IntelliSense不适用于omnisharp，但不能用于其他扩展（例如F＃）

Question

Environment data

dotnet --info output:

.NET Command Line Tools (2.0.3)

Product Information:
 Version:            2.0.3
 Commit SHA-1 hash:  12f0c7efcc

Runtime Environment:
 OS Name:     Windows
 OS Version:  6.1.7601
 OS Platform: Windows
 RID:         win7-x64
 Base Path:   C:\Program Files\dotnet\sdk\2.0.3\

Microsoft .NET Core Shared Framework Host

  Version  : 2.0.3
  Build    : a9190d4a75f4a982ae4b4fa8d1a24526566c69df

VS Code version: C# Extension version: 1.13.1

Steps to reproduce

It was working few weeks earlier properly however recently start failing to load intelliSense.

Expected behavior

Should show errors, missing reference, F12, should open definition of type.

Actual behavior

Nothing working as expected.

Screenshot: (No intelliSense error shown)

Additional details:

User Settings

// Place your settings in this file to overwrite the default settings
{
    "http.proxyStrictSSL": false,
    "editor.minimap.enabled": true,
    "csharp.suppressDotnetInstallWarning": true,  
    "editor.multiCursorModifier": "ctrlCmd",
    "terminal.integrated.shell.windows": "C:\\Program Files\\Git\\bin\\bash.exe",
    "workbench.panel.location": "bottom",
    "gitlens.advanced.messages": {
        "suppressCommitHasNoPreviousCommitWarning": false,
        "suppressCommitNotFoundWarning": false,
        "suppressFileNotUnderSourceControlWarning": false,
        "suppressGitVersionWarning": false,
        "suppressLineUncommittedWarning": false,
        "suppressNoRepositoryWarning": false,
        "suppressUpdateNotice": false,
        "suppressWelcomeNotice": true
    },
    "gitlens.blame.line.enabled":true,
    "gitlens.codeLens.enabled":true,
    "gitlens.gitExplorer.enabled":true,
    "gitlens.statusBar.enabled": true,
    "FSharp.logLanguageServiceRequests": "both",
    "FSharp.logLanguageServiceRequestsOutputWindowLevel": "WARN",
    "csharp.format.enable": false
}

Installed extensions:

I tried to resolve issue by uninstalling & installing 2-3 times, no luck !

Answer 1

Select Project /solution from status bar right bottom corner and it is started working like anything.