回答編集履歴
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見直しキャンペーン中
answer
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愚直に書くとだるいですね。
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子孫探索には`LogicalTreeHelper`や`VisualTreeHelper`があります（詳細は調べてください）
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あまり使いやすくないので拡張メソッドにしておくと楽でいいです。
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```
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<Window
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x:Class="Questions235664.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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<Window.Resources>
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<Viewbox x:Key="testCanvasImage">
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<Canvas>
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<Canvas>
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<Canvas>
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<Path Fill="#000000" StrokeThickness="0">
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<Path.Data>
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<PathGeometry Figures="" />
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</Path.Data>
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</Path>
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<Path x:Name="Path2" Fill="#FFFFFF" />
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</Canvas>
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</Canvas>
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</Canvas>
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</Viewbox>
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</Window.Resources>
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</Window>
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```
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```
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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using System.Windows.Shapes;
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namespace Questions235664
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{
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public partial class MainWindow : Window
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{
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public MainWindow()
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{
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InitializeComponent();
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var viewBox = FindResource("testCanvasImage") as Viewbox;
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// 愚直に書くと
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var canvas1 = viewBox.Child as Canvas;
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var canvas2 = canvas1.Children[0] as Canvas;
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var canvas3 = canvas2.Children[0] as Canvas;
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var path = canvas3.Children[0] as Path;
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Debug.WriteLine(path.Fill);
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// 便利拡張メソッド使用
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path = viewBox.Descendants<Path>().First();
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Debug.WriteLine(path.Fill);
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// 子孫に探し物が複数ある場合Nameかなんかを付けておく
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path = viewBox.Descendants<Path>().First(x => x.Name == "Path2");
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Debug.WriteLine(path.Fill);
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}
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}
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// https://blog.xin9le.net/entry/2013/10/29/222336
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static class DependencyObjectExtensions
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{
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public static IEnumerable<DependencyObject> Children(this DependencyObject obj)
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{
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if(obj == null) throw new ArgumentNullException(nameof(obj));
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var count = VisualTreeHelper.GetChildrenCount(obj);
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if(count == 0) yield break;
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for(var i = 0; i < count; i++)
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{
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var child = VisualTreeHelper.GetChild(obj, i);
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if(child != null) yield return child;
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}
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}
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public static IEnumerable<DependencyObject> Descendants(this DependencyObject obj)
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{
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if(obj == null) throw new ArgumentNullException(nameof(obj));
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foreach(var child in obj.Children())
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{
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yield return child;
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foreach(var grandChild in child.Descendants())
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yield return grandChild;
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}
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}
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public static IEnumerable<T> Children<T>(this DependencyObject obj) where T : DependencyObject
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=> obj.Children().OfType<T>();
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public static IEnumerable<T> Descendants<T>(this DependencyObject obj) where T : DependencyObject
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=> obj.Descendants().OfType<T>();
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}
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}
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```
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101
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-
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1
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+
愚直に書くとだるいですね。
|
|
2
|
+
子孫探索には`LogicalTreeHelper`や`VisualTreeHelper`があります（詳細は調べてください）
|
|
3
|
+
あまり使いやすくないので拡張メソッドにしておくと楽でいいです。
|
|
4
|
+
|
|
5
|
+
```xml
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6
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+
<Window
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|
7
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+
x:Class="Questions235664.MainWindow"
|
|
8
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+
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
|
|
9
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+
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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|
10
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+
<Window.Resources>
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11
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+
<Viewbox x:Key="testCanvasImage">
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12
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+
<Canvas>
|
|
13
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+
<Canvas>
|
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14
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+
