Hi I am Using Prism 6 with unity. and navigation Similar to here
I want to change the number , shape and size of regions in my shell after user crosses a certain checks in my WPF app.for that I am using Data Template Selector in shell. 1. Left side in image shows my application layout initially. [DataTemplate1] 2 Right side in image shows my application layout after some authentication[DataTemplate2]. 3.In Shell.xaml.cs I am changing a flag(after authetication)and with help of Event aggregator, my Template selector returns proper template.[DataTemplate2] 4. Here when in oneModule I am Trying use region defined in my DataTemplate2 I am getting an Exception.(Which was otherwise working fine, without using templates in shell) IRegion mainContentRegion = this._regionManager.Regions[RegionNames.MainContentRegion];
An exception occurred while trying to create region objects. - The most likely causing exception was:'System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> Prism.Regions.Behaviors.RegionCreationException: An exception occurred while creating a region with name ''. The exception was: System.ArgumentNullException: Value cannot be null
Update1>> As i mentioned earlier I am using navigation sample provided here. here. when i debug it I found that just before navigation the region manager has few regoins in normal case
but in my case (after templating shell) the region manager collection is empty(enumeration yeilded no results) I believe i need to fix my region collection after templating shell my region manager region collection getting reset. I need advice someone who is expert in Prism.