C# 未在WPF数据模板中绘制线
我正在尝试收集正确的WPF数据模板,以获得一个Listview,该Listview对于每个项目都有一个Border+画布(请参见),然后在该画布上为最终节点集合中的每个项目绘制一条线。它几乎可以工作,但目前我在画布上没有画线:在调试输出窗口中,我看到: System.Windows.Data错误:40:BindingExpression路径错误:“在对象”“CalloutGroup'(HashCode=35061213)”上找不到CalloutGroup属性。BindingExpression:Path=callout组;DataItem='CalloutGroup'(HashCode=35061213);目标元素是“ItemsControl”(名称=“”);目标属性为“ItemsSource”(类型为“IEnumerable”) 这是MainWindow.XamlC# 未在WPF数据模板中绘制线,c#,wpf,xaml,wpf-controls,datatemplate,C#,Wpf,Xaml,Wpf Controls,Datatemplate,我正在尝试收集正确的WPF数据模板,以获得一个Listview,该Listview对于每个项目都有一个Border+画布(请参见),然后在该画布上为最终节点集合中的每个项目绘制一条线。它几乎可以工作,但目前我在画布上没有画线:在调试输出窗口中,我看到: System.Windows.Data错误:40:BindingExpression路径错误:“在对象”“CalloutGroup'(HashCode=35061213)”上找不到CalloutGroup属性。BindingExpression:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:CalloutControl" x:Class="CalloutControl.MainWindow"
Title="MainWindow" Height="430.597" Width="525">
<Window.Resources>
<DataTemplate x:Key="LineTemplate">
<Line X1 ="{Binding X}" X2="{Binding X}" Stroke="Wheat"
StrokeThickness="10" Y1="{Binding Y}" Y2="{Binding Y}"/>
</DataTemplate>
<DataTemplate x:Key="GroupTemplate">
<Border Width="200" Height ="{Binding DistributionHeight}" BorderThickness="5" Background="Brown" BorderBrush="Red">
<ItemsControl ItemsSource="{Binding Path=CalloutGroup}"
ItemTemplate="{StaticResource LineTemplate}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Canvas Background="Beige"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
</Border>
</DataTemplate>
</Window.Resources>
<Grid>
<Border>
<ListView ItemsSource="{Binding Groups}"
ItemTemplate="{StaticResource GroupTemplate}">
</ListView>
</Border>
</Grid>
</Window>
MainWindow.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace CalloutControl
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
var vm = new MainWindowViewModel();
DataContext = vm;
}
}
}
使用系统;
使用System.Collections.Generic;
使用System.Linq;
使用系统文本;
使用System.Threading.Tasks;
使用System.Windows;
使用System.Windows.Controls;
使用System.Windows.Data;
使用System.Windows.Documents;
使用System.Windows.Input;
使用System.Windows.Media;
使用System.Windows.Media.Imaging;
使用System.Windows.Navigation;
使用System.Windows.Shapes;
命名空间调用控件
{
///
///MainWindow.xaml的交互逻辑
///
公共部分类主窗口:窗口
{
公共主窗口()
{
初始化组件();
var vm=新的MainWindowViewModel();
DataContext=vm;
}
}
}
然后单击ViewModel->MainWindowViewModel.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections.ObjectModel;
namespace CalloutControl
{
public class CalloutItem : INotifyPropertyChanged
{
public CalloutItem()
{
}
public CalloutItem (int length,
int itemNum,
double x,
double y ){
Length = length;
ItemNum = itemNum;
X = x;
Y = y;
}
private int length;
public int Length
{
get { return length; }
set
{
length = value;
OnPropertyChanged("Length");
}
}
private int itemNum;
public int ItemNum
{
get { return itemNum; }
set { itemNum = value;
OnPropertyChanged("ItemNum");
}
}
//public int ItemNum;
private double x;
public double X
{
get { return x; }
set { x = value;
OnPropertyChanged("X");
}
}
private double y;
public double Y
{
get { return y; }
set { y = value;
OnPropertyChanged("Y");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
public class CalloutGroup : INotifyPropertyChanged
