如何将 WPF ComboBox 绑定到 XAML 中的 List<Objects>？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/42422427/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I bind a WPF ComboBox to a List<Objects> in XAML?
提问by JohnB
I'm having issues binding a WPF ComboBox in XAML.
我在 XAML 中绑定 WPF ComboBox 时遇到问题。
Here is my object definition and collection:
这是我的对象定义和集合：
public class AccountManager
{
public long UserCode { get; set; }
public string UserName { get; set; }
}
public partial class MainWindow : Window
{
public List<AccountManager> AccountManagers;
}
Here is the XAML definition of my ComboBox:
这是我的 ComboBox 的 XAML 定义：
ComboBox Name="cbTestAccountManagers"
ItemsSource="{Binding AccountManagers}"
DisplayMemberPath="UserName"
SelectedValuePath="UserCode"
Width="250"
I'm not quite sure what I'm doing wrong here. I don't get any errors at run/load time. The ComboBox displays without any contents in the drop down. (It's empty).
我不太确定我在这里做错了什么。我在运行/加载时没有收到任何错误。ComboBox 在下拉列表中不显示任何内容。（它是空的）。
Can someone point me in the right direction?
有人可以指出我正确的方向吗？
Thanks
谢谢
采纳答案by Noah Reinagel
Your problem is simple. Change
你的问题很简单。改变
public List<AccountManager> AccountManagers;
to this
对此
public List<AccountManager> AccountManagers { get; set; }
and make sure that you have these in your MainWindow constructor
并确保您的 MainWindow 构造函数中有这些
public MainWindow()
{
InitializeComponent();
//Setup Account managers here
DataContext = this;
}
you can only bind to properties not fields and you need to ensure the proper data context
您只能绑定到属性而不是字段，并且您需要确保正确的数据上下文
回答by MikeT
your making a couple of mistakes
你犯了几个错误
firstly you're not following MVVM
首先你没有关注 MVVM
the correct MVVM should look as follows
正确的 MVVM 应如下所示
public class AccountManager
{
public long UserCode { get; set; }
public string UserName { get; set; }
}
public class AccountManagersVM
{
public ObservableCollection<AccountManager> AccountManagers{ get; set; }
}
then no need for changes to the code behind you just need to use the DataContext which can be set directly or via a binding
那么不需要更改背后的代码只需要使用可以直接或通过绑定设置的 DataContext
<Window.DataContext>
<local:AccountManagersVM />
</Window.DataContext>
ComboBox ItemsSource="{Binding AccountManagers}"
DisplayMemberPath="UserName"
SelectedValuePath="UserCode"
Width="250"
Second attributes/fields can't be bound only properties
第二个属性/字段不能只绑定属性
eg public long UserCode { get; set; }will work but public long UserCode;wont
例如public long UserCode { get; set; }会工作但public long UserCode;不会
