wpf绑定

1、新手比较容易犯的错误

新手为了简单按照网上的说法直接这样

 <Label Grid.Row="1" Name="linkLable" Content="{Binding Path=LinkString}" HorizontalAlignment="Center" VerticalAlignment="Center" ></Label>

public partial class MainWindow : Window
 {
     string LinkString {
            get ;
            set ;
        }
       public MainWindow()
        {
            InitializeComponent();

            LinkString = "hehe";

            linkLable.DataContext = this;

            return;
}}

结果死活不起作用。查询网上：MainWindow 实现了INotifyPropertyChanged 接口还是不起作用。

其实是要实现：LinkStringProperty

        string LinkString {
            get { return (string)GetValue(LinkStringProperty); }
            set  {      SetValue(LinkStringProperty, value); }
        }

        public static readonly DependencyProperty LinkStringProperty = DependencyProperty.Register("LinkString", typeof(string), typeof(MainWindow));

2、简单绑定代码

           Binding binding = new Binding();

            binding.Source = ListTest_;           

binding.Path = new PropertyPath("LinkString");

            binding.Converter = new TestContentConverter();

            BindingOperations.SetBinding(this.lab, Label.ContentProperty, binding);

3、多参数绑定

有的时候，一个控件显示的内容需要多个参数来绑定，代码如下：

 <Label Grid.Row="1" Name="linkLable" HorizontalAlignment="Center" VerticalAlignment="Center" >
                <!--<Label.Content>
                    <MultiBinding Converter="{StaticResource LinkMultiValueConverter}">
                        <Binding Path="FirstName" />
                        <Binding Path="Surname" />
                    </MultiBinding>
                </Label.Content>-->                
            </Label>

 class PosDataSource : INotifyPropertyChanged
    {
        bool linkParamOk;
        public bool LinkParamOk {
            get
            {
                return   linkParamOk;
            }
            set
            {
                if (linkParamOk != value)
                {
                    linkParamOk = value;
                    OnPropertyChanged("LinkParamOk");
                }
            }
        }

        bool linkPosOk;
        public bool LinkPosOk
        {
            get
            {
                return linkPosOk;
            }
            set
            {
                if (linkPosOk != value)
                {
                    linkPosOk = value;
                    OnPropertyChanged("LinkPosOk");
                }
            }
        }


        public event PropertyChangedEventHandler PropertyChanged;
        public virtual void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

    public class LinkOkMultiValueConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return String.Format("参数服务连接{0} 位置服务连接{1}", values[0], values[1]);
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    public partial class MainWindow : Window
    {

        PosDataSource pPosData = new PosDataSource();
        

        PosDataClientImp posClient;
        PosSetSever.PositionSet.PositionSetClient client;
        Channel channel;

        List<Tuple<string, int, int>> listStation = new List<Tuple<string, int, int>>();

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            pPosData.LinkParamOk = true;
        }

        public MainWindow()
        {
            InitializeComponent();
            //Binding binding = new Binding();
            //binding.Source = this;
            //binding.Path = new PropertyPath("LinkString");
            //BindingOperations.SetBinding(this.PosShowLable, Label.ContentProperty, binding);

            MultiBinding mb = new MultiBinding();

            {
                Binding bd = new Binding();
                bd.Source = pPosData;
                bd.Path = new PropertyPath("LinkParamOk");
                mb.Bindings.Add(bd);
            }

            {
                Binding bd = new Binding();
                bd.Source = pPosData;
                bd.Path = new PropertyPath("LinkPosOk");
                mb.Bindings.Add(bd);
            }

            mb.Converter = new LinkOkMultiValueConverter() ;

            BindingOperations.SetBinding(this.linkLable, Label.ContentProperty, mb);




            return;}