我有一个WPF窗口,其中包含多个用户控件,其中一些是不可见的(可见性=隐藏)。这些控件之一具有一个具有ItemsSource绑定的ComboBox,我想在加载窗口/控件时预设其选定的项目。
但是,似乎直到组合框可见时才应用绑定。当我去设置SelectedItem属性并在调试器中遇到一个断点时,我注意到那时ItemsSource为null。有没有办法强迫WPF应用数据绑定并在组合框保持不可见的情况下填充组合框?
可复制的示例:
MainWindow.xaml
<Window x:Class="HiddenComboBoxBinding.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:HiddenComboBoxBinding"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Border x:Name="comboboxParent" Visibility="Collapsed">
<ComboBox x:Name="cmbSearchType" SelectedIndex="0" ItemsSource="{Binding SearchTypeOptions}" DisplayMemberPath="Name" SelectionChanged="cmbSearchType_SelectionChanged" />
</Border>
</Grid>
</Window>
MainWindow.xaml.cs
using System.Linq;
using System.Windows;
using System.Windows.Controls;
namespace HiddenComboBoxBinding
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private ViewModel viewModel { get; set; } = new ViewModel();
public MainWindow()
{
InitializeComponent();
this.DataContext = viewModel;
// Add some or all of our search types - in the real code, there's some business logic here
foreach (var searchType in SearchType.AllSearchTypes)
{
viewModel.SearchTypeOptions.Add(searchType);
}
// Pre-select the last option, which should be "Bar"
cmbSearchType.SelectedItem = SearchType.AllSearchTypes.Last();
}
private void cmbSearchType_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
}
}
}
ViewModel.cs
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace HiddenComboBoxBinding
{
public class ViewModel : INotifyPropertyChanged
{
public ObservableCollection<SearchType> SearchTypeOptions { get; set; } = new ObservableCollection<SearchType>();
#region INotifyPropertyChanged Members
private void NotifyPropertyChanged(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); }
public event PropertyChangedEventHandler PropertyChanged;
#endregion
}
public class SearchType
{
// Source list of Search Types
private static List<SearchType> _AllSearchTypes;
public static List<SearchType> AllSearchTypes
{
get
{
if(_AllSearchTypes == null)
{
_AllSearchTypes = new List<SearchType>();
_AllSearchTypes.Add(new SearchType() { Name = "Foo" });
_AllSearchTypes.Add(new SearchType() { Name = "Bar" });
}
return _AllSearchTypes;
}
}
// Instance properties - for the purposes of a minimal, complete, verifiable example, just one property
public string Name { get; set; }
}
}
答案 0 :(得分:0)
我能够找出问题所在。设置SelectedItem实际上确实有效(即使那时ItemsSource为null),但是在XAML中,ComboBox的SelectedIndex =“ 0”优先于在后面的代码中设置的SelectedItem。