Wpf自定义inkcanvas绑定

Wpf自定义inkcanvas绑定

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Wpf自定义inkcanvas绑定

本文介绍了Wpf自定义inkcanvas绑定的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 29岁程序员，3月因学历无情被辞！ 我正在尝试将儿童收藏绑定到自定义Inkcanvas。在这一刻，程序从画布到代码绑定没有问题，但没有问题。 谢谢你的帮助 Petr 调试日志： 线程0x2c88已退出，代码为259（0x103）。 'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\Users\petr.ehler \Documents\Visual Studio 2013 \Projects\test_wpf \test_wpf\bin\Debug\test_wpf.exe。符号已加载。 'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ microsoft.Net \assembly \ GAC_MSIL \ System.Configuration \v4 .0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll。符号已加载。 'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ Microsoft.Net \assembly \ GAC_MSIL \ PresentationFramework.Aero \v4 .0_4.0.0.0__31bf3856ad364e35\PresentationFramework.Aero.dll。符号已加载。 System.Windows.Data警告：56：为绑定创建BindingExpression（hash = 22226817）（hash = 54181020） System.Windows.Data警告：58：路径：'BorderItems'系统.Windows.Data警告：61：BindingExpression（hash = 22226817）：默认更新触发器已解析为PropertyChanged System.Windows.Data警告：62：BindingExpression（hash = 22226817）：附加到test_wpf.MyCanvas.Source（hash = 46367191） System.Windows.Data警告：67：BindingExpression（hash = 22226817）：解析源 System.Windows.Data警告：70：BindingExpression（hash = 22226817）：找到数据上下文元素： MyCanvas（hash = 46367191）（OK） System.Windows.Data警告：71：BindingExpression（hash = 22226817）：DataContext为null System.Windows.Data警告：65：BindingExpression（hash = 22226817 ）：解析源延迟 System.Windows.Data警告：67：BindingExpression（hash = 22226817）：解析源 System.Windows.Data警告：70：BindingExpression（hash = 22226） 817）：找到数据上下文元素：MyCanvas（hash = 46367191）（OK） System.Windows.Data警告：78：BindingExpression（hash = 22226817）：激活根项目MainWindow（hash = 3528959） System.Windows.Data警告：108：BindingExpression（hash = 22226817）：在0级 - 对于MainWindow.BorderItems找到存取器RuntimePropertyInfo（BorderItems） System.Windows.Data警告：104：BindingExpression（hash = 22226817） ：使用访问者RuntimePropertyInfo（BorderItems）替换级别0的项目（哈希= 3528959） System.Windows.Data警告：101：BindingExpression（哈希= 22226817）：来自MainWindow的级别0的GetValue（哈希= 3528959） ）使用RuntimePropertyInfo（BorderItems）：ObservableCollection`1（hash = 55866471 Count = 0） System.Windows.Data警告：80：BindingExpression（hash = 22226817）：TransferValue - 得到原始值ObservableCollection`1（hash = 55866471） Count = 0） System.Windows.Data警告：89：BindingExpression（hash = 22226817）：TransferValue - 使用final va lue ObservableCollection`1（hash = 55866471 Count = 0）'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ Microsoft.Net \ assembly\GAC_MSIL\PresentationFramework-SystemXmlLinq\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemXmlLinq.dll。符号已加载。 'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ Microsoft.Net \assembly \ GAC_MSIL \ PresentationFramework-SystemXml \v4 .0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemXml.dll。符号已加载。 'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ Microsoft \\ net\assembly \ GAC_MSIL \ UIAutomationTypes \v4.0_4 .0.0.0__31bf3856ad364e35\UIAutomationTypes.dll。符号已加载。 System.Windows.Data警告：95：BindingExpression（hash = 22226817）：从MainWindow获得PropertyChanged事件（hash = 3528959） System.Windows.Data警告：101：BindingExpression（hash = 22226817）：使用RuntimePropertyInfo（BorderItems）从MainWindow（hash = 3528959）获取0级GetValue：ObservableCollection`1（hash = 55866471 Count = 1） System.Windows.Data警告：80：BindingExpression（hash = 22226817）：TransferValue - 得到原始值ObservableCollection`1（hash = 55866471 Count = 1） System.Windows.Data警告：89：BindingExpression（hash = 22226817）：TransferValue - 使用最终值ObservableCollection`1（hash = 55866471 Count = 1） 'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ Microsoft.Net \assembly\GAC_MSIL \ PresentationFramework-SystemData \v4 .0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemData.dll。符号已加载。 System.Windows.Data警告：95：BindingExpression（hash = 22226817）：从MainWindow获得PropertyChanged事件（hash = 3528959） System.Windows.Data警告：101：BindingExpression（hash = 22226817）：使用RuntimePropertyInfo（BorderItems）从MainWindow（hash = 3528959）获取0级GetValue：ObservableCollection`1（hash = 55866471 Count = 1） System.Windows.Data警告：80：BindingExpression（hash = 22226817）：TransferValue - 得到原始值ObservableCollection`1（hash = 55866471 Count = 1） System.Windows.Data警告：89：BindingExpression（hash = 22226817）：TransferValue - 使用最终值ObservableCollection`1（hash = 55866471 Count = 1） System.Windows.Data警告：95：BindingExpression（hash = 22226817）：从MainWindow获得PropertyChanged事件（hash = 3528959） System.Windows.Data警告：101：BindingExpression（hash = 22226817）：使用RuntimePropertyInfo（BorderItems）从MainWindow（hash = 3528959）获取0级GetValue：ObservableCollection`1（hash = 55866471 Count = 1） S ystem.Windows.Data警告：80：BindingExpression（hash = 22226817）：TransferValue - 得到原始值ObservableCollection`1（hash = 55866471 Count = 1） System.Windows.Data警告：89：BindingExpression（hash = 22226817 ）：TransferValue - 使用最终值ObservableCollection`1（hash = 55866471 Count = 1）线程0x3784已退出，代码为259（0x103）。 线程0x3050已退出，代码为259（0x103）。 程序'[12308] test_wpf.vshost.exe'退出时代码为0（0x0）。 我尝试过： 主类 使用系统; 使用 System.Collections.Generic; 使用 System.Collections.ObjectModel; 使用 System.Collections.Specialized; 使用 System.ComponentModel; 使用 System.Windows; 使用 System.Windows.Input; 命名空间 test_wpf { public partial class MainWindow：Window，INotifyPropertyChanged { public ObservableCollection< ItemDetail> BorderItems { get ; set ; } public event PropertyChangedEventHandler PropertyChanged; public MainWindow（） { InitializeComponent（）; DataContext = this ; BorderItems = new ObservableCollection< ItemDetail>（）; } private void Button_Click（ object sender，RoutedEventArgs e） { if （BorderItems.Count == 0 ） { return ; } BorderItems [ 0 ]。X = 200 ; BorderItems [ 0 ]。Y = 300 ; BorderItems [ 0 ]。宽度= 200 ; BorderItems [ 0 ]。高度= 100 ; if （PropertyChanged！= null ） PropertyChanged（ this ， new PropertyChangedEventArgs（ BorderItems））; } 私有 void Button_Click_1（ object sender，RoutedEventArgs e） { ItemDetail d = new ItemDetail（）; d.X = 100 ; d.Y = 100 ; d.Width = 100 ; d.Height = 100 ; d.Type = text; d.Text = 测试 + BorderItems.Count.ToString（）; BorderItems.Add（d）; if （PropertyChanged！= null ） PropertyChanged（ this ， new PropertyChangedEventArgs（ BorderItems））; } } } MyCanvas 使用系统; 使用 System.Collections.Generic; 使用 System.Collections.ObjectModel; 使用 System.Collections.Specialized; 使用 System.Linq; 使用 System.Text; 使用 System.Threading.Tasks; 使用 System.Windows; 使用 System.Windows.Controls; 使用 System.Windows.Data; 使用 System.Windows.Media; 命名空间 test_wpf { public class MyCanvas：InkCanvas { // 只是一个简单的INotifyCollectionChanged集合 public ObservableCollection< ItemDetail>来源{获取; set ; } public static readonly DependencyProperty SourceProperty = DependencyProperty.Register（ Source， typeof （ObservableCollection< ItemDetail>）， typeof （MyCanvas）， new FrameworkPropertyMetadata（ new ObservableCollection< ItemDetail>（）， new PropertyChangedCallback（SourceChanged）））; // 在设置新值时调用（例如通过绑定） 受保护 静态 void SourceChanged（DependencyObject sender，DependencyPropertyChangedEventArgs args） { // 获取更改本地值 var instance = sender as MyCanvas; // 将要设置的新集合 ObservableCollection< ItemDetail> newCollection = args.NewValue as ObservableCollection< ItemDetail> ;; // 已设置的上一个集合 ObservableCollection< ItemDetail> oldCollection = args.OldValue as ObservableCollection< ItemDetail> ;; if （oldCollection！