Int. Parse (), Int. The difference between TryParse () and Convert.ToInt32 ()

1:Int. Parse (one parameter)

This parameter must satisfy:

1 can only be a string;

2 can only be an "integer" string, which is the form after various integer tostring () , and cannot be a floating-point type.

2:Int. TryParse (parameter A, parameter b);

This method can be considered an int. The Parse () method upgrades, that is, an exception handler, returns False if an exception occurs, and returns the output parameter to 0;

Note that parameter A, also must be a string or null to

For example:

int b;
Int. TryParse ("54.1", out B);
Response.Write (b);

The result is: 0

int b;
Int. TryParse (Null,out b);
Response.Write (b);

The result is: 0

int b=12;
Int. TryParse ("Fdfds", out B);
Response.Write (b);

The result is: 0

int b=12;
Int. TryParse ("123456", out B);
Response.Write (b);

The result is: 123456, not 12

3:convert.toint32 (one parameter)

This parameter can be a variety of types, but this string type "DFADF", "123.1" will error

int b= convert.toint32 (null);
Response.Write (b);

Results: 0

bool A = false;
int b= Convert.ToInt32 (a);
Response.Write (b);

Results: 0

int b= Convert.ToInt32 (1253.1);
Response.Write (b);

Results: 1253

int b= Convert.ToInt32 (1253.5);
Response.Write (b);

Results: 1254

Int. Parse (), Int. The difference between TryParse () and Convert.ToInt32 ()