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
这是最简单的方法:
IEnumerable<myType> collection = control.Children.OfType<myType>();
其中控件是窗口的根元素。
编辑-正如评论中指出的那样。这只是一个层次的深度。查看一个更深入的选项的公认答案。
其他回答
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
}
@Bryce,回答得很好。
VB。净版:
Public Shared Iterator Function FindVisualChildren(Of T As DependencyObject)(depObj As DependencyObject) As IEnumerable(Of T)
If depObj IsNot Nothing Then
For i As Integer = 0 To VisualTreeHelper.GetChildrenCount(depObj) - 1
Dim child As DependencyObject = VisualTreeHelper.GetChild(depObj, i)
If child IsNot Nothing AndAlso TypeOf child Is T Then
Yield DirectCast(child, T)
End If
For Each childOfChild As T In FindVisualChildren(Of T)(child)
Yield childOfChild
Next
Next
End If
End Function
用法(这将禁用窗口中的所有文本框):
For Each tb As TextBox In FindVisualChildren(Of TextBox)(Me)
tb.IsEnabled = False
Next
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;
}
}
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);
我发现没有Visual Tree Helpers更容易:
foreach (UIElement element in MainWindow.Children) {
if (element is TextBox) {
if ((element as TextBox).Text != "")
{
//Do something
}
}
};