wpf Expander,该怎么处理

wpf Expander

<Expander.Header>
   <DockPanel >
      <Label Name="gropname" Content="{Binding Name,Converter={StaticResource GroupConver}}" />
 </DockPanel >
</Expander.Header>
 
怎么动态改变分组的名字  比如   我的好友[10/65]          
当数据源发生变化的时候去执行转换希望变成   我的好友[11/65]  
求大神指点！！！！！             
[解决办法]
数据源改变的时候去修改Label绑定的Name的值不就可以了吗？
[解决办法]
你的数据源必须要有通知啊，实现了INotifyPropertyChanged的，才会通知系统属性改变了
[解决办法]
考虑到你的问题应该是涉及到公司信息，所以不方便透漏全部信息，那么我就猜测能完成你那个效果的做法吧：

    <Grid>
        <Expander x:Name="expander1" HorizontalAlignment="Left" Margin="49,48,0,0" VerticalAlignment="Top">
            <Expander.HeaderTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Tag.Name, ElementName=expander1}"/>
                        <TextBlock Text="["/>
                        <TextBlock Text="{Binding Tag.Current, ElementName=expander1}"/>
                        <TextBlock Text="/"/>
                        <TextBlock Text="{Binding Tag.All, ElementName=expander1}"/>
                        <TextBlock Text="]"/>
                    </StackPanel>
                </DataTemplate>
            </Expander.HeaderTemplate>
        </Expander>
        <Button Content="某一时刻在线人数改变" HorizontalAlignment="Left" Margin="167,55,0,0" VerticalAlignment="Top" Width="136" Click="Button_Click"/>
    </Grid>

public partial class TestWindow : Window
    {
        public class ExpanderTest:INotifyPropertyChanged
        {
            private String name;
            /// <summary>
            /// 部门名称
            /// </summary>
            public String Name
            {
                get { return name; }
                set { name = value; }
            }

            private Int32 all;
            /// <summary>
            /// 部门总人数
            /// </summary>
            public Int32 All 
 
            {
                get { return all; }
                set 
                { 
                    all = value;
                    NotifyPropertyChanged("All");
                }
            }

            private Int32 current;
            /// <summary>
            /// 部门当前在线人数
            /// </summary>
            public Int32 Current
            {
                get { return current; }
                set 
                { 
                    current = value;
                    NotifyPropertyChanged("Current");
                }
            }

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

        public TestWindow()
        {
            InitializeComponent();

            /* ExpanderTest是我假设你能知道部门的名称和部门的实际人数
             * 通过对Expander控件的Tag属性赋值，界面的Expander的Header用模板来改变
             * 模板中有3个TextBlock分别绑定ExpanderTest中的3个属性
             */
            ExpanderTest test = new ExpanderTest { Name = "OOXX", All = 10, Current = 0 };
            this.expander1.Tag = test;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            //这里就模拟在某一时刻，有人登录什么的，就改变Current这个属性
            ExpanderTest temp = this.expander1.Tag as ExpanderTest;
            if (temp != null) {
                temp.Current++;
            }
        }
    }