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
I found that the line, VisualTreeHelper.GetChildrenCount(depObj);, used in several examples above does not return a non-zero count for GroupBoxes, in particular, where the GroupBox contains a Grid, and the Grid contains children elements. I believe this may be because the GroupBox is not allowed to contain more than one child, and this is stored in its Content property. There is no GroupBox.Children type of property. I am sure I did not do this very efficiently, but I modified the first "FindVisualChildren" example in this chain as follows:
public IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
{
if (depObj != null)
{
int depObjCount = VisualTreeHelper.GetChildrenCount(depObj);
for (int i = 0; i <depObjCount; i++)
{
DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
if (child != null && child is T)
{
yield return (T)child;
}
if (child is GroupBox)
{
GroupBox gb = child as GroupBox;
Object gpchild = gb.Content;
if (gpchild is T)
{
yield return (T)child;
child = gpchild as T;
}
}
foreach (T childOfChild in FindVisualChildren<T>(child))
{
yield return childOfChild;
}
}
}
}
其他回答
接受的答案返回发现的元素或多或少是无序的,方法是尽可能深入地跟随第一个子分支,同时在返回和重复尚未解析的树枝的步骤之前,沿途生成发现的元素。
如果你需要按降序排列的后代元素,其中直接的子元素将首先产生,然后是它们的子元素,依此类推,下面的算法将工作:
public static IEnumerable<T> GetVisualDescendants<T>(DependencyObject parent, bool applyTemplates = false)
where T : DependencyObject
{
if (parent == null || !(child is Visual || child is Visual3D))
yield break;
var descendants = new Queue<DependencyObject>();
descendants.Enqueue(parent);
while (descendants.Count > 0)
{
var currentDescendant = descendants.Dequeue();
if (applyTemplates)
(currentDescendant as FrameworkElement)?.ApplyTemplate();
for (var i = 0; i < VisualTreeHelper.GetChildrenCount(currentDescendant); i++)
{
var child = VisualTreeHelper.GetChild(currentDescendant, i);
if (child is Visual || child is Visual3D)
descendants.Enqueue(child);
if (child is T foundObject)
yield return foundObject;
}
}
}
生成的元素将从最近到最远进行排序。 这将是有用的,例如,如果你正在寻找某种类型和条件的最近的子元素:
var foundElement = GetDescendants<StackPanel>(someElement)
.FirstOrDefault(o => o.SomeProperty == SomeState);
I found that the line, VisualTreeHelper.GetChildrenCount(depObj);, used in several examples above does not return a non-zero count for GroupBoxes, in particular, where the GroupBox contains a Grid, and the Grid contains children elements. I believe this may be because the GroupBox is not allowed to contain more than one child, and this is stored in its Content property. There is no GroupBox.Children type of property. I am sure I did not do this very efficiently, but I modified the first "FindVisualChildren" example in this chain as follows:
public IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
{
if (depObj != null)
{
int depObjCount = VisualTreeHelper.GetChildrenCount(depObj);
for (int i = 0; i <depObjCount; i++)
{
DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
if (child != null && child is T)
{
yield return (T)child;
}
if (child is GroupBox)
{
GroupBox gb = child as GroupBox;
Object gpchild = gb.Content;
if (gpchild is T)
{
yield return (T)child;
child = gpchild as T;
}
}
foreach (T childOfChild in FindVisualChildren<T>(child))
{
yield return childOfChild;
}
}
}
}
请注意,使用VisualTreeHelper仅适用于派生自Visual或Visual3D的控件。如果你还需要检查其他元素(例如TextBlock, FlowDocument等),使用VisualTreeHelper将抛出一个异常。
如果有必要,这里有一个回到逻辑树的替代方案:
http://www.hardcodet.net/2009/06/finding-elements-in-wpf-tree-both-ways
@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
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
}
}
};