无法写入 Windows Phone 中的文本文件

Question

好的，所以我需要用 c# 写入家庭网络上的文本文件。问题是我不能对 System.IO.File 使用任何东西，因为 Windows Phone 不支持它。我正在尝试使用 System.IO.StreamWriter，但这会造成问题。

System.IO.StreamWriter ow;
ow = new System.IO.StreamWriter(@"\RASPBERRYPI\pi\led.txt");

据我所知，上面写着：

"Cannot convert from string to System.IO.Stream"

我一直在寻找这个问题的答案，但似乎没有人遇到这个问题。

Answer 1

using System.IO;
using(StreamWriter sw = new StreamWriter("Text.txt"))
{
    sw.WriteLine("bla");
}

试试这个。

Answer 2

阅读 StreamWriter documentation for Windows phone；它需要 System.IO.Stream，而不是 string，并且没有 System.IO.string.

这样的东西

如果你真的可以写一个路径（如果你不能签出isolated storage）你可以这样做：

using (var fs = new FileStream(@"\RASPBERRYPI\pi\led.txt", FileMode.CreateNew)
using (var writer = new StreamWriter(fs))
{
    writer.Write(textToAdd);
}

Answer 3

我做了一个小例子来说明写作（和阅读）。这是我的 xaml:

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="3*"/>
        <RowDefinition Height="*"/>
        <RowDefinition Height="3*"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>

    <RichEditBox Name="inputTxtBx" Margin="10" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" 
                 AcceptsReturn="True"/>
    <Button Grid.Row="1" Name="write" VerticalAlignment="Center" HorizontalAlignment="Center" Content="Write"
            Click="write_Click"/>
    <TextBlock Name="outputTxtBlk" Grid.Row="2" Margin="10" VerticalAlignment="Stretch" 
               Style="{StaticResource BodyTextBlockStyle}"/>
    <Grid Grid.Row="3" HorizontalAlignment="Stretch">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Button Grid.Column="0" Name="read" VerticalAlignment="Center" HorizontalAlignment="Center" 
                Content="Read" Click="read_Click" Margin="5"/>
        <Button Grid.Column="1" Name="delete" VerticalAlignment="Center" HorizontalAlignment="Center" 
                Content="Delete" Click="delete_Click" Margin="5"/>
    </Grid>
</Grid>

这是说明在 windows phone:

上读取和写入文件的代码

private async void write_Click(object sender, RoutedEventArgs e)
{
    await WriteToFile();
}

private StorageFile file;
private async Task WriteToFile()
{
    // Create a new file named "outputFile.txt"
    file = await ApplicationData.Current.LocalFolder.CreateFileAsync("outputFile.txt", CreationCollisionOption.OpenIfExists);

    // Get the string in inputBx
    string toWrite;
    inputTxtBx.Document.GetText(TextGetOptions.AdjustCrlf, out toWrite);

    // Write the data from the textbox
    using(var stream = await file.OpenStreamForWriteAsync())
    {
        using(var writer = new StreamWriter(stream))
        {
            await writer.WriteAsync(toWrite);
        }
    }

    inputTxtBx.Document.SetText(TextSetOptions.ApplyRtfDocumentDefaults, "");
}

private async void read_Click(object sender, RoutedEventArgs e)
{
    if(file == null)
    {
        outputTxtBlk.Text = "You have to write first!";
    }
    else
    {
        // Read the data from disk
        using(var stream = await file.OpenStreamForReadAsync())
        {
            using(var reader = new StreamReader(stream))
            {
                outputTxtBlk.Text = await reader.ReadToEndAsync();
            }
        }
    }
}

private async void delete_Click(object sender, RoutedEventArgs e)
{
    if(file == null)
    {
        outputTxtBlk.Text = "You have to write first!";
    }
    else
    {
        await file.DeleteAsync(StorageDeleteOption.PermanentDelete);
        outputTxtBlk.Text = "File purged forever!";
        file = null;
    }
}

希望对您有所帮助。

Answer 4

你不能。 Windows Phone does not support 正在访问 SMB/网络文件共享。

无法写入 Windows Phone 中的文本文件

Can't write to a text file in Windows Phone

c#

windows-phone-8

visual-studio-2013