如何自动生成 Entity Framework 的 Mapping 文件？

Program.cs

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);
        }
    }
}

 

.csproj

<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>

 

 

CodeTemplate.txt

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
    }
}