Applied cleanup for IDE0090 to the solution.

src/BuiltInTools/BrowserRefresh/BrowserRefreshMiddleware.cs

@@ -11,7 +11,7 @@ namespace Microsoft.AspNetCore.Watch.BrowserRefresh
 {
     public class BrowserRefreshMiddleware
     {
-        private static readonly MediaTypeHeaderValue _textHtmlMediaType = new MediaTypeHeaderValue("text/html");
+        private static readonly MediaTypeHeaderValue _textHtmlMediaType = new("text/html");
         private readonly RequestDelegate _next;
         private readonly ILogger _logger;
 

src/BuiltInTools/BrowserRefresh/ResponseStreamWrapper.cs

@@ -15,7 +15,7 @@ namespace Microsoft.AspNetCore.Watch.BrowserRefresh
     /// </summary>
     public class ResponseStreamWrapper : Stream
     {
-        private static readonly MediaTypeHeaderValue _textHtmlMediaType = new MediaTypeHeaderValue("text/html");
+        private static readonly MediaTypeHeaderValue _textHtmlMediaType = new("text/html");
         private readonly Stream _baseStream;
         private readonly HttpContext _context;
         private readonly ILogger _logger;

src/BuiltInTools/dotnet-watch/Filters/LaunchBrowserFilter.cs

@@ -10,7 +10,7 @@ namespace Microsoft.DotNet.Watcher.Tools
 {
     internal sealed class LaunchBrowserFilter : IWatchFilter, IAsyncDisposable
     {
-        private static readonly Regex NowListeningRegex = new Regex(@"Now listening on: (?<url>.*)\s*$", RegexOptions.None | RegexOptions.Compiled, TimeSpan.FromSeconds(10));
+        private static readonly Regex NowListeningRegex = new(@"Now listening on: (?<url>.*)\s*$", RegexOptions.None | RegexOptions.Compiled, TimeSpan.FromSeconds(10));
         private readonly DotNetWatchOptions _options;
         private readonly string? _browserPath;
         private bool _attemptedBrowserLaunch;

src/BuiltInTools/dotnet-watch/HotReload/HotReloadEventSource.cs

@@ -28,6 +28,6 @@ internal sealed class Keywords
         [Event(2, Message = "Hot reload finished for {0}", Level = EventLevel.Informational, Keywords = Keywords.Perf)]
         public void HotReloadEnd(StartType handlerType) { WriteEvent(2, handlerType); }
 
-        public static readonly HotReloadEventSource Log = new HotReloadEventSource();
+        public static readonly HotReloadEventSource Log = new();
     }
 }

src/BuiltInTools/dotnet-watch/Internal/ConsoleReporter.cs

@@ -12,7 +12,7 @@ namespace Microsoft.Extensions.Tools.Internal
     /// </summary>
     internal sealed class ConsoleReporter : IReporter
     {
-        private readonly object _writeLock = new object();
+        private readonly object _writeLock = new();
 
         public ConsoleReporter(IConsole console)
             : this(console, verbose: false, quiet: false, suppressEmojis: false)

src/BuiltInTools/dotnet-watch/Internal/ConsoleRequester.cs

@@ -12,7 +12,7 @@ namespace Microsoft.Extensions.Tools.Internal
     /// </summary>
     internal sealed class ConsoleRequester : IRequester
     {
-        private readonly object _writeLock = new object();
+        private readonly object _writeLock = new();
 
         public ConsoleRequester(IConsole console, bool quiet, bool suppressEmojis)
         {

src/BuiltInTools/dotnet-watch/Internal/FileWatcher/DotnetFileWatcher.cs

@@ -16,7 +16,7 @@ internal class DotnetFileWatcher : IFileSystemWatcher
 
         private FileSystemWatcher _fileSystemWatcher;
 
-        private readonly object _createLock = new object();
+        private readonly object _createLock = new();
 
         public DotnetFileWatcher(string watchedDirectory)
             : this(watchedDirectory, DefaultWatcherFactory)

src/BuiltInTools/dotnet-watch/Internal/FileWatcher/PollingFileWatcher.cs

@@ -15,9 +15,9 @@ internal class PollingFileWatcher : IFileSystemWatcher
 
         private readonly DirectoryInfo _watchedDirectory;
 
