Uwp Autosuggestbox OrderBy Displaymemberpath答案

【问题标题】：Uwp Autosuggestbox OrderBy DisplaymemberpathUwp Autosuggestbox OrderBy Displaymemberpath
【发布时间】：2020-10-02 11:25:23
【问题描述】：

我的 autosuggestbox 有一个行为，我必须按升序对所有建议的列表项进行排序，并且此行为将应用于整个应用程序中的一种常见 AutoSuggestBox 样式。当我尝试简单地使用对象本身进行排序时，它工作得很好，因为这些项目只是一个字符串列表。但是，当项目是对象列表，并且我想使用 1 个特定属性进行排序时，它对我不起作用。我正在使用 DisplayMemberPath 告诉它应该查找哪个属性。下面是我尝试过的代码：

行为

public class AutoSuggestSortBehavior : IBehavior
{
    public void Attach(DependencyObject associatedObject) => ((AutoSuggestBox) associatedObject).TextChanged += AutoSuggestSortBehavior_TextChanged;

    private void AutoSuggestSortBehavior_TextChanged(AutoSuggestBox sender, AutoSuggestBoxTextChangedEventArgs args)
    {
        var autoSuggestBox = sender;
        if(autoSuggestBox?.Items?.Count > 0 && args.Reason == AutoSuggestionBoxTextChangeReason.UserInput && !string.IsNullOrWhiteSpace(sender.Text))
        {
            if (!string.IsNullOrWhiteSpace(autoSuggestBox.DisplayMemberPath))
            {
                autoSuggestBox.ItemsSource = autoSuggestBox.Items.ToList().OrderBy(x => x.GetType().GetProperty(autoSuggestBox.DisplayMemberPath).Name).ToList();
            }
            else
            {
                autoSuggestBox.ItemsSource = autoSuggestBox.Items.ToList().OrderBy(x => x).ToList();
            }
        }            
    }
    public void Detach(DependencyObject associatedObject) => ((AutoSuggestBox) associatedObject).TextChanged -= AutoSuggestSortBehavior_TextChanged;
}

Xaml

<AutoSuggestBox
    Header="AutoSuggest"
    QueryIcon="Find"
    Text="With text, header and icon"
    TextChanged="AutoSuggestBox_TextChanged" />
<AutoSuggestBox
    DisplayMemberPath="Name"
    Header="AutoSuggest2"
    QueryIcon="Find"
    Text="With text, header and icon"
    TextChanged="AutoSuggestBox_TextChanged2" />

TextChanged 事件

private void AutoSuggestBox_TextChanged(AutoSuggestBox sender, AutoSuggestBoxTextChangedEventArgs args)
    {
        var abcc = new List<string>();
        abcc.Add("xyz");
        abcc.Add("321");
        abcc.Add("123");
        abcc.Add("lopmjk");
        abcc.Add("acb");
        sender.ItemsSource = abcc;
    }

    private void AutoSuggestBox_TextChanged2(AutoSuggestBox sender, AutoSuggestBoxTextChangedEventArgs args)
    {
        var persons = new List<Person>();
        persons.Add(new Person { Name = "xyz", count = 1 });
        persons.Add(new Person { Name = "321", count = 2 });
        persons.Add(new Person { Name = "123", count = 3 });
        persons.Add(new Person { Name = "lopmjk", count = 4 });
        persons.Add(new Person { Name = "acb", count = 5 });
        sender.ItemsSource = persons;
    }

【问题讨论】：

标签： c# xaml uwp sql-order-by textchanged

【解决方案1】：

所以我通过一个小实验找到了解决方案，我们可以使用 GetValue() 方法并传入对象本身，然后它按预期工作：

autoSuggestBox.ItemsSource = autoSuggestBox.Items.ToList().OrderBy(x => x.GetType().GetProperty(autoSuggestBox.DisplayMemberPath).GetValue(x)).ToList();

【讨论】：