{
ObservableCollection<CalloutItem> group = new ObservableCollection<CalloutItem>();
public CalloutGroup(int nItems)
{
NumItems = nItems;
}
public ObservableCollection<CalloutItem> Group
{
get { return group; }
set
{
group = value;
OnPropertyChanged("Group");
}
}
private double distributionHeight = 400;
public double DistributionHeight
{
get { return distributionHeight; }
set
{
distributionHeight = value;
Redistribute();
OnPropertyChanged("DistributionHeight");
}
}
private void Redistribute()
{
double step = distributionHeight / numItems;
double currY = step / 2 ;
var redistArr = group.ToArray();
for (int i = 0; i < group.Count(); i++)
{
redistArr[i].Y = currY;
currY += step;
}
OnPropertyChanged("Group");
}
private int numItems = 10;
public int NumItems
{
get { return numItems; }
set
{
numItems = value;
group.Clear();
for (int i = 0; i < numItems; i++)
{
group.Add(new CalloutItem());
}
Redistribute();
OnPropertyChanged("NumItems");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
public class MainWindowViewModel : INotifyPropertyChanged
{
ObservableCollection<CalloutGroup> groups = new ObservableCollection<CalloutGroup>();
public ObservableCollection<CalloutGroup> Groups
{
get { return groups; }
set { groups = value;
OnPropertyChanged("Groups");
}
}
public MainWindowViewModel ()
{
groups.Add(new CalloutGroup(3));
groups.Add(new CalloutGroup(3));
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
}
使用系统;
使用System.Collections.Generic;
使用系统组件模型;
使用System.Linq;
使用系统文本;
使用System.Threading.Tasks;
使用System.Collections.ObjectModel;
命名空间调用控件
{
公共类标注项:INotifyPropertyChanged
{
公共物品(
{
}
公共项(整数长度,
int itemNum,
双x,
双y){
长度=长度;
ItemNum=ItemNum;
X=X;
Y=Y;
}
私有整数长度;
公共整数长度
{
获取{返回长度;}
设置
{
长度=值;
不动产变更(“长度”);
}
}
私有int itemNum;
公共int ItemNum
{
获取{return itemNum;}
设置{itemNum=value;
OnPropertyChanged(“ItemNum”);
}
}
//公共int ItemNum;
私人双x;
公共双X
{
获取{return x;}
设置{x=值;
不动产变更(“X”);
}
}
私人双y;
公共双Y
{
获取{返回y;}
设置{y=值;
不动产变更(“Y”);
}
}
公共事件属性更改事件处理程序属性更改;
受保护的void OnPropertyChanged(字符串名称)
{
PropertyChangedEventHandler处理程序=PropertyChanged;
if(处理程序!=null)
{
处理程序(此,新PropertyChangedEventArgs(名称));
}
}
}
公共类Callout组:INotifyPropertyChanged
{
ObservableCollection组=新的ObservableCollection();
公共呼叫组(int nItems)
{
NumItems=nItems;
}
公共可观测收集组
{
获取{返回组;}
设置
{
组=值;
不动产变更(“集团”);
}
}
私人双分配高度=400;
公共双分配高度
{
获取{return distributionHeight;}
设置
{
分布高度=数值;
重新分配();
OnProperty变更(“分配高度”);
}
}
私有空间重新分配()
{
双台阶=分布高度/单位;
双咖喱=step/2;
var redistArr=group.ToArray();
对于(int i=0;i<ItemsControl ItemsSource="{Binding Group}"
<ItemsControl ItemsSource="{Binding Path=CalloutGroup}"`
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace CalloutControl
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
var vm = new MainWindowViewModel();
vm.Groups.Add(new CalloutControl.CalloutGroup(2));
vm.Groups.Add(new CalloutControl.CalloutGroup(2));
vm.Groups[0].Group.Add(new CalloutControl.CalloutItem(10, 1, 0, 100, 200, 100));
vm.Groups[0].Group.Add(new CalloutControl.CalloutItem(10, 2, 100, 0, 100, 200));
vm.Groups[1].Group.Add(new CalloutControl.CalloutItem(10, 1, 100, 0, 200, 100));
vm.Groups[1].Group.Add(new CalloutControl.CalloutItem(10, 2, 100, 200, 200, 100));
