如何为.net编写静态代码分析器

using System;
using System.IO;
using System.Linq;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Diagnostics;

namespace UnsafeCodeAnalyzer
{
    [DiagnosticAnalyzer(LanguageNames.CSharp)]
    public class UnsafeCodeAnalyzerAnalyzer : DiagnosticAnalyzer
    {
        public const string DiagnosticId = "UnsafeCodeAnalyzer";
        private const string Title = "Unsafe code detected";
        private const string MessageFormat = "Unsafe code detected in {0}";
        private const string Category = "Usage";

        private static readonly DiagnosticDescriptor Rule = new DiagnosticDescriptor(DiagnosticId, Title, MessageFormat, Category, DiagnosticSeverity.Warning, isEnabledByDefault: true);

        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get { return ImmutableArray.Create(Rule); } }

        public override void Initialize(AnalysisContext context)
        {
            context.RegisterSyntaxNodeAction(AnalyzeNode, SyntaxKind.UnsafeStatement);
        }

        private static void AnalyzeNode(SyntaxNodeAnalysisContext context)
        {
            var node = (UnsafeStatementSyntax)context.Node;
            var diagnostic = Diagnostic.Create(Rule, node.GetLocation(), node.ToString());
            context.ReportDiagnostic(diagnostic);
        }
    }
}