/// <summary>
/// Return count of decimals after decimal-place
/// </summary>
private int getDecimalCount(double val)
{
int count = 0;
...
return count;
}
参数’val’是(此方法的正常值的样本)
5900.00返回2
5900.09返回2
5900.000返回3
5900.001返回3
1.0返回1
0.0000005返回7
1.0000000返回7
5900822返回0
我的问题是计算.0 .00 .000等等
题：
我该如何解决这个问题？如果这种方法不可能与双打,怎么回事？
[EDITED]
– 进行小的文本更改以提出更明确的问题,
– 由于’小数位’的错误使用含义导致的语言更正
解决方法
与@Miguel类似,这是我将如何处理它：
public static int getDecimalCount(double dVal,string sVal,string culture)
{
CultureInfo info = CultureInfo.GetCultureInfo(culture);
//Get the double value of the string representation,keeping culture in mind
double test = Convert.ToDouble(sVal,info);
//Get the decimal separator the specified culture
char[] sep = info.NumberFormat.NumberDecimalSeparator.tocharArray();
//Check to see if the culture-adjusted string is equal to the double
if (dVal != test)
{
//The string conversion isn't correct,so throw an exception
throw new System.ArgumentException("dVal doesn't equal sVal for the specified culture");
}
//Split the string on the separator
string[] segments = sVal.Split(sep);
switch (segments.Length)
{
//Only one segment,so there was not fractional value - return 0
case 1:
return 0;
//Two segments,so return the length of the second segment
case 2:
return segments[1].Length;
//More than two segments means it's invalid,so throw an exception
default:
throw new Exception("Something bad happened!");
}
}
美国英语的快捷方法：
public static int getDecimalCount(double dVal,string sVal)
{
return getDecimalCount(dVal,sVal,"en-US");
}
测试：
static void Main(string[] args)
{
int i = 0;
double d = 5900.00;
string s = "5900.00";
Console.WriteLine("Testing with dVal = {0} and sVal = {1}.",d,s);
i = getDecimalCount(d,s);
Console.WriteLine("Expected output: 2. Actual output: {0}",i);
Console.WriteLine();
d = 5900.09;
s = "5900.09";
Console.WriteLine("Testing with dVal = {0} and sVal = {1}.",i);
Console.WriteLine();
d = 5900.000;
s = "5900.000";
Console.WriteLine("Testing with dVal = {0} and sVal = {1}.",s);
Console.WriteLine("Expected output: 3. Actual output: {0}",i);
Console.WriteLine();
d = 5900.001;
s = "5900.001";
Console.WriteLine("Testing with dVal = {0} and sVal = {1}.",i);
Console.WriteLine();
d = 1.0;
s = "1.0";
Console.WriteLine("Testing with dVal = {0} and sVal = {1}.",s);
Console.WriteLine("Expected output: 1. Actual output: {0}",i);
Console.WriteLine();
d = 0.0000005;
s = "0.0000005";
Console.WriteLine("Testing with dVal = {0} and sVal = {1}.",s);
Console.WriteLine("Expected output: 7. Actual output: {0}",i);
Console.WriteLine();
d = 1.0000000;
s = "1.0000000";
Console.WriteLine("Testing with dVal = {0} and sVal = {1}.",i);
Console.WriteLine();
d = 5900822;
s = "5900822";
Console.WriteLine("Testing with dVal = {0} and sVal = {1}.",s);
Console.WriteLine("Expected output: 0. Actual output: {0}",i);
Console.ReadLine();
}
最后,测试的输出：
Testing with dVal = 5900 and sVal = 5900.00.
Expected output: 2. Actual output: 2Testing with dVal = 5900.09 and sVal = 5900.09.
Expected output: 2. Actual output: 2Testing with dVal = 5900 and sVal = 5900.000.
Expected output: 3. Actual output: 3Testing with dVal = 5900.001 and sVal = 5900.001.
Expected output: 3. Actual output: 3Testing with dVal = 1 and sVal = 1.0.
Expected output: 1. Actual output: 1Testing with dVal = 5E-07 and sVal = 0.0000005.
Expected output: 7. Actual output: 7Testing with dVal = 1 and sVal = 1.0000000.
Expected output: 7. Actual output: 7Testing with dVal = 5900822 and sVal = 5900822.
Expected output: 0. Actual output: 0
如果您对此有疑问或者没有意义,请告诉我.
