C#检测字符串是否为正整数

方法一（字符串处理）：

public static bool IsNum(string str)
            {
bool blResult = true;//默认状态下是数字
if(str == "")
                    blResult = false;
else
                {
foreach(char Char in str)
                    {
if(!char.IsNumber(Char))
                        {
                            blResult = false;
break;
                        }
                    }
if(blResult)
                    {
if(int.Parse(str) == 0)
                            blResult = false;
                    }
                }
return blResult;
            }

方法二（正则表达式）：

static bool IsNumeric(string str)
        {
            System.Text.RegularExpressions.Regex reg1 = new System.Text.RegularExpressions.Regex(@"^[0-9]\d*$");
            return reg1.IsMatch(str);
        }