Int. parse (), Int. tryparse (), convert. toint32 (), (INT)

 

int I =-1; Int. tryparse (null, out I); after execution, I equals 0 instead of-1. Remember. 1 (INT) is a type conversion. When we convert the NT type to the long, float, double, decimal type, we can use implicit conversion, however, Explicit conversions are required from the long type to the int type. Otherwise, a compilation error occurs. 2 Int. parse () is a type-tolerant 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. If the value of the string content exceeds the range that the int type can represent, an overflowexception exception is thrown; Int. tryparse and Int. parse is similar, but it does not produce exceptions. If the conversion is successful, true is returned, and if the conversion fails, false is returned. The last parameter is the output value. If the conversion fails, the output value is 0 4 convert. toint32 () is a type-tolerant conversion, but it is not limited to converting a string to the int type, it can also be another type of parameter; comparison: convert. if toint32 is null, 0; int is returned. if the parse parameter is null, an exception is thrown. If the convert. toint32 parameter is "", an exception is thrown. If the Int. parse parameter is "", an exception is thrown. Convert. toint32 can be converted to many types; Int. parse can only be converted to numeric strings