當綁定列表中的對象屬性發生變化時，datagrid單元格不會更新

Question

我有一個WPF應用程序，其中的ItemsSource是一個BindingList。當我對BindingList中的對象進行更改時，數據網格未被更新。當我修改BindingList中的對象時，如何確保datagrid更新？

這裏是XAML：

<DataGrid CanUserAddRows="False" AutoGenerateColumns="False" HorizontalAlignment="Stretch" Name="dgLocalPlugins" VerticalAlignment="Stretch" SelectionMode="Single" AlternatingRowBackground="#CDEBEBEB" Margin="5,85,5,143" Width="Auto" SelectionChanged="dgLocalPlugins_SelectionChanged"> 
    <DataGrid.Columns> 
     <DataGridCheckBoxColumn Header="Enabled" Binding="{Binding Path=Enabled}" Width="55" > 
      <DataGridCheckBoxColumn.CellStyle> 
       <Style> 
        <EventSetter Event="CheckBox.Checked" Handler="OnChecked"/> 
        <EventSetter Event="CheckBox.Unchecked" Handler="OnUnchecked"/> 
       </Style> 
      </DataGridCheckBoxColumn.CellStyle> 
     </DataGridCheckBoxColumn> 
     <DataGridTextColumn Header="Plugin" Binding="{Binding Path=Type}" IsReadOnly="True" Width="*" /> 
     <DataGridTextColumn Header="Status" Binding="{Binding Path=Status}" IsReadOnly="True" Width="*" /> 
    </DataGrid.Columns> 
</DataGrid> 

這裏是後面我填充其中的BindingList相關代碼：

private BindingList<PluginDescription> pluginList = new BindingList<PluginDescription>(); 

foreach (string path in osapdFiles) 
{ 
    if (!string.IsNullOrEmpty(path)) 
    { 
     PluginDescription desc = PluginHelper.Deserialize(path); 
     pluginList.Add(desc); 
    } 
} 

dgLocalPlugins.ItemsSource = pluginList; 

這裏是PluginDescription類：

public class PluginDescription : INotifyPropertyChanged 
{ 
    private string _pluginName; 
    public string Name 
    { 
     set 
     { 
      if (value != this._pluginName) 
      { 
       this._pluginName = value; 
       NotifyPropertyChanged("Name"); 
      } 
     } 
     get { return _pluginName; } 
    } 

    private string _pluginType; 
    public string Type 
    { 
     set 
     { 
      if (value != this._pluginType) 
      { 
       this._pluginType = value; 
       NotifyPropertyChanged("Type"); 
      } 
     } 
     get { return _pluginType; } 
    } 

    private string _pluginVersion; 
    public string Version 
    { 
     set 
     { 
      if (value != this._pluginVersion) 
      { 
       this._pluginVersion = value; 
       NotifyPropertyChanged("Version"); 
      } 
     } 
     get { return _pluginVersion; } 
    } 

    private string _pluginAuthor; 
    public string Author 
    { 
     set 
     { 
      if (value != this._pluginAuthor) 
      { 
       this._pluginAuthor = value; 
       NotifyPropertyChanged("Author"); 
      } 
     } 
     get { return _pluginAuthor; } 
    } 

    private string _wikiUrl; 
    public string WikiUrl 
    { 
     set 
     { 
      if (value != this._wikiUrl) 
      { 
       this._wikiUrl = value; 
       NotifyPropertyChanged("Wiki"); 
      } 
     } 
     get { return _wikiUrl; } 
    } 

    private string _description; 
    public string Description 
    { 
     set 
     { 
      if (value != this._description) 
      { 
       this._description = value; 
       NotifyPropertyChanged("Description"); 
      } 
     } 
     get { return _description; } 
    } 

    private string _status; 
    public string Status 
    { 
     set 
     { 
      if (value != this._status) 
      { 
       this._status = value; 
       NotifyPropertyChanged("Statua"); 
      } 
     } 
     get { return _status; } 
    } 

    private bool _enabled; 
    public bool Enabled 
    { 
     set 
     { 
      if (value != this._enabled) 
      { 
       this._enabled = value; 
       NotifyPropertyChanged("Enabled"); 
      } 
     } 
     get { return _enabled; } 
    } 

    private string _upgrade; 
    public string Upgrade 
    { 
     set 
     { 
      if (value != this._upgrade) 
      { 
       this._upgrade = value; 
       NotifyPropertyChanged("Upgrade"); 
      } 
     } 
     get { return _upgrade; } 
    } 

    private string _path; 
    public string Path 
    { 
     set 
     { 
      if (value != this._path) 
      { 
       this._path = value; 
       NotifyPropertyChanged("Path"); 
      } 
     } 
     get { return _path; } 
    } 

    public event PropertyChangedEventHandler PropertyChanged; 
    private void NotifyPropertyChanged(String info) 
    { 
     if (PropertyChanged != null) 
     { 
      PropertyChanged(this, new PropertyChangedEventArgs(info)); 
     } 
    } 

} 

現在，當我修改一個PluginDescription對象的屬性時，DataGrid沒有被更新。我認爲在PluginDescription類上實現INotifyPropertyChange接口是我所需要的。我需要做其他事嗎？

Answer 1

PropertyChanged事件必須提供您的財產的確切名稱。在你的代碼中，你有一些不匹配：WikiUrl財產引發PropertyChanged事件與"Wiki"和Status屬性與"Statua"。先嚐試修復那些。

如果它仍然不起作用，您能否指定您嘗試更改的屬性？

Answer 2

您已經找到錯誤的原因。但爲了避免將來出現這些問題，我建議在可接受的地方使用Lambda表達式。

需要注意的是它帶來的性能損失，雖然，有人在這裏描述的那樣：http://blog.quantumbitdesigns.com/2010/01/26/mvvm-lambda-vs-inotifypropertychanged-vs-dependencyobject/

但屬性更改通知，通常很少會觸發，這是不是一個真正的問題。但這取決於你的使用...