1﹑使用Try...Catch
private static bool IsNumeric(string itemValue,int intFLag) { try { int i = Convert.ToInt32(itemValue); return true; } catch { return false; } }
2﹑使用正则表达式
using System.Text.RegularExpressions; private static bool IsNumeric(string itemValue) { return (IsRegEx("^(-?[0-9]*[.]*[0-9]{0,3})$", itemValue)); } private static bool IsRegEx(string regExValue, string itemValue) { try { Regex regex = new System.Text.RegularExpressions.Regex(regExValue); if (regex.IsMatch(itemValue)) return true; else return false; } catch (Exception ) { return false; } finally { } }
3﹑判断输入的keyCode
public static bool IsNumeric(System.Windows.Forms.KeyPressEventArgs e) { if ((e.KeyChar >= (char)48 && e.KeyChar<=(char)57) || e.KeyChar ==(char)8 || e.KeyChar ==(char)45 || e.KeyChar ==(char)47) { } else { e.Handled=true; } return true; } public static bool isNumeric(string strInput) { char[] ca = strInput.ToCharArray(); bool found = true; for (int i = 0; i < ca.Length; i++) { if ((ca[i] < '0' || ca[i] > '9') && ca[i] != '.') { found = false; break; }; }; return found; }