Question

我一直在做一些研究，基本上是空洞的。我认为这可能很容易理解，但远远超出我目前的知识。这是关于两个文本框。

我想拥有它所以我可以在searchText框中搜索一个单词，翻译的文本将出现在searchResults文本框中。（xml文件位于https://www.dropbox.com/s/jgw84kqj2k1bwq1/JapaneseEnglishData.xml?dl=0。但是，帖子的底部是它的一个示例）。有没有人对如何实现这一目标有任何见解？

<Window x:Class="BeginnersJapanese.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <XmlDataProvider x:Key="XmlData"
                   Source="https://www.dropbox.com/s/jgw84kqj2k1bwq1/JapaneseEnglishData.xml?dl=1"
                   XPath="WordList/Word"/>
    </Window.Resources>
    <Grid>
        <ListBox ItemsSource="{Binding Source={StaticResource XmlData}}" DisplayMemberPath="English" HorizontalAlignment="Left" Height="299" Margin="10,10,0,0" VerticalAlignment="Top" Width="179"/>
        <TextBox Name="searchBox" HorizontalAlignment="Left" Height="23" Margin="256,41,0,0" TextWrapping="Wrap" Text="{Binding Path=WordList/Word,BindsDirectlyToSource=True}" VerticalAlignment="Top" Width="142"/>
        <Label Content="SearchBox" HorizontalAlignment="Left" Margin="287,10,0,0" VerticalAlignment="Top"/>
        <Button Content="Search" Name="searchButton" HorizontalAlignment="Left" Margin="256,207,0,0" VerticalAlignment="Top" Width="142" Height="36" Click="searchButton_Click"/>
        <Button Content="Speak" Name="speakButton" HorizontalAlignment="Left" Margin="256,273,0,0" VerticalAlignment="Top" Width="142" Height="36" Click="speakButton_Click"/>
        <TextBox Name="searchResult" HorizontalAlignment="Left" Height="23" Margin="256,162,0,0" TextWrapping="Wrap" Text="{Binding Path=searchBox}" IsReadOnly="True" VerticalAlignment="Top" Width="142"/>

    </Grid>
</Window>

XML文件的示例。

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!--This is a generated XML File-->
<WordList>
  <Word>
    <English>Me</English>
    <Romaji>boku</Romaji>
    <Kanji>ぼく</Kanji>
  </Word>
  <Word>
    <English>I</English>
    <Romaji>boku</Romaji>
    <Kanji>ぼく</Kanji>
  </Word>
</WordList>

Answer 1

您需要设置窗口或网格的DataContext才能使绑定生效。This可能会有所帮助。

像这样：

<Window
  xmlns:local="clr-namespace:MyNamespace"
 Window>
<Window.Resources>
  <local:MyClass x:Key="MyClass">
</Window.Resources>
<Grid DataContext={StaticResource MyClass}>
  ...

MyClass的实现：

public class MyClass : INotifyPropertyChanged
{
  private string _wordlist;
  private string _searchBox;

  public string WordList
  {
    get
    {
      return _wordlist;
    }
    set
    {
      _wordlist = value;
      RaisePropertyChanged("WordList");
    }
  }

  public string searchBox
  {
    get
    {
      return _searchBox;
    }
    set
    {
      _searchBox= value;
      RaisePropertyChanged("searchBox");
    }
  }

  public event PropertyChangedEventHandler PropertyChanged;

  private void RaisePropertyChanged(string propertyName)
  {
    if(PropertyChanged != null)
      PropertyChanged(this, propertyName);
  }
}

您可能需要在setter中使用一些额外的逻辑来使用XML进行翻译。另外，将TextBoxes的UpdateSourceTrigger设置为PropertyChanged：

 <TextBox Text={Binding Path=WordList, UpdatesourceTrigger=PropertyChanged} ... />
 <TextBox Text={Binding Path=searchBox, UpdateSourceTrigger=PropertyChanged} ... />

我希望这可以让您了解如何获得理想的行为。

带有XML文件的DataBinding文本框

1 个答案: