这个function主要是用来format传入的浮点型的字符串。
strFloat：传入的浮点型字符串；
minDecimals: 最小保留小数位；
例如：
传入 strFloat = "0.1"; minDecimal = 2
则返回的结果为：0.10
传入 strFloat = "0.123"; minDecimal = 2
则返回的结果为：0.123
传入 strFloat = ".1"; minDecimal = 2
则返回的结果为：0.10
传入 strFloat = "0001.10000"; minDecimal = 2
则返回的结果为：1.10
等等情况……
Code
/// <summary>
/// Formats a numeric string to have a minimum number of decimals by adding or removing leading/trailing zeros. Example: .1 or 01.100 to 0.10
/// </summary>
public static string FormatMinDecimals(string strFloat, int minDecimals)
{
//This is a recursive function and order of operations is important
//No formatting on Null or Empty input
if(strFloat == String.Empty)
return strFloat;
//find the current position of the decimal point
int at = strFloat.LastIndexOf(".");
//if no decimal point, append decimal point and min zeros and return
if(at < 0)
if(minDecimals > 0)
return strFloat + ".".PadRight(1 + minDecimals, '0');
else
return strFloat;
//add a zero to the left of decimal point if no int value
else if(at == 0)
return FormatMinDecimals("0" + strFloat, minDecimals);
//if no minimum, and decimal point is the last character, remove it
else if(at == strFloat.Length - 1 && minDecimals == 0)
return FormatMinDecimals(Left(strFloat, strFloat.Length - 1), minDecimals);
//remove leading zeros if more than one
else if(at > 1 && Left(strFloat, 1) == "0")
return FormatMinDecimals(Right(strFloat, strFloat.Length - 1), minDecimals);
//append one zero "while" has less than min decimal places
else if(at >= strFloat.Length - minDecimals)
return FormatMinDecimals(strFloat + "0", minDecimals);
//return if it has minimum decimal places or has more but with no trailing zeros
else if(at == strFloat.Length - minDecimals - 1 || Right(strFloat, 1) != "0")
return strFloat;
//remove trailing zeros
else
return FormatMinDecimals(Left(strFloat, strFloat.Length - 1), minDecimals);
}