我正在寻找一种方法,通过它们的类型在窗口上找到所有控件,
例如:找到所有的文本框,找到所有实现特定界面的控件等。
我正在寻找一种方法,通过它们的类型在窗口上找到所有控件,
例如:找到所有的文本框,找到所有实现特定界面的控件等。
当前回答
使用帮助类VisualTreeHelper或LogicalTreeHelper,这取决于你对哪棵树感兴趣。它们都提供了获取元素的子元素的方法(尽管语法略有不同)。我经常使用这些类来查找特定类型的第一个出现,但你可以很容易地修改它来查找该类型的所有对象:
public static DependencyObject FindInVisualTreeDown(DependencyObject obj, Type type)
{
if (obj != null)
{
if (obj.GetType() == type)
{
return obj;
}
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
DependencyObject childReturn = FindInVisualTreeDown(VisualTreeHelper.GetChild(obj, i), type);
if (childReturn != null)
{
return childReturn;
}
}
}
return null;
}
其他回答
下面是另一个紧凑的版本,使用泛型语法:
public static IEnumerable<T> FindLogicalChildren<T>(DependencyObject obj) where T : DependencyObject
{
if (obj != null) {
if (obj is T)
yield return obj as T;
foreach (DependencyObject child in LogicalTreeHelper.GetChildren(obj).OfType<DependencyObject>())
foreach (T c in FindLogicalChildren<T>(child))
yield return c;
}
}
我根据@Mathias Lykkegaard Lorenzen的建议改编了@Bryce Kahle的回答,并使用了LogicalTreeHelper。
看起来还行。;)
public static IEnumerable<T> FindLogicalChildren<T> ( DependencyObject depObj ) where T : DependencyObject
{
if( depObj != null )
{
foreach( object rawChild in LogicalTreeHelper.GetChildren( depObj ) )
{
if( rawChild is DependencyObject )
{
DependencyObject child = (DependencyObject)rawChild;
if( child is T )
{
yield return (T)child;
}
foreach( T childOfChild in FindLogicalChildren<T>( child ) )
{
yield return childOfChild;
}
}
}
}
}
(它仍然不会检查@Benjamin Berry和@David R分别提到的组框中的选项卡控件或网格。) (也遵循@noonand的建议&删除多余的子!= null)
对于这个和更多的用例,你可以添加流动扩展方法到你的库:
public static List<DependencyObject> FindAllChildren(this DependencyObject dpo, Predicate<DependencyObject> predicate)
{
var results = new List<DependencyObject>();
if (predicate == null)
return results;
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dpo); i++)
{
var child = VisualTreeHelper.GetChild(dpo, i);
if (predicate(child))
results.Add(child);
var subChildren = child.FindAllChildren(predicate);
results.AddRange(subChildren);
}
return results;
}
举个例子:
var children = dpObject.FindAllChildren(child => child is TextBox);
这应该可以达到目的:
public static IEnumerable<T> FindVisualChilds<T>(DependencyObject depObj) where T : DependencyObject
{
if (depObj == null) yield return (T)Enumerable.Empty<T>();
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
{
DependencyObject ithChild = VisualTreeHelper.GetChild(depObj, i);
if (ithChild == null) continue;
if (ithChild is T t) yield return t;
foreach (T childOfChild in FindVisualChilds<T>(ithChild)) yield return childOfChild;
}
}
然后像这样枚举控件
foreach (TextBlock tb in FindVisualChildren<TextBlock>(window))
{
// do something with tb here
}
对递归做了一点小小的改变,例如,你可以找到一个标签控件的子标签控件。
public static DependencyObject FindInVisualTreeDown(DependencyObject obj, Type type)
{
if (obj != null)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(obj, i);
if (child.GetType() == type)
{
return child;
}
DependencyObject childReturn = FindInVisualTreeDown(child, type);
if (childReturn != null)
{
return childReturn;
}
}
}
return null;
}