C# 使用int.TryParse,Convert.ToInt32,(int)将浮点类型转换整数时的区别

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);
    } }

 

 

 

http://www.cnblogs.com/Dely/p/3791951.html

http://stackoverflow.com/questions/11431793/convert-toint32-rounds-to-the-nearest-even-number

http://stackoverflow.com/questions/311696/why-does-net-use-bankers-rounding-as-defaul