-        private Dictionary<string, FileMeta> _knownEntities = new Dictionary<string, FileMeta>();
-        private Dictionary<string, FileMeta> _tempDictionary = new Dictionary<string, FileMeta>();
-        private HashSet<string> _changes = new HashSet<string>();
+        private Dictionary<string, FileMeta> _knownEntities = new();
+        private Dictionary<string, FileMeta> _tempDictionary = new();
+        private HashSet<string> _changes = new();
 
         private Thread _pollingThread;
         private bool _raiseEvents;

src/BuiltInTools/dotnet-watch/Internal/OutputCapture.cs

@@ -8,7 +8,7 @@ namespace Microsoft.DotNet.Watcher.Internal
 {
     internal sealed class OutputCapture
     {
-        private readonly List<string> _lines = new List<string>();
+        private readonly List<string> _lines = new();
         public IEnumerable<string> Lines => _lines;
         public void AddLine(string line) => _lines.Add(line);
     }

src/BuiltInTools/dotnet-watch/Internal/ProcessRunner.cs

@@ -165,7 +165,7 @@ private class ProcessState : IDisposable
         {
             private readonly IReporter _reporter;
             private readonly Process _process;
-            private readonly TaskCompletionSource _tcs = new TaskCompletionSource();
+            private readonly TaskCompletionSource _tcs = new();
             private volatile bool _disposed;
 
             public ProcessState(Process process, IReporter reporter)

src/BuiltInTools/dotnet-watch/ProjectInfo.cs

@@ -15,8 +15,8 @@ internal sealed record ProjectInfo
         string RunWorkingDirectory
     )
     {
-        private static readonly Version Version3_1 = new Version(3, 1);
-        private static readonly Version Version6_0 = new Version(6, 0);
+        private static readonly Version Version3_1 = new(3, 1);
+        private static readonly Version Version6_0 = new(6, 0);
 
         public bool IsNetCoreApp31OrNewer()
         {

src/Cli/Microsoft.DotNet.Cli.Sln.Internal/SlnFile.cs

@@ -39,11 +39,11 @@ namespace Microsoft.DotNet.Cli.Sln.Internal
 {
     public class SlnFile
     {
-        private SlnProjectCollection _projects = new SlnProjectCollection();
-        private SlnSectionCollection _sections = new SlnSectionCollection();
-        private SlnPropertySet _metadata = new SlnPropertySet(true);
+        private SlnProjectCollection _projects = new();
+        private SlnSectionCollection _sections = new();
+        private SlnPropertySet _metadata = new(true);
         private int _prefixBlankLines = 1;
-        private TextFormatInfo _format = new TextFormatInfo();
+        private TextFormatInfo _format = new();
 
         public string FormatVersion { get; set; }
         public string ProductDescription { get; set; }
@@ -105,7 +105,7 @@ public SlnFile()
 
         public static SlnFile Read(string file)
         {
-            SlnFile slnFile = new SlnFile();
+            SlnFile slnFile = new();
             slnFile.FullPath = Path.GetFullPath(file);
             slnFile._format = FileUtil.GetTextFormatInfo(file);
 
@@ -152,7 +152,7 @@ private void Read(TextReader reader)
                 }
                 else if (line.StartsWith("Project", StringComparison.Ordinal))
                 {
-                    SlnProject p = new SlnProject();
+                    SlnProject p = new();
                     p.Read(reader, line, ref curLineNum);
                     _projects.Add(p);
                 }
@@ -241,7 +241,7 @@ private void Write(TextWriter writer)
 
     public class SlnProject
     {
-        private SlnSectionCollection _sections = new SlnSectionCollection();
+        private SlnSectionCollection _sections = new();
 
         private SlnFile _parentFile;
 
@@ -635,7 +635,7 @@ internal void Write(TextWriter writer, string sectionTag)
     /// </summary>
     public class SlnPropertySet : IDictionary<string, string>
     {
-        private OrderedDictionary _values = new OrderedDictionary();
+        private OrderedDictionary _values = new();
         private bool _isMetadata;
 
         internal bool Processed { get; set; }

src/Cli/Microsoft.DotNet.Cli.Utils/AnsiExtensions.cs

@@ -5,7 +5,7 @@ namespace Microsoft.DotNet.Cli.Utils
 {
     public static class AnsiExtensions
     {
-        private static readonly Lazy<bool> _xtermEnabled = new Lazy<bool>(
+        private static readonly Lazy<bool> _xtermEnabled = new(
             () =>
             {
                 var environment = Environment.GetEnvironmentVariable("TERM");

