You've stored at some point an ImageSource in the phone state (probably PhoneApplicationService.Current.State or IsolatedStorageSettings.ApplicationSettings). You have to find where!"
Apparently we can cause this error indirectly. I'm having a similar problem and I found that answer and also your own question.
Hope it helps.
Cheers.
Is it possible to use a simple action method - just like with Caliburn.Micro - instead of a command with MvvmCross bindings?
Example:
public void Action()
{
Tip = 11;
}
<Button
android:text="Button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/button1"
local:MvxBind="Click Action" />
It doesn't work out of the box, I tested that.
While I found a lot of samples about adding new target bindings, I didn't find a single one about adding a new source binding.
UPDATE:
This works now out of the box with the Rio binding. To use it, add the MvvmCross MethodBinding NuGet package to the Android project.
Up until now, much of the emphasis for MvvmCross has been on allowing multi-platform target binding with the source remaining mainly 'vanilla' INotifyPropertyChanged.
There have been some deviation in terms of ViewModel structure - e.g.:
the MvxCommandCollection - http://slodge.blogspot.co.uk/2013/03/fixing-mvvm-commands-making-hot-tuna.html
some users using Fody - http://twincoders.com/blog/codigo-limpio-con-fody/
Recently, several new feature requests have also been logged in this area:
AutoCommands - I think this is what you are asking about here - https://github.com/slodge/MvvmCross/issues/301
Rio binding sources - https://github.com/slodge/MvvmCross/issues/299
Tibet binding - https://github.com/slodge/MvvmCross/issues/298
Because of these, I do expect more functionality to be exposed in this area in the future...
With that said, if you wanted to get this working today, then MvvmCross Binding is overrideable so you could fairly easily do it:
1. Implement an ICommand that invokes a MethodInfo using reflection (for completeness this should probably also use a parameter if available) - some kind of InvokeMethodCommand (code for this left to the reader!)
.
2. Implement an MyMethodSourceBinding class which wraps the InvokeMethodCommand - something like:
public class MyMethodSourceBinding : MvxSourceBinding
{
private readonly MethodInfo _methodInfo;
protected MyMethodSourceBinding(object source, MethodInfo methodInfo)
: base(source)
{
_methodInfo = _methodInfo;
}
public override void SetValue(object value)
{
// do nothing - not allowed
}
public override Type SourceType
{
get { return typeof(ICommand); }
}
public override bool TryGetValue(out object value)
{
value = new InvokeMethodCommand(source, _methodInfo);
return true;
}
}
3. Override MvvmCross's registered IMvxSourceBindingFactory with your own implementation that can detect when a method is present - sadly most of this is cut and paste coding today - it would be something like
public class MySourceBindingFactory
: IMvxSourceBindingFactory
{
private IMvxSourcePropertyPathParser _propertyPathParser;
private IMvxSourcePropertyPathParser SourcePropertyPathParser
{
get
{
if (_propertyPathParser == null)
{
_propertyPathParser = Mvx.Resolve<IMvxSourcePropertyPathParser>();
}
return _propertyPathParser;
}
}
public IMvxSourceBinding CreateBinding(object source, string combinedPropertyName)
{
var tokens = SourcePropertyPathParser.Parse(combinedPropertyName);
return CreateBinding(source, tokens);
}
public IMvxSourceBinding CreateBinding(object source, IList<MvxPropertyToken> tokens)
{
if (tokens == null || tokens.Count == 0)
{
throw new MvxException("empty token list passed to CreateBinding");
}
var currentToken = tokens[0];
if (tokens.Count == 1)
{
return CreateLeafBinding(source, currentToken);
}
else
{
var remainingTokens = tokens.Skip(1).ToList();
return CreateChainedBinding(source, currentToken, remainingTokens);
}
}
private static MvxChainedSourceBinding CreateChainedBinding(object source, MvxPropertyToken propertyToken,
List<MvxPropertyToken> remainingTokens)
{
if (propertyToken is MvxIndexerPropertyToken)
{
return new MvxIndexerChainedSourceBinding(source, (MvxIndexerPropertyToken) propertyToken,