<Canvas>
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|
15
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+
<Path Fill="#000000" StrokeThickness="0">
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16
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+
<Path.Data>
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17
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+
<PathGeometry Figures="" />
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18
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</Path.Data>
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19
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</Path>
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20
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<Path x:Name="Path2" Fill="#FFFFFF" />
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21
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</Canvas>
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22
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</Canvas>
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23
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</Canvas>
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24
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</Viewbox>
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25
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+
</Window.Resources>
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26
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+
</Window>
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27
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+
```
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28
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+
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29
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+
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30
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+
```cs
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31
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+
using System;
|
|
32
|
+
using System.Collections.Generic;
|
|
33
|
+
using System.Diagnostics;
|
|
34
|
+
using System.Linq;
|
|
35
|
+
using System.Windows;
|
|
36
|
+
using System.Windows.Controls;
|
|
37
|
+
using System.Windows.Media;
|
|
38
|
+
using System.Windows.Shapes;
|
|
39
|
+
|
|
40
|
+
namespace Questions235664
|
|
41
|
+
{
|
|
42
|
+
public partial class MainWindow : Window
|
|
43
|
+
{
|
|
44
|
+
public MainWindow()
|
|
45
|
+
{
|
|
46
|
+
InitializeComponent();
|
|
47
|
+
|
|
48
|
+
var viewBox = FindResource("testCanvasImage") as Viewbox;
|
|
49
|
+
|
|
50
|
+
// 愚直に書くと
|
|
51
|
+
var canvas1 = viewBox.Child as Canvas;
|
|
52
|
+
var canvas2 = canvas1.Children[0] as Canvas;
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53
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+
var canvas3 = canvas2.Children[0] as Canvas;
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54
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+
var path = canvas3.Children[0] as Path;
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|
55
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+
Debug.WriteLine(path.Fill);
|
|
56
|
+
|
|
57
|
+
// 便利拡張メソッド使用
|
|
58
|
+
path = viewBox.Descendants<Path>().First();
|
|
59
|
+
Debug.WriteLine(path.Fill);
|
|
60
|
+
|
|
61
|
+
// 子孫に探し物が複数ある場合Nameかなんかを付けておく
|
|
62
|
+
path = viewBox.Descendants<Path>().First(x => x.Name == "Path2");
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63
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+
Debug.WriteLine(path.Fill);
|
|
64
|
+
}
|
|
65
|
+
}
|
|
66
|
+
|
|
67
|
+
// https://blog.xin9le.net/entry/2013/10/29/222336
|
|
68
|
+
static class DependencyObjectExtensions
|
|
69
|
+
{
|
|
70
|
+
public static IEnumerable<DependencyObject> Children(this DependencyObject obj)
|
|
71
|
+
{
|
|
72
|
+
if(obj == null) throw new ArgumentNullException(nameof(obj));
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|
73
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+
|
|
74
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+
var count = VisualTreeHelper.GetChildrenCount(obj);
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75
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+
if(count == 0) yield break;
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76
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+
|
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77
|
+
for(var i = 0; i < count; i++)
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78
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+
{
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79
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+
var child = VisualTreeHelper.GetChild(obj, i);
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80
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+
if(child != null) yield return child;
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81
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+
}
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|
82
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+
}
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|
83
|
+
public static IEnumerable<DependencyObject> Descendants(this DependencyObject obj)
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|
84
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+
{
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|
85
|
+
if(obj == null) throw new ArgumentNullException(nameof(obj));
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86
|
+
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87
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+
foreach(var child in obj.Children())
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88
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+
{
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89
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+
yield return child;
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90
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+
foreach(var grandChild in child.Descendants())
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91
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yield return grandChild;
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92
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+
}
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93
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+
}
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94
|
+
public static IEnumerable<T> Children<T>(this DependencyObject obj) where T : DependencyObject
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95
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=> obj.Children().OfType<T>();
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|
96
|
+
public static IEnumerable<T> Descendants<T>(this DependencyObject obj) where T : DependencyObject
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97
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=> obj.Descendants().OfType<T>();
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98
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+
}
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|
99
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+
}
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|
100
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+
```
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101
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+
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102
102
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参考 [VisualTreeの子孫要素を取得する - xin9le.net](https://blog.xin9le.net/entry/2013/10/29/222336)
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