vim syntastic omnisharp-vim giving false errors - vim

Question

So I am using the omnisharp-vim plugin along with syntastic to show my errors in my web project. When I load a cs file up it is reporting all these errors. When I open the same project up in VS 2015 I do not see the same errors
MyProject.Web\Controllers\DashboardController.cs|11 col 52 error| 'MyProjectAuthorizeAttribute' is not a known identifier
MyProject.Web\Controllers\DashboardController.cs|11 col 54 error| Error: ?
MyProject.Web\Controllers\DashboardController.cs|12 col 51 error| 'BaseController' is not a known identifier
MyProject.Web\Controllers\DashboardController.cs|14 col 27 error| 'ILogger' is not a known identifier
MyProject.Web\Controllers\DashboardController.cs|15 col 44 error| 'ILoggerFactory' is not a known identifier
Maybe I am missing some configuration in my .vimrc file?
" General -----------------------
set nocompatible " Makes vim better
scriptencoding utf-8 " Setting everything to UTF-8
set encoding=utf-8
set history=256
set timeoutlen=250
set clipboard+=unnamed
let g:autotagTagsFile = ".git/tags"
set tags=./.git/tags,tags,./.git/coffeetags,coffeetags;$HOME
set nobackup
set nowritebackup
set noswapfile
set hlsearch
set ignorecase
set smartcase
set incsearch
" turn off search highlight
nnoremap <leader><space> :nohlsearch<CR>
let mapleader = ','
let maplocalleader = ' '
let g:netrw_banner = 0
" Formatting --------------------
set nowrap
set tabstop=4
set softtabstop=4
set shiftwidth=4
set backspace=indent
set backspace+=eol
set backspace+=start
set autoindent
set cindent
set indentkeys-=0#
set cinkeys-=0#
set cinoptions=:s,ps,ts,cs
set cinwords=if,else,while,do
set cinwords+=for,switch,case
set linespace=4
set listchars=tab:>.,trail:.,extends:\#,nbsp:.
set list
" Plugins ------------------------
filetype off
set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()
Plugin 'gmarik/Vundle.vim'
Plugin 'OmniSharp/omnisharp-vim'
Plugin 'tpope/vim-dispatch'
Plugin 'scrooloose/syntastic'
Plugin 'Shougo/unite.vim'
Plugin 'xero/sourcerer.vim'
Plugin 'bling/vim-airline'
Plugin 'airblade/vim-gitgutter'
Plugin 'ap/vim-css-color'
Plugin 'groenewege/vim-less'
Plugin 'hail2u/vim-css3-syntax'
Plugin 'kien/ctrlp.vim'
Plugin 'jasoncodes/ctrlp-modified.vim'
Plugin 'kaneshin/ctrlp-git-log'
Plugin 'jiangmiao/auto-pairs'
Plugin 'lokaltog/vim-easymotion'
Plugin 'majutsushi/tagbar'
Plugin 'mattn/ctrlp-git'
Plugin 'tacahiroy/ctrlp-funky'
Plugin 'mattn/emmet-vim'
Plugin 'mtscout6/rainbow_parentheses.vim'
Plugin 'mtscout6/vim-ctags-autotag'
Plugin 'mtscout6/vim-tagbar-css'
Plugin 'scrooloose/nerdtree'
Plugin 'terryma/vim-multiple-cursors'
Plugin 'tpope/vim-fugitive'
Plugin 'tpope/vim-git'
Plugin 'tpope/vim-markdown'
Plugin 'tpope/vim-surround'
call vundle#end()
filetype plugin indent on
" Rainbow
map <leader>rt :RainbowParenthesesToggle<CR>
map <leader>r( :RainbowParenthesesLoadRound<CR>
map <leader>r[ :RainbowParenthesesLoadSquare<CR>
map <leader>r{ :RainbowParenthesesLoadBraces<CR>
map <leader>r< :RainbowParenthesesLoadChevrons<CR>
" File Type Settings --------------------
" Markdown editing
autocmd Filetype markdown setlocal wrap
autocmd Filetype markdown setlocal linebreak
autocmd Filetype markdown setlocal nolist
autocmd Filetype markdown setlocal columns=80
autocmd Filetype markdown setlocal tw=80
autocmd Filetype markdown setlocal wm=4
" GVIM Options -----------------------
set guioptions-=m
set guioptions-=T
set guioptions-=r
set guioptions-=L
" Visual ------------------------
syntax on
set showmatch
if has('gui_running')
set guifont=InputMono:h14
colorscheme sourcerer
if has('mac')
set noantialias
endif
endif
set novisualbell
set noerrorbells
set vb t_vb=
set laststatus=2
" Airline Settings
let g:airline_powerline_fonts = 1
let g:airline#extensions#tabline#enabled = 1
" Default
let g:airline#extensions#tmuxline#enabled = 0
" Presentation
"let g:airline#extensions#tmuxline#enabled = 1
" Ctrl-P settings
let g:ctrlp_working_path_mode = 'r'
let g:ctrlp_extensions = ['tag', 'buffertag', 'line', 'funky']
", 'git-log', 'git_branch', 'git_files', 'modified']
let g:ctrlp_custom_ignore = 'node_modules\|DS_Store\|git|bower_components'
map <leader>t :CtrlP<CR>
map <leader>gs :CtrlPGitFiles<CR>
map <leader>gb :CtrlPGitBranch<CR>
map <leader>gl :CtrlPGitLog<CR>
map <leader>gm :CtrlPModified<CR>
" ctrlp-modified
map <Leader>m :CtrlPModified<CR>
map <Leader>M :CtrlPBranch<CR>
" Tagbar settings
map <F8> :TagbarToggle<CR>
