WPF建议文本框

时间:2018-08-04 10:54:24

标签: c# wpf mvvm autocomplete

我构建了一个WPF文本框,用于检查其内容是否有效。现在我想实现提出建议的可能性。但是不像互联网上出现的带有建议列表的示例。我正在寻找一个通过选择TextBox来做到这一点的示例,


如果有我可以查询的特定名称或您知道的任何示例代码,请告诉我。

2 个答案:

答案 0 :(得分:2)

在与WPF进行了很多斗争之后,我有一个概念证明可以为您服务:

MainWindow.xaml

<Window x:Class="Solutions.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"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <TextBox VerticalAlignment="Center" HorizontalAlignment="Center" x:Name="SuggestionBox" Width="200"
                 />
    </Grid>
</Window>

MainWindow.xaml.cs:

using System.Linq;
using System.Windows;
using System.Windows.Controls;

namespace Solutions
{
    public partial class MainWindow : Window
    {
        private static readonly string[] SuggestionValues = {
            "England",
            "USA",
            "France",
            "Estonia"
        };

        public MainWindow()
        {
            InitializeComponent();
            SuggestionBox.TextChanged += SuggestionBoxOnTextChanged;
        }

        private string _currentInput = "";
        private string _currentSuggestion = "";
        private string _currentText = "";

        private int _selectionStart;
        private int _selectionLength;
        private void SuggestionBoxOnTextChanged(object sender, TextChangedEventArgs e)
        {
            var input = SuggestionBox.Text;
            if (input.Length > _currentInput.Length && input != _currentSuggestion)
            {
                _currentSuggestion = SuggestionValues.FirstOrDefault(x => x.StartsWith(input));
                if (_currentSuggestion != null)
                {
                    _currentText = _currentSuggestion;
                    _selectionStart = input.Length;
                    _selectionLength = _currentSuggestion.Length - input.Length;

                    SuggestionBox.Text = _currentText;
                    SuggestionBox.Select(_selectionStart, _selectionLength);
                }
            }
            _currentInput = input;
        }
    }
}

下一步是将其转换为用户控件,因此您可以通过绑定设置建议,但是可以进行处理。

答案 1 :(得分:1)

您可以通过稍微修改here中的解决方案来使用水印(尤其是仅xaml的答案确实很简短)。只需将水印文本设置为您的第一个建议。然后,您可以添加一些功能,例如在后面的代码中按退格键时删除建议。