Question

我有一个执行 IConfirmNavigation Request 和的查看模型, 执行 IConfirmurationNavigation Request 和 http://msdn.microsoft.com/en-us/library/gg430861%28v=pandp.40%%29.aspx#sec10" rel="nofollow"。我需要将这个查看模型的信息传送到一个我拥有的导航中介类, 与任何特定的观点或查看模型无关。

相反,导航代理商类可以访问感兴趣的IRegion 以及IRegion Navigation Service 。

ViewModel Adding Parameters to Uri

    public override void ConfirmNavigationRequest(NavigationContext navigationContext,
                                                  Action<bool> continuationCallback)
    {
        _verificationCount++;
        navigationContext.Parameters.Add("Count", _verificationCount.ToString());
        continuationCallback(Verify());
    }

A Navigation Broker that Needs To Access the Passed Parameters

    // Some method
    _region.RequestNavigate(new Uri(_nextView, UriKind.Relative), NavigationCallback);

    private void NavigationCallback(NavigationResult navigationResult)
    {            
        if (navigationResult.Error == null)
        {
            if (navigationResult.Result == true)
            {
                // Need to evaluate the Count argument here
                // int count = ...
                // if (count < 5)
                QueueNextView();                     
            } else
            {
                Debug.WriteLine("Navigation Cancelled");
            }
        }
        else
        {
             Debug.WriteLine("Navigation Error");                
        }
    }

How to Access Parameter Through Region or NavigationService, Outside ViewModel?

I cannot find a way to access NavigationContext through NavigationService or Region?
I also tried this _region.NavigationService.Journal.CurrentEntry.Uri.OriginalString but it did not show any query information, just the registered View string name

Answer 1

Agustin Adami :

navigationResult.Context.Parameters["Count"];

ViewModel Adding Parameters to Uri

A Navigation Broker that Needs To Access the Passed Parameters

How to Access Parameter Through Region or NavigationService, Outside ViewModel?

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