Reading Binary file on Windows phone

Question

I want to read a binary file using BinaryReader, but I keep getting an exception:

using (var stream = File.Open("file.bin", FileMode.Open, FileAccess.Read))
        {
            using (BinaryReader r = new BinaryReader(stream)) //EXCEPTION
            {

            }
        }

the "file.bin" has been set as a Content in the build action, but I keep getting this exception:

System.MethodAccessException was unhandled

Attempt to access the method failed: System.IO.File.Open(System.String, System.IO.FileMode, System.IO.FileAccess)

Jon Skeet · Accepted Answer · 2013-10-10 13:18:28Z

1

You don't use File.Open on Windows Phone 7 - you have to use isolated storage.

See the System.IO.IsolatedStorage namespace for more details.

For example:

using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
    using (var stream = store.OpenFile("file.bin", FileMode.Open))
    {
        using (var reader = new BinaryReader(stream))
        {

        }
    }
}

EDIT: As noted in comments, for content built into the XAP, you should use Application.GetResourceStream.

edited Oct 10, 2013 at 13:18

answered Nov 25, 2011 at 8:04

Jon Skeet

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3 Comments

Ateik Over a year ago

but I need to read a file from the content of my xap file. can i access these files using IsolatedStroage?

Jon Skeet Over a year ago

@user836252: Ah, you should have said. No, those won't be in isolated storage. I believe you need Application.GetResourceStream. See this similar question.

Ateik Over a year ago

I've said it has been set as a content in the build action lol but thanks, it works using GetResourceStrea

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