Binding single control to different Datacontext in wpf

Question

I have a button button_extract. I want to bind it to two different data contexts (2 classes in different namespaces)

I want to set the Command and IsEnabled properties to different data context.

I have one datacontext set for Command property. But how to I specify the datacontext of IsEnable property which is in different class and namespace. Here is the scenario:-

I have a project named Environments with three namespaces:Viewmodel,Data and View Viewmodel has class A Data has class B View has xaml C with button button_extract.

The data context for C is set to class A.The xaml is as follows

<UserControl x:Class="Enviornment.Views.C" DataContext="Environment.Viewmodel.A"> <Button Name="button_extract" Command="{Binding ExtractButtonClick}" IsEnabled="{Enviornment.B.SelectedEnvionment}" >Extract</Button>

The above code does not work. The binding of IsEnabled throws error. How can I set the datacontext of IsEnabled to that of Enviornment.B???

You can specify the full path for a Binding. Post your best attempt and the specific problems you are having with it. — nvoigt
– nvoigt, Commented Oct 9, 2014 at 6:20
By setting the "Path" part of the Binding. Post your best attempt so we canhelp you or read a good tutorial to find it out all by yourself. — nvoigt
– nvoigt, Commented Oct 9, 2014 at 6:24

Sheridan · Accepted Answer · 2014-10-09 08:09:31Z

You seem to have a common misconception about WPF regarding the need to set the DataContext. In fact, there is rarely any need to set a DataContext on any control as typically the Window has had its DataContext set and each control's DataContext will automatically inherit from that.

So, how to data bind to two different places? Generally, one place would use a normal Binding Path and the other would use a RelativeSource Binding Path. However, that would be more for the case where you wanted to data bind to properties of the set DataContext and properties of a control's code behind.

It is more common in your scenario to simply prepare a view model. That is a custom class that implements the INotifyPropertyChanged interface and provides all of the properties and functionality that your Window, UserControl, or 'view' requires. You would then set an instance of this single object as the DataContext.

Therefore, simply add properties of the relevant classes into your view model and then you will be able to access them all using the one single DataContext object. Please search online for MVVM for further information.

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