Would it be possible to call SaveChanges in an async way with a ExecuteCompleted event?

Question

In the Query pipeline, it's pretty simple to retrieve a records explicitely async with an ExecuteCompleted event returning the result.

I just wrote a small blog post on how to do this: http://blog.pragmaswitch.com/?p=375

Now, I'm wondering if the same could be applied in the Save pipeline. So, calling the Savechanges in a async way on the dataworkspace and getting back something like a SaveChangesCompleted event.

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paul van bladel

Answer 1

No suggestions?

So, I would like something like this (just pseudo-code)

var submitOperation = ...DataWorkspace.CreateSubmitOperation(...°
 
submitOperation.ExecuteCompleted += new EventHandler<ExecuteCompletedEventArgs>((s, e) =>
            {
                //continue after saving...
             });
submitOperation.ExecuteAsync();

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paul van bladel

Answer 2

You're close, but what you need to do is get the SaveChanges method off of the details of the data service that you want to save and create an invocation of that method:

partial void SaveAsync_Execute()
{
    ISubmitOperationInvocation saveChangesInvocation = this.DataWorkspace.ApplicationData.Details.Methods.SaveChanges.CreateInvocation(new object[] { });
    saveChangesInvocation.ExecuteCompleted += this.SaveChangesInvocation_ExecuteCompleted;
    saveChangesInvocation.ExecuteAsync();
}

void SaveChangesInvocation_ExecuteCompleted(object sender, Microsoft.LightSwitch.ExecuteCompletedEventArgs e)
{
            
}

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Justin Anderson, LightSwitch Development Team

Answer 3

Hi Justin,

I just knew you would be the person to provide the missing link :)

Many thanks !

paul.

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paul van bladel