C#•7mo ago

How can I get the memory address of a feilds in C#?

created an object from a class in C#. Is it possible to retrieve its memory location and address using C# code? i have tried this code but i got error at this line IntPtr address = GCHandle.AddrOfPinnedObject(handle); of the code

c#
Person person_1 =  new Person("mina remon shaker");
FieldInfo? fieldInfo = typeof(Person).GetField("Name");
GCHandle handle = GCHandle.Alloc(person_1, GCHandleType.Pinned);
IntPtr address = GCHandle.AddrOfPinnedObject(handle);
handle.Free();
Console.WriteLine("Object address: 0x{0:X}", address.ToInt64());

c#
Person person_1 =  new Person("mina remon shaker");
FieldInfo? fieldInfo = typeof(Person).GetField("Name");
GCHandle handle = GCHandle.Alloc(person_1, GCHandleType.Pinned);
IntPtr address = GCHandle.AddrOfPinnedObject(handle);
handle.Free();
Console.WriteLine("Object address: 0x{0:X}", address.ToInt64());

26 Replies

Jimmacle•7mo ago

do you have a specific goal or are you just experimenting? what's the actual error?

steven preadlyOP•7mo ago

no i just want to excrement i will send you the error

Error    CS1501    No overload for method 'AddrOfPinnedObject' takes 1 arguments    C#ForBeginners    D:\Projects\C#ForBeginners\C#ForBeginners\Program.cs    53    Active

Jimmacle•7mo ago

https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.gchandle.addrofpinnedobject?view=net-8.0 it's an instance method of GCHandle, not static also, fwiw this is certainly not "C# for beginners" you will probably never have to do something like this in a real program

steven preadlyOP•7mo ago

this means that i have to create a new object GCHandle,

Jimmacle•7mo ago

but you have one

GCHandle handle = GCHandle.Alloc(person_1, GCHandleType.Pinned);
IntPtr address = handle.AddrOfPinnedObject();

GCHandle handle = GCHandle.Alloc(person_1, GCHandleType.Pinned);
IntPtr address = handle.AddrOfPinnedObject();

steven preadlyOP•7mo ago

i just want to experiment do you have like some other way to experiment the memory address of a feild

Jimmacle•7mo ago

no, because this is very very uncommon to do in C#

steven preadlyOP•7mo ago

aha

Jimmacle•7mo ago

the memory address of a field isn't useful information in 99.9% of cases

steven preadlyOP•7mo ago

ok got the point all what i know about this that objects and there members got stored in the heap

Jimmacle•7mo ago

yes, instances of classes are always on the heap

steven preadlyOP•7mo ago

i have another small question do i have to learn somthing about the diffreance between the heap and the stack

Jimmacle•7mo ago

it doesn't really matter for beginners that becomes more important to think about when you start optimizing code for high performance

steven preadlyOP•7mo ago

in the matter of fact i am going to use c# for web development ASP.NET , Core and other related to web

Pobiega•7mo ago

then you can quite safely ignore anything related to IntPtr and GCHandle for a long long while, and stack/heap too tbh.

steven preadlyOP•7mo ago

this are handled using browsers in that case corect

Pobiega•7mo ago

$itdepends

MODiX•7mo ago

https://cdn.discordapp.com/attachments/569261465463160900/826859856719380500/1niu5wN.png

Pobiega•7mo ago

ASP.NET is primarily a server component

Jimmacle•7mo ago

in terms of web development C# code usually runs on the server only the only exception is blazor webassembly which is still pretty immature and not a great option for frontend

steven preadlyOP•7mo ago

OK so i don`t have to give any concentration in CG class and optimization of the code

Jimmacle•7mo ago

that's not what i said at some point you will probably have to care about optimization, but if you're just starting to learn then it isn't important

Pobiega•7mo ago

it should certainly not be a primary concern as a beginner

Jimmacle•7mo ago

it's more important to make it work first, then you can worry about making it fast

steven preadlyOP•7mo ago

ok thank you all @Jimmacle @Pobiega

IdiotZ42•7mo ago

Also note that the printed address in your example is tenuous, because after you free the handle the object gets unpinned, and the GC is once again free to move it around in memory however it wishes. (probably won't though, it's designed to be as lazy as possible)

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How can I get the memory address of a feilds in C#?