/** 扩展NameValueCollection* 调用方法：Request.QueryString.IsNumeric("ID")
*/using System;
using System.Collections.Specialized;
using System.Text.RegularExpressions;namespace App
{/// <summary>/// 扩展 System.Collections.Specialized.NameValueCollection/// </summary>public static class NameValueCollectionExtensions{/// <summary>/// 使用正表达式来验证指定值/// </summary>public static bool IsMatch(this NameValueCollection nv, string key, string pattern){return Regex.IsMatch(nv[key] ?? "", pattern, RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);}/// <summary>/// 检查指定值是否为数字/// </summary>public static bool IsNumeric(this NameValueCollection nv, string key){return Regex.IsMatch(nv[key] ?? "", @"^\d{1,}$");}/// <summary>/// 以string类型返回指定值，如值非纯数字则返回空字符串/// </summary>public static string ToNumeric(this NameValueCollection nv, string key){return nv.IsNumeric(key) ? nv[key].Trim() : "";}/// <summary>/// 以int类型返回指定值/// </summary>public static int ToInt(this NameValueCollection nv, string key){int val = 0;int.TryParse(nv[key], out val);return val;}/// <summary>/// 以long类型返回指定值/// </summary>public static long ToLong(this NameValueCollection nv, string key){long val = 0;long.TryParse(nv[key], out val);return val;}/// <summary>/// 以short类型返回指定值/// </summary>public static short ToShort(this NameValueCollection nv, string key){short val = 0;short.TryParse(nv[key], out val);return val;}/// <summary>/// 以byte类型返回指定值/// </summary>public static byte ToByte(this NameValueCollection nv, string key){byte val = 0;byte.TryParse(nv[key], out val);return val;}/// <summary>/// 返回安全的SQL字符串/// </summary>public static string ToVarchar(this NameValueCollection nv, string key){//string val = nv[key] ?? "";//val = val.Replace("'", "''");return (nv[key] ?? "").Replace("'", "''");}/// <summary>/// 以bool类型返回指定值/// </summary>public static bool ToBoolean(this NameValueCollection nv, string key){bool val = false;bool.TryParse(nv[key], out val);return val;}/// <summary>/// 检查指定值是否为DateTime类型/// </summary>public static bool IsDateTime(this NameValueCollection nv, string key){DateTime date;return (DateTime.TryParse(nv[key], out date));}/// <summary>/// 以DateTime返回指定值，如指定值为非法日期则返回当前时间/// </summary>public static DateTime ToDateTimeOrNow(this NameValueCollection nv, string key){DateTime date = DateTime.Now;DateTime.TryParse(nv[key], out date);return date;}/// <summary>/// 以DateTime返回指定值，如指定值为非法日期则返回null/// </summary>public static DateTime? ToDateTimeOrNull(this NameValueCollection nv, string key){DateTime date;if (DateTime.TryParse(nv[key], out date))return date;elsereturn null;}}
}

还是这个界面比较清爽，呵呵……