File: DiagnosticAnalyzer\DictionaryAnalyzerConfigOptions.cs
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Project: src\src\Compilers\Core\Portable\Microsoft.CodeAnalysis.csproj (Microsoft.CodeAnalysis)
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics.CodeAnalysis;
 
namespace Microsoft.CodeAnalysis.Diagnostics
{
    internal sealed class DictionaryAnalyzerConfigOptions : AnalyzerConfigOptions
    {
        internal static readonly ImmutableDictionary<string, string> EmptyDictionary = ImmutableDictionary.Create<string, string>(KeyComparer);
 
        public static DictionaryAnalyzerConfigOptions Empty { get; } = new DictionaryAnalyzerConfigOptions(EmptyDictionary);
 
        // Note: Do not rename. Older versions of analyzers access this field via reflection.
        // https://github.com/dotnet/roslyn/blob/8e3d62a30b833631baaa4e84c5892298f16a8c9e/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/Core/Options/EditorConfig/EditorConfigStorageLocationExtensions.cs#L21
        internal readonly ImmutableDictionary<string, string> Options;
 
        public DictionaryAnalyzerConfigOptions(ImmutableDictionary<string, string> options)
            => Options = options;
 
        public override bool TryGetValue(string key, [NotNullWhen(true)] out string? value)
            => Options.TryGetValue(key, out value);
 
        public override IEnumerable<string> Keys
            => Options.Keys;
    }
}