zoukankan      html  css  js  c++  java
  • C#反射之使用绑定句柄减少进程的内存消耗

    最近在看反射方面的东西的时候,看到最后发现一个与内存优化相关的东西,在此记录一下:

    以下是文中介绍的 MethodInfo 和 RuntimeMethodHandle 相互转换测试代码:

     1 using System;
     2 using System.Collections.Generic;
     3 using System.Diagnostics;
     4 using System.Reflection;
     5 
     6 namespace GenDLL
     7 {
     8     class Class1
     9     {
    10         const BindingFlags bFlags = BindingFlags.FlattenHierarchy | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
    11         public static void Main(string[] args)
    12         {
    13             //显示在任何反射操作之前的堆栈的大小
    14             Show("Before doing anying");
    15 
    16             //为MSCorlib.dll中的所有方法构建 MethodInfo 对象缓存
    17             List<MethodBase> methodInfoList = new List<MethodBase>();
    18             //遍历定义  Object 类的程序集中定义的公共类型
    19             foreach (Type type in typeof(Object).Assembly.GetExportedTypes())
    20             {
    21                 //过滤任何泛型的类型
    22                 if (type.IsGenericTypeDefinition) continue;
    23                 MethodBase[] array = type.GetMethods(bFlags);
    24                 methodInfoList.AddRange(array);
    25             }
    26 
    27             //显示当绑定所有方法之后,方法的个数和堆的大小
    28             Console.WriteLine("# of method = {0:N0} ", methodInfoList.Count);
    29             Show("After building cache of MethodInfo Object");
    30 
    31             //为所有的 MethodInfo 对象构建 RuntimeMethodHandle缓存
    32             List<RuntimeMethodHandle> methodHandles = methodInfoList.ConvertAll<RuntimeMethodHandle>(mb => mb.MethodHandle);
    33             Show("Holding MethodInfo and RuntimeMethodHandle of cache");
    34             GC.KeepAlive(methodInfoList);   //阻止缓存被过早的回收
    35             methodInfoList = null;          //现在允许进行回收
    36             Show("After free MethodInfo Objects");
    37 
    38             methodInfoList = methodHandles.ConvertAll<MethodBase>(rmh => MethodBase.GetMethodFromHandle(rmh));                  //方式一
    39             // methodInfoList = methodHandles.ConvertAll<MethodBase>(rmh => { return MethodBase.GetMethodFromHandle(rmh); });   //方式二
    40             Show("Size of heap  After re-creating MethodInfo Objects");
    41 
    42             GC.KeepAlive(methodInfoList);   //阻止缓存被过早的回收
    43             GC.KeepAlive(methodHandles);    //阻止缓存被过早的回收
    44 
    45             methodInfoList = null;
    46             methodHandles = null;
    47 
    48             Show("After freeing  MethodInfos and RuntimeMethodHandles");
    49 
    50             Console.ReadLine();
    51         }
    52 
    53         static void Show(string str)
    54         {
    55             //用逗号隔开的数字,0 表示占位符   12:N0 表示用逗号分隔数字,至少占12个字符,小数点后的位数为0
    56             string format = "Heap Size = {0,12:N0} - {1}";
    57             Console.WriteLine(format, GC.GetTotalMemory(true), str);
    58         }
    59     }
    60 }

    编程小知识之 GC.KeepAlive :https://blog.csdn.net/tkokof1/article/details/92073033

  • 相关阅读:
    PHP实现栈(Stack)数据结构
    为什么推荐std::string而不是char*
    PHP实现插入排序算法
    OpenCms Application dev-ref
    OpenCMS integration with Spring MVC--reference
    安装opencms时遇到问题及解决方法
    Java ZIP File Example---refernce
    Top 10 Algorithms for Coding Interview--reference
    JVMInternals--reference
    java code to byte code--partone--reference
  • 原文地址:https://www.cnblogs.com/luguoshuai/p/12871330.html
Copyright © 2011-2022 走看看