Given this class...
public class Test
{
private long _id;
public Test(long id)
{
_id = id;
}
}
Will the .Net compiler actually compile it as...
public class Test
{
private readonly long _id;
public Test(long id)
{
_id = id;
}
}
In other words, does it understand that _id is only ever set from the constructor and is, therefore, readonly?
No, the compiler does not do that. The IL code for the field will be like this:
.field private int64 _id
...while a readonly version would get this IL code:
.field private initonly int64 _id
The compiler cannot possibly know that a field is set only in the constructor. Imagine for example using reflection in some method where the name of the field is read from a database. You need to explicitly specify the readonly
keyword if you want the field to be immutable.
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