前因

• 因为ILRuntime热更项目直接打包出来的DLL不能放置到AssetBundle里面打包
• 所以我看网上的代码都是读取DLL的bytes然后放置到一个text文件里面后缀是bytes

public class DefaultPath
{
	public static string ProjectRootPath = Environment.CurrentDirectory;
	/// <summary>
	/// 可读
	/// </summary>
	public static string ReadOnlyStreamingPath = Application.streamingAssetsPath;
	/// <summary>
	/// 可读可写全平台通用
	/// </summary>
	public static string ReadAndWritePath = Application.persistentDataPath;

	/// <summary>
	/// <项目路径>/Assets 仅在编辑器使用 属于unity工程目录下
	/// </summary>
	public static string AssetFolderPath = Application.dataPath;
	//输出路径						
	public static string OutputPath = DefaultPath.AssetFolderPath + "/AddressableFiles/TransformDLL";
	public static string LoadDllPath = OutputPath + "/HotFix_Project_DLL.bytes";
	public static string LoadPDBPath = OutputPath + "/HotFix_Project_PDB.bytes";

	static DefaultPath()
	{
		Debug.Log($"ProjectRootPath_{ProjectRootPath}\n{nameof(ReadOnlyStreamingPath)}_{ReadOnlyStreamingPath}\n{nameof(ReadAndWritePath)}_{ReadAndWritePath}\n{nameof(AssetFolderPath)}_{AssetFolderPath}");
	}



}

public class ILRuntimeHelper
{
	const string srcKey = "SrcDLLPath";
	public static string TargetDll => PathUtility.GetRootPath(srcKey) + "/HotFix_Project.dll";
	public static string TargetPDB => PathUtility.GetRootPath(srcKey) + "/HotFix_Project.pdb";
	public static string OutputPath => DefaultPath.OutputPath;
	public static string LoadDllPath => DefaultPath.LoadDllPath;
	public static string LoadPDBPath => DefaultPath.LoadPDBPath;

	public const string Symbol = "TestRemoteLoadCode";

	[MenuItem("Tools/指定加載DLL的文件夾")]
	private static void SetDLLPath()
	{
		PathUtility.SetRootPath(srcKey);
	}



	[MenuItem("Tools/DllToByte")]
	private static void DLLToBytes()
	{
		if (!File.Exists(OutputPath))
		{
			Directory.CreateDirectory(OutputPath);
		}

		void CheckFileValid(string path, string loadPath)
		{
			if (!File.Exists(path))
			{
				throw new Exception($"不存在指定文件{path}");
			}
			File.WriteAllBytes(loadPath, File.ReadAllBytes(path));
		}

		CheckFileValid(TargetDll, LoadDllPath);
		CheckFileValid(TargetPDB, LoadPDBPath);

		AssetDatabase.Refresh();
	}

}

后果

• 但是这样就很麻烦，因为每次我要先点击热更项目的生成，在生成后再回到Unity里面点击DLLToByte按钮。
• 所以我在热更项目的生成事件里面加入了一个bat命令脚本，当热更项目生成后会自动执行这个命令，这个命令会执行一个程序自动把DLL转换为byte文件放置到Unity对应文件夹里

• call 就是调用的意思，projectDir是内置宏，就是热更项目所在的文件夹
• 
• bat命令和转换的代码
• bat文件的读取和输出文件夹需要自己改成需要的

::切换到bat文件所在的文件夹
cd /d %~dp0
::%NAME%可以引用变量
::set 可以设置变量
set PROJECTNAME=HotFix_Project
set OUTDLLNAME=%PROJECTNAME%_DLL.bytes
set OUTPDBNAME=%PROJECTNAME%_PDB.bytes
set FROMDLLNAME=%PROJECTNAME%.pdb
set FROMPDBNAME=%PROJECTNAME%.dll

set curdir=%cd%
set EXENAME=%curdir%\TransformHotfixDLL.exe

set DLLPATH=%curdir%\bin\%FROMDLLNAME%
set PDBPATH=%curdir%\bin\%FROMPDBNAME%

cd ..
set curdir=%cd%
set OUTDLLPATH=%curdir%\Assets\AddressableFiles\TransformDLL\%OUTDLLNAME%
set OUTPDBPATH=%curdir%\Assets\AddressableFiles\TransformDLL\%OUTPDBNAME%
set OUTPUTPATH=%curdir%\Assets\AddressableFiles\TransformDLL
::start是启动程序 后面的字符串是输入程序的参数
start %EXENAME% "%DLLPATH%|%PDBPATH%|%OUTPUTPATH%|%OUTDLLPATH%|%OUTPDBPATH%" 

• exe文件

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

namespace TransformHotfixDLL
{
	internal class Program
	{
		static void Main(string[] args)
		{
			var paths = args[0].Split('|');
			var fromDLLPath = paths[0];
			var fromPDBPath = paths[1];
			var targetPath = paths[2];
			var LoadPDBPath = paths[3];
			var LoadDllPath = paths[4];

			if (!File.Exists(targetPath))
			{
				Directory.CreateDirectory(targetPath);
			}

			void CheckFileValid(string path, string loadPath)
			{
				if (!File.Exists(path))
				{
					throw new Exception($"不存在指定文件{path}");
				}
				File.WriteAllBytes(loadPath, File.ReadAllBytes(path));
			}

			CheckFileValid(fromDLLPath, LoadDllPath);
			CheckFileValid(fromPDBPath, LoadPDBPath);


		}
	}
}