Ternary Statement Inline If Not Compiling

Question

I am trying to run this inline if statement

pRun.StartInfo.FileName = File.Exists("C:\\Test\\Data\\TestingPurposes\\" + UserName 
+ "DailyInfo") ? pRun.StartInfo.UseShellExecute = true : MessageBox.Show("Please 
verify that this file exists");

But I am getting a compile error of:

Type of conditional expression cannot be determined because there is no implicit conversion between 'bool' and 'System.Windows.Forms.DialogResult'

How can I remove this error and run the below statement? What I want to do is check if the file exists, if it does, open it. If it does not then produce the messagebox with said message.

Answer 1

In order to use ternary operator, both statement should return the same type or one type should be convertible to other.See documentation:

Either the type of first_expression and second_expression must be the same, or an implicit conversion must exist from one type to the other.

You need to use simple if statements intead, it is also more readable:

if(File.Exists("C:\\Test\\Data\\TestingPurposes\\" + UserName + "DailyInfo"))
{ 
   pRun.StartInfo.UseShellExecute = true   
}
else MessageBox.Show("Please verify that this file exists");