无法写入Windows Phone中的文本文件

Question

Ok so I need to write to a text file on my home network in c#. The problem is that I cant use anything with System.IO.File because it is not supported on Windows Phone. I'm trying to use System.IO.StreamWriter but this is creating a problem.

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

This is as far as I have got and it says:

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

I have been searching for an answer for this but nobody seems to have this problem.

Answer 1

Read the StreamWriter documentation for Windows phone; it takes a System.IO.Stream , not a string and there is no such thing as System.IO.string .

If you can actually write to a path (and if you can't check out isolated storage ) you can do this:

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

Answer 2

I've made a small example to illustrate writing (and reading). This is my 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>

And this is the code behind illustrating reading and writing to a file on a windows phone:

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;
    }
}

I hope this helps.

Answer 3

You can't. Windows Phone does not support accessing SMB / network file shares.

Answer 4

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

Try this.