最近在学习WPF,通过看书,敲代码和做笔记等各种方式.昨天学习完了Binding这一章... ... 画了张图进行总结,以备遗忘时查看.

 

 

 1.Binding数据的校验

        

public _02Binding_ValidationRules()        {            InitializeComponent();            Binding binding = new Binding("Value") { Source = slider1, UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged };             RangeValidationRule rvr = new RangeValidationRule();            rvr.ValidatesOnTargetUpdated = true;            binding.ValidationRules.Add(rvr);            binding.NotifyOnValidationError = true;             textBox1.SetBinding(TextBox.TextProperty, binding);             this.textBox1.AddHandler(Validation.ErrorEvent, new RoutedEventHandler(ValidationError));            //this.slider1.AddHandler(Validation.ErrorEvent, new RoutedEventHandler(ValidationError2));        }         void ValidationError(Object sender, RoutedEventArgs e)        {            if (Validation.GetErrors(this.textBox1).Count > 0)            { textBox1.ToolTip = Validation.GetErrors(this.textBox1)[0].ErrorContent.ToString(); }        }          public class RangeValidationRule : ValidationRule    {        public override ValidationResult Validate(object value, CultureInfo cultureInfo)        {            double d;            if (double.TryParse(value.ToString(), out d))            {                if (d >= 0 && d <= 100)                {                    return new ValidationResult(true, null);                }            }              return new ValidationResult(false, "验证失败!");        }    }

 

 

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   2.Binding的数据转换

 

(效果图)

 

 

C#  /// 
    /// 种类    /// 
    public enum Category    {        Bomber,        Fighter    }     /// 
    /// 状态    /// 
    public enum State    {        Available,        Locked,        Unknown    }     /// 
    /// 飞机类    /// 
    public class Plane    {        public string Name { get; set; }         public Category Category { get; set; }         public State State { get; set; }     }   C# 窗体.cs  /// 
        /// 给ListBox的ItemsSource属性赋值        /// 
        ///         ///         private void buttonLoad_Click(object sender, RoutedEventArgs e)        {            ObservableCollection
       
         planeList = new ObservableCollection
        
         ()            {                new Plane(){Category=Category.Bomber,Name="B-1",State=State.Unknown},                new Plane(){Category=Category.Bomber,Name="B-2",State=State.Unknown},                new Plane(){Category=Category.Fighter,Name="F-22",State=State.Unknown},                new Plane(){Category=Category.Fighter,Name="Su-47",State=State.Unknown},                new Plane(){Category=Category.Bomber,Name="B-52",State=State.Unknown},                new Plane(){Category=Category.Fighter,Name="J-10",State=State.Unknown},            };             this.listBoxPlane.ItemsSource=planeList;                     }         private void buttonSave_Click(object sender, RoutedEventArgs e)        {            StringBuilder sb = new StringBuilder();            foreach (Plane  p in listBoxPlane.Items)            {                sb.AppendLine(string.Format("Category={0},Name={1},State={2}",p.Category,p.Name,p.State));            }            File.WriteAllText(@"D:\PlaneList.txt",sb.ToString());            MessageBox.Show("OK");        }
        
       

 

 

C# 转换类 需要IValueConverter接口

Convert函数为源到目标时调用

ConvertBack函数为目标到源时调用

 

 

 

public class CategoryToSourceConverter : IValueConverter    {        //将Category转换为Uri        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)        {            Category c = (Category)value;            switch (c)            {                case Category.Bomber:                    return @"Icons\Bomber.png";                 case Category.Fighter:                    return @"Icons\Fighter.png";                 default:                    return null;            }        }         public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {            throw new NotImplementedException();        }    }       public class StateToNullabelBoolConverter : IValueConverter    {          /// 
        ///将State转换为Bool        /// 
        ///         ///         ///         ///         /// 
               public object Convert(object value, Type targetType, object parameter, CultureInfo culture)        {            State s = (State)value;            switch (s)            {                case State.Available:                    return true;                case State.Locked:                    return false;                case State.Unknown:                default:                    return null;            }        }         /// 
        /// 将Bool转换为State        /// 
        ///         ///         ///         ///         /// 
               public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)        {            bool? nb = (bool?)value;            switch (nb)            {                case true:                    return  State.Available;                    case false:                    return  State.Locked;                    case null:                          default:                    return  State.Unknown;                      }        }    }   Xaml     
               
                
            
             
               
                    
                         
                              
                                   
                                    
                                    
                                
                           
                      
                 
                 
                 
             
       

 

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3.MultiBinding(多路Binding)

 

 

 

 

C# namespace MyTestWPFApplication._2015年9月16日 {    /// 
    /// _04MultiBinding.xaml 的交互逻辑    /// 
    public partial class _04MultiBinding : Window    {        public _04MultiBinding()        {            InitializeComponent();            SetMultiBinding();        }          void SetMultiBinding()        {            Binding b1 = new Binding("Text") { Source = textBox1 };            Binding b2 = new Binding("Text") { Source = textBox2 };            Binding b3 = new Binding("Text") { Source = textBox3 };            Binding b4 = new Binding("Text") { Source = textBox4 };             MultiBinding mb = new MultiBinding() { Mode = BindingMode.OneWay };            mb.Bindings.Add(b1);            mb.Bindings.Add(b2);            mb.Bindings.Add(b3);            mb.Bindings.Add(b4);             mb.Converter = new LogonMultiBindingConverter();            button1.SetBinding(Button.IsEnabledProperty, mb);        }    }   //因为这里的Converter类是是用来给MultiBinding的Converter来指定的.所以继承的接口不再是IValueConverter而是IMultiValueConverter    class LogonMultiBindingConverter : IMultiValueConverter    {                public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {             if (!values.Cast
      
       ().Any(text => string.IsNullOrEmpty(text))                && values[0].ToString() == values[1].ToString()                && values[2].ToString() == values[3].ToString())            {                return true;            }            return false;        }         public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)        {            throw new NotImplementedException();        }    } }   XAML    
               
                
                
                
                
            
       
      

 

 

 

   

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Binding学完了!