列表框,实现相同的接口不同对象的列表 [英] ListBox, list of different objects implementing the same interface
问题描述
我有两个对象:用户和客户端,既实现了接口IMember
I have two objects: User and Client, both implements interface IMember
interface IMember
{
int Id { get; set; }
string Name { get; set; }
}
在一个表格我设定ListBox的数据源:
In a form I set ListBox data source:
myListBox.DisplayMember = "Name";
myListBox.ValueMember = "Id";
myListBox.DataSource = membersList; // List<IMember>
和奇怪的事情发生;)当我运行程序的第一个对象,whichis类型用户的,正确地显示(阿德里安塞拉芬)等物,都是至极联系人类型显示是这样的:
And wierd things happen ;) When I run program the first object, whichis type of User, displays correctly (Adrian Serafin) and other objects, wich are type of Contact are displayed like this:
MyProject.Client#20
MyProject.Client#40
作为显示是的ToString()调用它们。
as for display was ToString() call on them.
我无法通过实现相同的接口列表框中的不同数据源对象的列表,或者我做了一些在这里搞错?
I can't using list of different objects implementing the same interface as datasource in ListBox or I made some mistake here?
推荐答案
您确定是列表< IMember>
,而不是的ArrayList
?这使得一个很大的区别,作为一个非的存在 - 对象
公共索引(公共SOMETYPE这个[INT] {获取;设置;}
)使得大的区别。以下工作正常:
Are you sure it is List<IMember>
, and not ArrayList
? This makes a big difference, as the existence of a non-object
public indexer (public SomeType this[int] {get;set;}
) makes a big difference. The following works fine:
using System;
using System.Collections.Generic;
using System.Windows.Forms;
interface IMember
{
int Id { get; set; }
string Name { get; set; }
}
class Foo : IMember
{
public int Id { get; set; }
public string Name { get; set; }
}
class Bar : IMember
{ // explicit, why not...
int IMember.Id { get; set; }
string IMember.Name { get; set; }
}
static class Program
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
IMember bar = new Bar();
bar.Id = 2;
bar.Name = "def";
var list = new List<IMember> {
new Foo { Id = 1, Name = "abc"},
bar,
};
Application.Run(new Form
{
Controls = {
new ListBox {
Dock = DockStyle.Fill,
DisplayMember = "Name",
ValueMember = "Id",
DataSource = list
}
}
});
}
}
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