一、 /// <summary>
/// 删除字符串中的中文
/// </summary>
public static string Delete(string str)
{
string retValue = str;
if (System.Text.RegularExpressions.Regex.IsMatch(str, @"[\u4e00-\u9fa5]"))
{
retValue = string.Empty;
var strsStrings = str.ToCharArray();
; index < strsStrings.Length; index++)
{
if (strsStrings[index] >= 0x4e00 && strsStrings[index] <= 0x9fa5)
{
continue;
}
retValue += strsStrings[index];
}
}
return retValue;
}
二、
/// <summary>
/// 判断字符串是否是数字,只针对Int类型，double不行
/// </summary>
public static bool IsNumber(string s)
{
if (string.IsNullOrWhiteSpace(s)) return false;
const string pattern = "^[0-9]*$";
Regex rx = new Regex(pattern);
return rx.IsMatch(s);
}
/// <summary>
/// 判断字符串是否是 int或double，为int或double时返回true///可用于界面上经纬度值判定
/// </summary>
public static bool IsIntOrDouble(string strNumber)
{
Regex objNotNumberPattern = new Regex("[^0-9.-]");
Regex objTwoDotPattern = new Regex("[0-9]*[.][0-9]*[.][0-9]*");
Regex objTwoMinusPattern = new Regex("[0-9]*[-][0-9]*[-][0-9]*");
const string strValidRealPattern = "^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+$";
const string strValidIntegerPattern = "^([-]|[0-9])[0-9]*$";
Regex objNumberPattern = new Regex("(" + strValidRealPattern + ")|(" + strValidIntegerPattern + ")");
return !objNotNumberPattern.IsMatch(strNumber) &&
!objTwoDotPattern.IsMatch(strNumber) &&
!objTwoMinusPattern.IsMatch(strNumber) &&
objNumberPattern.IsMatch(strNumber);
}
C#怎么判断字符是不是汉字
三、数字前补0
int number = 001;
var aa = "";
if (number > 1000)
{
aa = number.ToString();
}
else
{
aa = number.ToString().PadLeft(4, '0'); // 一共4位,位数不够时从左边开始用0补
}