OmniSharp exposes a set of configuration options that can be used to modify the behavior of OmniSharp regarding:
At startup, OmniSharp obtains the configuration options using the following (hierarchical) order:
omnisharp.json file located in %USERPROFILE%/.omnisharp/omnisharp.json file located in the working directory which OmniSharp has been pointed atEach of the configuration sources, can overwrite any of the settings set by the previous source.
All the possible configuration options (with their default values) are defined below.
Each project system deals with different types of projects and can be disabled if you wish to only focus on specific features and don't need anything else.
Used to configure MSBuild solutions and projects. Below is an example Configuration, in case you would want to force OmniSharp into a custom one.
{
"msbuild": {
"enabled": true,
"ToolsVersion": null,
"VisualStudioVersion": null,
"Configuration": null,
"Platform": null,
"EnablePackageAutoRestore" : false,
"MSBuildExtensionsPath": null,
"TargetFrameworkRootPath" : null,
"MSBuildSDKsPath": null,
"RoslynTargetsPath" : null,
"CscToolPath": null,
"CscToolExe": null,
"loadProjectsOnDemand": false,
"GenerateBinaryLogs": false
}
}
Used to configure C# scripting (CSX files).
{
"script": {
"enabled": true,
"defaultTargetFramework": "net461",
"enableScriptNuGetReferences": false
}
}
Used to configure Cake (cake files).
{
"cake": {
"enabled": true,
"bakeryPath ": null
}
}
You can use the config to force OmniSharp to use a specific dotnet SDK
{
"sdk": {
"path": "/usr/local/share/dotnet/sdk/6.0.403/",
"version": "6.0.403"
}
}
Used to control C# formatting. You can also enable .editorconfig support here and automatic sorting of using statements upon formatting. We recommend keeping your code style preferences in .editorconfig as that is also supported by the Roslyn compiler and other editors.
{
"FormattingOptions": {
"EnableEditorConfigSupport": false,
"OrganizeImports": false,
"NewLine": "\n",
"UseTabs": false,
"TabSize": 4,
"IndentationSize": 4,
"SpacingAfterMethodDeclarationName": false,
"SpaceWithinMethodDeclarationParenthesis": false,
"SpaceBetweenEmptyMethodDeclarationParentheses": false,
"SpaceAfterMethodCallName": false,
"SpaceWithinMethodCallParentheses": false,
"SpaceBetweenEmptyMethodCallParentheses": false,
"SpaceAfterControlFlowStatementKeyword": true,
"SpaceWithinExpressionParentheses": false,
"SpaceWithinCastParentheses": false,
"SpaceWithinOtherParentheses": false,
"SpaceAfterCast": false,
"SpacesIgnoreAroundVariableDeclaration": false,
"SpaceBeforeOpenSquareBracket": false,
"SpaceBetweenEmptySquareBrackets": false,
"SpaceWithinSquareBrackets": false,
"SpaceAfterColonInBaseTypeDeclaration": true,
"SpaceAfterComma": true,
"SpaceAfterDot": false,
"SpaceAfterSemicolonsInForStatement": true,
"SpaceBeforeColonInBaseTypeDeclaration": true,
"SpaceBeforeComma": false,
"SpaceBeforeDot": false,
"SpaceBeforeSemicolonsInForStatement": false,
"SpacingAroundBinaryOperator": "single",
"IndentBraces": false,
"IndentBlock": true,
"IndentSwitchSection": true,
"IndentSwitchCaseSection": true,
"IndentSwitchCaseSectionWhenBlock": true,
"LabelPositioning": "oneLess",
"WrappingPreserveSingleLine": true,
"WrappingKeepStatementsOnSingleLine": true,
"NewLinesForBracesInTypes": true,
"NewLinesForBracesInMethods": true,
"NewLinesForBracesInProperties": true,
"NewLinesForBracesInAccessors": true,
"NewLinesForBracesInAnonymousMethods": true,
"NewLinesForBracesInControlBlocks": true,
"NewLinesForBracesInAnonymousTypes": true,
"NewLinesForBracesInObjectCollectionArrayInitializers": true,
"NewLinesForBracesInLambdaExpressionBody": true,
"NewLineForElse": true,
"NewLineForCatch": true,
"NewLineForFinally": true,
"NewLineForMembersInObjectInit": true,
"NewLineForMembersInAnonymousTypes": true,
"NewLineForClausesInQuery": true
}
}
Used to define refactorings, code actions, analyzer locations that OmniSharp should use (i.e. Roslynator), analysis timeout, decompilation support (via ILSpy) and unimported type completion in intellisense.