src/Cli/Microsoft.DotNet.Cli.Utils/BlockingMemoryStream.cs

@@ -10,7 +10,7 @@ namespace Microsoft.DotNet.Cli.Utils
     /// </summary>
     public sealed class BlockingMemoryStream : Stream
     {
-        private readonly BlockingCollection<byte[]> _buffers = new BlockingCollection<byte[]>();
+        private readonly BlockingCollection<byte[]> _buffers = new();
         private ArraySegment<byte> _remaining;
 
         public override void Write(byte[] buffer, int offset, int count)

src/Cli/Microsoft.DotNet.Cli.Utils/BuiltInCommand.cs

@@ -46,8 +46,8 @@ public CommandResult Execute()
             {
                 // redirecting the standard out and error so we can forward
                 // the output to the caller
-                using (BlockingMemoryStream outStream = new BlockingMemoryStream())
-                using (BlockingMemoryStream errorStream = new BlockingMemoryStream())
+                using (BlockingMemoryStream outStream = new())
+                using (BlockingMemoryStream errorStream = new())
                 {
                     _environment.SetConsoleOut(new StreamWriter(outStream) { AutoFlush = true });
                     _environment.SetConsoleError(new StreamWriter(errorStream) { AutoFlush = true });
@@ -71,7 +71,7 @@ public CommandResult Execute()
                     Task.WaitAll(taskOut, taskErr);
 
                     // fake out a ProcessStartInfo using the Muxer command name, since this is a built-in command
-                    ProcessStartInfo startInfo = new ProcessStartInfo(new Muxer().MuxerPath, $"{CommandName} {CommandArgs}");
+                    ProcessStartInfo startInfo = new(new Muxer().MuxerPath, $"{CommandName} {CommandArgs}");
                     return new CommandResult(startInfo, exitCode, null, null);
                 }
             }

src/Cli/Microsoft.DotNet.Cli.Utils/CommandResult.cs

@@ -7,7 +7,7 @@ namespace Microsoft.DotNet.Cli.Utils
 {
     public struct CommandResult
     {
-        public static readonly CommandResult Empty = new CommandResult();
+        public static readonly CommandResult Empty = new();
 
         public ProcessStartInfo StartInfo { get; }
         public int ExitCode { get; }

src/Cli/Microsoft.DotNet.Cli.Utils/DotnetFiles.cs

@@ -11,7 +11,7 @@ internal static class DotnetFiles
         private static string SdkRootFolder => Path.Combine(typeof(DotnetFiles).GetTypeInfo().Assembly.Location, "..");
 
         private static Lazy<DotnetVersionFile> s_versionFileObject =
-            new Lazy<DotnetVersionFile>(() => new DotnetVersionFile(VersionFile));
+            new(() => new DotnetVersionFile(VersionFile));
 
         /// <summary>
         /// The SDK ships with a .version file that stores the commit information and SDK version

src/Cli/Microsoft.DotNet.Cli.Utils/EnvironmentProvider.cs

@@ -8,7 +8,7 @@ public class EnvironmentProvider : IEnvironmentProvider
         private static char[] s_pathSeparator = new char[] { Path.PathSeparator };
         private static char[] s_quote = new char[] { '"' };
         private IEnumerable<string> _searchPaths;
-        private readonly Lazy<string> _userHomeDirectory = new Lazy<string>(() => Environment.GetEnvironmentVariable("HOME") ?? string.Empty);
+        private readonly Lazy<string> _userHomeDirectory = new(() => Environment.GetEnvironmentVariable("HOME") ?? string.Empty);
         private IEnumerable<string> _executableExtensions;
 
         public IEnumerable<string> ExecutableExtensions

src/Cli/Microsoft.DotNet.Cli.Utils/FrameworkDependencyFile.cs

@@ -112,7 +112,7 @@ internal static bool TryGetMostFitRuntimeIdentifier(
         private DependencyContext CreateDependencyContext()
         {
             using (Stream depsFileStream = File.OpenRead(_depsFilePath))
-            using (DependencyContextJsonReader reader = new DependencyContextJsonReader())
+            using (DependencyContextJsonReader reader = new())
             {
                 return reader.Read(depsFileStream);
             }

src/Cli/Microsoft.DotNet.Cli.Utils/MSBuildForwardingAppWithoutLogging.cs

@@ -38,7 +38,7 @@ internal class MSBuildForwardingAppWithoutLogging
         public bool ExecuteMSBuildOutOfProc => _forwardingApp != null;
 
