1/**//// <summary>
 2        /// 截取字符串，不限制字符串长度
 3        /// </summary>
 4        /// <param name="str">待截取的字符串</param>
 5        /// <param name="len">每行的长度，多于这个长度自动换行</param>
 6        /// <returns></returns>
 7        public string CutStr(string str,int len)
 8        {    string s="";
 9           
10            for(int i=0;i<str.Length ;i++)
11            {
12                int r= i% len;
13                int last =(str.Length/len)*len;
14                if (i!=0 && i<=last)
15                {
16                   
17                    if( r==0)
18                    {
19                        s+=str.Substring(i-len,len)+"<br>";
20                    }
21                       
22                }
23                else if (i>last)
24                {
25                    s+=str.Substring(i-1) ;
26                    break;
27                }
28               
29 &nb