= null ） { // 从旧集合中删除CollectionChangedEventHandler oldCollection.CollectionChanged - = new NotifyCollectionChangedEventHandler（instance.collection_CollectionChanged）; } // 清除集合中所有以前的子项 instance.Children.Clear（）; if （newCollection！= null ） { // 添加新集合的所有子项 foreach （ItemDetail item in newCollection） { AddControl（item，instance）; } // 将新的CollectionChangedEventHandler添加到新集合 newCollection.CollectionChanged + = new NotifyCollectionChangedEventHandler（instance.collection_CollectionChanged）; } } // 在集合中的项目发生更改时附加 protected void collection_CollectionChanged（ object sender，System.Collections.Specialized.NotifyCollectionChangedEventArgs e） { // 在子集合中添加新项目 foreach （ItemDetail项目 e.NewItems） { AddControl（item）; } } 受保护 静态 void AddControl（ItemDetail item，InkCanvas parentControl） { Border border = new Border（）; border.DataContext = item; border.Background = new SolidColorBrush（（Color）ColorConverter.ConvertFromString（ ＃000000\" ））; border.Width = item.Width; border.Height = item.Height; if （item.Type == text） { TextBlock tb = new TextBlock（）; tb.Foreground = new SolidColorBrush（（Color）ColorConverter.ConvertFromString（ ＃FFFFFF））; tb.FontSize = 25 ; tb.Horizo​​ntalAlignment = Horizo​​ntalAlignment.Center; tb.VerticalAlignment = VerticalAlignment.Center; 绑定TextBinding = new 绑定（ Text ）; TextBinding.Source = item; TextBinding.Mode = BindingMode.TwoWay; tb.SetBinding（TextBlock.TextProperty，TextBinding）; // tb.Text = item.Text; border.Child = tb; } parentControl.Children.Add（border）; Binding XBinding = new Binding（ X）; XBinding.Source = item; XBinding.Mode = BindingMode.TwoWay; 绑定YBinding = new 绑定（ Y）; YBinding.Source = item; YBinding.Mode = BindingMode.TwoWay; border.SizeChanged + = border_SizeChanged; border.SetBinding（InkCanvas.LeftProperty，XBinding）; border.SetBinding（InkCanvas.TopProperty，YBinding）; } private static void border_SizeChanged（ object sender，SizeChangedEventArgs e） { Border border = sender as 边框; if （border == null ） { throw new ArgumentException（ 意外的对象。预期的边界）; } var i = border.DataContext; ItemDetail itemDetail = i as ItemDetail; if （itemDetail == null ） { throw new ArgumentException（ 意外的对象。预期的ItemDetail）; } itemDetail.Width = border.ActualWidth; itemDetail.Height = border.ActualHeight; } 受保护 void AddControl（ItemDetail item） { AddControl（item， this ）; } 静态 MyCanvas（） { DefaultStyleKeyProperty.OverrideMetadata（ typeof （MyCanvas）， new FrameworkPropertyMetadata（ typeof （ MyCanvas）））; } public MyCanvas（）： base （） { } } } 项目明细 使用系统; 使用 System.Collections.Generic; 使用 System.ComponentModel; 使用 System.Linq; 使用 System.Text; 使用 System.Windows.Controls; 命名空间 test_wpf { public class ItemDetail：INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public int X {获得; set ; } public int Y { get ; set ; } public double 宽度{ get ; set ; } public double 高度{ get ; set ; } public string 输入{ get ; set ; } public string 文字{ get ; set ; } } } MainClassWPF < 窗口 x：Class = test_wpf.MainWindow xmlns = http://schemas.microsoft.com/winfx/2006 / xaml / presentation xmlns：x = http://schemas.microsoft.com/winfx/ 2006 / xaml xmlns：src = clr-namespace：test_wpf 标题 = InkCanvasElementSelection ResizeMode = CanResize xmlns：ComponentModel = clr-namespace：System.ComponentModel; assembly = WindowsBase 高度 = 800 宽度 = 600 > < DockPanel LastChildFill = True > < StackPanel DockPanel.Dock = 左 宽度 = 200 方向 = 垂直 > < 行 保证金 = 5 / > < TextBlock > 创建新元素< / TextBlock > < 按钮 点击 = Button_Click_1 高度 = 20 内容 = 新 / > < 行 保证金 = 5 / > < TextBlock > 更改元素0 < / TextBlock > < 按钮 单击 = Button_Click 高度 = 20 内容 = 更改 / > < / StackPanel > < src：MyCanvas 来源 = {Binding Path = BorderItems，Mode = TwoWay} 背景 = AliceBlue EditingMode = 选择 / > < / DockPanel > < / Window > 解决方案 解决方案非常简单。 