c# - 在 C# 中执行 ParseInt 时输入字符串的格式不正确

Question

我正在尝试在 C# 中执行 Parse int，但在 int mFrom = int.Parse(fromTo.Substring(1, fromTo.IndexOf("C"))); 行中出现异常像下面一样

"System.FormatException: Input string was not in a correct format.

代码如下:

using System;
using System.Linq;
using System.Linq.Expressions;
using System.Text.RegularExpressions;
 class Program
   {
    static void Main()
     {
       string fromTo= "M5000C001";
       int mFrom = int.Parse(fromTo.Substring(1, fromTo.IndexOf("C")));
       int cFrom = int.Parse(fromTo.Substring(fromTo.LastIndexOf("C") + 1));
       Console.WriteLine("FromTo" + mFrom);
     }
}

Answer 1

试试这个:

IndexOf 将返回您所请求的字 rune 字的索引。

string fromTo= "M5000C001";
int mFrom = int.Parse(fromTo.Substring(1, fromTo.IndexOf("C") - 1));
int cFrom = int.Parse(fromTo.Substring(fromTo.LastIndexOf("C") + 1));
Console.WriteLine("FromTo" + mFrom);

引用这个documentation .