DataContext = vm;
}
}
}
namespace CalloutControl
{
public class CalloutItem : INotifyPropertyChanged
{
public CalloutItem()
{
}
public CalloutItem(int length,
int itemNum,
double _x1,
double _y1,
double _x2,
double _y2)
{
Length = length;
ItemNum = itemNum;
X1 = _x1;
Y1 = _y1;
X2 = _x2;
Y2 = _y2;
}
private int length;
public int Length
{
get { return length; }
set
{
length = value;
OnPropertyChanged("Length");
}
}
private int itemNum;
public int ItemNum
{
get { return itemNum; }
set
{
itemNum = value;
OnPropertyChanged("ItemNum");
}
}
//public int ItemNum;
private double x1;
public double X1
{
get { return x1; }
set
{
x1 = value;
OnPropertyChanged("X1");
}
}
private double y1;
public double Y1
{
get { return y1; }
set
{
y1 = value;
OnPropertyChanged("Y1");
}
}
private double x2;
public double X2
{
get { return x2; }
set
{
x2 = value;
OnPropertyChanged("X2");
}
}
private double y2;
public double Y2
{
get { return y2; }
set
{
y2 = value;
OnPropertyChanged("Y2");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
public class CalloutGroup : INotifyPropertyChanged
{
ObservableCollection<CalloutItem> group = new ObservableCollection<CalloutItem>();
public CalloutGroup(int nItems)
{
NumItems = nItems;
}
public ObservableCollection<CalloutItem> Group
{
get { return group; }
set
{
group = value;
OnPropertyChanged("Group");
}
}
private double distributionHeight = 200;
public double DistributionHeight
{
get { return distributionHeight; }
set
{
distributionHeight = value;
Redistribute();
OnPropertyChanged("DistributionHeight");
}
}
private void Redistribute()
{
double step = distributionHeight / numItems;
double currY = step / 2;
var redistArr = group.ToArray();
for (int i = 0; i < group.Count(); i++)
{
redistArr[i].Y1 = currY;
currY += step;
}
OnPropertyChanged("Group");
}
private int numItems = 10;
public int NumItems
{
get { return numItems; }
set
{
numItems = value;
group.Clear();
for (int i = 0; i < numItems; i++)
{
//group.Add(new CalloutItem());
}
Redistribute();
OnPropertyChanged("NumItems");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
public class MainWindowViewModel : INotifyPropertyChanged
{
ObservableCollection<CalloutGroup> groups = new ObservableCollection<CalloutGroup>();
public ObservableCollection<CalloutGroup> Groups
{
get { return groups; }
set
{
groups = value;
OnPropertyChanged("Groups");
}
}
public MainWindowViewModel()
{
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
}
<Window.Resources>
<DataTemplate x:Key="LineTemplate">
<Line X1="{Binding X1}" X2="{Binding X2}"
Y1="{Binding Y1}" Y2="{Binding Y2}"
Stroke="Blue"
StrokeThickness="10" />
</DataTemplate>
<DataTemplate x:Key="GroupTemplate">
<Border BorderThickness="5" Background="Brown" BorderBrush="Red">
<ItemsControl ItemsSource="{Binding Group}"
ItemTemplate="{StaticResource LineTemplate}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Canvas Background="Transparent" Width="200" Height="{Binding DistributionHeight}"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
</Border>
</DataTemplate>
</Window.Resources>
<Grid>
<Border>
<ListView ItemsSource="{Binding Groups}" ItemTemplate="{StaticResource GroupTemplate}">
</ListView>
</Border>
</Grid>