WinForms数据绑定

我是数据绑定中的新成员。

我有这些类：

public class Foo : List<Bar>
{
    public string FooName { get; set; }
}

public class Bar
{
    public string BarName { get; set; }
    public string BarDesc { get; set; }
}

我有一个List<Foo>

我想在ComboBox有Foo项目，在ListBox Bar项目。 当我在ComboBox更改所选项目时，我想要更改ListBox 。 当我更改ListBox TextBox选定项目时，我想让TextBox填充BarDesc 。

以下仅适用于ListBox和ComboBox ：

comboBox1.DataSource = foos;
comboBox1.DisplayMember = "FooName";
listBox1.DataBindings.Add("DataSource", foos, "");
listBox1.DisplayMember = "BarName";

我现在不会如何将ListBox选定Bar绑定到TextBox.Text属性。 也许为listBox1添加绑定不是一个好主意。

也许我应该这样做：

((CurrencyManager)listBox1.BindingContext[foos]).CurrentChanged += new EventHandler((o, a) =>
{
    textBox1.DataBindings.Clear();
    textBox1.DataBindings.Add("Text", listBox1.DataSource, "BarDesc");
});

我该如何解决我的问题？

---

为了完成所有这些工作，我必须将Items属性添加到Foo类中。 这是两个绑定源之间的“链接/关系”。

public partial class Form1 : Form {
    public class Foo : List<Bar> {
        public string FooName { get; set; }
        public Foo(string name) { this.FooName = name; }
        public List<Bar> Items { get { return this; } }
    }
    public class Bar {
        public string BarName { get; set; }
        public string BarDesc { get; set; }
        public Bar(string name, string desc) {
            this.BarName = name;
            this.BarDesc = desc;
        }
    }
    public Form1() {

        InitializeComponent();

        List<Foo> foos = new List<Foo>();

        Foo a = new Foo("letters");
        a.Add(new Bar("a", "aaa"));
        a.Add(new Bar("b", "bbb"));
        foos.Add(a);

        Foo b = new Foo("digits");
        b.Add(new Bar("1", "111"));
        b.Add(new Bar("2", "222"));
        b.Add(new Bar("3", "333"));
        foos.Add(b);

        //Simple Related Object List Binding
        //http://blogs.msdn.com/bethmassi/archive/2007/04/21/simple-related-object-list-binding.aspx

        BindingSource comboBoxBindingSource = new BindingSource();
        BindingSource listBoxBindingSource = new BindingSource();

        comboBoxBindingSource.DataSource = foos;
        listBoxBindingSource.DataSource = comboBoxBindingSource;
        listBoxBindingSource.DataMember = "Items";

        comboBox1.DataSource = comboBoxBindingSource;
        comboBox1.DisplayMember = "FooName";

        listBox1.DataSource = listBoxBindingSource;
        listBox1.DisplayMember = "BarName";

        textBox1.DataBindings.Add("Text", listBoxBindingSource, "BarDesc");

    }
}

---

使用BindingSource满足您所有复杂的数据绑定需求：

// bind to List<Foo>
BindingSource comboBoxBindingSource = new BindingSource();
comboBoxBindingSource.DataSource = foos;
// use this binding source in comboBox1
// for display use FooName
comboBox1.DataSource = comboBoxBindingSource;
comboBox1.DisplayMember = "FooName";

// bind to comboBox1's SelectedValue
// it will point to the Foo selected in combobox
BindingSource listBoxBindingSource = new BindingSource();
listBoxBindingSource.DataSource = comboBox1;
listBoxBindingSource.DataMember = "SelectedValue";
// use this binding source in listBox1
// for display use BarName
listBox1.DataSource = listBoxBindingSource;
listBox1.DisplayMember = "BarName";

// bind to comboBox'1s SelectedValue (reusing listBoxBindingSource)
// and set Text to value of BarDesc
textBox1.DataBindings.Add("Text", listBoxBindingSource, "BarDesc");

---

你应该在组合和列表框上设置ValueMember。 您可能还需要处理bindingSource.CurrentChanged并将列表框重新绑定到当前选定的列表。

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