检查现场对内存转储所有实例 [英] inspect field on all instances in memory dump
问题描述
我有我用来解决客户问题，内存转储。这是一个.NET（C＃）应用程序。在我的申请的问题是，正在创建特定类的情况太多。有此上课的时候应该有类似20.我想遍历所有这些实例，并调用每个这些实例的名称字段6300实例。有没有简单的方法来做到这一点在WinDbg中/ SOS？
I have a memory dump that I'm using to troubleshoot a client issue. This is a .NET (C#) application. The problem with my application is that too many instances of a particular class are being created. There are 6300 instances of this class when there should be something like 20. I want to loop through all of those instances and call the name field of each of those instances. Is there any easy way to do this in WinDbg/SOS?
我知道我可以使用！dumpheap型{}类型名称找到该类的所有实例，但我不知道我怎么能扩大它们并查看我感兴趣的领域。
I know I can use !dumpheap -type {typename} to find all the instances of that class, but I'm not sure how I can expand them all and view the field I am interested in.
推荐答案
之内的Windbg你可以用 .foreach 执行此命令。
You can do this with .foreach command within Windbg.
下面是一个简单的例子
using System;
using System.Collections.Generic;
using System.Linq;
namespace Test
{
class Program
{
static List<Program> list = new List<Program>();
int i;
string test;
Foo f;
static void Main(string[] args)
{
for (int i = 0; i < 10; i++)
{
list.Add(new Program() { i = i, test = "Test" + i.ToString(), f = new Foo(i) });
}
Console.Read();
}
}
class Foo
{
int j;
public Foo(int i)
{
j = i;
}
}
}
在！dumpheap 具有只会返回对象地址的短选项。在实例中我调试MT为计划是00293858
The !dumpheap has a short option which would just return the object address. In the instance i am debugging MT for Program is 00293858
!dumpheap -mt 00293858 -short
下面是一个code转储中的所有对象 .foreach（$ OBJ {！dumpheap -mt 00293858 -short}）{！做$ OBJ} 使用foreach构造。的$物镜将获得分配与对象的地址。这里距离foreach循环输出样本
Here is a code to dump all the objects .foreach ($obj {!dumpheap -mt 00293858 -short}) {!do $obj} using the foreach construct. The $obj would get assigned with the address of the object. And here is the sample output from the foreach loop
Name: Test.Program
MethodTable: 00293858
EEClass: 00291440
Size: 20(0x14) bytes
File: c:\users\nsrinivasan\documents\visual studio 2010\Projects\Test\Test\bin\Debug\Test.exe
Fields:
MT Field Offset Type VT Attr Value Name
5c2e2978 4000002 c System.Int32 1 instance 3 i
5c2df9ac 4000003 4 System.String 0 instance 0217c144 test
00293bfc 4000004 8 Test.Foo 0 instance 0217c15c f
002938b4 4000001 4 ...t.Program, Test]] 0 static 0217b97c list
Name: Test.Program
MethodTable: 00293858
EEClass: 00291440
Size: 20(0x14) bytes
File: c:\users\nsrinivasan\documents\visual studio 2010\Projects\Test\Test\bin\Debug\Test.exe
Fields:
MT Field Offset Type VT Attr Value Name
5c2e2978 4000002 c System.Int32 1 instance 4 i
5c2df9ac 4000003 4 System.String 0 instance 0217c18c test
00293bfc 4000004 8 Test.Foo 0 instance 0217c1a4 f
002938b4 4000001 4 ...t.Program, Test]] 0 static 0217b97c list
现在，我们有这个，下一步是让程序的每个实例中的现场考这里是code要做到这一点
Now that we have this , the next step is to get the field "test" within each instance of program and here is the code to do that
.foreach ($obj {!dumpheap -mt 00293858 -short}) {!do poi(${$obj}+0x4)}
我使用foreach循环中的 POI 命令。从上面的结果，我们可以做出来的测试变量是在4偏移，这对使用 POI（$ {$ OBJ} +为0x4的原因）
在这里，从上面的foreach输出样本
I am using poi command within the foreach loop. From the above result we can make out the test variable is in the 4 offset and that's the reason for using poi(${$obj}+0x4)
And here is the sample output from the above foreach
0:004> .foreach ($obj {!dumpheap -mt 00293858 -short}) {!do poi(${$obj}+0x4)}
Name: System.String
MethodTable: 5c2df9ac
EEClass: 5c018bb0
Size: 24(0x18) bytes
File: C:\Windows\Microsoft.Net\assembly\GAC_32\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll
String: Test0
Fields:
MT Field Offset Type VT Attr Value Name
5c2e2978 40000ed 4 System.Int32 1 instance 5 m_stringLength
5c2e1dc8 40000ee 8 System.Char 1 instance 54 m_firstChar
5c2df9ac 40000ef 8 System.String 0 shared static Empty
>> Domain:Value 002f76c0:02171228 <<
Name: System.String
MethodTable: 5c2df9ac
EEClass: 5c018bb0
Size: 24(0x18) bytes
File: C:\Windows\Microsoft.Net\assembly\GAC_32\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll
String: Test1
Fields:
MT Field Offset Type VT Attr Value Name
5c2e2978 40000ed 4 System.Int32 1 instance 5 m_stringLength
5c2e1dc8 40000ee 8 System.Char 1 instance 54 m_firstChar
5c2df9ac 40000ef 8 System.String 0 shared static Empty
>> Domain:Value 002f76c0:02171228 <<
这里是为计划类
.foreach ($obj {!dumpheap -mt 00293858 -short}) {!do poi(${$obj}+0x8)}
本富是在8偏移，这里是样本上面的foreach输出
The Foo is in the 8th offset and here is sample the output for the above foreach
Name: Test.Foo
MethodTable: 00293bfc
EEClass: 0029194c
Size: 12(0xc) bytes
File: c:\users\nsrinivasan\documents\visual studio 2010\Projects\Test\Test\bin\Debug\Test.exe
Fields:
MT Field Offset Type VT Attr Value Name
5c2e2978 4000005 4 System.Int32 1 instance 0 j
Name: Test.Foo
MethodTable: 00293bfc
EEClass: 0029194c
Size: 12(0xc) bytes
File: c:\users\nsrinivasan\documents\visual studio 2010\Projects\Test\Test\bin\Debug\Test.exe
Fields:
MT Field Offset Type VT Attr Value Name
5c2e2978 4000005 4 System.Int32 1 instance 1 j
编辑： - 而且，这里是一个<一个href="http://blogs.msdn.com/b/tess/archive/2007/09/18/debugging-script-dumping-out-asp-net-session-contents.aspx">post从苔丝倾销会话内容
- Also here is a post from Tess on dumping session contents
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