C# 使用int.TryParse,Convert.ToInt32,(int)將浮點類型轉換整數時的區別

int.TryParse,Convert.ToInt32,(int)

這幾種類型在將浮點類型轉換整數時是有差別

Convert.ToInt32則會進行四舍五入

int.TryParse只能轉換整數,即浮點類型全部會返回0

(int)不會進行四舍五入,只取整數部分,小數點部分完全舍棄

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只有轉換整數類型，其他返回為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