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public override void Initialize(AnalysisContext context)
{
    context.RegisterSymbolAction(AnalyzeSymbol, SymbolKind.NamedType);
}

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var classSymbol = context.Symbol as INamedTypeSymbol;
if (classSymbol?.TypeKind != TypeKind.Class)
    return; //we only need classes, not other types like enum, struct, etc.

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using System;

namespace ConsoleApp1
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
        }

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var members = new List<ISymbol>();
foreach (var member in classSymbol.GetMembers())
{
    if (member.Kind == SymbolKind.Method)
    {
        var methodMember = member as IMethodSymbol;
        if (methodMember.MethodKind == MethodKind.PropertyGet || methodMember.MethodKind == MethodKind.PropertySet)
            continue;
    }
    members.Add(member);

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private static ISymbol GetUnorderedMember(List<ISymbol> members)
{
    //I'm just sorting the members by DeclaredAccessibility, then comparing them with the order of
    //the initial members
    var orderedByAccessibility = members.OrderByDescending(m => m.DeclaredAccessibility).ToList();
    for (var i = 0; i < members.Count; i++)
    {
        if (members[i].DeclaredAccessibility != orderedByAccessibility[i].DeclaredAccessibility)
        {
            if (orderedByAccessibility[i].DeclaredAccessibility < members[i].DeclaredAccessibility)

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private static void AnalyzeSymbol(SymbolAnalysisContext context)
{
    //...
    var members = GetMembersFromClass(classSymbol); //retrieve only methods and properties
    var unorderedMember = GetUnorderedMember(members); //then find the first member that is out of order
    if (unorderedMember != null)
    {
        var rule = new DiagnosticDescriptor(DiagnosticId, Title, $"Move {unorderedMember.Name} lower in the file", Category,
            DiagnosticSeverity.Error, isEnabledByDefault: true, description: Description);
        //now we're creating a rule that tells the user to move the member lower in the file

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using Microsoft.CodeAnalysis.Diagnostics;
using System.Collections.Immutable;
using System;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;
using System.Collections.Generic;
using Microsoft.CodeAnalysis.CSharp;
using System.Linq;

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using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.Diagnostics;

using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections.Immutable;

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using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.CSharp.Syntax;

using System.Linq;
using System.Collections.Immutable;

namespace MyCodeAnalyzers
{
    [DiagnosticAnalyzer(LanguageNames.CSharp)]

bogdanbujdea

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.Rename;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CSharp.Syntax;

using System;
using System.Linq;