App_Code/StringHelper.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Security.Cryptography;
using System.IO;
using System.Configuration;
using System.Drawing;

/// <summary>
/// Summary description for StringHelper
/// </summary>
public class StringHelper
{
    public static string convertStr(string text)
    {
        if (text == null)
        {
            text = "";
        }
        return text.Trim();
    }

    /// <summary>
    /// 处理长度值
    /// </summary>
    /// <param name="text"></param>
    /// <returns></returns>
    public static string subStr(int length, string text)
    {
        if (text.Length >= length)
        {
            text = text.Substring(0, length) + " ...";
        }
        return text;
    }

    /// Method to make sure that user's inputs are not malicious
    /// </summary>
    /// <param name="text">User's Input</param>
    /// <param name="maxLength">Maximum length of input</param>
    /// <returns>The cleaned up version of the input</returns>
    public static string InputText(string text, int maxLength)
    {
        text = text.Trim();
        if (string.IsNullOrEmpty(text))
            return string.Empty;
        if (text.Length > maxLength)
            text = text.Substring(0, maxLength);
        text = Regex.Replace(text, "[\\s]{2,}", " ");	//two or more spaces
        text = Regex.Replace(text, "(<[b|B][r|R]/*>)+|(<[p|P](.|\\n)*?>)", "\n");	//<br>
        text = Regex.Replace(text, "(\\s*&[n|N][b|B][s|S][p|P];\\s*)+", " ");	//&nbsp;
        text = Regex.Replace(text, "<(.|\\n)*?>", string.Empty);	//any other tags
        text = text.Replace("'", "''");
        return text;
    }

    /// <summary> 
    ///SQL注入过滤