File Selection method on C # three platforms

Wpf:

New".txt"; Nullable<bool> result = dlg. ShowDialog (); if true ) {       //       string filename = dlg. FileName;}    

New FileStream (filename, filemode.open);             New StreamReader (Afile);

A using System.Windows.Documents is required; Using System.IO;

Windows app:

New= pickerviewmode.list;
= Pickerlocationid.desktop;
OPENPICKER.FILETYPEFILTER.ADD (".txt"await Openpicker.picksinglefileasync ();

string filename ==ss.file;
var await Fileio.readlinesasync (file);

Need:

Using Windows.storage;
Using Windows.Storage.Pickers;
Using System.Collections;

Windows Phone:

New== pickerlocationid.desktop;openpicker.filetypefilter.add (".txt  "); Openpicker.picksinglefileandcontinue ();

voidmainpage_activated (coreapplicationview sender, Windows.ApplicationModel.Activation.IActivatedEventArgs args) { Fileopenpickercontinuationeventargs Continueargs= args asFileopenpickercontinuationeventargs; if(Continueargs! =NULL) {Ss.file= continueargs.files[0]; if(Ss.file! =NULL) {BlankPage1 pg1=NewBlankPage1 (); SS.BL=true; Frame.navigate (typeof(BlankPage1)); }                Else                {                }            }}

string filename == MainPage.ss.file; var await Fileio.readlinesasync (file);

Need:

Using Windows.storage;
Using Windows.Storage.Pickers;
Using Windows.ApplicationModel.Core;
Using Windows.ApplicationModel.Activation;

Using System.Collections;

File Selection method on C # three platforms