c# - In my VS extension, how can I programmatically preview a file in Visual Studio 2015/2017? -


in visual studio extension display related files.

i have code can open file in visual studio.

i want code can preview file

this code use open file using dte2 object. how can preview file?

public void viewfile(fileinfo file) {     if (null == file)         throw new argumentnullexception(nameof(file));      var dte2 = (envdte80.dte2)dte;     dte2.mainwindow.activate();     var newwindow = dte2.itemoperations.isfileopen(file.fullname)             ? findwindow(file.fullname)             : dte2.itemoperations.openfile(file.fullname);     newwindow.activate(); }

this previewed file, if single click in solution explorer:

enter image description here

this opened file, if double click in solution explorer, or make change previewed file:

enter image description here


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