判斷字串是否為全數字

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 namespace test
 7 {
 8     class Program
 9     {
10         // 檢查字串是否全為數字
11 
12         public bool IsNum(string Str)
13         {
14             bool blResult = true;
15             if (Str == "")
16                 blResult = false;
17             else
18             {
19                 foreach (char Char in Str)
20                 {
21                     if (!Char.IsNumber(Char))
22                     {
23                         blResult = false;
24                         break;
25                     }
26                 }
27                 if (blResult)
28                     if (int.Parse(Str) == 0)
29                         blResult = false;
30             }
31             return blResult;
32         }
33 
34       static void Main(string[] args)
35         {
36             Program p = new Program();
37             Console.WriteLine("請輸入字串");
38             string s = Console.ReadLine();
39             if (p.IsNum(s))
40             {
41                 Console.WriteLine("全為數字");
42             }
43             else
44             {
45                 Console.WriteLine("不是全為數字");
46             }
47             Console.ReadLine();
48 
49         }
50     }
51 }