在WPF中，如何在ComboBox中将ItemSource和SelectedItem与String绑定？ [英] In WPF, how to bind the ItemSource and SelectedItem with String in ComboBox?

问题描述

在XAML中：

 <   ComboBox     x：Uid   =  ComboBox_1    ItemsSource   =  {Binding Path = Companies}    SelectedItem   =  {Binding Path = Company}  /  >  

在ViewModel中：

public ObservableCollection< string>公司{得到;私人集; }

public string Company {get;私人集; }



我将在ViewModel构造函数中将单个公司添加到公司列表



但它没有'工作



整个XAML都会崩溃。



不知道为什么....

解决方案

1。你绑定的SelectedItem不应该有私有集。



示例解决方案：



ViewModel：

公共类CMainWindowViewModel 
 {
 public ObservableCollection <   string  > 公司{get;私人集; } 
 
 
 public string Company {get;组; } 
 
 
公共CMainWindowViewModel（）
 {
公司=新的ObservableCollection <   string  > （）; 
 Companies.Add（TestString）; 
} 
} 

样本视图：

 <  网格 >  
 <   ComboBox     x：Uid   =  ComboBox_1    ItemsSource   =  {Binding Path = Companies}    SelectedItem   =  {Binding Path = Company}  /  >  
 <   / Grid  >  

In XAML:

<ComboBox x:Uid="ComboBox_1" ItemsSource="{Binding Path=Companies}" SelectedItem="{Binding Path=Company}"/>

In ViewModel:
public ObservableCollection<string> Companies { get; private set; }
public string Company{ get; private set; }

And I will add the single Company to Companies list in ViewModel constructor

But it doesn't work

the whole XAML will crash.

Not sure why....

解决方案

1. The SelectedItem where you bind should not have a private set.

Sample Solution:

ViewModel:

public class CMainWindowViewModel
 {
     public ObservableCollection<string> Companies { get; private set; }


     public string Company { get;  set; }


     public CMainWindowViewModel()
     {
         Companies = new ObservableCollection<string>();
         Companies.Add("TestString");
     }
 }

Sample View:

<Grid>
    <ComboBox x:Uid="ComboBox_1" ItemsSource="{Binding Path=Companies}" SelectedItem="{Binding Path=Company}"/>
</Grid>

这篇关于在WPF中，如何在ComboBox中将ItemSource和SelectedItem与String绑定？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！