Problem with assigning the result of [string].IndexOf into a const int?

[Duncan Smith]

Having a cpp background I'm curious why I can't do the following:

const int openElementPosition = strXmlLine.IndexOf("<RacingNumber");

without getting the following error:

Error 1 The expression being assigned to 'closeElementPosition' must
be constant

If I drop the const then everything is fine, but I don't ever want to
change the value of openElementPosition so it would be better/safer as
a const. Assuming IndexOf returns a scalar integer value, why
shouldn't I be free to store it in a const variable?

Confused,

Duncan.

[Lebesgue]

try to specify the field as readonly instead of const - these can be set
once with a non-constant value

"Duncan Smith" <DS********@googlemail.comwrote in message
news:11**********************@v33g2000cwv.googlegr oups.com...

Having a cpp background I'm curious why I can't do the following:

const int openElementPosition = strXmlLine.IndexOf("<RacingNumber");

without getting the following error:

Error 1 The expression being assigned to 'closeElementPosition' must
be constant

If I drop the const then everything is fine, but I don't ever want to
change the value of openElementPosition so it would be better/safer as
a const. Assuming IndexOf returns a scalar integer value, why
shouldn't I be free to store it in a const variable?

Confused,

Duncan.

[Duncan Smith]

On Feb 6, 5:06 pm, "Lebesgue" <[e-mail]:

try to specify the field as readonly instead of const - these can be set
once with a non-constant value

Apparently this only works on member variables and not variables local
to the method. For if I try:

readonly int openElementPosition =
strXmlLine.IndexOf("<RacingNumber");

I get the error:

Error 2 The modifier 'readonly' is not valid for this item

[Lebesgue]

You can not give any specifiers to local variables (in-method) in C#. It's
up to you to know what you are doing in your method.

"Duncan Smith" <DS********@googlemail.comwrote in message
news:11**********************@q2g2000cwa.googlegro ups.com...

On Feb 6, 5:06 pm, "Lebesgue" <[e-mail]:

>try to specify the field as readonly instead of const - these can be set
once with a non-constant value

Apparently this only works on member variables and not variables local
to the method. For if I try:

readonly int openElementPosition =
strXmlLine.IndexOf("<RacingNumber");

I get the error:

Error 2 The modifier 'readonly' is not valid for this item

[Duncan Smith]

On Feb 6, 5:50 pm, "Lebesgue" <[e-mail]:

You can not give any specifiers to local variables (in-method) in C#. It's
up to you to know what you are doing in your method.

"Duncan Smith" <[e-mail] in message

news:11**********************@q2g2000cwa.googlegro ups.com...

On Feb 6, 5:06 pm, "Lebesgue" <[e-mail]:

try to specify the field as readonly instead of const - these can be set
once with a non-constant value

Apparently this only works on member variables and not variables local
to the method. For if I try:

readonly int openElementPosition =
strXmlLine.IndexOf("<RacingNumber");

I get the error:

Error 2 The modifier 'readonly' is not valid for this item

Groan! Remind me to check in again on C# in another three years...

Thanks anyway.

Duncan.

[Barry Kelly]

Duncan Smith wrote:

On Feb 6, 5:50 pm, "Lebesgue" <[e-mail]:

You can not give any specifiers to local variables (in-method) in C#. It's
up to you to know what you are doing in your method.

Groan! Remind me to check in again on C# in another three years...

This feature won't be in C# in three years.

-- Barry

--
http://barrkel.blogspot.com/