You can use the conditional operator (?:)
[DebuggerDisplay("{GetType().Name,nq}: FileName = {FileName,nq}{IsTempFile ? \", TempFileName: \" + TempFileName : System.String.Empty,nq}")]
IsTempFile == false

IsTempFile == true

You can use the conditional operator (?:)
[DebuggerDisplay("{GetType().Name,nq}: FileName = {FileName,nq}{IsTempFile ? \", TempFileName: \" + TempFileName : System.String.Empty,nq}")]
IsTempFile == false

IsTempFile == true
