C# xamarin - rooted android write /data /sytem

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i want to modify data in /data/data or /system lets call it file.bin

var sdcardPath = Android.OS.Environment.RootDirectory.Path;
var files = Path.Combine(sdcardPath, "/data/data/com.xyz/file.bin");
Java.Lang.Runtime.GetRuntime().Exec("chmod 777" + files);
BinaryWriter bw = new BinaryWriter(File.OpenWrite(files));

i can read that file, but cant read because System.UnauthorizedAccessException i think it must have permission in manifest like SDCard write permission, but i cant find any documentation to get /Data Write.

What I have tried:

tying with make /data mount to rw but still cannot write

Java.Lang.Runtime.GetRuntime().Exec("su " + "mount -o rw, remount, rw /data ");

Posted 14-Mar-17 15:18pm

Member 12230809

Updated 14-Mar-17 15:24pm

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Graeme_Grant · Answer 1 · 2017-03-14T15:24:00

Solution 1

Did you look in the Xamarin forums? A quick Google search found this: UnauthorizedAccessException Creating Directory — Xamarin Forums[^]

Posted 14-Mar-17 15:24pm

Graeme_Grant

Comments

Member 12230809 14-Mar-17 21:35pm

i want to get grant access to write file in /data/data or /system not in external/internal storage

Graeme_Grant 14-Mar-17 22:41pm

It may be related though. The key thing is that Xamarin has dedicated specialized forums for your question and you will have a better chance of getting the answer that you are looking for these than here.