EF Core Model Builder extensions to apply global conventions

Context.cs

using Microsoft.EntityFrameworkCore;

namespace Microsoft.EntityFramework.Conventions.Extensions
{
    public class Context : DbContext
    {
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.SetGlobalMaxLength(200);
            modelBuilder.SetGlobalTablePrefix("tbl_");
            base.OnModelCreating(modelBuilder);
        }
    }
}

ModelBuilderExtensions.cs

using System;
using System.Linq;
using Microsoft.EntityFrameworkCore;

namespace Microsoft.EntityFramework.Conventions.Extensions
{
    public static class ModelBuilderExtensions
    {
        public static void SetGlobalMaxLength(this ModelBuilder modelBuilder, int maxLength)
        {
            if (maxLength == default)
            {
                throw new ArgumentNullException(nameof(maxLength));
            }

            foreach (var entity in modelBuilder.Model.GetEntityTypes())
            {
                foreach (var property in entity.GetProperties().Where(p => p.ClrType == typeof(string)))
                {
                    property.SetMaxLength(maxLength);
                }
            }
        }

        public static void SetGlobalTablePrefix(this ModelBuilder modelBuilder, string prefix, bool useLowercase = true)
        {
            foreach (var entity in modelBuilder.Model.GetEntityTypes())
            {
                var tableName =
                    useLowercase ?
                    $"{prefix}entity.ClrType.Name".ToLower()  :
                    $"{prefix}entity.ClrType.Name";

                modelBuilder.Entity(entity.Name).ToTable(tableName);
            }
        }
    }
}