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string aa="abcde";
aa=aa.PadingRight(8,' ');
List<string> list=new List<string>
list.Add(aa.subString(0,3));
list.Add(aa.subString(4,5)); //取从第四个到第8个
string str = "12345";
string str1 = "";
string str2 = "";
int max = 8;
do
{
if (str.Length < 8)
{
str += "_";
}
} while (str.Length < 8);
str1 = str.Substring(0, 3);
str2 = str.Substring(3, str.Length - 3);