Error related to Constructor Method in Structure in C# programming?!!!

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Hi all
this is my example of Structure and i can't understand Error happened!

C#

struct Book
    {
        // Property
        public string Author { get; set; }
        public string Title { get; set; }
        private int copyright;
        public int Copyright
        {
            set
            {
                if (value < 2000)
                    Console.WriteLine("\n this copyright is not valid");
                else
                    this.copyright = value;
            }
            get { return this.copyright; }
        }
        // Constructors
        public Book(string a, string t, int c)
        {
            Author = a; // Error happened!
            Title = t;
            Copyright = c;
        }
    }

Error: Backing field for automatically implemented property '.Book.Author' must be fully assigned before control is returned to the caller. Consider calling the default constructor from a constructor initializer.

Posted 22-Oct-12 23:20pm

AlirezaDehqani

Updated 22-Oct-12 23:31pm

Richard MacCutchan

v2

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3 solutions

Solution 1

Have a look at this thread, which explains the issues and a fix.

http://stackoverflow.com/questions/1449871/what-is-happening-here-how-can-i-call-the-default-constructor-when-there-is-non[^]

Posted 22-Oct-12 23:28pm

Dylan Morley

Solution 3

The problem is your copyright field:

C#

public Book(string a, string t, int c)
    {
    copyright = c;
    Author = a;
    Title = t;
    Copyright = c;
    }

Will fix it!

Posted 22-Oct-12 23:31pm

OriginalGriff

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MT_ · Accepted Answer · 2012-10-22T23:30:00

Hi,

Somehow, automatic properties in struct do have some issue.

Instead of

public string Author { get; set; }

use following

C#

private int _Author ; 
public int Author 
{         
get { return _Author ; }         
set { _Author = value; }     
}

See http://social.msdn.microsoft.com/Forums/en/vcsharpexpress2008prerelease/thread/31904232-e43b-455d-bd6a-c04c92c334ce[^] for more details.

Hope that helps, If it does, mark the answer as solution/upvote.

Thanks
Milind