C# WPF check if checkbox is checked error [duplicate]

问题

This question already has answers here:

cannot implicitly convert type 'bool?' to 'bool'. An explicit conversion exists (are you missing a cast?) (7 answers)

Closed last year.

When I do:

if (checkbox1.IsChecked)

I get the error:

Cannot implicitly convert type 'bool?' to 'bool'.

When I do:

if (checkbox1.Checked)

I get the error:

"The event 'System.Windows.Controls.Primitives.ToggleButton.Checked' can only appear on the left hand side of += or -=".

Any ideas what I'm doing wrong?

回答1:

IsChecked is a nullable boolean, which means it can have three states. Nullable types are denoted by the ? you see in the error.

Try this:

if ((bool)checkbox1.IsChecked == true)

来源：https://stackoverflow.com/questions/35162245/c-sharp-wpf-check-if-checkbox-is-checked-error