Determines whether the user input is an int integer !, Int integer

Determines whether the user input is an int integer !, Int integer

1 int age = 0; 2 string vv = this. textBox2.Text; 3 if (int. tryParse (vv, out age) 4 {5 age = int. parse (this. textBox2.Text); 6 7} 8 else 9 {10 MessageBox. show ("Age is not plastic"); 11 return; 12 13}

Int. Parse () is a type of capacity conversion. It indicates converting the numeric content string to the int type.
If the string is null, an ArgumentNullException exception is thrown;
If the string content is not a number, a FormatException is thrown;
OverflowException is thrown if the number indicated by the string content exceeds the range indicated by the int type;

Int. TryParse is similar to int. Parse, but it does not produce exceptions. If the conversion is successful, true is returned. If the conversion fails, false is returned. The last parameter is the output value. If the conversion fails, the output value is 0.

------- From lingbo hut --- Feng Chao's notes