Question

如何在C＃中删除负数上的引号零？

例如，我希望'-01'转换为'-1'。

Answer 1

假设您的输入是实际字符串，那么您可以使用任何常见的整数解析方法，如Int32.Parse()或Convert.ToInt32()应该处理前导零：

Convert.ToInt32("-01"); // yields -1

幕后花絮

如果你挖掘into the implementation of these methods，你会发现这会调用一个基础的StringToNumber()方法和随后的ParseNumber() method，它应该处理前导零和尾随零：

// This is called via the following methods
// 1.) Convert.ToInt32()
// 2.) Int32.Parse()
// 3.) Number.ParseInt32()
// 4.) StringToNumber() (this method)
// 5.) ParseNumber() (called by this method)
[System.Security.SecuritySafeCritical]  // auto-generated
private unsafe static void StringToNumber(String str, NumberStyles options, ref NumberBuffer number, NumberFormatInfo info, Boolean parseDecimal) {

        if (str == null) {
            throw new ArgumentNullException("String");
        }
        Contract.EndContractBlock();
        Contract.Assert(info != null, "");
        fixed (char* stringPointer = str) {
            char * p = stringPointer;
            if (!ParseNumber(ref p, options, ref number, null, info , parseDecimal) 
                || (p - stringPointer < str.Length && !TrailingZeros(str, (int)(p - stringPointer)))) {
                throw new FormatException(Environment.GetResourceString("Format_InvalidString"));
            }
        }
}

private static Boolean TrailingZeros(String s, Int32 index) {
        // For compatability, we need to allow trailing zeros at the end of a number string
        for (int i = index; i < s.Length; i++) {
            if (s[i] != '\0') {
                return false;
            }
        }
        return true;
}

Answer 2

您可以尝试解析string：

var negativeStrNum = "-000005";

Console.WriteLine(int.Parse(negativeStrNum));

这会给你-5

Answer 3

int.Parse("-01").ToString()怎么样？

Answer 4

        string InputString = "-020.50";
        for (int i = 0; i < InputString.Length; i++)
        {
            char CurrentCharacter = InputString[i];

            if (Char.IsDigit(CurrentCharacter))
            {
                if (CurrentCharacter == '0')
                {
                    InputString = InputString.Remove(i, 1);
                    i--;
                }
                else
                    break;
            }
        }
        Console.WriteLine(InputString);

C＃为负数的前导零

4 个答案: