内容更改时 DataGridView 样式不更新

好的，这是我的情况： 我有一个DataGridView含有Messages，应用以下样式。

<Style x:Key="ChangeSetRowStyle" TargetType="{x:Type DataGridRow}">
    <Setter Property="FontWeight" Value="Normal" />
    <Style.Triggers>
        <DataTrigger Binding="{Binding IsRead}" Value="False">
            <Setter Property="FontWeight" Value="Bold" />
        </DataTrigger>
        <DataTrigger Binding="{Binding IsRead}" Value="True">
            <Setter Property="FontWeight" Value="Normal" />
        </DataTrigger>
    </Style.Triggers>
</Style>

我的目的是使未读消息加粗，而已读消息保持正常字体粗细。即使在加载集合时正确应用了样式，但当项目的IsRead属性被改变。风格好像没有更新。

有人可以解释一下吗？谢谢！

Your Message类需要继承自INotifyPropertyChanged和IsRead财产需要提高PropertyChanged修改时的事件。这是一个例子：

public class Message: INotifyPropertyChanged
{
    private bool _isRead;

    public bool IsRead
    {
        get { return _isRead; }
        set
        {
            _isRead = value;
            RaisePropertyChanged("IsRead");
        }
    }


    #region INotifyPropertyChanged Members

    /// <summary>
    /// Raised when a property on this object has a new value.
    /// </summary>
    public event PropertyChangedEventHandler PropertyChanged;

    #endregion

    /// <summary>
    /// Raises this object's PropertyChanged event.
    /// </summary>
    /// <param name="propertyName">The property that has a new value.</param>
    public virtual void RaisePropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            var e = new PropertyChangedEventArgs(propertyName);
            handler(this, e);
        }
    }
}