NullReferenceException when trying to set class property

Question

Basically I have 2 classes, \"Manifest\" and \"BrowserAction\", set out like this:

public class BrowserAction
{
    public string default_icon {get; set;}
    pu         


        

Answer 1

You are accessing property browser_action of newly created instance newManifest that is still null.

Change your example to something like:

public void setManifest()
{
    Manifest newManifest = new Manifest();
    newManifest.browser_action = new BrowserAction();
    newManifest.browser_action.default_popup = "popup.html";
}

I am assuming that BrowserAction has a public accessible constructor with no arguments.

Or in one go:

public void setManifest()
{
    Manifest newManifest = new Manifest()
        {
            browser_action = new BrowserAction()
                {
                    default_popup = "popup.html"
                }
        };
}