{
"RoslynExtensionsOptions": {
"documentAnalysisTimeoutMs": 30000,
"enableDecompilationSupport": true,
"enableImportCompletion": true,
"enableAnalyzersSupport": true,
"diagnosticWorkersThreadCount": 8,
"locationPaths": [
"//path_to/code_actions.dll"
],
"inlayHintsOptions": {
"enableForParameters": true,
"forLiteralParameters": true,
"forIndexerParameters": true,
"forObjectCreationParameters": true,
"forOtherParameters": true,
"suppressForParametersThatDifferOnlyBySuffix": false,
"suppressForParametersThatMatchMethodIntent": false,
"suppressForParametersThatMatchArgumentName": false,
"enableForTypes": true,
"forImplicitVariableTypes": true,
"forLambdaParameterTypes": true,
"forImplicitObjectCreation": true
}
}
}
If EnableAnalyzersSupport is not enabled only refactorings are available.
If you want to run the analyzers sequentially instead of in parallel - set diagnosticWorkersThreadCount to 1. If no value is given for the thread count 75% of the cores will be used (i.e. 12 cores on a 16 core machine).
Used to define which directories and files should be included in OmniSharp's project file / solution file discovery process. Not individual .cs files.
{
"fileOptions": {
"systemExcludeSearchPatterns": [
"**/node_modules/**/*",
"**/bin/**/*",
"**/obj/**/*"
],
"excludeSearchPatterns": []
}
}
Technically you can use either of those to instruct OmniSharp to not use certain search paths. This is particularly useful when opening folders with lots of subfolders. The difference between systemExcludeSearchPatterns and excludeSearchPatterns is that the first would typically be used by tools such as VS Code to automatically share its exclusion settings with OmniSharp. The second one is recommended for manual editing.
Used to control behaviour of renaming.
{
"RenameOptions": {
"RenameInComments": false,
"RenameOverloads": false,
"RenameInStrings": false
}
}
For details you could check https://github.com/OmniSharp/omnisharp-roslyn/pull/1495.
Overriding the configurationEnvironment variables should be passed into the OmniSharp process as flattened JSON paths. Instead of ., : should be used as a delimiter. Environment variables must be prefixed with OMNISHARP_.
To override the default formattingOptions > tabSize setting of 4 with 2, you should set environment variable OMNISHARP_formattingOptions:tabSize with the value 2.
Command line arguments are parsed by OmniSharp after environment variables. Their format is the same as environment variables - flattened JSON paths, with : as a delimiter. Additionally, the do not require any prefix - neither -, nor --.
To override the default formattingOptions > tabSize setting of 4, or anything set by environment variables, with 2, you should launch OmniSharp with the following command:
OmniSharp.exe -s {folder path} {other arguments} formattingOptions:tabSize=2
Next in order is a global omnisharp.json located at %USERPROFILE%/.omnisharp/omnisharp.json. It can contain only individual settings, and they will be merged into the settings provided by out of the box by OmniSharp, environment variables and command line args, and simply overwrite the matching ones. It's worth noting that,the file is not automatically created by OmniSharp - only its containing folder is. So if you can't find omnisharp.json inside %USERPROFILE%/.omnisharp, create it manually.
To override the default formattingOptions > tabSize setting of 4, or anything set by environment variables/command line args with 2, you should create the following omnisharp.json file at %USERPROFILE%/.omnisharp/omnisharp.json:
{
"formattingOptions": {
"tabSize": 2
}
}
Because the global omnisharp.json is picked up any time OmniSharp starts, regardless of the folder you point OmniSharp at, a global configuration file is the best option for any settings you want to automatically apply to all your projects (machine-wide settings).
The highest order of precedence is given to omnisharp.json located in the folder which OmniSharp server is looking at. Just like it's the case for the global omnisharp.json - you can use it to overwrite the relevant configuration keys.
While a global omnisharp.json is relevant for machine-wide settings, a local omnisharp.json is suitable for project-specific settings.
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