How to check property is set or not? In C#.

Question

0.00/5 (No votes)

See more:

Hi,
I have some integer properties in my class, i am instantiate the class and set some property to some value and I am not setting some property but its taking default value to 0,
so I don't want that not setted properties,
so how to check property is set or not?
can any one suggest me?

thanks in advance
sushil

What I have tried:

class Class1
{
public int SomePropery1{get; set}
public int SomeMoreProp{get; set;}
}

class1 c1 = new class1()
c1.SomePropery1 = 1;

Posted 2-Sep-16 0:19am

Member 11859517

Updated 3-Sep-16 19:34pm

v2

Add a Solution

2 solutions

Solution 2

If these Integer Properties have some consistent regular feature, and you don't want to use the Nullable Int Type, as Mehdi suggested, you could do something like this

C#

public class YourClass
{
    public const Int32 INTNOTSET = Int32.MinValue;

    public int Int1 { set; get; }

    public YourClass()
    {
        Int1 = INTNOTSET;
    }
}

Then you would test if the property is initialized like this:

YourClass yourClass = new YourClass();

if (yourClass.Int1 == YourClass.INTNOTSET)
{
   // Int1 uninitialized 
}
else
{
   // Int1 value set  
}

Note that defining INTNOTSET as a Constant in 'YourClass results in it being a static Field of the Class which must be accessed via the reference to the Class itself.

Without knowing more about what your App is and what it does, and the shared aspects of your Int variables, and their uses (if any), evaluating the relevance of any technique is crystal-ball gazing :) However, if your Int Properties are there to hold values returned from querying databases, then, you probably do want to use Nullable Int.

Use of Nullable Types does not cause boxing and un-boxing, but does add some overhead, but so would the technique shown here, or any other technique.

Depending on the context, in one scenario using a Dictionary<string,int> might be useful, and so forth.

Posted 3-Sep-16 19:34pm

BillWoodruff

Updated 3-Sep-16 19:48pm

v3

Comments

Member 11859517 6-Sep-16 0:46am

thanks BillWoodruff

Member 11859517 6-Sep-16 1:01am

i have more propery, int,bool,string, long, ...
and i anm doing somthing like this

Dictionary<string, object=""> dic = new Dictionary<string, object="">();
foreach (PropertyInfo pi in myObject.GetType().GetProperties())
{
if (pi.PropertyType == typeof(string))
{
....here i want to check property is set or not ....
string value = (string)pi.GetValue(myObject, null);
if (!string.IsNullOrEmpty(value))
{
dic.Add(pi.Name, value);
}
}
if (pi.PropertyType == typeof(int?))
{
....here i want to check property is set or not ....
int value = (int)pi.GetValue(myObject, null);
if (value != null)
dic.Add(pi.Name, value);
}
}
in my class more properties, I am setting only 2 5 prop. T want to check property is set or no,,,

plz have some idea..

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)

Mehdi Gholam · Accepted Answer · 2016-09-02T00:35:00

Solution 1

Try null-able types :
http://www.dotnetperls.com/nullable-int[^]
Using Nullable Types (C# Programming Guide)[^]

Posted 2-Sep-16 0:35am

Mehdi Gholam

Comments

Member 11859517 2-Sep-16 6:52am

do you know nullable added in which .net framework?

Mehdi Gholam 2-Sep-16 6:56am

Since .net v2.0

Member 11859517 2-Sep-16 7:01am

thanks Mehdi,

but i have more than 50 prop. is there any generic way to do this?

Mehdi Gholam 2-Sep-16 7:15am

Find and replace with a ? at the end.

Member 11859517 6-Sep-16 2:08am

hi mehdi,
as u told use nullable
i have more propery, int,bool,string, long, ...
and i anm doing somthing like this

Dictionary<string, object=""> dic = new Dictionary<string, object="">();
foreach (PropertyInfo pi in myObject.GetType().GetProperties())
{
if (pi.PropertyType == typeof(string))
{
....here i want to check property is set or not ....How?
string value = (string)pi.GetValue(myObject, null);
if (!string.IsNullOrEmpty(value))
{
dic.Add(pi.Name, value);
}
}
if (pi.PropertyType == typeof(int?))
{
....here i want to check property is set or not ....how?
int value = (int)pi.GetValue(myObject, null);
if (value != null)
dic.Add(pi.Name, value);
}
}
in my class more properties, I am setting only 2 5 prop. T want to check property is set or no,,,