WPF DataGrid CustomSort for each Column

Question

I have a WPF DataGrid bound to a CollectionViewSource that encapsulates an ObservableCollection. This CollectionViewSource has two main objectives:

1) To group each

Answer 1

I've learned a lot from this question, and here I share a way of doing it.
This method does not modify xaml while conforming to mvvm.
I need to load the file path to DataGrid, which can be sorted like Windows Explorer.
there have some files:

E:\Test\Item_1.txt
E:\Test\Item_04.txt
E:\Test\Item_5.txt
E:\Test\Item_10.txt

Note that I have sorted by file name by Windows Explorer.
I think you've found that the file sort used by Explorer is not a simple string sort.
It uses the win32 api StrCmpLogicalW in shlwapi.dll
We need to implement the IComparable(Non-generic) interface for the sorted properties.
For less code, I used Prism.Mvvm.BindableBase, an INotifyPropertyChanged implementation.
Code like this:

    /// 

    /// Data Model
    /// 
    public class ListItemModel : BindableBase
    {

        private FilePath filePath;
        public FilePath FilePath
        {
            get { return filePath; }
            set { SetProperty(ref filePath, value); }
        }
        
        /// Other properties.
        /// ....
    }

    /// 

    /// wrapper of filepath
    /// 
    public class FilePath : IComparable
    {
        private string filePath;

        [DllImport("shlwapi.dll", CharSet = CharSet.Unicode)]
        private static extern int StrCmpLogicalW(string psz1, string psz2);

        public FilePath(string filePath)
        {
            this.filePath = filePath;
        }

        /// 

        /// Implicit type conversion.
        /// 
        /// 
        public static implicit operator string(FilePath x)
        {
            return x.filePath;
        }

        public static implicit operator FilePath(string x)
        {
            return new FilePath(x);
        }

        /// 

        /// override for datagrid display.
        /// 
        /// 
        public override string ToString()
        {
            return filePath;
        }

        /// 

        /// Implement the interface IComparable for Custom sorting.
        /// 
        /// 
        /// 
        public int CompareTo(object obj)
        {
            if (obj is FilePath other)
                return StrCmpLogicalW(filePath, other.filePath);
            return 1;
        }
    }

XAML code:

In summary, I encapsulated the original string properties,
You can also encapsulate your custom properties for sorting,
just override ToString for display and implemented CompareTo for sorting.