MVVMCross Data Binding not working - xamarin

Question

I have custom object in my ViewModel.
public MyObject PropertyName
{
get { return _propertyName; }
set
{
_propertyName = value;
RaisePropertyChanged(() => PropertyName);
}
}
I want to bind only one of its member to textview in my droid view. Found this link:
Bind data of custom object to TextView in MvvmCross
And I am doing exactly like this. local:MvxBind = "Text Myobject.ItsMember"
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="LabelCaption" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:textColor="#android:color/white"
local:MvxBind="Text Myobject.ItsMember" />
</RelativeLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>
Checked the casing etc. but binding isn't working and I cannot see the string value appearing on the screen while I can print it in the debug window.
Any clues where I may be going wrong?

Answer 1

I cannot reproduce your issue on my end.
I've tried with:
public class MyViewModel : MvxViewModel
{
private MyModel _model; // this is a class member variable or class member field
public MyModel Model // this is a class member property
{
get => _model;
set => SetProperty(ref _model, value);
}
public MyViewModel()
{
Model = new MyModel { Name = "Herp" };
}
}
public class MyModel : MvxNotifyPropertyChanged
{
private string _name;
public string Name
{
get => _name;
set => SetProperty(ref _name, value);
}
}
Then given that MyViewModel is DataContext I bind using:
local:MvxBind="Text Model.Name"
Works just fine.

Answer 2

You can't bind to a type. You need to bind to an instance of the type. In order for the binding to work the way you have it set in the AXML you need something like
public class MyType
{
private string _ItsMember;
public string ItsMember
{
get
{
return _ItsMember;
}
set
{
_ItsMember = value;
RaisePropertyChanged (()=>ItsMember);
}
}
}
private MyType _MyObject;
public MyType MyObject
{
get
{
return _MyObject;
}
set
{
_MyObject = value;
RaisePropertyChanged(()=>MyObject);
}
}
This arrangement will allow MyObject.ItsMember to resolve to a string property value. If your property is not a string value, you will have to implement a converter which is a whole 'nother subject.