C# WinForms RadioButtonList 不存在？

WinForms RadioButtonList doesn't exist?

提问by Ryan Abbott

I know that WebFormshas a RadioButtonListcontrol, but I can't find one for WinForms. What I need is to have 3 RadioButtons grouped together, so that only 1 can be selected at a time. I'm finding that I have to do this through code, which is a pain. Am I just not seeing RadioButtonListsomewhere, or does it really not exist in WinForms?

我知道WebForms有一个RadioButtonList控件，但我找不到WinForms. 我需要的是将 3 个 RadioButtons 组合在一起，以便一次只能选择 1 个。我发现我必须通过代码来做到这一点，这很痛苦。我只是没有看到RadioButtonList某个地方，还是真的不存在WinForms？

采纳答案by Matthew Jones

Apparently not.

显然不是。

You can group three RadioButtons together using a GroupBox or a Panel as is done here.

您可以使用 GroupBox 或 Panel将三个 RadioButton 组合在一起，就像这里所做的那样。

回答by Thomas Levesque

The simple fact that several radio buttons are in the same container makes them mutually exclusive, you don't have to code this behavior yourself. Just put them in a Panel or GroupBox as suggested by Matthew

多个单选按钮位于同一个容器中的简单事实使它们相互排斥，您不必自己编写此行为的代码。只需按照 Matthew 的建议将它们放在 Panel 或 GroupBox 中

回答by Reza Aghaei

If you just want to group radio buttons, it's enough to put them in a container, then they will act like a group, but if you need data-binding like how a ComboBoxor ListBoxor CheckedListBoxworks, you need a RadioButtonListcontrol.

如果你只是想对单选按钮进行分组，把它们放在一个容器中就足够了，那么它们就会像一个组一样工作，但是如果你需要像 a ComboBoxorListBox或 or 一样CheckedListBox工作的数据绑定，你需要一个RadioButtonList控件。

Windows forms doesn't have a built-in RadioButtonListcontrol. You can create your own control by deriving form ListBoxand making it owner-draw and draw radio buttons yourself. This is the way which CheckedListBoxis created as well.

Windows 窗体没有内置RadioButtonList控件。您可以通过派生表单ListBox并使其成为所有者绘制和自己绘制单选按钮来创建自己的控件。这也是CheckedListBox创造的方式。

This way, the control supports data-binding and will benefit from all features of ListBox, including DataSource, SelectedValue, DisplayMember, ValueMemberand so on. For example you can simply use it this way:

这样一来，该控件支持数据绑定和将所有的功能中获益ListBox，其中包括DataSource，SelectedValue，DisplayMember，ValueMember等等。例如，您可以简单地以这种方式使用它：

this.radioButtonList1.DataSource = peopleTable; 
this.radioButtonList1.DisplayMember = "Name"; 
this.radioButtonList1.ValueMember= "Id";

Or for example for an enum, simply this way:

或者例如对于 a enum，只需这样：

this.radioButtonList1.DataSource = Enum.GetValues(typeof(DayOfWeek)); 

In below image, the second RadioButtonListis disabled by setting Enabled = false;:

在下图中，RadioButtonList通过设置禁用第二个Enabled = false;：

Also the control supports right to left as well:

控件也支持从右到左：

It also supports multi column:

它还支持多列：

RadioButtonList

单选按钮列表

Here is the source code for control. You can use it like a normal ListBoxby adding items or setting data source with/without using data-binding:

这是控制的源代码。您可以ListBox通过添加项目或使用/不使用数据绑定设置数据源来像正常使用它一样使用它：

using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
public class RadioButtonList : ListBox
{
    Size s;
    public RadioButtonList()
    {
        this.DrawMode = DrawMode.OwnerDrawFixed;
        using (var g = Graphics.FromHwnd(IntPtr.Zero))
            s = RadioButtonRenderer.GetGlyphSize(
                Graphics.FromHwnd(IntPtr.Zero), RadioButtonState.CheckedNormal);
    }
    protected override void OnDrawItem(DrawItemEventArgs e)
    {

        var text = (Items.Count > 0) ? GetItemText(Items[e.Index]) : Name;
        Rectangle r = e.Bounds; Point p;
        var flags = TextFormatFlags.Default | TextFormatFlags.NoPrefix;
        var selected = (e.State & DrawItemState.Selected) == DrawItemState.Selected;
        var state = selected ?
            (Enabled ? RadioButtonState.CheckedNormal : 
                       RadioButtonState.CheckedDisabled) :
            (Enabled ? RadioButtonState.UncheckedNormal : 
                       RadioButtonState.UncheckedDisabled);
        if (RightToLeft == System.Windows.Forms.RightToLeft.Yes)
        {
            p = new Point(r.Right - r.Height + (ItemHeight - s.Width) / 2,
                r.Top + (ItemHeight - s.Height) / 2);
            r = new Rectangle(r.Left, r.Top, r.Width - r.Height, r.Height);
            flags |= TextFormatFlags.RightToLeft | TextFormatFlags.Right;
        }
        else
        {
            p = new Point(r.Left + (ItemHeight - s.Width) / 2,
            r.Top + (ItemHeight - s.Height) / 2);
            r = new Rectangle(r.Left + r.Height, r.Top, r.Width - r.Height, r.Height);
        }
        var bc = selected ? (Enabled ? SystemColors.Highlight : 
            SystemColors.InactiveBorder) : BackColor;
        var fc = selected ? (Enabled ? SystemColors.HighlightText : 
            SystemColors.GrayText) : ForeColor;
        using (var b = new SolidBrush(bc))
            e.Graphics.FillRectangle(b, e.Bounds);
        RadioButtonRenderer.DrawRadioButton(e.Graphics, p, state);
        TextRenderer.DrawText(e.Graphics, text, Font, r, fc, bc, flags);
        e.DrawFocusRectangle();
        base.OnDrawItem(e);
    }
    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never),
    DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public override SelectionMode SelectionMode
    {
        get { return System.Windows.Forms.SelectionMode.One; }
        set { }
    }
    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never),
    DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public override int ItemHeight
    {
        get { return (this.Font.Height + 2); }
        set { }
    }
    [EditorBrowsable(EditorBrowsableState.Never), Browsable(false),
    DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public override DrawMode DrawMode
    {
        get { return base.DrawMode; }
        set { base.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawFixed; }
    }
}