CODEWITHSUNDEEP
c#mvvm
GJPD
GJPD

Reputation: 89

How to rectify the error Operator '&&' cannot be applied to operands of type 'bool?' and 'bool'

This is my c# code.I'm getting error in this particular line as Operator '&&' cannot be applied to operands of type 'bool?' and 'bool' 

if (openFileDialog.ShowDialog() && viewModel.OpenFileCommand.CanExecute(openFileDialog.FileName))
                {
                    viewModel.OpenFileCommand.Execute(openFileDialog.FileName);
                }

Please help me to rectify this error.

Upvotes: 2

Views: 1461

Answers (2)

TheGeneral
TheGeneral

Reputation: 81543

Window.ShowDialog Method

Returns Nullable<Boolean> A Nullable value of type Boolean that specifies whether the activity was accepted (true) or canceled (false). The return value is the value of the DialogResult property before a window closes.

The problem is the result from ShowDialog is nullable.

However, you can rectify this by just using the more verbose == true, the compiler then understands you want to explicitly know it's true, and not null or false. Don't ask me why it doesn't like the shorthand version (I'd have to dig through the specs).

Either way, here is your solution:

if (openFileDialog.ShowDialog() == true && viewModel....)

Upvotes: 4

ojlovecd
ojlovecd

Reputation: 4902

if (openFileDialog.ShowDialog() ?? false && viewModel.OpenFileCommand.CanExecute(openFileDialog.FileName))

Upvotes: 0

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