winrt代码获取datatemplate中的控件

此方法会递归遍历该DependencyObject的所有VisualChildren（一般用于获取template中未知Name属性但已知类型的控件）：

 1  public static ChildControl FindVisualChild<ChildControl>(this DependencyObject DependencyObj)
 2                  where ChildControl : DependencyObject
 3         {
 4             for (int i = 0; i < VisualTreeHelper.GetChildrenCount(DependencyObj); i++)
 5             {
 6                 DependencyObject Child = VisualTreeHelper.GetChild(DependencyObj, i);
 7 
 8                 if (Child != null && Child is ChildControl)
 9                 {
10                     return (ChildControl)Child;
11                 }
12                 else
13                 {
14                     ChildControl ChildOfChild = FindVisualChild<ChildControl>(Child);
15 
16                     if (ChildOfChild != null)
17                     {
18                         return ChildOfChild;
19                     }
20                 }
21             }
22 
23             return null;
24         }

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此方法可获取指定Name属性的子控件（一般用于获取容器控件中已知Name属性的子控件）：

 1         public static T GetNamedDescendantOfType<T>(this DependencyObject start, string name) where T : FrameworkElement
 2         {
 3             var descendants = start.GetDescendants();
 4             if (descendants != null)
 5             {
 6                 foreach (FrameworkElement d in descendants)
 7                 {
 8                     if (d.Name.Equals(name))
 9                         return d as T;
10                 }
11             }
12 
13             return null;
14         }
15 
16         public static IEnumerable<DependencyObject> GetDescendants(this DependencyObject start)
17         {
18             var queue = new Queue<DependencyObject>();
19             var count = VisualTreeHelper.GetChildrenCount(start);
20 
21             for (int i = 0; i < count; i++)
22             {
23                 var child = VisualTreeHelper.GetChild(start, i);
24                 yield return child;
25                 queue.Enqueue(child);
26             }
27 
28             while (queue.Count > 0)
29             {
30                 var parent = queue.Dequeue();
31                 var count2 = VisualTreeHelper.GetChildrenCount(parent);
32 
33                 for (int i = 0; i < count2; i++)
34                 {
35                     var child = VisualTreeHelper.GetChild(parent, i);
36                     yield return child;
37                     queue.Enqueue(child);
38                 }
39             }
40         }

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