Question

我在一个文件中写了一个Datetime字符串，然后尝试将其读回，但字符串返回交错的零字符。 WP电动工具显示字符串完整＆＃34; 18.02.2015 12：08：17＆＃34;。但阅读后看起来像：＆＃34; 1 \ 08 \ 0. \ 00 \ 02 \ 0. \ 02 \ 00 \ 01 \ 05 \ 0 \ 01 \ 02 \ 0：\ 00 \ 08 \ 0：\ 01 \ 07 \ 0＆＃34;

await FileExtensions.WriteDataToFileAsync("scheduleDateTime.txt", scheduleTime);

var contents = await FileExtensions.ReadFileContentsAsync("scheduleDateTime.txt");


public static async Task<String> ReadFileContentsAsync(string fileName)
{            
    StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;

    if (local != null)
    {
        var file = await local.OpenStreamForReadAsync(fileName);
        using (StreamReader streamReader = new StreamReader(file))
        {
            return streamReader.ReadToEnd();
        }
    }
    else
    {
        return String.Empty;
    }
}

public static async Task WriteDataToFileAsync(string fileName, string content)
{
    byte[] data = Encoding.Unicode.GetBytes(content);

    var folder = ApplicationData.Current.LocalFolder;
    var file = await folder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);

    using (var s = await file.OpenStreamForWriteAsync())
    {
        await s.WriteAsync(data, 0, data.Length);
    }
}

Answer 1

您使用UTF-16编码保存文件，但使用默认编码（即UTF-8）将其读回。您需要对两种情况使用相同的编码。

通常，建议使用UTF-8来读写文件，因此您需要更改WriteDataToFileAsync方法：

public static async Task WriteDataToFileAsync(string fileName, string content)
{
    byte[] data = Encoding.UTF8.GetBytes(content);

    var folder = ApplicationData.Current.LocalFolder;
    var file = await folder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);

    using (var s = await file.OpenStreamForWriteAsync())
    {
        await s.WriteAsync(data, 0, data.Length);
    }
}

Windows Phone 8.0从IsolatedStorage读取文件

1 个答案: