Answers:
这是您的另一个选择。我通过创建一个示例应用程序对其进行了测试，然后将一个GroupBox和一个GroupBox放入初始GroupBox中。在嵌套的GroupBox中，我放置了3个TextBox控件和一个按钮。这是我使用的代码（甚至包括您正在寻找的递归）
public IEnumerable<Control> GetAll(Control control,Type type)
{
var controls = control.Controls.Cast<Control>();
return controls.SelectMany(ctrl => GetAll(ctrl,type))
.Concat(controls)
.Where(c => c.GetType() == type);
}
为了在表单加载事件中对其进行测试，我希望对初始GroupBox内的所有控件进行计数
private void Form1_Load(object sender, EventArgs e)
{
var c = GetAll(this,typeof(TextBox));
MessageBox.Show("Total Controls: " + c.Count());
}
并且每次都返回正确的计数，因此我认为这将完全适合您要查找的内容:)
在C＃中（因为您已经对其进行了标记），您可以使用如下LINQ表达式：
List<Control> c = Controls.OfType<TextBox>().Cast<Control>().ToList();编辑递归：
在此示例中，您首先创建控件列表，然后调用一个方法来填充它。由于该方法是递归的，因此它不返回列表，而只是对其进行更新。
List<Control> ControlList = new List<Control>();
private void GetAllControls(Control container)
{
foreach (Control c in container.Controls)
{
GetAllControls(c);
if (c is TextBox) ControlList.Add(c);
}
}
Descendants尽管我不太熟悉，但是使用该函数可以在一个LINQ语句中执行此操作。有关更多信息，请参见此页面。
编辑2以返回集合：
正如@ProfK所建议的那样，仅返回所需控件的方法可能是更好的做法。为了说明这一点，我将代码修改如下：
private IEnumerable<Control> GetAllTextBoxControls(Control container)
{
List<Control> controlList = new List<Control>();
foreach (Control c in container.Controls)
{
controlList.AddRange(GetAllTextBoxControls(c));
if (c is TextBox)
controlList.Add(c);
}
return controlList;
}
这是递归GetAllControls（）的改进版本，它实际上可用于私有var：
private void Test()
{
List<Control> allTextboxes = GetAllControls(this);
}
private List<Control> GetAllControls(Control container, List<Control> list)
{
foreach (Control c in container.Controls)
{
if (c is TextBox) list.Add(c);
if (c.Controls.Count > 0)
list = GetAllControls(c, list);
}
return list;
}
private List<Control> GetAllControls(Control container)
{
return GetAllControls(container, new List<Control>());
}我将许多先前的想法组合成一个扩展方法。这样做的好处是，您将获得正确键入的可枚举的返回值，并且继承由正确处理OfType()。
public static IEnumerable<T> FindAllChildrenByType<T>(this Control control)
{
IEnumerable<Control> controls = control.Controls.Cast<Control>();
return controls
.OfType<T>()
.Concat<T>(controls.SelectMany<Control, T>(ctrl => FindAllChildrenByType<T>(ctrl)));
}您可以使用LINQ查询来执行此操作。这将查询形式为TextBox的所有内容
var c = from controls in this.Controls.OfType<TextBox>()
select controls;var c = this.Controls.OfType<TextBox>()得到相同的结果？
它可能是古老的技术，但是却像魅力一样。我使用了递归来更改控件所有标签的颜色。效果很好。
internal static void changeControlColour(Control f, Color color)
{
foreach (Control c in f.Controls)
{
// MessageBox.Show(c.GetType().ToString());
if (c.HasChildren)
{
changeControlColour(c, color);
}
else
if (c is Label)
{
Label lll = (Label)c;
lll.ForeColor = color;
}
}
}我想修改PsychoCoders的答案：由于用户希望获得某种类型的所有控件，我们可以通过以下方式使用泛型：
public IEnumerable<T> FindControls<T>(Control control) where T : Control
{
// we can't cast here because some controls in here will most likely not be <T>
var controls = control.Controls.Cast<Control>();
return controls.SelectMany(ctrl => FindControls<T>(ctrl))
.Concat(controls)
.Where(c => c.GetType() == typeof(T)).Cast<T>();