Inkcanvas不知道ItemDetail类的变化。 ItemDetail类无法观察到。只需更新类如 public class ItemDetail：INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged（ String propertyName） { PropertyChangedEventHandler handler = PropertyChanged; if （ null ！= handler） { handler（ this ， new PropertyChangedEventArgs（propertyName））; } } private int _x; private int _y; private double _width; private double _height; private string _type; private string _text; public int X { get { return _x; } set {_ x = value ; NotifyPropertyChanged(\"X\"); } } public int Y { get { return _y; } set { _y = value; NotifyPropertyChanged(\"Y\"); } } public double Width { get { return _width; } set { _width = value; NotifyPropertyChanged(\"Width\"); } } public double Height { get { return _height; } set { _height = value; NotifyPropertyChanged(\"Height\"); } } public string Type { get { return _type; } set { _type = value; NotifyPropertyChanged(\"Type\"); } } public string Text { get { return _text; } set { _text = value; NotifyPropertyChanged(\"Text\"); } } } and the code is functional. PetrHi,I am trying to Bind Children collection to Custom Inkcanvas. In this moment program binds from canvas to code without problem, but not othreside.Thank you for helpPetrDebug Log:The thread 0x2c88 has exited with code 259 (0x103).'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Users\petr.ehler\Documents\Visual Studio 2013\Projects\test_wpf\test_wpf\bin\Debug\test_wpf.exe'. Symbols loaded.'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll'. Symbols loaded.'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework.Aero\v4.0_4.0.0.0__31bf3856ad364e35\PresentationFramework.Aero.dll'. Symbols loaded.System.Windows.Data Warning: 56 : Created BindingExpression (hash=22226817) for Binding (hash=54181020)System.Windows.Data Warning: 58 : Path: 'BorderItems'System.Windows.Data Warning: 61 : BindingExpression (hash=22226817): Default update trigger resolved to PropertyChangedSystem.Windows.Data Warning: 62 : BindingExpression (hash=22226817): Attach to test_wpf.MyCanvas.Source (hash=46367191)System.Windows.Data Warning: 67 : BindingExpression (hash=22226817): Resolving sourceSystem.Windows.Data Warning: 70 : BindingExpression (hash=22226817): Found data context element: MyCanvas (hash=46367191) (OK)System.Windows.Data Warning: 71 : BindingExpression (hash=22226817): DataContext is nullSystem.Windows.Data Warning: 65 : BindingExpression (hash=22226817): Resolve source deferredSystem.Windows.Data Warning: 67 : BindingExpression (hash=22226817): Resolving sourceSystem.Windows.Data Warning: 70 : BindingExpression (hash=22226817): Found data context element: MyCanvas (hash=46367191) (OK)System.Windows.Data Warning: 78 : BindingExpression (hash=22226817): Activate with root item MainWindow (hash=3528959)System.Windows.Data Warning: 108 : BindingExpression (hash=22226817): At level 0 - for MainWindow.BorderItems found accessor RuntimePropertyInfo(BorderItems)System.Windows.Data Warning: 104 : BindingExpression (hash=22226817): Replace item at level 0 with MainWindow (hash=3528959), using accessor RuntimePropertyInfo(BorderItems)System.Windows.Data Warning: 101 : BindingExpression (hash=22226817): GetValue at level 0 from MainWindow (hash=3528959) using RuntimePropertyInfo(BorderItems): ObservableCollection`1 (hash=55866471 Count=0)System.Windows.Data Warning: 80 : BindingExpression (hash=22226817): TransferValue - got raw value ObservableCollection`1 (hash=55866471 Count=0)System.Windows.Data Warning: 89 : BindingExpression (hash=22226817): TransferValue - using final value ObservableCollection`1 (hash=55866471 Count=0)'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemXmlLinq\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemXmlLinq.dll'. Symbols loaded.'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemXml\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemXml.dll'. Symbols loaded.'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\UIAutomationTypes\v4.0_4.0.0.0__31bf3856ad364e35\UIAutomationTypes.dll'. Symbols loaded.System.Windows.Data Warning: 95 : BindingExpression (hash=22226817): Got PropertyChanged event from MainWindow (hash=3528959)System.Windows.Data Warning: 101 : BindingExpression (hash=22226817): GetValue at level 0 from MainWindow (hash=3528959) using RuntimePropertyInfo(BorderItems): ObservableCollection`1 (hash=55866471 Count=1)System.Windows.Data Warning: 80 : BindingExpression (hash=22226817): TransferValue - got raw value ObservableCollection`1 (hash=55866471 Count=1)System.Windows.Data Warning: 89 : BindingExpression (hash=22226817): TransferValue - using final value ObservableCollection`1 (hash=55866471 Count=1)'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemData\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemData.dll'. Symbols loaded.System.Windows.Data Warning: 95 : BindingExpression (hash=22226817): Got PropertyChanged event from MainWindow (hash=3528959)System.Windows.Data Warning: 101 : BindingExpression (hash=22226817): GetValue at level 0 from MainWindow (hash=3528959) using RuntimePropertyInfo(BorderItems): ObservableCollection`1 (hash=55866471 Count=1)System.Windows.Data Warning: 80 : BindingExpression (hash=22226817): TransferValue - got raw value ObservableCollection`1 (hash=55866471 Count=1)System.Windows.Data Warning: 89 : BindingExpression (hash=22226817): TransferValue - using final value ObservableCollection`1 (hash=55866471 Count=1)System.Windows.Data Warning: 95 : BindingExpression (hash=22226817): Got PropertyChanged event from MainWindow (hash=3528959)System.Windows.Data Warning: 101 : BindingExpression (hash=22226817): GetValue at level 0 from MainWindow (hash=3528959) using RuntimePropertyInfo(BorderItems): ObservableCollection`1 (hash=55866471 Count=1)System.Windows.Data Warning: 80 : BindingExpression (hash=22226817): TransferValue - got raw value ObservableCollection`1 (hash=55866471 Count=1)System.Windows.Data Warning: 89 : BindingExpression (hash=22226817): TransferValue - using final value ObservableCollection`1 (hash=55866471 Count=1)The thread 0x3784 has exited with code 259 (0x103).The thread 0x3050 has exited with code 259 (0x103).The program '[12308] test_wpf.vshost.exe' has exited with code 0 (0x0).What I have tried:Main Classusing System;using System.Collections.Generic;using System.Collections.ObjectModel;using System.Collections.Specialized;using System.ComponentModel;using System.Windows;using System.Windows.Input;namespace test_wpf{ public partial class MainWindow : Window, INotifyPropertyChanged { public ObservableCollection<ItemDetail> BorderItems { get; set; } public event PropertyChangedEventHandler PropertyChanged; public