Unable to Bind ListBox to IEnumerable<object> - wpf

Question

This is the first time I'm working with List
Here is my code (Removed all the unwanted lines for simplification)
Class1
public class RInfo
{
public int RCode { get; set; }
public int ACode { get; set; }
public int DCode { get; set; }
public string RNo { get; set; }
//public DateTime EDate { get; set; }
//public DateTime? VDate { get; set; }
}
Class 2
public class DInfo
{
public int DCode { get; set; }
public string DName { get; set; }
public bool DCExpires { get; set; }
}
Class that I will get after joining above two classes
public class RInfo_Details
{
public int RCode { get; set; }
public int ACode { get; set; }
public int DCode { get; set; }
public string DCName { get; set; }
public string DName { get; set; }
public string RNo { get; set; }
//public DateTime EDate { get; set; }
//public DateTime? VDate { get; set; }
}
Here is my class this is used to retrive data and for binding in XAML
public class AppData : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected void RaisePropertyChanged(string propertyName) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
private AppData() { }
private static AppData instance = null;
public static AppData Instance
{
get
{
if (instance == null) instance = new AppData();
return instance;
}
}
AInfo _SelAInfo;
public AInfo SelAInfo
{
get => _SelAInfo; set
{
_SelAInfo = value; RaisePropertyChanged(nameof(SelAInfo));
RaisePropertyChanged(nameof(RInfo_List));
RaisePropertyChanged(nameof(RInfoDetailedList));
}
}
List<DInfo> _DInfo;
public List<DInfo> DInfo { get => _DInfo; set { _DInfo = value; RaisePropertyChanged(nameof(DInfo)); } }
List<RInfo> _RInfo;
public List<RInfo> RInfo { get => _RInfo; set { _RInfo = value; RaisePropertyChanged(nameof(RInfo)); RaisePropertyChanged(nameof(RInfoDetailedList)); } }
public IEnumerable<RInfo_Details> RInfoDetailedList
{
get
{
IEnumerable<RInfo_Details> newlist = (from r in RInfo
join d in DInfo
on r.DCode equals d.DCode
select new
{
r.RCode,
r.ACode,
r.DCode,
d.DName,
d.DCExpires,
r.RNo,
}).ToList() as IEnumerable<RInfo_Details>;
return newlist as IEnumerable<RInfo_Details>;
}
}
public void iniTestData()
{
this.DInfo = new List<DInfo>()
{
new DInfo{DCode=1, DCExpires=false, DName="PAN" },
new DInfo{DCode=2, DCExpires=true, DName="FSSAI" },
new DInfo{DCode=3, DCExpires=false, DName="AANDAHR" }
};
this.RInfo = new List<RInfo>()
{
new RInfo{RCode=1, ACode=1, DCode=1, RNo="PAN NO ACode 1" },
new RInfo{RCode=2, ACode=2, DCode=1, RNo="PAN NO ACode 2" },
new RInfo{RCode=3, ACode=5, DCode=3, RNo="AADHAR ACode 5" },
new RInfo{RCode=4, ACode=4, DCode=1, RNo="PAN NO ACode 4" }
};
}
}
Here is code in XAML that is binding AppData.RInfoDetailedList
<ListView ItemsSource="{Binding Source={x:Static local:AppData.Instance}, Path=RInfoDetailedList}">
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Label Grid.Column="0" Content="{Binding RNo}"/>
<Label Grid.Column="1" Content="{Binding DName}"/>
<Label Grid.Column="2" Content="{Binding DCExpires }"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Data from RInfo & DInfo Binds succesfully. but from RInfoDetailedList does not bind.
What is that I'm missing

Answer 1

This is because RInfoDetailedList is returning null due to the wrong cast!
You can create the RInfo_Details object in the select statement like this
public IEnumerable<RInfo_Details> RInfoDetailedList
{
get
{
if (RInfo == null || DInfo == null) return null;
var newList = from r in RInfo
join d in DInfo
on r.DCode equals d.DCode
select new RInfo_Details {
RCode = r.RCode,
ACode = r.ACode,
DCode = r.DCode,
DName = d.DName,
RNo = r.RNo,
};
return newList;
}
}