}这样，我们可以如下调用该函数：
private void Form1_Load(object sender, EventArgs e)
{
var c = FindControls<TextBox>(this);
MessageBox.Show("Total Controls: " + c.Count());
}.OfType<T>()Linq方法不是比.Where(c => c.GetType() == typeof(T)).Cast<T>();获得相同的效果更有效吗？
不要忘记，您也可以在容器控件之外的其他控件中也有一个TextBox 。您甚至可以将TextBox添加到PictureBox。
所以你还需要检查
someControl.HasChildren = True在任何递归函数中。
这是我从布局中测试此代码的结果：
TextBox13 Parent = Panel5
TextBox12 Parent = Panel5
TextBox9 Parent = Panel2
TextBox8 Parent = Panel2
TextBox16 Parent = Panel6
TextBox15 Parent = Panel6
TextBox14 Parent = Panel6
TextBox10 Parent = Panel3
TextBox11 Parent = Panel4
TextBox7 Parent = Panel1
TextBox6 Parent = Panel1
TextBox5 Parent = Panel1
TextBox4 Parent = Form1
TextBox3 Parent = Form1
TextBox2 Parent = Form1
TextBox1 Parent = Form1
tbTest Parent = myPicBox尝试在窗体上使用一个Button和一个RichTextBox。
Option Strict On
Option Explicit On
Option Infer Off
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim pb As New PictureBox
pb.Name = "myPicBox"
pb.BackColor = Color.Goldenrod
pb.Size = New Size(100, 100)
pb.Location = New Point(0, 0)
Dim tb As New TextBox
tb.Name = "tbTest"
pb.Controls.Add(tb)
Me.Controls.Add(pb)
Dim textBoxList As New List(Of Control)
textBoxList = GetAllControls(Of TextBox)(Me)
Dim sb As New System.Text.StringBuilder
For index As Integer = 0 To textBoxList.Count - 1
sb.Append(textBoxList.Item(index).Name & " Parent = " & textBoxList.Item(index).Parent.Name & System.Environment.NewLine)
Next
RichTextBox1.Text = sb.ToString
End Sub
Private Function GetAllControls(Of T)(ByVal searchWithin As Control) As List(Of Control)
Dim returnList As New List(Of Control)
If searchWithin.HasChildren = True Then
For Each ctrl As Control In searchWithin.Controls
If TypeOf ctrl Is T Then
returnList.Add(ctrl)
End If
returnList.AddRange(GetAllControls(Of T)(ctrl))
Next
ElseIf searchWithin.HasChildren = False Then
For Each ctrl As Control In searchWithin.Controls
If TypeOf ctrl Is T Then
returnList.Add(ctrl)
End If
returnList.AddRange(GetAllControls(Of T)(ctrl))
Next
End If
Return returnList
End Function
End Class使用反射：
// Return a list with all the private fields with the same type
List<T> GetAllControlsWithTypeFromControl<T>(Control parentControl)
{
List<T> retValue = new List<T>();
System.Reflection.FieldInfo[] fields = parentControl.GetType().GetFields(System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
foreach (System.Reflection.FieldInfo field in fields)
{
if (field.FieldType == typeof(T))
retValue.Add((T)field.GetValue(parentControl));
}
}
List<TextBox> ctrls = GetAllControlsWithTypeFromControl<TextBox>(this);这是我的扩展方法Control，使用LINQ作为@PsychoCoder版本的改编：
它使用一个类型列表，而不是允许您不需要多次调用就GetAll可以获取所需的类型。我目前将其用作过载版本。
public static IEnumerable<Control> GetAll(this Control control, IEnumerable<Type> filteringTypes)
{
var ctrls = control.Controls.Cast<Control>();
return ctrls.SelectMany(ctrl => GetAll(ctrl, filteringTypes))
.Concat(ctrls)
.Where(ctl => filteringTypes.Any(t => ctl.GetType() == t));
}用法：
