How to return "Empty" as a value in custom objects in c#

Question

0.00/5 (No votes)

See more:

I have a custom Object, called fileSize and it holds two variables. In the same way a string's value can be String.Empty(). I would like to do the same with my object, to assign fileSize.Empty to a variable, but not sure how. The code below shows the custom object class.

C#

public class fileSize
{
    int minSize;
    int maxSize;

    public  fileSize(int MinSize, int MaxSize)
    {
        minSize=MinSize;
        maxSize=MaxSize;
    }
}

Any help's appreciated.

Posted 12-Sep-11 7:57am

User 7013725

Add a Solution

3 solutions

Solution 1

create nullables int? minSize and int? maxSize

a private bool empty
a public bool Empty

C#

public bool Empty {
get { return minSize == null && maxSize == null; } 
}

Posted 12-Sep-11 8:03am

Herman<T>.Instance

Updated 12-Sep-11 8:05am

v2

Solution 2

Add something like that ::

C#

<code>
public static fileSize Empty{
get { return new fileSize(0,0); }
}
</code>

:)

Posted 12-Sep-11 8:20am

Caner Korkmaz

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)

BillWoodruff · Accepted Answer · 2011-09-12T09:47:00

It's interesting to think about the "edge case" where the user creates an instance of the 'fileSize' object, supplying one valid int, and the other argument null: what's the right thing to do in that case ?

Should you throw an error in the constructor in that case ?

Here's some ideas:

C#

public class fileSize
{
    int? minSize;
    int? maxSize;

    public bool IsEmpty { get; set; }

    // 'empty' constructor
    public fileSize()
    {
        minSize = null;
        maxSize = null;
        IsEmpty = true;
    }

    // potentially 'non-empty' constructor
    public fileSize(int? MinSize, int? MaxSize)
    {
        minSize = MinSize;
        maxSize = MaxSize;

        // is this the logic you really want here ?
        IsEmpty = minSize == null || maxSize == null;
    }
}

Tests:

fileSize f1 = new fileSize();
Console.WriteLine(f1.IsEmpty);

fileSize f2 = new fileSize(null,null);
Console.WriteLine(f2.IsEmpty);

fileSize f3 = new fileSize(100, 200);
Console.WriteLine(f3.IsEmpty);

fileSize f4 = new fileSize(100, null);
Console.WriteLine(f4.IsEmpty);