remainingTokens);
}
else if (propertyToken is MvxPropertyNamePropertyToken)
{
return new MvxSimpleChainedSourceBinding(source, (MvxPropertyNamePropertyToken) propertyToken,
remainingTokens);
}
throw new MvxException("Unexpected property chaining - seen token type {0}",
propertyToken.GetType().FullName);
}
private static IMvxSourceBinding CreateLeafBinding(object source, MvxPropertyToken propertyToken)
{
if (propertyToken is MvxIndexerPropertyToken)
{
return new MvxIndexerLeafPropertyInfoSourceBinding(source, (MvxIndexerPropertyToken) propertyToken);
}
else if (propertyToken is MvxPropertyNamePropertyToken)
{
//**************************
// Special code is here
var propertyToken = (MvxPropertyNamePropertyToken) propertyToken;
if (source != null)
{
var method = source.GetType().GetMethod(propertyToken.PropertyName, BindingFlags.FlattenHierarchy | BindingFlags.Public | BindingFlags.Instance);
if (method != null)
{
return new MyMethodSourceBinding(source, method);
}
}
return new MvxSimpleLeafPropertyInfoSourceBinding(source,
(MvxPropertyNamePropertyToken) propertyToken);
// Special code ends here
//**************************
}
else if (propertyToken is MvxEmptyPropertyToken)
{
return new MvxDirectToSourceBinding(source);
}
throw new MvxException("Unexpected property source - seen token type {0}", propertyToken.GetType().FullName);
}
}
4. Supply this source binding factory in your own custom binding builder - e.g.:
public class MyAndroidBindingBuilder
: MvxAndroidBindingBuilder
{
protected override IMvxSourceBindingFactory CreateSourceBindingFactory()
{
return new MvxSourceBindingFactory();
}
}
5. Supply this binding builder during your setup
public class Setup : MvxAndroidSetup
{
// ....
protected override MvxAndroidBindingBuilder CreateBindingBuilder()
{
return new MyAndroidBindingBuilder();
}
}
Note: This approach is only for advanced users right now... As suggested in the first part of this question, I do expect the code in this area to change quite a lot so you might also encounter some issues maintaining a fork in this area. (Indeed the code in this area has already changed quite significantly on the Tibet Binding branch within the GitHub repo!)
I am trying to understand the way the AsyncToken works in actionscript. How can I call a remote service and ensure that a specific parameter is available in the result or fault event functions? I think it is the async functionality I want to use.
The following code will hopefully explain what I am trying to do. Feel free to modify the code block as your explanation.
Thanks.
public function testSerivceCall(data:Object, callBackCommand:String):void
{
// Assume callBackCommand == "FOO";
// How can I pass in callBackCommand as a parameter to the result or fault events?
// How do I create an async token here?
var remoteObject:RemoteObject;
remoteObject = new RemoteObject();
remoteObject.destination = "zend";
remoteObject.source = "MyService";
remoteObject.endpoint = "http://example.com/service";
remoteObject.test.addEventListener(ResultEvent.RESULT, _handleTestResult);
remoteObject.test.addEventListener(FaultEvent.FAULT, _handleTestFault);
remoteObject.test(data);
}
private function _handleTestResult( event:ResultEvent ) : void
{
// How do I get the async token value?
// How can I get the value of callBackCommand in this code block?
if (callBackCommand == "FOO")
{
// do something related to "FOO"
}
else
{
// do something else with the result event
}
}
private function _handleTestFault( event:FaultEvent ) : void
{
// How do I get the async token value?
// How can I get the value of callBackCommand in this code block?
}
An edit to make this question more clear:
Assume I make the following method call somewhere in my code:
testSerivceCall(personObject, "LoginCommand");
How do I get access to the actual string "LoginCommand" inside the _handleTestResult function block?
The reason I want to do this is because I want to dynamically call back certain functions and hand off the result data to specific commands that I know ahead of time when I am making the service call.
