c# - 如何用外部文本文件填充文本框并在此之后向其中添加单词

Question

我正在尝试用外部文本文件中的数据填充 visual studio 2012 文本框，此后，当您执行该程序时，您应该能够将更改写入此文本框并将它们保存在那里，但我得到了错误，如屏幕截图所示。此外，我在虚拟机上运行 Windows 8!

[截图]:http://i.imgur.com/NkZU38C.png "截图

下面是填充文本框的代码:

private void Page_Loaded(object sender, RoutedEventArgs e)
    {
        LoadWords(@"Assets\AdminPageKS1words.txt");

    }

    async private void LoadWords(string filename)
    {
        var wordList = new List<String>();
        // this method reads line separated words from a text file and populates a List object // 
        Windows.Storage.StorageFolder localFolder = Windows.ApplicationModel.Package.Current.InstalledLocation;
        // begin the file read operation 
        try
        {
            // open and read in the word list into an object called words 

            StorageFile sampleFile = await localFolder.GetFileAsync(filename);
            var words = await FileIO.ReadLinesAsync(sampleFile);
            // add each word returned to a list of words declared 
            // globally as List wordList = new List();
            foreach (var word in words) 
            { 
                wordList.Add(word); 
            }
            List1.ItemsSource = wordList;
        }
        catch (Exception)
        {
            // handle any errors with reading the file
        } 

这里是保存按钮的代码:

async private void SaveButton_Click(object sender, RoutedEventArgs e)
    {

 // locate the local storage folder on the device
  Windows.Storage.StorageFolder localFolder = Windows.Storage.ApplicationData.Current.LocalFolder;

// create a new text file in the local folder called “File.txt”
StorageFile sampleFile = await localFolder.CreateFileAsync("File.txt",CreationCollisionOption.ReplaceExisting);

// write text to the file just created – text comes from a textblock called wordlistBox
await FileIO.WriteTextAsync(sampleFile, List1.Text); 

 // display a message saying that file is saved.
messageLabel.Text = keystage + "File saved";

    }

    public string keystage { get; set; }

Answer 1

如错误消息所述，List1(TextBox)没有 ItemsSource 属性。它有一个 Text属性(property)。

但这不是唯一的问题。因为你的 wordList 对象是一个 IList。因此，您需要将其转换为纯字符串。

一个解决方案是这样做:

List1.Text = string.Join(Environment.NewLine, wordlist);

这会将所有行连接在一起，中间有换行符。

还要确保您的文本框配置正确 AcceptsReturn设置为 true 以便显示换行符。