假设我只有几个单选按钮和一些自定义对象作为数据源.
举个例子
public enum SomeModeType
{
firstMode = 10,
secondMode = 20,
thirdMode = 30
}
public class MyCustomObject:INotifyPropertyChanged
{
private SomeModeType _mode;
public SomeModeType Mode
{
set { _mode = value; }
get { return _mode; }
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
var handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
如何使用以下方式将此对象属性(如果可能)绑定到3个不同的单选按钮:
如果单选按钮被选中-对象属性模式设置为firstMode
如果选中单选按钮-对象属性模式设置为secondMode
如果单选按钮三被选中-对象属性模式设置为thirdMode
等
还是更好地为此使用事件?
附言
我知道如何使用事件,但是它不知所措,无法按事件创建事件,例如rb1chnaged,rb2changed,…,rb100changed,不是吗?
P.P.S.
圣诞快乐!
解决方法:
对于枚举的每个值,您需要创建一个RadioButton并将其Checked值绑定到数据源的Mode属性.然后,您需要使用Binding的Format和Parse事件将Mode值转换为Checked属性的合适值,反之亦然.
示例-使用FlowLayoutPanel的单选按钮列表
例如,将FlowLayoutPanel控件放在表单上,然后在Form的Load事件中编写以下代码.该代码将动态地将RadioButton控件添加到流布局面板中并执行数据绑定:
var enumValues = Enum.GetValues(typeof(SomeModeType)).Cast<object>()
.Select(x => new { Value = x, Name = x.ToString() }).ToList();
enumValues.ForEach(x =>
{
var radio = new RadioButton() { Text = x.Name, Tag = x.Value };
var binding = radio.DataBindings.Add("Checked", dataSource,
"Mode", true, DataSourceUpdateMode.OnPropertyChanged);
binding.Format += (obj, ea) =>
{ ea.Value = ((Binding)obj).Control.Tag.Equals(ea.Value); };
binding.Parse += (obj, ea) =>
{ if ((bool)ea.Value == true) ea.Value = ((Binding)obj).Control.Tag; };
flowLayoutPanel1.Controls.Add(radio);
});
在以上示例中,数据源可以是MyCustomObject或BindingList< MyCustomObject>.或包含List< MyCustomObject>的BindingSource.在其数据源中.
另一种选择-使用Owner-draw ListBox的RadioButton List
作为另一个选择,您可以使用所有者绘制的ListBox并为项目渲染RadioButton.这样,您可以将ListBox的SelectedValue绑定到对象的Mode属性.以下代码中的dataSourcs可以类似于上面的示例.将一个列表框放在窗体上,并在窗体的Load事件中编写以下代码:
var enumValues = Enum.GetValues(typeof(SomeModeType)).Cast<object>()
.Select(x => new { Value = x, Name = x.ToString() }).ToList();
this.listBox1.DataSource = enumValues;
this.listBox1.ValueMember = "Value";
this.listBox1.DisplayMember = "Name";
this.listBox1.DataBindings.Add("SelectedValue", dataSource,
"Mode", true, DataSourceUpdateMode.OnPropertyChanged);
this.listBox1.DrawMode = DrawMode.OwnerDrawFixed;
this.listBox1.ItemHeight = RadioButtonRenderer.GetGlyphSize(
Graphics.FromHwnd(IntPtr.Zero),
RadioButtonState.CheckedNormal).Height + 4;
this.listBox1.DrawItem += (obj, ea) =>
{
var lb = (ListBox)obj;
ea.DrawBackground();
var text = lb.GetItemText(lb.Items[ea.Index]);
var r = ea.Bounds;
r.Offset(ea.Bounds.Height, 0);
RadioButtonRenderer.DrawRadioButton(ea.Graphics,
new Point(ea.Bounds.Location.X, ea.Bounds.Location.Y + 2), r, text,
lb.Font, TextFormatFlags.Left, false,
(ea.State & DrawItemState.Selected) == DrawItemState.Selected ?
RadioButtonState.CheckedNormal : RadioButtonState.UncheckedNormal);
};
屏幕截图
您可以在下图中看到两个解决方案:
var list = new List<MyCustomObject>() {
new MyCustomObject(){ Mode= SomeModeType.firstMode},
new MyCustomObject(){ Mode= SomeModeType.secondMode},
new MyCustomObject(){ Mode= SomeModeType.thirdMode},
};
this.myCustomObjectBindingSource.DataSource = list;
var dataSource = myCustomObjectBindingSource;
注意
回答此问题后,我在以下文章中创建并共享了RadioButtonList控件:WinForms RadioButtonList doesn’t exist.
它具有数据绑定支持,您可以像ListBox一样使用此控件.为此,将其绑定到模型的属性就足够了,然后只需通过以下方式设置控件的数据源即可:
radioButtonList1.DataSource = Enum.GetValues(typeof(YourEnumType));