// The types you want to select
var typeToBeSelected = new List<Type>
{
typeof(TextBox)
, typeof(MaskedTextBox)
, typeof(Button)
};
// Only one call
var allControls = MyControlThatContainsOtherControls.GetAll(typeToBeSelected);
// Do something with it
foreach(var ctrl in allControls)
{
ctrl.Enabled = true;
}干净简单的解决方案（C＃）：
static class Utilities {
public static List<T> GetAllControls<T>(this Control container) where T : Control {
List<T> controls = new List<T>();
if (container.Controls.Count > 0) {
controls.AddRange(container.Controls.OfType<T>());
foreach (Control c in container.Controls) {
controls.AddRange(c.GetAllControls<T>());
}
}
return controls;
}
}获取所有文本框：
List<TextBox> textboxes = myControl.GetAllControls<TextBox>();您可以使用以下代码
public static class ExtensionMethods
{
public static IEnumerable<T> GetAll<T>(this Control control)
{
var controls = control.Controls.Cast<Control>();
return controls.SelectMany(ctrl => ctrl.GetAll<T>())
.Concat(controls.OfType<T>());
}
}这是我的扩展方法。这非常有效，而且很懒。
用法：
var checkBoxes = tableLayoutPanel1.FindChildControlsOfType<CheckBox>();
foreach (var checkBox in checkBoxes)
{
checkBox.Checked = false;
}代码是：
public static IEnumerable<TControl> FindChildControlsOfType<TControl>(this Control control) where TControl : Control
{
foreach (var childControl in control.Controls.Cast<Control>())
{
if (childControl.GetType() == typeof(TControl))
{
yield return (TControl)childControl;
}
else
{
foreach (var next in FindChildControlsOfType<TControl>(childControl))
{
yield return next;
}
}
}
}public List<Control> GetAllChildControls(Control Root, Type FilterType = null)
{
List<Control> AllChilds = new List<Control>();
foreach (Control ctl in Root.Controls) {
if (FilterType != null) {
if (ctl.GetType == FilterType) {
AllChilds.Add(ctl);
}
} else {
AllChilds.Add(ctl);
}
if (ctl.HasChildren) {
GetAllChildControls(ctl, FilterType);
}
}
return AllChilds;
}我从@PsychoCoder修改。现在可以找到所有控件（包括嵌套控件）。
public static IEnumerable<T> GetChildrens<T>(Control control)
{
var type = typeof (T);
var allControls = GetAllChildrens(control);
return allControls.Where(c => c.GetType() == type).Cast<T>();
}
private static IEnumerable<Control> GetAllChildrens(Control control)
{
var controls = control.Controls.Cast<Control>();
return controls.SelectMany(c => GetAllChildrens(c))
.Concat(controls);
}这可能起作用：
Public Function getControls(Of T)() As List(Of T)
Dim st As New Stack(Of Control)
Dim ctl As Control
Dim li As New List(Of T)
st.Push(Me)
While st.Count > 0
ctl = st.Pop
For Each c In ctl.Controls
st.Push(CType(c, Control))
If c.GetType Is GetType(T) Then
li.Add(CType(c, T))
End If
Next
End While
Return li
End Function我认为获取您正在讨论的所有控件的功能仅对WPF可用。
这是一个经过测试且可以正常工作的通用解决方案：
我有大量的UpDownNumeric控件，其中一些在主窗体中，一些在窗体内的组框中。我只希望最后一个选择的控件将后颜色更改为绿色，为此我首先将所有其他控件设置为白色，使用此方法：（也可以扩展为孙代）
public void setAllUpDnBackColorWhite()
{
//To set the numericUpDown background color of the selected control to white:
//and then the last selected control will change to green.
