Object reference not defined for an object instance. in an object declaration

Question

There is an error in my code only when I publish, when debugging works normally. the error is as follows: "Undefined object reference for an object instance." my code:

MkfFile file = new MkfFile();

public class MkfFile
{
    private List<FileData> _files { get; set; }
    private List<string> errors { get; set; }
    public MkfFile()
    {
        this._files = new List<FileData>();
        this.errors = new List<string>();
    }
    private class FileData
    {
    }
}

If I comment on the line "Mkffile file = new Mkffile();" it works normally, someone can tell me where the mistake is?

Answer 1

You cannot declare a variable outside the class! It has to be contextualized in some object. That’s why when you comment on the line, it works fine, because there are no variables declared loose in the file outside the class.

I understand you want to declare it global:

public class MkfFile
{
    private List<FileData> _files { get; set; }
    private List<string> errors { get; set; }
    MkfFile file = new MkfFile();

    public MkfFile()
    {
        this._files = new List<FileData>();
        this.errors = new List<string>();
    }
    private class FileData
    {
    }
}