字符串尾号数字自增长

 1  private void btnCalc_Click(object sender, EventArgs e)
 2         {
 3             string input = txtStr.Text.Trim();
 4             int addxs = Convert.ToInt32(txtXS.Text.Trim());
 5 
 6             //数字的字符索引
 7             int strartNo = 0;
 8             //固定字符部分
 9             string gdzf = string.Empty;
10             //可变列字符部分
11             string kbsz = string.Empty;
12 
13             for (int i = 0; i < input.Length; i++)
14             {
15                 //判断是否为数字类型
16                 if (58 > input[i] && input[i] > 47)
17                 {
18                     strartNo = i;
19                     break;
20                 }
21             }
22 
23             //固定列赋值
24             gdzf = input.Substring(0, strartNo);
25             //可变列赋值
26             kbsz = input.Substring(strartNo, input.Length - strartNo);
27 
28             //可变列长度
29             int kbcd = kbsz.Length;
30 
31             int chsz = 0;
32             try
33             {
34                 chsz = Convert.ToInt32(kbsz);
35             }
36             catch (Exception)
37             {
38                 txtResult.Text = "格式错误";
39             }
40 
41             chsz = chsz + addxs;
42 
43             //比较原有数字字符长度与自增后的字符长度
44             if (chsz.ToString().Length < kbcd)
45             {
46                 //补零个数
47                 int blgs = kbcd - chsz.ToString().Length;
48                 string zero = string.Empty;
49                 for (int i = 0; i < blgs; i++)
50                 {
51                     zero = zero + "0";
52                 }
53 
54                 kbsz = zero + chsz;
55             }
56             else
57             {
58                 kbsz = chsz.ToString();
59             }
60 
61             txtResult.Text = gdzf + kbsz;
62         }