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Posted 4 Jan 2012

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Setting a default value for C# Auto-implemented properties

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5.00/5 (5 votes)
7 Jan 2012CPOL
While leaving aside the performance penalties, it is a reasonable approach to make code cleaner.Though you can further benefit from the extension methods:public static void InitDefaults(this object o){ PropertyInfo[] props = o.GetType().GetProperties(BindingFlags.Public |...
While leaving aside the performance penalties, it is a reasonable approach to make code cleaner.

Though you can further benefit from the extension methods:

public static void InitDefaults(this object o)
    PropertyInfo[] props = o.GetType().GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);

    foreach (PropertyInfo prop in props)
        if (prop.GetCustomAttributes(true).Length > 0)
            object[] defaultValueAttribute =
                prop.GetCustomAttributes(typeof(DefaultValueAttribute), true);

            if (defaultValueAttribute != null)
                DefaultValueAttribute dva = defaultValueAttribute[0] as DefaultValueAttribute;

                if (dva != null)
                    prop.SetValue(o, dva.Value, null);

public MyClass()

Taken from:
Setting Default Values on Automatic Properties[^]


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


About the Author

Oleg Shilo
Program Manager
Australia Australia
I was born in Ukraine. After completing the university degree worked there as a Research Chemist. Last 23 years I live in Australia where I've got my second qualification as a Software Engineer.

"I am the lucky one: I do enjoy what I am doing!"

Comments and Discussions

GeneralI would recommend not including the BindingFlags.Static flag... Pin
Chris Ross 29-Jan-12 22:33
MemberChris Ross 29-Jan-12 22:33 
GeneralReason for my vote of 5 Most simplest and useful solution. Pin
Thornik9-Jan-12 21:20
MemberThornik9-Jan-12 21:20 
GeneralReason for my vote of 5 My 5: avoiding redundant code! Pin
Andreas Gieriet6-Jan-12 12:20
professionalAndreas Gieriet6-Jan-12 12:20 

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