引用类型的只读属性-真的吗？

Question

In my DDD pattern, I am exposing SqlConnection read-only property to my DAL class object. But as SqlConnection is reference type, I can still call .Dispose() method eventhough it's read-only.

The same thing happened to List<> which I resolved by converting it to ReadOnlyCollection but I happen to use many other core .NET reference type object as read-only property and cannot afford to create wrapper class.

Any resolution?

public class DbContext
{
    public SqlConnection sqlConnection {get; private set; }
}

public class caller
{
   public caller()
   {
       var dbContext = new DbContext();
       dbContext.sqlConnection.Dispose(); // Want to hide Dispose() method
   }
}

Answer 1

The readonly modifier only applies to the reference, not to the actual instance (being referenced).

class Foo
{
    public readonly Bar Bar1;
    public Bar Bar2 { get; } 
    ...
}

You can still say f.Bar1.Prop = 1; but because of the readonly you can't do f.Bar1 = null; . The same for Bar2.