How to assign default value for a static default property of a class in C#?

Question

Possible Duplicate:
default value for a static property

I am able to assign default value for a normal default property of a class. But i am not able to assign default value for a static default property of a class like below:-

    public class AppInstance
{
    [DefaultValue(25)]
    public static int AppType { get; set; }
}

When I call AppInstance.AppType, it always return 0 instead of 25. Why? How can i solve it without using a private variable declaration?

http://stackoverflow.com/questions/2596344/default-value-for-a-static-property — LaGrandMere, Apr 25 '12 at 14:09
DefaultValue is an attribute for visual components, used usually by Visual Studio designers — Adrian Iftode, Apr 25 '12 at 14:09

Olivier Jacot-Descombes · Accepted Answer · 2014-03-05T14:40:54.447

5

The DefaultValueAttribute only tells the WinForms designer which value is the default value of a property of the form or of a control. If the property has another value, this value will appear bold in the properties window. But it will actually not set the value.

You must assign it a value in the static constructor

static MyClass()
{
    AppType = 25;
}

edited Mar 05 '14 at 14:40

answered Apr 25 '12 at 14:10

Olivier Jacot-Descombes

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Dennis Traub · Answer 2 · 2012-04-25T14:15:04.510

3

You can use a static constructor. It is called automatically to initialize the class before the first instance is created or any static members are referenced.

public class AppInstance
{
    public static int AppType { get; set; }

    static AppInstance()
    {
        AppType = 25;
    }
}

edited Apr 25 '12 at 14:15

answered Apr 25 '12 at 14:09

Dennis Traub

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To whoever downvoted this, mind telling me what's wrong with my answer? – Dennis Traub Apr 25 '12 at 14:20
It doesn't comment as to the problem with using the default value attribute, which is what was really confusing the OP. – Servy Apr 25 '12 at 14:38

score 1 · Answer 3 · answered Apr 25 '12 at 14:11

1

I don't see the use for an static member to be created by using get; set; in this scenario. Maybe somebody else can?

So, I would probably just do this:

public class AppInstance
{
    public static int AppType = 25;
}

answered Apr 25 '12 at 14:11

Davin Tryon

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uh, drive by downvote. Explanation please. – Davin Tryon Apr 25 '12 at 16:10

How to assign default value for a static default property of a class in C#?

3 Answers3