int.TryParse,Convert.ToInt32,(int)

这几种类型在将浮点类型转换整数时是有差别

Convert.ToInt32则会进行四舍五入

int.TryParse只能转换整数,即浮点类型全部会返回0

(int)不会进行四舍五入,只取整数部分,小数点部分完全舍弃

using  System;

public   

class  DoubleToInt

{

     

public   

static   

void  Main()

    {

        Test_DoubleToInt(

0.

4 );

         Test_DoubleToInt(

0.

5 );

        Console.ReadKey();

    }

     

static   

void  Test_DoubleToInt(

double  _testNumber)

    {

         

int  _i

=

0 ;

         

for (

int  i

=

0 ;i

<

10 ;i

++)

        {

             

if (i

!=

0 ){

                _testNumber

+=

1 ;

            }

            Console.WriteLine(

string .Format(

"(int){0}={1}" ,_testNumber,(

int )(_testNumber)));

            

            Console.WriteLine(

string .Format(

"Convent.ToInt32({0})={1}" ,_testNumber,Convert.ToInt32(_testNumber)));

             

//int.TryParse只有转换整数类型，其他返回为0

             

int .TryParse(_testNumber.ToString(),  

out  _i);

            Console.WriteLine(

string .Format(

"int.TryParse({0})={1}" ,_testNumber,_i));

        }

        Console.WriteLine(

string .Empty);

    } }