我试图创建WPF应用程序以下MVVM模式everithing是好的，直到我开始绑定命令更改数据。我不明白为什么后，命令执行信息在我的列表框不更新。
下面是我的ViewModel：

class FirstVM : ObservableObject
{
    private ObservableCollection<DetailScheme> _detailsScheme;
    private string _text;
    private ObservableCollection<Material> _materials;
    private ObservableCollection<Detail> _detail;

    public string Text
    {
        get { return _text; }
        set
        {
            _text = value;
            OnPropertyChanged();
        }
    }
    public ObservableCollection<DetailScheme> DetailScheme 
    { 
        get { return _detailsScheme; } 
    }
    
    public ObservableCollection<Material> Materials 
    {
        get { return _materials; } 
        set { 
                _materials = value;
                OnPropertyChanged();
            }
    }
    public ObservableCollection<Detail> Details 
    { 
        get { return _detail; } 
        set { 
                _detail = value; 
                OnPropertyChanged(); 
            }
    }
    public RelayCommand ProduceCommand { get; set; }

    public FirstVM () 
    {
        _detailsScheme = GetDetailsScheme("D:/ DetailsScheme.json");
        _materials = GetMaterials("D:/ Materials.json");
        _detail = GetDetails("D:/ Details.json");
        ProduceCommand = new RelayCommand(o => 
        {
                        //this method return new ObservableCollection
            Materials = GetMaterialsAfterNormalBatch(Materials, (o as DetailScheme).Materials);
                Text = Materials[0].ToString();
        });
        
    }

字符串
材料类别：

class Material : ObservableObject
    {
        private string _name;
        private int _amount;
    
        public int Amount { 
            get { return _amount; }
            set { 
                    _amount = value;
                    OnPropertyChanged();
                }  
            }
    
        public string Name { 
            get { return _name; }
            set { _name = value; }
        }
    
        public Material(string name, int amount)
        {
            _name = name;
            _amount = amount;
        }
        
        public static ObservableCollection<Material> GetMaterials(string path)
        {
            ObservableCollection<Material> materials;
            using (StreamReader sr = new StreamReader(path))
            {
                materials = JsonConvert.DeserializeObject<ObservableCollection<Material>>(sr.ReadToEnd());
            }
            return materials;
        }
        public static ObservableCollection <Material> GetMaterialsAfterNormalBatch(ObservableCollection<Material> allMaterials, ObservableCollection<Material> requiredMaterials)
        {
            for (int i = 0; i < allMaterials.Count; i++)
                for (int j = 0; j < requiredMaterials.Count; j++)
                    if (allMaterials[i].Name == requiredMaterials[j].Name)
                        allMaterials[i].Amount -= requiredMaterials[j].Amount;
            return allMaterials;
        }
        public override string ToString()
        {
            return Name+$" : {Amount}";
        }
    }

型
和视图：

<UserControl x:Class="Storage_Manager.MVVM.View.Task_1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Storage_Manager.MVVM.View"
             xmlns:VM="clr-namespace:Storage_Manager.MVVM.ViewModel"
             xmlns:View="clr-namespace:Storage_Manager.MVVM.View"
             mc:Ignorable="d" 
             d:DesignHeight="515" d:DesignWidth="700">
        <UserControl.DataContext>
            <VM:FirstVM/>
        </UserControl.DataContext>
        <Grid>
            <ComboBox x:Name="BoxOfDetails"
                      Height="50" 
                      Width="250"  
                      SelectedIndex="0"
                      Margin="10,10,440,455"
                      ItemsSource="{Binding DetailScheme}">
                <ComboBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel>
                            <TextBlock Text="{Binding Name}" FontSize="18" />
                            <TextBlock Text="{Binding }" FontSize="9" Margin="0,7,0,0"/>
                        </StackPanel>
                    </DataTemplate>
                </ComboBox.ItemTemplate>
            </ComboBox>
            <Button Content ="Produce"
                    Width="200"
                    Margin="60,460,440,10"
                    Command="{Binding ProduceCommand}"
                    CommandParameter="{Binding ElementName=BoxOfDetails, Path=SelectedItem}"/>
            <ListBox ItemsSource="{Binding Materials}" 
                     Background="Transparent" 
                     Foreground="white"
                     BorderThickness="0"
                     IsHitTestVisible="False"/>
            <TextBlock Foreground="DarkGray"
               Text="{Binding Text}"/>
        </Grid>
    </UserControl>

型
我添加了TextBlock来查看单击按钮后信息是否更新，是的，每次单击后TextBlock数据都会更改，但ListBox保持不变。Material类实现了INotifyPropertyChanged。