I am just having a time grokking the AsyncToken syntax and functionality.
I did not even need closures. I added a class as below which I called externally.
The call was like this:
public class MyClass
{
...
var adminServerRO:AdminServerRO = new AdminServerRO();
adminServerRO.testSerivceCall("FOO",cptyId);
}
public class AdminServerRO
{
private function extResult( event:ResultEvent, token:Object ) : void
{
//the token is now accessed from the paremeter
var tmp:String = "in here";
}
private function extFault( event:FaultEvent ) : void
{
var tmp:String = "in here";
}
public function testSerivceCall(callBackCommand:String, cptyId:String):void
{
var remoteObject:RemoteObject = new RemoteObject();
remoteObject.destination = "adminServer";
var token:AsyncToken = remoteObject.getCounterpartyLimitMonitorItemNode(cptyId);
token.addResponder(new AsyncResponder(extResult,extFault,cptyId));
}
}
While the accepted answer will accomplish what the original submitter wants it does not actually answer the question which was asked. An AsyncToken is created as a result of a remote method call and is accessible from the ResultEvent. Since AsyncToken is a dynamic class you can add whatever property to it that you want. The code below should demonstrate this:
public function testSerivceCall(data:Object, callBackCommand:String):void
{
var remoteObject:RemoteObject;
remoteObject = new RemoteObject();
remoteObject.destination = "zend";
remoteObject.source = "MyService";
remoteObject.endpoint = "http://example.com/service";
remoteObject.test.addEventListener(ResultEvent.RESULT, _handleTestResult);
remoteObject.test.addEventListener(FaultEvent.FAULT, _handleTestFault);
var token:AsyncToken = remoteObject.test(data);
token.callBackCommand = callBackCommand;
}
private function _handleTestResult( event:ResultEvent ) : void
{
if (event.token.callBackCommand == "FOO")
{
// do something related to "FOO"
}
else
{
// do something else with the result event
}
}
private function _handleTestFault( event:FaultEvent ) : void
{
//event.token.callBackCommand should be populated here too
}
If you want to access the properties used during the remote call (parameters to the call and/or AsycToken), you can make use of closures. Just define the result event handler inside the calling method as a closure. It can then access any variable in the calling function.
public function testSerivceCall(data:Object, callBackCommand:String):void
{
var _handleTestResult:Function = function( event:ResultEvent ) : void
{
// token is visible here now
if (callBackCommand == "FOO")
{
// do something related to "FOO"
}
else
{
// do something else with the result event
}
}
var remoteObject:RemoteObject;
remoteObject = new RemoteObject();
remoteObject.destination = "zend";
remoteObject.source = "MyService";
remoteObject.endpoint = "http://example.com/service";
remoteObject.test.addEventListener(ResultEvent.RESULT, _handleTestResult);
remoteObject.test.addEventListener(FaultEvent.FAULT, _handleTestFault);
var token = remoteObject.test(data);
}
If I'm reading your question correctly, you're trying to figure out how to access the actual data returned by the ResultEvent ?
If so, assuming you've made the call correctly and you've gotten data back in a format you're expecting:
private function _handleTestResult( event:ResultEvent ) : void
{
// you get the result from the result property on the event object
// edit: assuming the class Person exists with a property called name
// which has the value "John"
var person : Person = event.result as Person;
if (person.name == "John")
{
Alert.show("John: " + person.name);
}
else
{
Alert.show("Not John: " + person.name);
}
}
private function _handleTestFault( event:FaultEvent ) : void
{
// Maybe you know the type of the returned fault
var expectedFault : Object = event.fault as MyPredefinedType
if (expectedFault.myPredefinedTypesPredefinedMethod() == "BAR")
{
// something here
}
}
The ResultEvent has a property called result which will hold an instance of the object returned by the result (it might be the output of an XML file if using a web service, or a serialized object if using AMF, for example). This is what you want to access. Similarly, FaultEvent has a fault property that returns the fault information.
Edit: Changed code in _handleTestResult() in response to Gordon Potter's comment.