" Emmet settings
imap <C-e> <C-y>,
" Multiple Cursor Settings
let g:multi_cursor_use_default_mapping=0
let g:multi_cursor_start_key='<leader>m'
let g:multi_cursor_next_key='<C-n>'
let g:multi_cursor_prev_key='<C-p>'
let g:multi_cursor_skip_key='<C-x>'
let g:multi_cursor_quit_key='<Esc>'
" Git Gutter Settings
highlight clear SignColumn
map ]h <Plug>GitGutterNextHunk
map [h <Plug>GitGutterPrevHunk
map <leader>hv <Plug>GitGutterPreviewHunk
map <Leader>hs <Plug>GitGutterStageHunk
map <Leader>hr <Plug>GitGutterRevertHunk
" NERD Tree Settings
map <TAB> :NERDTreeToggle<CR>
map <leader>ff :NERDTreeFind<CR>
let NERDTreeShowHidden=1
let NERDTreeIgnore=[]
" Syntastic Settings
let g:syntastic_always_populate_loc_list = 1
let g:syntastic_auto_loc_list = 1
let g:syntastic_check_on_open = 1
let g:syntastic_check_on_wq = 0
"let g:syntastic_<filetype>_checkers = ['omnisharp']
let g:syntastic_cs_checkers = ['syntax', 'semantic', 'issues']
" Omnisharp settings
let g:OmniSharp_server_type = 'roslyn'
let g:OmniSharp_selector_ui = 'unite'
let g:OmniSharp_selector_ui = 'ctrlp'
let g:OmniSharp_timeout = 1
set noshowmatch
set completeopt=longest,menuone,preview
set splitbelow
augroup omnisharp_commands
autocmd!
"Set autocomplete function to OmniSharp (if not using YouCompleteMe completion plugin)
autocmd FileType cs setlocal omnifunc=OmniSharp#Complete
" Synchronous build (blocks Vim)
"autocmd FileType cs nnoremap <F5> :wa!<cr>:OmniSharpBuild<cr>
" Builds can also run asynchronously with vim-dispatch installed
autocmd FileType cs nnoremap <leader>b :wa!<cr>:OmniSharpBuildAsync<cr>
" automatic syntax check on events (TextChanged requires Vim 7.4)
autocmd BufEnter,TextChanged,InsertLeave *.cs SyntasticCheck
" Automatically add new cs files to the nearest project on save
autocmd BufWritePost *.cs call OmniSharp#AddToProject()
"show type information automatically when the cursor stops moving
autocmd CursorHold *.cs call OmniSharp#TypeLookupWithoutDocumentation()
"The following commands are contextual, based on the current cursor position.
autocmd FileType cs nnoremap gd :OmniSharpGotoDefinition<cr>
autocmd FileType cs nnoremap <leader>fi :OmniSharpFindImplementations<cr>
autocmd FileType cs nnoremap <leader>ft :OmniSharpFindType<cr>
autocmd FileType cs nnoremap <leader>fs :OmniSharpFindSymbol<cr>
autocmd FileType cs nnoremap <leader>fu :OmniSharpFindUsages<cr>
"finds members in the current buffer
autocmd FileType cs nnoremap <leader>fm :OmniSharpFindMembers<cr>
" cursor can be anywhere on the line containing an issue
autocmd FileType cs nnoremap <leader>x :OmniSharpFixIssue<cr>
autocmd FileType cs nnoremap <leader>fx :OmniSharpFixUsings<cr>
autocmd FileType cs nnoremap <leader>tt :OmniSharpTypeLookup<cr>
autocmd FileType cs nnoremap <leader>dc :OmniSharpDocumentation<cr>
"navigate up by method/property/field
autocmd FileType cs nnoremap <C-K> :OmniSharpNavigateUp<cr>
"navigate down by method/property/field
autocmd FileType cs nnoremap <C-J> :OmniSharpNavigateDown<cr>
augroup END
nnoremap <leader><space> :OmniSharpGetCodeActions<cr>
vnoremap <leader><space> :call OmniSharp#GetCodeActions('visual')<cr>
" rename with dialog
nnoremap <leader>nm :OmniSharpRename<cr>
nnoremap <F2> :OmniSharpRename<cr>
" rename without dialog - with cursor on the symbol to rename... ':Rename newname'
command! -nargs=1 Rename :call OmniSharp#RenameTo("<args>")
" Force OmniSharp to reload the solution. Useful when switching branches etc.
nnoremap <leader>rl :OmniSharpReloadSolution<cr>
nnoremap <leader>cf :OmniSharpCodeFormat<cr>
" Load the current .cs file to the nearest project
nnoremap <leader>tp :OmniSharpAddToProject<cr>
" (Experimental - uses vim-dispatch or vimproc plugin) - Start the omnisharp server for the current solution
nnoremap <leader>ss :OmniSharpStartServer<cr>
nnoremap <leader>sp :OmniSharpStopServer<cr>
" Add syntax highlighting for types and interfaces
nnoremap <leader>th :OmniSharpHighlightTypes<cr>
"Don't ask to save when changing buffers (i.e. when jumping to a type definition)
set hidden

Answer 1

probably VS dont use the same checkers as syntastic ,
run the comand :SyntasticInfo
and it will return what checker it is using them you can find why is those errors comming up and how to make you program pass the syntax checker
obs i dont know visual studio but most of your error are is not a known identifier
maybe is because it is defined in other file and VS checks it but not syntastic checker