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Async command execution in MVVM light


Async command execution in MVVM light

By : user2951325
Date : November 18 2020, 01:01 AM
seems to work fine Probably because there are many different ways of doing it; I describe a few approaches in my MSDN article on the subject.
Asynchronous lifetime commands are especially tricky. Something like a "close" command must be carefully considered. Is there some indication that a close is in progress? What happens if the user closes more than once ("close" in particular can often be initiated by an OS or another app even if a "close button" is disabled)?
code :


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[WP7][MVVM Light toolkit] Button Command raised too early, before binding when using mvvm-light toolkit

[WP7][MVVM Light toolkit] Button Command raised too early, before binding when using mvvm-light toolkit


By : user2398912
Date : March 29 2020, 07:55 AM
like below fixes the issue It is possible that you have hit the TextBox DataBinding issue with the TextChanged event. This is a recognized problem in Silverlight 3, see this thread discussing this issue and the workaround. A neat solution is perhaps to use behaviors as discussed in this article.
HTH, indyfromoz
Async communication between ViewModel and Model using MVVM-Light messaging?

Async communication between ViewModel and Model using MVVM-Light messaging?


By : user2640905
Date : March 29 2020, 07:55 AM
I wish this helpful for you Are you sure you're making the request in the right place? Typically the Model contains simply the data that you want to store/transfer and the View Model would handle transforming that Model's properties so that a View can display (or edit) that Model. I would imagine that Model objects are what you're going to get back from the HttpWebRequest, and so you may want to consider using a Service class to handle retrieving the data, though that may be overkill for your application.
Either way, I'd highly reccomend that you handle the request and the parsing of the response in the same place; otherwise you are spreading the logic across multiple places, which is just going to get confusing and hard to maintain.
Why does async method block MVVM Light Relay Command

Why does async method block MVVM Light Relay Command


By : Wim Tuijl
Date : March 29 2020, 07:55 AM
this will help The await itself will not block your UI. It is more likely that your Upload() method does not do any real asynchronous work.
(As Jim suggested, Task.Run() can be used in such a case. It will use the thread pool to run the operation in the background. Generally speaking, for IO-bound operations like uploads/downloads you should check if your API supports asynchronous calls natively. If such an implementation exists, it may make more efficient use of system resources than using a thread.)
mvvm light async call in viewmodel constructor

mvvm light async call in viewmodel constructor


By : user77123
Date : March 29 2020, 07:55 AM
may help you . I have a "task notifier" type in my AsyncEx library that is essentially an INotifyPropertyChanged wrapper for Task. You can use it like this:
MVVM Light Call async method on property changed?

MVVM Light Call async method on property changed?


By : faten emad
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further The issue is here not how to run an async task unobserved, its what do you do with the exceptions. I say this because they might turn up when the task gets cleaned up.
Ideally, just show the next reader what they are getting. Since you are against the use of async void
code :
// running an async method unobserved 
Task.Run(async () =>
{
   try
   {
      await DoSomethingAsync();
   }
   catch (Exception e)
   {
       // Deal with unobserved exceptions 
       // or there will be dragons
   }  
});
public async void DoSomethingFireAndForget()
{
   try
   {
      await DoSomethingAsync();
   }
   catch (Exception e)
   {
      // Deal with unobserved exceptions 
      // or the will be dragons
   }  
}
public static class TaskUtils
{

#pragma warning disable RECS0165 // Asynchronous methods should return a Task instead of void
   public static async void FireAndForgetSafeAsync(this Task task,  Action<Exception> onErrors = null)
#pragma warning restore RECS0165 // Asynchronous methods should return a Task instead of void
   {
      try
      {
         await task;
      }
      catch (Exception ex)
      {
         onErrors?.Invoke(ex);
      }
   }
}
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