Some simple questions

Question

4.00/5 (1 vote)

See more:

Hi everybody,
There are somethings in code i do not know what they mean

First: in this code

XML

public static Nullable<T> DbValueToNullable<T>(object dbValue) where T : struct
        {
            Nullable<T> returnValue = null;

            if ((dbValue != null) && (dbValue != DBNull.Value))
            {
                returnValue = (T)dbValue;
            }

            return returnValue;
        }

What is the meaning of: where T : struct?

Second:
decimal? averagePriceInRange;
What is the meaning of: ( ? ) Question mark?

Thanks

Posted 10-Jun-10 22:03pm

MrLonely_2

Updated 10-Jun-10 22:12pm

Abhinav S

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Abhinav S · Accepted Answer · 2010-06-10T22:11:00

MrProgrammer_78 wrote:
where T : struct

You would want to look into generics for an explanation to this.
This basically means we are constraining the parameter to be a struct.
For more information, see here.

MrProgrammer_78 wrote:
What is the meaning of: ( ? ) Question mark

This is a nullable type. This indicates the averagePriceInRange value can be either a decimal or null.