WinForms RadioButtonList不存在？

Question

我知道WebForms有一个RadioButtonList控件,但我找不到一个WinForms.我需要的是将3个RadioButton组合在一起,这样一次只能选择1个.我发现我必须通过代码执行此操作,这很痛苦.我只是没有看到RadioButtonList某个地方,或者它真的不存在WinForms？

Answer 1

如果你只想组合单选按钮,它就足以将它们放在一个容器中,那么它们就像一个组一样,但是如果你需要数据绑定,就像一个ComboBox或ListBox多个CheckedListBox工作,你需要一个RadioButtonList控件.

Windows窗体没有内置RadioButtonList控件.您可以通过派生表单ListBox并使其自己绘制并自己绘制单选按钮来创建自己的控件.这也是CheckedListBox创建的方式.

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,你可以这样简单地使用它:

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

或者例如对于一个enum,简单地这样:

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

在下面的图像中,RadioButtonList通过设置禁用第二个Enabled = false;:

此外,控件也支持从右到左:

它还支持多列:

单选按钮列表

这是控制的源代码.通过使用ListBox/不使用数据绑定添加项目或设置数据源,您可以像平常一样使用它:

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; }
    }
}

Answer 2

显然不是.

您可以使用GroupBox或Panel 将三个RadioButton组合在一起,如此处所示.