MainWindow() { InitializeComponent(); DataContext = this; BorderItems = new ObservableCollection<ItemDetail>(); } private void Button_Click(object sender, RoutedEventArgs e) { if(BorderItems.Count == 0) { return; } BorderItems[0].X = 200; BorderItems[0].Y = 300; BorderItems[0].Width = 200; BorderItems[0].Height = 100; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("BorderItems")); } private void Button_Click_1(object sender, RoutedEventArgs e) { ItemDetail d = new ItemDetail(); d.X = 100; d.Y = 100; d.Width = 100; d.Height = 100; d.Type = "text"; d.Text = "Test "+BorderItems.Count.ToString(); BorderItems.Add(d); if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("BorderItems")); } }}MyCanvasusing System;using System.Collections.Generic;using System.Collections.ObjectModel;using System.Collections.Specialized;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Media;namespace test_wpf{ public class MyCanvas : InkCanvas { //Just a simple INotifyCollectionChanged collection public ObservableCollection<ItemDetail> Source { get; set; } public static readonly DependencyProperty SourceProperty = DependencyProperty.Register("Source", typeof(ObservableCollection<ItemDetail>), typeof(MyCanvas), new FrameworkPropertyMetadata(new ObservableCollection<ItemDetail>(), new PropertyChangedCallback(SourceChanged))); //called when a new value is set (through binding for example) protected static void SourceChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args) { //gets the instance that changed the "local" value var instance = sender as MyCanvas; //the new collection that will be set ObservableCollection<ItemDetail> newCollection = args.NewValue as ObservableCollection<ItemDetail>; //the previous collection that was set ObservableCollection<ItemDetail> oldCollection = args.OldValue as ObservableCollection<ItemDetail>; if (oldCollection != null) { //removes the CollectionChangedEventHandler from the old collection oldCollection.CollectionChanged -= new NotifyCollectionChangedEventHandler(instance.collection_CollectionChanged); } //clears all the previous children in the collection instance.Children.Clear(); if (newCollection != null) { //adds all the children of the new collection foreach (ItemDetail item in newCollection) { AddControl(item, instance); } //adds a new CollectionChangedEventHandler to the new collection newCollection.CollectionChanged += new NotifyCollectionChangedEventHandler(instance.collection_CollectionChanged); } } //append when an Item in the collection is changed protected void collection_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) { //adds the new items in the children collection foreach (ItemDetail item in e.NewItems) { AddControl(item); } } protected static void AddControl(ItemDetail item, InkCanvas parentControl) { Border border = new Border(); border.DataContext = item; border.Background = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#000000")); border.Width = item.Width; border.Height = item.Height; if(item.Type == "text") { TextBlock tb = new TextBlock(); tb.Foreground = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#FFFFFF")); tb.FontSize = 25; tb.HorizontalAlignment = HorizontalAlignment.Center; tb.VerticalAlignment = VerticalAlignment.Center; Binding TextBinding = new Binding("Text"); TextBinding.Source = item; TextBinding.Mode = BindingMode.TwoWay; tb.SetBinding(TextBlock.TextProperty, TextBinding); //tb.Text = item.Text; border.Child = tb; } parentControl.Children.Add(border); Binding