A field initializer cannot reference the non-static field, method, or property

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Hello
I have many forms in my project, all forms retrive data one form (main) by :

C#

main frm = new main();

then use all resource from form(main).
just one form, give me the following error(Error 1 A field initializer cannot reference the non-static field, method, or property );
the error appear here:

private TreeNode<PictureNode> root = new TreeNode<PictureNode>(new PictureNode(frm.DataGridView3.Rows[0].Cells[1].Value.ToString(), Image.FromFile(id + ".jpg")));

at   frm

how i can fix this problem.
thank you

What I have tried:

i suppose that it is the scope, but i can not solve it.

Posted 9-Jan-17 3:23am

Member 11469356

Updated 9-Jan-17 4:02am

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[no name] 9-Jan-17 9:26am

Try initializing your field from the constructor.

3 solutions

Solution 2

1. If the frm variable is not a member variable, and the TreeNode call is in a separate method, then yes it is the scope. frm will have to be a member variable initialized at construction of the object.

2. With the above statement being fixed (if applicable), does the class use a public property DataGridView3 or is this the actual data grid view control? If the latter, and you did not change the access modifier to public (or protected if this class is an extension), then you will get another error. If this occurs you should read up on encapsulation and make the proper changes to be able to access that controls properties.

Encapsulation links:

Tutorials Point
C# Station
CSharp Lectures

Posted 9-Jan-17 3:59am

Ramza360

Solution 3

Instead of using a Form to hold shared data, use a static global class.

Posted 9-Jan-17 4:02am

#realJSOP

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OriginalGriff · Accepted Answer · 2017-01-09T03:50:00

You cannot use an instance variable to initialize another instance variable - because the order in which such initializations is not fixed, or even defined.

If you want to do that, do it as part of the class constructor instead of as a field initializer - that way you control the order and can guarantee that all fields are correctly initialized before they are used.

[edit]typos[/edit]