If I write this:

private string boundText;

public String BoundText
{
    get { return boundText; }
    set
    {
        boundText = value;
        OnPropretyChanged("BoundText");
    }
}

I get this warning:

Warning CS8618 Non-nullable field 'boundText' must contain a non-null value when exiting the constructor. Consider declaring the field as nullable.

And if I write this:

private string boundText;

public String BoundText
{
    get { return boundText; }
    set
    {
        boundText = value;
        OnPropretyChanged("BoundText");
    }
}  = string.Empty;

I get this error :

Error CS8050 Only automatically implemented properties can have initializers.

If I write this:

private string boundText;

public String BoundText
{
    get { return boundText; }
    set
    {
        boundText = value;
        OnPropretyChanged("BoundText");
    }
}

I get this warning:

Warning CS8618 Non-nullable field 'boundText' must contain a non-null value when exiting the constructor. Consider declaring the field as nullable.

And if I write this:

private string boundText;

public String BoundText
{
    get { return boundText; }
    set
    {
        boundText = value;
        OnPropretyChanged("BoundText");
    }
}  = string.Empty;

I get this error :

Error CS8050 Only automatically implemented properties can have initializers.

• c#
• non-nullable

• 1 what is boundText? – MakePeaceGreatAgain Commented Mar 13 at 14:43
• empty and null is not the same – LMA Commented Mar 13 at 14:45
• 1 private string boundText = string.Empty; - here is where you assign the default value. – Clemens Commented Mar 13 at 14:45
• @Clemens thats a dirty wrap around since you deny any nullhandling for the future – LMA Commented Mar 13 at 14:48
• 1 private string? boundText; - This is the proper way to handle it for future null handling – Charles Henington Commented Mar 14 at 6:54

1 Answer 1

You need to assign boundText (not BoundText) a default value.

Should be something like that

private string boundText = string.Empty;
public string BoundText
{
    get => boundText;
    set
    {
        boundText = value;
        OnPropertyChanged(nameof(BoundText));
    }
}

It doesn't really address the issue but i also advice you to use nameof instead of hardcoding string value