如何自动生成 Entity Framework 的 Mapping 文件？

using System;

using System.IO;

using System.Text;

using System.Text.RegularExpressions;

namespace Migration

{

    class Program

    {

        static void Main(string[] args)

        {

            string contextFileFullPath = @"D:\\Projects\Context\Context.cs";

            string contextContent = File.ReadAllText(contextFileFullPath, Encoding.UTF8);

            string savedParentFoldFullPath = @"D:\Mapping";

            string regexFindText = @"\s{12}modelBuilder\.Entity\<(?<entityName>\w+)\>\(entity\s*\=\>\S*\s*\{(?<innerCode>[\s\S]*?)\s{13}?\}\)\;";

            if (Regex.IsMatch(contextContent, regexFindText))

            {

                Match matchItem = Regex.Match(contextContent, regexFindText, RegexOptions.Multiline | RegexOptions.IgnoreCase);

                while (matchItem.Success)

                {

                    string entityName = matchItem.Groups["entityName"].Value;

                    string innerCode = matchItem.Groups["innerCode"].Value;

                    WriteToFile(entityName, innerCode, savedParentFoldFullPath);

                    matchItem = matchItem.NextMatch();

                }

                Console.WriteLine("The regular expressions are correct, perfect！");

            }

            else

            {

                Console.WriteLine("The regular expression is incorrect, please modify！");

            }

            Console.ReadLine();

        }

        static void WriteToFile(string entityName, string innerCode, string savedParentFoldFullPath)

        {

            string templateRelativePath = "CodeTemplate.txt";

            string templateFullPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, templateRelativePath);

            string templateContent = File.ReadAllText(templateFullPath, Encoding.UTF8);

            if (!Directory.Exists(savedParentFoldFullPath))

            {

                try

                {

                    Directory.CreateDirectory(savedParentFoldFullPath);

                }

                catch (Exception ex)

                {

                    Console.WriteLine("目录 {0} 创建失败！", ex.Message);

                    return;

                }

            }

            string fileNameWithoutPath = string.Format("{0}Map.cs", entityName);

            string savedSingleFileFullPath = Path.Combine(savedParentFoldFullPath, fileNameWithoutPath);

            string singleFileContent = templateContent

                .Replace("{#entityName#}", entityName)

                .Replace("{#innerCode#}", innerCode);

            File.WriteAllText(savedSingleFileFullPath, singleFileContent, Encoding.UTF8);

        }

    }

}

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>

    <OutputType>Exe</OutputType>

    <TargetFramework>netcoreapp2.2</TargetFramework>

  </PropertyGroup>

  <ItemGroup>

    <None Update="CodeTemplate.txt">

      <CopyToOutputDirectory>Always</CopyToOutputDirectory>

    </None>

  </ItemGroup>

</Project>

using Microsoft.EntityFrameworkCore;

using Microsoft.EntityFrameworkCore.Metadata.Builders;

using XXX.Domain.Core;

using XXX.Ef.Mapping;

namespace XXX.Data.Ef.Mapping

{

    public class {#entityName#}Map : EntityTypeConfiguration<{#entityName#}>

    {

        #region Methods

        /// <summary>

        /// Configures the entity

        /// </summary>

        /// <param name="builder">The builder to be used to configure the entity</param>

        public override void Configure(EntityTypeBuilder<{#entityName#}> entity)

        {

            {#innerCode#}

        }

        #endregion

    }

}