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Discussion on: Interview question: heap vs stack (C#)

akashkava profile image
Akash Kava • Edited

Type is something you can always do typeof(x), you can never do type of (field of (class/struct)). Example,

    struct A {
       ? a;
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First of all you can never do typeof(A.a) because a is a field of type, it is not a type !

FieldInfo.FieldType is type of field, field is not type. Again, value type is a type, which you can safely do typeof(int), typeof(string), anything that can sit inside typeof expression is a type, field is not type.

Here, A is a type, since it is a struct, it will always be on stack unless captured by lambda. And whatever may be the type field a, A will always be on stack !! Member of a type is not type !! Field/Method/Property all are member of type and allocation will never depend on them. If a is string, it is reference, but string is a type, a is not type, and A will still sit on stack and contents of string will be on heap and a will store reference and entire object will sit on stack.

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tyrrrz profile image
Alexey Golub Author

You can do A.a.GetType() to get the field type. Field type can be value type. I'm not talking about field being a type.

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