我希望能够将列表绑定到列表框数据源,并且在修改列表时,列表框的UI会自动更新. (
Winforms不是ASP).
这是一个示例：
这是一个示例：
private List<Foo> fooList = new List<Foo>();
private void Form1_Load(object sender,EventArgs e)
{
//Add first Foo in fooList
Foo foo1 = new Foo("bar1");
fooList.Add(foo1);
//Bind fooList to the listBox
listBox1.DataSource = fooList;
//I can see bar1 in the listBox as expected
}
private void button1_Click(object sender,EventArgs e)
{
//Add anthoter Foo in fooList
Foo foo2 = new Foo("bar2");
fooList.Add(foo2);
//I expect the listBox UI to be updated thanks to INotifyPropertyChanged,but it's not
}
class Foo : INotifyPropertyChanged
{
private string bar_ ;
public string Bar
{
get { return bar_; }
set
{
bar_ = value;
NotifyPropertyChanged("Bar");
}
}
public Foo(string bar)
{
this.Bar = bar;
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string info)
{
if (PropertyChanged != null)
{
PropertyChanged(this,new PropertyChangedEventArgs(info));
}
}
public override string ToString()
{
return bar_;
}
}
如果我替换List< Foo> fooList = new List< Foo>();通过BindingList< Foo> fooList = new BindingList< Foo>();然后它工作.但我不想改变原来的傻瓜式.我希望这样的工作：listBox1.DataSource = new BindingList< Foo>(fooList);
编辑：我还在这里阅读来自Ilia Jerebtsov的List<T> vs BindingList<T> Advantages/DisAdvantages：“当你将BindingSource的DataSource设置为List<>时,它会在内部创建一个BindingList来包装你的列表”.我想我的样本只是证明了这不是真的：我的列表<>似乎没有内部包装到BindingList<>中.
解决方法
你的例子中没有
BindingSource.
您需要像这样修改它以使用BindingSource
var bs = new BindingSource();
Foo foo1 = new Foo("bar1");
fooList.Add(foo1);
bs.DataSource = fooList; //<-- point of interrest
//Bind fooList to the listBox
listBox1.DataSource = bs; //<-- notes it takes the entire bindingSource
编辑
请注意(正如评论中指出的那样) – bindingsource不能与INotifyPropertyChanged一起使用
