如何在组框中获得选中的单选按钮？ [复制]

Question

我在组框中有很多单选按钮。通常我会使用If radiobutton1.Checked = True Then单独检查每个单选按钮。

但我认为也许有一种聪明的方法可以检查在组框中选中了哪个单选按钮。有什么想法吗？

Answer 1

试试这个

Dim rButton As RadioButton = 
        GroupBox1.Controls
       .OfType(Of RadioButton)
       .FirstOrDefault(Function(r) r.Checked = True)

这将在 GroupBox 中返回 Checked RadioButton

请注意，这是一个 LINQ 查询，您必须拥有

Imports System.Linq

如果您不这样做，您的 IDE/编译器可能会指出 OfType 不是 System.Windows.Forms.Control.ControlCollection 的成员

Answer 2

如果您将它们（例如 Load 事件）添加到列表中，您可以使用 LINQ：

Dim checkedRadioButton as RadioButton
checkedRadioButton = 
    radioButtonList.FirstOrDefault(Function(radioButton) radioButton.Checked))

这应该没问题，因为最多检查一个。

编辑 更好的是：只需查询 GroupBox 的 Controls 集合：

Dim checkedRadioButton as RadioButton
checkedRadioButton = 
    groupBox.Controls.OfType(Of RadioButton)().FirstOrDefault(Function(radioButton) radioButton.Checked))

请注意，如果 Groupbox 中没有 RadioButtons，这将导致问题！

Answer 3

'returns which radio button is selected within GroupBox passed
Private Function WhatRadioIsSelected(ByVal grp As GroupBox) As String
    Dim rbtn As RadioButton
    Dim rbtnName As String = String.Empty
    Try
        Dim ctl As Control
        For Each ctl In grp.Controls
            If TypeOf ctl Is RadioButton Then
                rbtn = DirectCast(ctl, RadioButton)
                If rbtn.Checked Then
                    rbtnName = rbtn.Name
                    Exit For
                End If
            End If
        Next
    Catch ex As Exception
        Dim stackframe As New Diagnostics.StackFrame(1)
        Throw New Exception("An error occurred in routine, '" & stackframe.GetMethod.ReflectedType.Name & "." & System.Reflection.MethodInfo.GetCurrentMethod.Name & "'." & Environment.NewLine & "  Message was: '" & ex.Message & "'")
    End Try
    Return rbtnName
End Function

Answer 4

我知道它被标记为 vb.net 但这是一个 c# 示例

var checkedButton = GroupBox1.Controls.OfType<RadioButton>()
                                      .FirstOrDefault(rb => rb.Checked);

Answer 5

这是一个带有四个单选按钮的组合框的测试程序。

Public Class Form1

    Private Sub Form1_Shown(sender As Object, _
                            e As System.EventArgs) Handles Me.Shown
        RadioButton1.Tag = New Action(AddressOf rb1Action)
        RadioButton2.Tag = New Action(AddressOf rb2Action)
        RadioButton3.Tag = New Action(AddressOf rb3Action)
        RadioButton4.Tag = New Action(AddressOf rb4Action)
    End Sub

    Private Sub rb1Action()
        Debug.WriteLine("1 " & RadioButton1.Checked)
    End Sub

    Private Sub rb2Action()
        Debug.WriteLine("2 " & RadioButton2.Checked)
    End Sub

    Private Sub rb3Action()
        Debug.WriteLine("3 " & RadioButton3.Checked)
    End Sub

    Private Sub rb4Action()
        Debug.WriteLine("4 " & RadioButton4.Checked)
    End Sub

    Private Sub RadioButton_CheckedChanged(sender As System.Object, _
                                            e As System.EventArgs) Handles _
                                        RadioButton1.CheckedChanged, _
                                        RadioButton2.CheckedChanged, _
                                        RadioButton3.CheckedChanged, _
                                        RadioButton4.CheckedChanged

        Dim aRadioButton As RadioButton = DirectCast(sender, RadioButton)
        If aRadioButton.Checked Then
            Dim rbAct As Action = DirectCast(aRadioButton.Tag, Action)
            rbAct.Invoke()
        End If
    End Sub
End Class

Answer 6

您可以运行一个 foreach 循环来迭代控件的扫描 GroupBox内的RadioButton，所以使用Control，见下例。

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    'RadioButton checked
    Dim ceckedRadioButton As Integer = 0
    'Total RadioButton on GroupBox
    Dim totalRadioButton As Integer = 0

    'Iteration and check RadioButton selected
    For Each myControl As RadioButton In Me.GroupBox1.Controls.OfType(Of RadioButton)()
        'If RadioButton is checked
        If myControl.Checked Then
            'increases variable ceckedRadioButton
            ceckedRadioButton += 1
        End If

        'increases variable totalRadioButton
        totalRadioButton += 1
    Next

    If ceckedRadioButton > 0 Then
        'RadioButon show how many are selected
        MessageBox.Show("Were selected" & " " & ceckedRadioButton.ToString & " " & "RadioButton on" & " " & totalRadioButton.ToString)
    Else
        'No selected RadioButton
        MessageBox.Show("No selected RadioButton")
    End If
End Sub

再见

Answer 7

我有一个简单又容易的

For Each b As RadioButton In GroupBox1.Controls.OfType(Of RadioButton)()
        If b.Checked = True Then
            MsgBox("I hope that will help you")
        End If
    Next

Answer 8

有 3 个 RadioButton：RadioButton1、RadioButton2 和 RadioButton3

'A handler for the click event of the 3 buttons is created
Private Sub Radios_Click(sender As Object, e As EventArgs) Handles RadioButton1.Click, RadioButton2.Click, RadioButton3.Click
    Dim rb As RadioButton
    rb = sender
    MsgBox(rb.Name) 'Displays the name of the selected control or that he was made the click
End Sub

Answer 9

我从表格中的项目名称创建了三个单选按钮。我还为此创建了一个事件处理程序。现在，当我尝试在 msgbox 中通过其文本值检查哪个按钮时。它显示了正确的名称，但 msgbox 弹出两次以供选择。我使用的是 VB.net 2012。

Private Sub iButton_checked(ByVal sender As System.Object, ByVal e As System.EventArgs)
    For Each b As RadioButton In grpgodown.Controls.OfType(Of RadioButton)()
        If b.Checked = True Then
            MsgBox(b.Text)
        End If
    Next
End Sub

Answer 10

Private Sub BTN_OK_Click(sender As Object, e As EventArgs) Handles BTN_OK.Click

    For Each Ctrl In GroupBox1.Controls
        If Ctrl.checked Then MsgBox(Ctrl.text) 'for show select RadioButton Check
    Next

Answer 11

Select Case True
    RadioButton1.checked
        'Do this action for Rad1
    RadioButton2.checked
        'Do this action for Rad2
    RadioButton3.checked
        'Do this action for rad3
End Select