How to use System.Linq.Enumerable methods?

[thinhbuzz]

I have tried several ways but can't figure out how to call these functions, thanks for the review

const SystemInt32 = getMSCorlibClass('System.Int32');
const List = getMSCorlibClass('System.Collections.Generic.List`1');
const list = List.inflate(SystemInt32).new();
list.method('.ctor', 0).invoke();
list.method('Add').invoke(5);
list.method('Add').invoke(6);
list.method('Add').invoke(7);
console.log(list);
console.log(Enumerable.method('First', 1).inflate(SystemInt32));
console.log(Enumerable.method('First', 1).inflate(SystemInt32).invoke(list));

output

System.Collections.Generic.List`1[System.Int32]
static System.Int32 First(System.Collections.Generic.IEnumerable<System.Int32> source);
Error: access violation accessing 0x0
# in some cases i will get error
Error: abort was called

System.Linq.Enumerable

[vfsfitvnm]

First<System.Int32> doesn't exist in your assembly. As you can see, there's no relative virtual address when printing the inflated method, and its virtualAddress is NULL (hence access violation accessing 0x0).

However, I should probably catch that exception so you immediately know why.

Are you on Windows by any chance? I have to make sure Frida returns the exact same error message

[thinhbuzz]

i have windows device but never tried with windows app.
anyway, thank you for your information, I will check and provide more information

[vfsfitvnm]

new NativeFunction(NULL, "void", [])();

is enough to verify