Wpf ICollectionView 绑定项无法解析类型对象的属性

使用 WPF 的开发人员都知道，ICollectionView 是一种非常有用的界面控制器，它允许我们对集合数据进行排序、过滤和分组。然而，有时候我们会遇到一种情况，就是无法解析绑定项的某个属性，这给我们带来了很多困扰。本文将介绍这个问题，并提供一些解决方案。

csharp
public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}
public class MainViewModel
{
    public ICollectionView People { get; set; }
    public MainViewModel()
    {
        List people = new List
        {
            new Person { Name = "Alice", Age = 25 },
            new Person { Name = "Bob", Age = 30 },
            new Person { Name = "Charlie", Age = 20 }
        };
        People = CollectionViewSource.GetDefaultView(people);
        People.SortDescriptions.Add(new SortDescription("Age", ListSortDirection.Ascending));
    }
}

xaml
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfCollectionViewExample"
        Title="MainWindow" Height="450" Width="800">
    
        
    
    
        
            
                
                    
                    
                
            
        
    

csharp
public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
    public int Length => Name.Length;
}

csharp
People.SortDescriptions.Add(new SortDescription("Length", ListSortDirection.Ascending));

csharp
public class NameLengthComparer : IComparer
{
    public int Compare(object x, object y)
    {
        if (x is Person personX && y is Person personY)
        {
            return personX.Length.CompareTo(personY.Length);
        }
        return 0;
    }
}

csharp
CollectionViewSource collectionViewSource = new CollectionViewSource();
collectionViewSource.Source = people;
collectionViewSource.SortDescriptions.Add(new SortDescription("Length", ListSortDirection.Ascending));
collectionViewSource.SortDescriptions.Add(new SortDescription(string.Empty, ListSortDirection.Ascending));
collectionViewSource.CustomSort = new NameLengthComparer();
People = collectionViewSource.View;

csharp
public class DynamicPerson : DynamicObject
{
    private readonly Person _person;
    public DynamicPerson(Person person)
    {
        _person = person;
    }
    public override bool TryGetMember(GetMemberBinder binder, out object result)
    {
        switch (binder.Name)
        {
            case "Name":
                result = _person.Name;
                return true;
            case "Age":
                result = _person.Age;
                return true;
            case "Length":
                result = _person.Name.Length;
                return true;
            default:
                result = null;
                return false;
        }
    }
}

csharp
List dynamicPeople = people.Select(person => new DynamicPerson(person)).ToList();
People = CollectionViewSource.GetDefaultView(dynamicPeople);
People.SortDescriptions.Add(new SortDescription("Length", ListSortDirection.Ascending));