foreach (Control cont in this.Controls)
{
if (cont.HasChildren)
{
foreach (Control contChild in cont.Controls)
if (contChild.GetType() == typeof(NumericUpDown))
contChild.BackColor = Color.White;
}
if (cont.GetType() == typeof(NumericUpDown))
cont.BackColor = Color.White;
}
} 您可以尝试以下方法：)
private void ClearControls(Control.ControlCollection c)
{
foreach (Control control in c)
{
if (control.HasChildren)
{
ClearControls(control.Controls);
}
else
{
if (control is TextBox)
{
TextBox txt = (TextBox)control;
txt.Clear();
}
if (control is ComboBox)
{
ComboBox cmb = (ComboBox)control;
if (cmb.Items.Count > 0)
cmb.SelectedIndex = -1;
}
if (control is CheckBox)
{
CheckBox chk = (CheckBox)control;
chk.Checked = false;
}
if (control is RadioButton)
{
RadioButton rdo = (RadioButton)control;
rdo.Checked = false;
}
if (control is ListBox)
{
ListBox listBox = (ListBox)control;
listBox.ClearSelected();
}
}
}
}
private void btnClear_Click(object sender, EventArgs e)
{
ClearControls((ControlCollection)this.Controls);
}尽管其他几个用户发布了适当的解决方案，但我想发布一种更通用的方法，该方法可能更有用。
这很大程度上是基于耶顿的反应。
public static IEnumerable<Control> AllControls(
this Control control,
Func<Control, Boolean> filter = null)
{
if (control == null)
throw new ArgumentNullException("control");
if (filter == null)
filter = (c => true);
var list = new List<Control>();
foreach (Control c in control.Controls) {
list.AddRange(AllControls(c, filter));
if (filter(c))
list.Add(c);
}
return list;
} public IEnumerable<T> GetAll<T>(Control control) where T : Control
{
var type = typeof(T);
var controls = control.Controls.Cast<Control>().ToArray();
foreach (var c in controls.SelectMany(GetAll<T>).Concat(controls))
if (c.GetType() == type) yield return (T)c;
}对于正在寻找亚当的C＃代码的VB版本作为Control该类的扩展编写的任何人：
''' <summary>Collects child controls of the specified type or base type within the passed control.</summary>
''' <typeparam name="T">The type of child controls to include. Restricted to objects of type Control.</typeparam>
''' <param name="Parent">Required. The parent form control.</param>
''' <returns>An object of type IEnumerable(Of T) containing the control collection.</returns>
''' <remarks>This method recursively calls itself passing child controls as the parent control.</remarks>
<Extension()>
Public Function [GetControls](Of T As Control)(
ByVal Parent As Control) As IEnumerable(Of T)
Dim oControls As IEnumerable(Of Control) = Parent.Controls.Cast(Of Control)()
Return oControls.SelectMany(Function(c) GetControls(Of T)(c)).Concat(oControls.Where(Function(c) c.GetType() Is GetType(T) Or c.GetType().BaseType Is GetType(T))
End Function注意：我BaseType为任何派生的自定义控件添加了匹配项。您可以删除它，甚至可以将其设为可选参数。
用法
Dim oButtons As IEnumerable(Of Button) = Me.GetControls(Of Button)()创建方法
public static IEnumerable<Control> GetControlsOfType<T>(Control control)
{
var controls = control.Controls.Cast<Control>();
return controls.SelectMany(ctrl => GetControlsOfType<T>(ctrl)).Concat(controls).Where(c => c is T);
}并像
Var controls= GetControlsOfType<TextBox>(this);//You can replace this with your control我使用VB很好，所以我写了一个扩展方法。检索控件的所有子级和子级子级
Imports System.Runtime.CompilerServices
Module ControlExt
<Extension()>
Public Function GetAllChildren(Of T As Control)(parentControl As Control) As IEnumerable(Of T)
Dim controls = parentControl.Controls.Cast(Of Control)
Return controls.SelectMany(Of Control)(Function(ctrl) _
GetAllChildren(Of T)(ctrl)) _
.Concat(controls) _
.Where(Function(ctrl) ctrl.GetType() = GetType(T)) _
.Cast(Of T)
End Function
End Module然后就可以使用它了，其中“ btnList”是一个控件
btnList.GetAllChildren(Of HtmlInputRadioButton).FirstOrDefault(Function(rb) rb.Checked)在这种情况下，它将选择选定的单选按钮。
只是：
For Each ctrl In Me.Controls.OfType(Of Button)()
ctrl.Text = "Hello World!"
Next