c# - Minimizing code impact of migrating to Azure Blob storage -

i'm attempting migrate complex application windows azure. in both worker role , web role there many instances application saves files local file system.

here's example:

string thumbnailfilename = system.io.path.getdirectoryname(filename) + "\\" + "bthumb_" + system.io.path.getfilename(filename);  thumbnail.save(thumbnailfilename); 

and example:

 using (system.io.streamwriter file = system.io.file.appendtext(getcurrentlogfilepath()))    {      string logentry = string.format("\r\n{0} - {1}: {2}", datetime.now.tostring("yyyy.mm.dd@hh.mm.ss"), type.tostring(), message);      file.write(logentry);       file.close();    } 

in these examples saving images , log files file locations specified in app.config. here's example:

<add key="imagefiledirectory" value="c:\temp\foo\root\auth\inventorypictures"/> 

i'd make few code changes possible support azure blob storage in case ever decide move more traditional hosting environment , more reduce potential creating unintended problems.

based on post i've decided azure drive not best way go.

can guide me in right direction (ideally example)? best solution in mind 1 requires change config file. i'm guessing not realistic.

indeed, want use azure blob storage save files.

as coding question, consider creating interface, call ifilestore:

public interface ifilestore {    void save(string filepath, byte [] contents);    byte [] read(string filepath); } 

then create 2 provider classes, 1 file system, , 1 azure blob storage.

the file system provider can implement save function this:

    public void save(string filepath, byte [] content)     {         file.writeallbytes(filepath, content);     }      public byte [] read(string filepath)     {         return file.readallbytes(filepath);     } 

as azure blob provider, have derive storage path based on filepath passed in you.