c# – 将字符串转换为时间并再次返回

我建立了一个测试,看看它是如何工作的,

<%
    TimeSpan tspan;
    TimeSpan tspan2;   

     string TimeString;
     string TimeString2;
     string Converted;
     double ConvTime;
     for (int HH = 0; HH < 24; HH++)
     {
         for (int M1 = 0; M1 < 6; M1++)
         {
             for (int M2 = 0; M2 < 10; M2++)
             {
                 TimeString = HH.ToString() + ":" + M1.ToString() + M2.ToString();

                 // Convert Time String to Fractional Hours 
                 tspan = TimeSpan.Parse(TimeString);
                 ConvTime = Convert.ToDouble(tspan.TotalHours);
                 Converted = String.Format("{0:00.000}",ConvTime);

                 // Convert Fractional Hour String to Time String
                 tspan2 = TimeSpan.FromHours(Convert.ToDouble(Converted));
                 TimeString2 = string.Format("{0:D1}:{1:D2}",tspan2.Hours,tspan2.Minutes);


                 Response.Write(TimeString + " = ");
                 Response.Write(Converted + " = ");
                 Response.Write(TimeString2 + "<br>");
             }
         }
     }     
%>

我遇到的问题是,当我转换为字符串时,我会从转换中释放余数,这会在转换回来时抛出该值.

这是前10秒的输出.

0:00 = 00.000 = 0:00
0:01 = 00.017 = 0:01
0:02 = 00.033 = 0:01
0:03 = 00.050 = 0:03
0:04 = 00.067 = 0:04
0:05 = 00.083 = 0:04
0:06 = 00.100 = 0:06
0:07 = 00.117 = 0:07
0:08 = 00.133 = 0:07
0:09 = 00.150 = 0:09
0:10 = 00.167 = 0:10

你可以看到我开始的并不总是我最终的结果.

如何正确地将时间值字符串“HH：MM”转换为小数字符串“00.000”并再次正确返回.

谢谢

编辑：

我试过这个,

TimeString = "02:02";
 Converted = TimeSpan.Parse(TimeString).TotalHours.ToString("00.000");

 tspan2 = TimeSpan.FromHours(Convert.ToDouble(Converted));
 TimeString2 = string.Format("{0:D1}:{1:D2}",tspan2.Minutes);

但我得到Converted =“02.033”和TimeString2 =“2:01”.它应该等于“2:02”.当我强迫它“00.000”时,我想我正在失去剩下的余数.