XBinding = new Binding("X"); XBinding.Source = item; XBinding.Mode = BindingMode.TwoWay; Binding YBinding = new Binding("Y"); YBinding.Source = item; YBinding.Mode = BindingMode.TwoWay; border.SizeChanged += border_SizeChanged; border.SetBinding(InkCanvas.LeftProperty, XBinding); border.SetBinding(InkCanvas.TopProperty, YBinding); } private static void border_SizeChanged(object sender, SizeChangedEventArgs e) { Border border = sender as Border; if (border == null) { throw new ArgumentException("Unexpected object. Expected border"); } var i = border.DataContext; ItemDetail itemDetail = i as ItemDetail; if (itemDetail == null) { throw new ArgumentException("Unexpected object. Expected ItemDetail"); } itemDetail.Width = border.ActualWidth; itemDetail.Height = border.ActualHeight; } protected void AddControl(ItemDetail item) { AddControl(item, this); } static MyCanvas() { DefaultStyleKeyProperty.OverrideMetadata(typeof(MyCanvas), new FrameworkPropertyMetadata(typeof(MyCanvas))); } public MyCanvas() : base() { } }}Item detailusing System;using System.Collections.Generic;using System.ComponentModel;using System.Linq;using System.Text;using System.Windows.Controls;namespace test_wpf{ public class ItemDetail: INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public int X { get; set; } public int Y { get; set; } public double Width { get; set; } public double Height { get; set; } public string Type { get; set; } public string Text { get; set; } }}MainClassWPF<Window x:Class="test_wpf.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:src="clr-namespace:test_wpf" Title="InkCanvasElementSelection" ResizeMode="CanResize" xmlns:ComponentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase" Height="800" Width="600"> <DockPanel LastChildFill="True"> <StackPanel DockPanel.Dock="Left" Width="200" Orientation="Vertical"> <Line Margin="5"/> <TextBlock>Create new Element</TextBlock> <Button Click="Button_Click_1" Height="20" Content="New"/> <Line Margin="5"/> <TextBlock>Change Element 0</TextBlock> <Button Click="Button_Click" Height="20" Content="Change"/> </StackPanel> <src:MyCanvas Source="{Binding Path=BorderItems, Mode=TwoWay}" Background="AliceBlue" EditingMode="Select"/> </DockPanel></Window> 解决方案 Hi,solution was quite simple. Inkcanvas did not know about changes in ItemDetail class. The class ItemDetail was not observable. Just update class likepublic class ItemDetail: INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged(String propertyName) { PropertyChangedEventHandler handler = PropertyChanged; if (null != handler) { handler(this, new PropertyChangedEventArgs(propertyName)); } } private int _x; private int _y; private double _width; private double _height; private string _type; private string _text; public int X { get { return _x; } set { _x = value; NotifyPropertyChanged("X"); } } public int Y { get { return _y; } set { _y = value; NotifyPropertyChanged("Y"); } } public double Width { get { return _width; } set { _width = value; NotifyPropertyChanged("Width"); } } public double Height { get { return _height; } set { _height = value; NotifyPropertyChanged("Height"); } } public string Type { get { return _type; } set { _type = value; NotifyPropertyChanged("Type"); } } public string Text { get { return _text; } set { _text = value; NotifyPropertyChanged("Text"); } } }and the code is functional.Petr 这篇关于Wpf自定义inkcanvas绑定的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！
08-14 10:10
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