我已经在调试模式下编译了一些测试代码，并使用ILSpy反映了生成的程序集。这是我得到的IL：
.class private auto ansi beforefieldinit ArrayListBoxAndUnBox.Program
extends [mscorlib]System.Object
{
// Nested Types
.class nested public auto ansi beforefieldinit Point
extends [mscorlib]System.Object
{
// Fields
.field public int32 x
.field public int32 y
// Methods
.method public hidebysig specialname rtspecialname
instance void .ctor () cil managed
{
// Method begins at RVA 0x209f
// Code size 7 (0x7)
.maxstack 8
IL_0000: ldarg.0
IL_0001: call instance void [mscorlib]System.Object::.ctor()
IL_0006: ret
} // end of method Point::.ctor
} // end of class Point
// Methods
.method private hidebysig static
void Main (
string[] args
) cil managed
{
// Method begins at RVA 0x2050
// Code size 59 (0x3b)
.maxstack 2
.entrypoint
.locals init (
[0] class [mscorlib]System.Collections.ArrayList list,
[1] int32 i,
[2] class ArrayListBoxAndUnBox.Program/Point p
)
IL_0000: nop
IL_0001: newobj instance void [mscorlib]System.Collections.ArrayList::.ctor()
IL_0006: stloc.0
IL_0007: ldloc.0
IL_0008: ldc.i4.1
IL_0009: box [mscorlib]System.Int32
IL_000e: callvirt instance int32 [mscorlib]System.Collections.ArrayList::Add(object)
IL_0013: pop
IL_0014: ldloc.0
IL_0015: ldc.i4.0
IL_0016: callvirt instance object [mscorlib]System.Collections.ArrayList::get_Item(int32)
IL_001b: unbox.any [mscorlib]System.Int32
IL_0020: stloc.1
IL_0021: ldloc.0
IL_0022: newobj instance void ArrayListBoxAndUnBox.Program/Point::.ctor()
IL_0027: callvirt instance int32 [mscorlib]System.Collections.ArrayList::Add(object)
IL_002c: pop
IL_002d: ldloc.0
IL_002e: ldc.i4.1
IL_002f: callvirt instance object [mscorlib]System.Collections.ArrayList::get_Item(int32)
IL_0034: castclass ArrayListBoxAndUnBox.Program/Point
IL_0039: stloc.2
IL_003a: ret
} // end of method Program::Main
.method public hidebysig specialname rtspecialname
instance void .ctor () cil managed
{
// Method begins at RVA 0x2097
// Code size 7 (0x7)
.maxstack 8
IL_0000: ldarg.0
IL_0001: call instance void [mscorlib]System.Object::.ctor()
IL_0006: ret
} // end of method Program::.ctor
} // end of class ArrayListBoxAndUnBox.Program
我看到.maxstack设置为2，但是当我手工查看代码时，有时会在评估堆栈上得到3个元素。为什么？我是错误的IL堆栈计数器吗？还是在这后面有含义？
在我的世界中，IL_0014上的第一个ldloc.0从未被删除，但也许只有我自己没有了解get_Item的callvirt的工作方式。当我到达IL_0014时，我必须引用要在堆栈纸上列出的内容，然后在IL_0015，当将0推入评估堆栈时，程序将违反.maxstack。
我是新手，所以一定有不对的地方。也许我的计算是正确的，而我对.maxstack的理解是错误的，或者反之亦然。有人可以告诉我我对.maxstack的理解是否错误，.maxstack会在运行时显示堆栈上的最大元素。还是我的计数错误？ Add是否删除对列表实例的引用？
编辑：
这是我的计算方式。该计数是在IL代码运行之后进行的：
IL_0000: 0 on stack
IL_0001: 1 on stack (the reference to array list)
IL_0006: 0 on stack
IL_0007: 1 on stack (the reference to arraylist)
IL_0008: 2 on stack (reference to arraylist and int 1)
IL_0009: 2 on stack (refernce to arraylist and reference to object that wrap 1)
IL_000e: 2 on stack (reference to arraylist and index to the added boxed int object)
IL_0013: 1 on stack (reference to arraylist)
IL_0014: 2 on stack (reference to arraylist and reference to arraylist)
IL_0015: 3 on stack (reference to arraylist and reference to arraylist and int 0)
我没有计算其余的部分，因为我知道我做错了什么。
谢谢
最佳答案
很难看出您出了错。执行指令后，在左侧标注了堆栈深度：
0 IL_0000: nop
1 IL_0001: newobj instance void [mscorlib]System.Collections.ArrayList::.ctor()
0 IL_0006: stloc.0
1 IL_0007: ldloc.0
2 IL_0008: ldc.i4.1
2 IL_0009: box [mscorlib]System.Int32
1 IL_000e: callvirt instance int32 [mscorlib]System.Collections.ArrayList::Add(object)
0 IL_0013: pop
1 IL_0014: ldloc.0
2 IL_0015: ldc.i4.0
1 IL_0016: callvirt instance object [mscorlib]System.Collections.ArrayList::get_Item(int32)
1 IL_001b: unbox.any [mscorlib]System.Int32
0 IL_0020: stloc.1
1 IL_0021: ldloc.0
2 IL_0022: newobj instance void ArrayListBoxAndUnBox.Program/Point::.ctor()
1 IL_0027: callvirt instance int32 [mscorlib]System.Collections.ArrayList::Add(object)
0 IL_002c: pop
1 IL_002d: ldloc.0
2 IL_002e: ldc.i4.1
1 IL_002f: callvirt instance object [mscorlib]System.Collections.ArrayList::get_Item(int32)
1 IL_0034: castclass ArrayListBoxAndUnBox.Program/Point
0 IL_0039: stloc.2
0 IL_003a: ret
唯一不平凡的是ArrayList.Add（）调用。它弹出两个堆栈值，即ArrayList对象引用和Add（）参数。并向后推，即Add（）的返回值。
编辑后：这确实是您出错的地方。
关于c# - 为我解释maxstack指令，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19575298/