         private readonly Dictionary<string, string> _msbuildRequiredEnvironmentVariables =
-            new Dictionary<string, string>
+            new()
             {
                 { "MSBuildExtensionsPath", MSBuildExtensionsPathTestHook ?? AppContext.BaseDirectory },
                 { "MSBuildSDKsPath", GetMSBuildSDKsPath() },
@@ -133,7 +133,7 @@ public int Execute()
         public int ExecuteInProc(string[] arguments)
         {
             // Save current environment variables before overwriting them.
-            Dictionary<string, string> savedEnvironmentVariables = new Dictionary<string, string>();
+            Dictionary<string, string> savedEnvironmentVariables = new();
             try
             {
                 foreach (KeyValuePair<string, string> kvp in _msbuildRequiredEnvironmentVariables)

src/Cli/Microsoft.DotNet.Cli.Utils/MSBuildPropertyParser.cs

@@ -15,8 +15,8 @@ public static class MSBuildPropertyParser
     public static IEnumerable<(string key, string value)> ParseProperties(string input)
     {
         var currentPos = 0;
-        StringBuilder currentKey = new StringBuilder();
-        StringBuilder currentValue = new StringBuilder();
+        StringBuilder currentKey = new();
+        StringBuilder currentValue = new();
 
         (string key, string value) EmitAndReset()
         {

src/Cli/Microsoft.DotNet.Cli.Utils/PathUtility.cs

@@ -230,7 +230,7 @@ public static string GetAbsolutePath(string basePath, string relativePath)
                 throw new ArgumentNullException(nameof(relativePath));
             }
 
-            Uri resultUri = new Uri(new Uri(basePath), new Uri(relativePath, UriKind.Relative));
+            Uri resultUri = new(new Uri(basePath), new Uri(relativePath, UriKind.Relative));
             return resultUri.LocalPath;
         }
 

src/Cli/Microsoft.DotNet.Cli.Utils/RuntimeEnvironment.cs

@@ -17,8 +17,8 @@ internal enum Platform
 
     internal static class RuntimeEnvironment
     {
-        private static readonly Lazy<Platform> _platform = new Lazy<Platform>(DetermineOSPlatform);
-        private static readonly Lazy<DistroInfo> _distroInfo = new Lazy<DistroInfo>(LoadDistroInfo);
+        private static readonly Lazy<Platform> _platform = new(DetermineOSPlatform);
+        private static readonly Lazy<DistroInfo> _distroInfo = new(LoadDistroInfo);
 
         public static Platform OperatingSystemPlatform { get; } = GetOSPlatform();
         public static string OperatingSystemVersion { get; } = GetOSVersion();

src/Cli/Microsoft.DotNet.Cli.Utils/Uuid.cs

@@ -15,7 +15,7 @@ public class Uuid
         public static Guid Create(string name)
         {
             // Any fixed GUID will do for a namespace.
-            Guid namespaceId = new Guid("28F1468D-672B-489A-8E0C-7C5B3030630C");
+            Guid namespaceId = new("28F1468D-672B-489A-8E0C-7C5B3030630C");
 
             using (SHA1 hasher = SHA1.Create())
             {

src/Cli/Microsoft.DotNet.Configurer/CliFolderPathCalculator.cs

@@ -23,7 +23,7 @@ public static class CliFolderPathCalculator
             ToolPackageFolderPathCalculator.GetToolPackageFolderPath(ToolsShimPath);
 
         public static BashPathUnderHomeDirectory ToolsShimPathInUnix =>
-            new BashPathUnderHomeDirectory(
+            new(
                 DotnetHomePath,
                 Path.Combine(DotnetProfileDirectoryName, ToolsShimFolderName));
 

src/Cli/Microsoft.TemplateEngine.Cli/Alias/AliasRegistry.cs

@@ -55,7 +55,7 @@ internal AliasManipulationResult TryCreateOrRemoveAlias(string aliasName, IReadO
             }
 
             //ensure loaded sets aliases
-            Dictionary<string, IReadOnlyList<string>> aliasesWithCandidate = new Dictionary<string, IReadOnlyList<string>>(_aliases!.CommandAliases);
+            Dictionary<string, IReadOnlyList<string>> aliasesWithCandidate = new(_aliases!.CommandAliases);
             aliasesWithCandidate[aliasName] = aliasTokens;
             if (!TryExpandCommandAliases(aliasesWithCandidate, aliasTokens, out IReadOnlyList<string>? expandedInputTokens))
             {
@@ -92,7 +92,7 @@ internal bool TryExpandCommandAliases(IReadOnlyList<string> inputTokens, out IRe
         private static bool TryExpandCommandAliases(IReadOnlyDictionary<string, IReadOnlyList<string>> aliases, IReadOnlyList<string> inputTokens, out IReadOnlyList<string>? expandedTokens)
         {
             bool expansionOccurred = false;
-            HashSet<string> seenAliases = new HashSet<string>();
+            HashSet<string> seenAliases = new();
             expandedTokens = new List<string>(inputTokens);
 
