Used to always use Int. Parse (x) or Convert.toint64 (x), later found in the project that if the value of the x variable is null, it will be an error, even if I write int. Parse (x=x?? ") 0 ") means:" If x is empty, give X a value of ' 0 ' string,
Take the int type as an example, specifying Convert.ToInt32 (object value), int. Parse (object value) and int. TryParse (string s,out int result) usageI. Int.parseInt. The underlying implementation principle of parse (can be ignored directly,
int i =-1;BOOL B = Int. TryParse (null, out i);When execution is complete, b equals false,i equals 0, not equal to-1, remember.int i =-1;BOOL B = Int. TryParse ("123", out I);After execution, b equals true,i equals 123;1, (int) is a type conversion;
Int. tryparse, convert. toint32, (INT)These types differ in convert when converting the floating point type to an integer. toint32 is rounded to int. tryparse can only be converted to integers, that is, if the floating point type is all, 0 (INT) is
Source:http://www.cnblogs.com/fishtreeyu/archive/2011/01/15/1936193.html int i =-1;BOOL B = Int. TryParse (null, out i);When execution is complete, b equals false,i equals 0, not equal to-1, remember.int i =-1;BOOL B = Int. TryParse ("123", out
Int I =-1;Bool B = int. tryparse (null, out I );After the execution is complete, B is equal to false, I is equal to 0, rather than-1. Remember.
Int I =-1;Bool B = int. tryparse ("123", out I );
After the execution is completed, B is equal to true,
In C #, what are the differences between (INT), int32.parse (), convert. toint32 (), and int32.tryparse?
The Int keyword indicates an integer that is 32-bit. Its. NET Framework type is system. int32.If int32.tryparse () does not throw an exception,
Int32.parse (), convert. toint32 (), int32.tryparse ()The int keyword indicates an integer that is 32-bit. Its. net framework type is system. int32.If int32.tryparse () does not throw an exception, true or false is returned to indicate whether the
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,
One, (int) variable name [coercion type conversion]:This conversion is primarily used for numeric type conversions, from int to long,float,double,decimal types, and implicit conversions are possible, but the use of a long type to an int type
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