將小數舍入到最接近的0.05？

Question

嘿傢伙，我怎麼整數小數到精確到0.05分在C＃？

e.g $ 3.44，雖然還沒有想通了這一點要四捨五入至$ 3.45或$爲3.48至$ 3.50

我math.round發揮各地（）。

Answer 1

這已經被問了很多次

之前嘗試Math.Round(val*20)/20

見round 0.05

Answer 2

這裏有幾個方法，我寫了，將永遠或圓形上下爲任意值。

 public static Double RoundUpToNearest(Double passednumber, Double roundto) 
    { 

     // 105.5 up to nearest 1 = 106 
     // 105.5 up to nearest 10 = 110 
     // 105.5 up to nearest 7 = 112 
     // 105.5 up to nearest 100 = 200 
     // 105.5 up to nearest 0.2 = 105.6 
     // 105.5 up to nearest 0.3 = 105.6 

     //if no rounto then just pass original number back 
     if (roundto == 0) 
     { 
      return passednumber; 
     } 
     else 
     { 
      return Math.Ceiling(passednumber/roundto) * roundto; 
     } 
    } 
    public static Double RoundDownToNearest(Double passednumber, Double roundto) 
    { 

     // 105.5 down to nearest 1 = 105 
     // 105.5 down to nearest 10 = 100 
     // 105.5 down to nearest 7 = 105 
     // 105.5 down to nearest 100 = 100 
     // 105.5 down to nearest 0.2 = 105.4 
     // 105.5 down to nearest 0.3 = 105.3 

     //if no rounto then just pass original number back 
     if (roundto == 0) 
     { 
      return passednumber; 
     } 
     else 
     { 
      return Math.Floor(passednumber/roundto) * roundto; 
     } 
    } 

Answer 3

這個片段只是一輪上漲到最近的0.05

public static decimal Round(decimal value) { 
     var ceiling = Math.Ceiling(value * 20); 
     if (ceiling == 0) { 
      return 0; 
     } 
     return ceiling/20; 
    }