             do
@@ -156,7 +156,7 @@ private void Save()
         // reads a dictionary whose values can either be string literals, or arrays of strings.
         private IReadOnlyDictionary<string, IReadOnlyList<string>> ToStringListDictionary(JToken token, StringComparer? comparer = null, string? propertyName = null)
         {
-            Dictionary<string, IReadOnlyList<string>> result = new Dictionary<string, IReadOnlyList<string>>(comparer ?? StringComparer.Ordinal);
+            Dictionary<string, IReadOnlyList<string>> result = new(comparer ?? StringComparer.Ordinal);
             JObject? jObj = token as JObject;
             if (jObj == null || propertyName == null || !jObj.TryGetValue(propertyName, StringComparison.OrdinalIgnoreCase, out JToken? element))
             {
@@ -188,7 +188,7 @@ private IReadOnlyDictionary<string, IReadOnlyList<string>> ToStringListDictionar
                     }
                     else
                     {
-                        List<string> values = new List<string>();
+                        List<string> values = new();
                         foreach (JToken item in arr)
                         {
                             if (item != null && item.Type == JTokenType.String)

src/Cli/Microsoft.TemplateEngine.Cli/ChoiceTemplateParameter.cs

@@ -16,7 +16,7 @@ namespace Microsoft.TemplateEngine.Cli
     /// </summary>
     internal class ChoiceTemplateParameter : CliTemplateParameter
     {
-        private Dictionary<string, ParameterChoice> _choices = new Dictionary<string, ParameterChoice>(StringComparer.OrdinalIgnoreCase);
+        private Dictionary<string, ParameterChoice> _choices = new(StringComparer.OrdinalIgnoreCase);
 
         internal ChoiceTemplateParameter(ITemplateParameter parameter, HostSpecificTemplateData data) : base(parameter, data)
         {
@@ -177,7 +177,7 @@ private static bool TryConvertValueToChoice(IEnumerable<string> values, ChoiceTe
             parsedValue = string.Empty;
             error = string.Empty;
 
-            List<string> parsedValues = new List<string>();
+            List<string> parsedValues = new();
             foreach (string val in values)
             {
                 if (!TryConvertSingleValueToChoice(val, parameter, out string value, out error))

src/Cli/Microsoft.TemplateEngine.Cli/CliEnvironment.cs

@@ -12,7 +12,7 @@ internal class CliEnvironment : IEnvironment
 
         public CliEnvironment()
         {
-            Dictionary<string, string> variables = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+            Dictionary<string, string> variables = new(StringComparer.OrdinalIgnoreCase)
             {
                 { "TEMPLATE_ENGINE_DISABLE_FILEWATCHER", "1" }
             };

src/Cli/Microsoft.TemplateEngine.Cli/CliTemplateParameter.cs

@@ -27,9 +27,9 @@ internal enum ParameterType
     /// </summary>
     internal class CliTemplateParameter
     {
-        private readonly List<string> _shortNameOverrides = new List<string>();
+        private readonly List<string> _shortNameOverrides = new();
 
-        private readonly List<string> _longNameOverrides = new List<string>();
+        private readonly List<string> _longNameOverrides = new();
 
         private readonly TemplateParameterPrecedence _precedence;
 
@@ -458,7 +458,7 @@ private static Func<ArgumentResult, T> GetParseArgument<T>(CliTemplateParameter
 
         private string GetOptionDescription()
         {
-            StringBuilder displayValue = new StringBuilder(255);
+            StringBuilder displayValue = new(255);
             displayValue.AppendLine(Description);
 
             string? precedenceValue = GetPrecedenceInfo(_precedence);

src/Cli/Microsoft.TemplateEngine.Cli/Commands/AliasAssignmentCoordinator.cs

@@ -23,8 +23,8 @@ internal class AliasAssignmentCoordinator
 
             foreach (var parameter in parameters)
             {
-                HashSet<string> aliases = new HashSet<string>(StringComparer.Ordinal);
-                List<string> errors = new List<string>();
+                HashSet<string> aliases = new(StringComparer.Ordinal);
+                List<string> errors = new();
                 if (parameter.Name.Contains(':'))
                 {
                     // Colon is reserved, template param names cannot have any.