How 'read-only' are read-only properties?

[Rakesh]

Hi,

Suppose I have a class definition like this:
public class CBase
{
public string m_Name = "asd";

public string Name
{
get
{
return m_Name;
}
}
}

Even though 'Name' is a read-ionly property, I can do this:
CBase c1 = new CBase();
c1.Name.Remove( 0, 2);

So what's the point is declaring a get-only property?

Thanks,
Rakesh

[Miha Markic]

Hi Rakesh,

You can't change the string instance.
You can modify its content, yes, since string is treated as a class and
readonly properties (as you've stated) don't prevent changing instance
fields.

In the case of simple types like int, bool, etc. it works as one would
thought :)

--
Miha Markic - RightHand .NET consulting & software development
miha at rthand com

"Rakesh" <ra************ *@hotmail.com> wrote in message
news:d6******** *************** ***@posting.goo gle.com...

Hi,

Suppose I have a class definition like this:
public class CBase
{
public string m_Name = "asd";

public string Name
{
get
{
return m_Name;
}
}
}

Even though 'Name' is a read-ionly property, I can do this:
CBase c1 = new CBase();
c1.Name.Remove( 0, 2);

So what's the point is declaring a get-only property?

Thanks,
Rakesh

[Morten Wennevik]

It's read only.

cl.Name.Remove( 0,2) doesn't change m_Name in any way, it just returns a
new string.
Though you should make m_Name private or anyone could bypass Name and
handle m_Name directly instead.
--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

Hi,
Read-only in this context means you can't assign to this
property (as no setter method is provided). It doesn't
mean that the returned reference (by the getter) can't be
changed. Doesn't work for value classes of course.
BTW, the Remove method actually creates a new instance of
type String reflecting the change, while the original
string remains unaffected. This happens to be so for all
the other methods, which make it immutable.
Regard,
BV

-----Original Message-----
Hi,

Suppose I have a class definition like this:
public class CBase
{
public string m_Name = "asd";

public string Name
{
get
{
return m_Name;
}
}
}

Even though 'Name' is a read-ionly property, I can do this: CBase c1 = new CBase();
c1.Name.Remove( 0, 2);

So what's the point is declaring a get-only property?

Thanks,
Rakesh
.

[Jon Skeet [C# MVP]]

<"Miha Markic" <miha at rthand com>> wrote:

You can't change the string instance.
You can modify its content, yes, since string is treated as a class and
readonly properties (as you've stated) don't prevent changing instance
fields.

Well, you *would* be able to, if string weren't immutable.

If Name returned a StringBuilder rather than a string, that would
certainly allow modification.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Miha Markic]

Ouch, right.
Typed too fast, too early in the morning :)

--
Miha Markic - DXSquad/RightHand .NET consulting & software development
miha at rthand com
"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com...

<"Miha Markic" <miha at rthand com>> wrote:

You can't change the string instance.
You can modify its content, yes, since string is treated as a class and
readonly properties (as you've stated) don't prevent changing instance
fields.

Well, you *would* be able to, if string weren't immutable.

If Name returned a StringBuilder rather than a string, that would
certainly allow modification.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[rakesh]

Hi Miha,

So do u mean that we can change the value of read-only
properties exposing objects(not primitive types), but
cannot assign values to them?

Rakesh

-----Original Message-----
Hi Rakesh,

You can't change the string instance.
You can modify its content, yes, since string is treated as a class andreadonly properties (as you've stated) don't prevent changing instancefields.

In the case of simple types like int, bool, etc. it works as one wouldthought :)

--
Miha Markic - RightHand .NET consulting & software developmentmiha at rthand com

"Rakesh" <ra************ *@hotmail.com> wrote in message
news:d6******* *************** ****@posting.go ogle.com...

Hi,

Suppose I have a class definition like this:
public class CBase
{
public string m_Name = "asd";

public string Name
{
get
{
return m_Name;
}
}
}

Even though 'Name' is a read-ionly property, I can do this: CBase c1 = new CBase();
c1.Name.Remove( 0, 2);

So what's the point is declaring a get-only property?

Thanks,
Rakesh

.

[Miha Markic]

Hi rakesh,

An example:

public class Tubo
{
public int Value = 0;
}

public class Tubular
{
private Tubo tubo = new Tubo();

public Tubo Tubo
{
get { return tubo; }
}
}

Tubular t = new Tubular();

you are allowed to:
t.Tubo.Value = 5; // changing the internal value of Tubo

while you won't be able to:
t.Tubo = null;
or
t.Tubo = new Tubo();
since you are trying to write the new t.Tubo property value.

HTH,

--
Miha Markic - RightHand .NET consulting & software development
miha at rthand com

"rakesh" <an*******@disc ussions.microso ft.com> wrote in message
news:08******** *************** *****@phx.gbl.. .

Hi Miha,

So do u mean that we can change the value of read-only
properties exposing objects(not primitive types), but
cannot assign values to them?

Rakesh

-----Original Message-----
Hi Rakesh,

You can't change the string instance.
You can modify its content, yes, since string is treated

as a class and

readonly properties (as you've stated) don't prevent

changing instance

fields.

In the case of simple types like int, bool, etc. it

works as one would

thought :)

--
Miha Markic - RightHand .NET consulting & software

development

miha at rthand com

"Rakesh" <ra************ *@hotmail.com> wrote in message
news:d6******* *************** ****@posting.go ogle.com...

Hi,

Suppose I have a class definition like this:
public class CBase
{
public string m_Name = "asd";

public string Name
{
get
{
return m_Name;
}
}
}

Even though 'Name' is a read-ionly property, I can do this: CBase c1 = new CBase();
c1.Name.Remove( 0, 2);

So what's the point is declaring a get-only property?

Thanks,
Rakesh

.

[Chops]

Even though, of course 'read-only' is meant to mean exactly that. One can work-around this fact by eithe
locking the member or class

Thought it would help
Chop

----- Miha Markic wrote: ----

Hi rakesh

An example

public class Tub

public int Value = 0
public class Tubula

private Tubo tubo = new Tubo()

public Tubo Tub

get { return tubo;

Tubular t = new Tubular()

you are allowed to
t.Tubo.Value = 5; // changing the internal value of Tub

while you won't be able to
t.Tubo = null
o
t.Tubo = new Tubo()
since you are trying to write the new t.Tubo property value

HTH

--
Miha Markic - RightHand .NET consulting & software developmen
miha at rthand co

"rakesh" <an*******@disc ussions.microso ft.com> wrote in messag
news:08******** *************** *****@phx.gbl..

Hi Miha

So do u mean that we can change the value of read-onl

properties exposing objects(not primitive types), bu
cannot assign values to them

Rakes

-----Original Message----

Hi Rakesh

You can't change the string instance

You can modify its content, yes, since string is treate

as a class an

readonly properties (as you've stated) don't preven

changing instanc

fields

In the case of simple types like int, bool, etc. i works as one woul

thought :

--

Miha Markic - RightHand .NET consulting & softwar

developmen

miha at rthand co

"Rakesh" <ra************ *@hotmail.com> wrote in messag

news:d6****** *************** *****@posting.g oogle.com..

Hi
>> Suppose I have a class definition like this
public class CBas

public string m_Name = "asd"
>> public string Nam

ge

return m_Name

>> Even though 'Name' is a read-ionly property, I can d

this CBase c1 = new CBase()
c1.Name.Remove( 0, 2)
>> So what's the point is declaring a get-only property
>> Thanks
Rakes
>>