.net - GC.GetTotalMemory(false) 和 GC.GetTotalMemory(true) 有什么区别

Question

有人可以告诉我 GC.GetTotalMemory(false) 和 GC.GetTotalMemory(false) 之间的区别吗？GC.GetTotalMemory(true);

我有一个小程序，当我比较结果时，第一个循环给出一个 put put for GC.GetTotalMemory(true);和 <循环计数 0 Diff = 0> for GC.GetTotalMemory(false);但不应该是相反的吗？

类似地，循环的其余部分打印一些数字，这两种情况都不同。这个数字表示什么。为什么它会随着循环的增加而变化。

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;

namespace test
{   
   struct Address
   {
       public string Street;
   }
   class Details
   {
      public string Name ;
      public Address address = new Address();

   }
   class emp :IDisposable
   {
       public Details objb = new Details();       
       bool disposed = false;
       #region IDisposable Members
       public void Dispose()
       {
           Disposing(true);
       }
       void Disposing(bool disposing)
       {
           if (!disposed)
               disposed = disposing;
           objb = null;           
           GC.SuppressFinalize(this);
       }

       #endregion
   }


    class Program
    {       
        static void Main(string[] args)
        {        
           long size1 = GC.GetTotalMemory(false);
           emp empobj = null;          
           for (int i = 0; i < 200;i++ )
           {
              // using (empobj = new emp()) //------- (1)
               {
                   empobj = new emp(); //------- (2)
                   empobj.objb.Name = "ssssssssssssssssss";
                   empobj.objb.address.Street = "asdfasdfasdfasdf";
               }

              long size2 = GC.GetTotalMemory(false);             
              Console.WriteLine( "loop count " +i + "  Diff = " +(size2-size1));

           }
        }

    }
}

Answer 1

该参数定义是否要等到垃圾回收发生后才运行。

参见GC.GetTotalMemory(Boolean) Method :

Parameters

forceFullCollection

Type: System.Boolean
true to indicate that this method can wait for garbage collection to > occur before returning; otherwise, false.

diff 仍然为 0 的原因可能是因为即使您传递 false 也已经发生了 GC。