stringoperator.cs

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 using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Net;
using System.Text;
using System.IO;
using System.Collections;



/// <summary>
/// stringoperator 的摘要说明
/// </summary>
public class stringoperator
{
	public stringoperator()
	{
		//
		// TODO: 在此处添加构造函数逻辑
		//
    }
    #region 取子串
    /// <summary>
    /// 从一串字符串中取得指定长定的字符串
    /// </summary>
    /// <param name="sString"></param>
    /// <param name="nLang"></param>
    /// <returns></returns>
    public string SubStr(string sString, int nLang)
    {
        if (sString.Length <= nLang)
       
        {
            return sString;
        }

        int nStrLeng = nLang - 1;
        string sNewStr = sString.Substring(0, nStrLeng);
        sNewStr = sNewStr + "....";
        return sNewStr;
    }

    #endregion
    #region
    /// <summary>
    /// 查询条件组合
    /// </summary>
    /// <param name="queryitems"></param>
    /// <returns></returns>
    public string GetConditionClause(Hashtable queryitems)
    {
        int count = 0;
        string where = "";
        foreach (DictionaryEntry item in queryitems)
        {
            if (count == 0)
            {
                where = " where ";
            }
            else
            {
                where += " and ";
            }
            if (item.Value.GetType().ToString()=="System.String"||item.Value.GetType().ToString()=="System.DataTime")
            {
                where += item.Key.ToString() + " like '%" + item.Value.ToString() + "%'";
            }
            else
            {
                where += item.Key.ToString() + "=" + item.Value.ToString();
            }
            count++;
        }
        return where;
    }
#endregion
        #region
    /// <summary>
    /// 查询条件组合
    /// </summary>
    /// <param name="queryitems"></param>
    /// <returns></returns>
    public string GetConditionClause(Hashtable queryitems,bool yes)
    {
        int count = 0;
        string where = "";
        foreach (DictionaryEntry item in queryitems)
        {
            if (count == 0)
            {
                where = " where ";
            }
            else
            {
                where += " and ";
            }
            if (item.Value.GetType().ToString()=="System.String"||item.Value.GetType().ToString()=="System.DataTime")
            {
                if (yes)
                {
                        where += item.Key.ToString() + "='" + item.Value.ToString() + "'";
                }
                else
                {
                    where += item.Key.ToString() + " like '%" + item.Value.ToString() + "%'";
                    
                }
               
            }
            else
            {
                where += item.Key.ToString() + "=" + item.Value.ToString();
            }
            count++;
        }
        return where;
    }
#endregion
   
}