.Net常用技巧_生成物料编号（根据分类代码生成）

using System;
using System.Collections.Generic;
using System.Text;
using EXDataControl;
using System.Data;
using System.Data.SqlClient;
using Utility;

namespace MyTool
{
    public class CreateMaterialCode
    {
        /// <summary>
        /// 获取新物料编号(要查询的字段，物料分类编号，要查询的数据库表名)；编码为7位
        /// </summary>
        /// <param name="Fieldname"></param>
        /// <param name="MaterialTypeID"></param>
        /// <param name="TableName"></param>
        /// <returns></returns>
        public static string GetNewCode(EXDataControl.EXDataCenter dc, string Fieldname, string ClassCode, string TableName)
        {
            if (string.IsNullOrEmpty(Fieldname) == true || string.IsNullOrEmpty(ClassCode) == true || string.IsNullOrEmpty(TableName) == true)
            {
                Utility.MsgBox.MessageShowErrors("GetNewCode方法的参数传递有空值！系统将返回null值。");
                return null;
            }

            //参数
            string shortCode = "";
            string strClassCode = ClassCode;
            string tableName = TableName;
            string key_fieldname = Fieldname;

            //查找到的最大物料编号
            string oldMaxCode = "";

            #region   取出最大编号

            //string sqlSearch2 = "select Max(" + key_fieldname + ")as DocNum from " + tableName + " Where " + key_fieldname + " like‘" + shortCode + "%‘";
            string sqlSearch2 = "select Max(" + key_fieldname + ")as DocNum from " + tableName + " Where " + key_fieldname + " like‘" + strClassCode + "[^A-z]%‘";     //第N位不为字母
            DataTable dtTemp2 = new DataTable();
            try
            {
                dtTemp2 = dc.getDataSetBySql(sqlSearch2).Tables[0];
                if (dtTemp2.Rows.Count > 0)
                {
                    oldMaxCode = dtTemp2.Rows[0]["DocNum"].ToString();
                }
            }
            catch (Exception ex)
            {
                Utility.MsgBox.MessageShowErrors("查询最大旧编号错误：" + ex.ToString());
                return null;
            }

            #endregion

            //将取出的物料编号处理
            //如果没找到，则默认为什么，否则累计增1
            string startnum = "1";
            if ((oldMaxCode == null) || (string.IsNullOrEmpty(oldMaxCode.ToString()) == true))
            {
                try
                {
                    startnum = "1";     //取得起始值 
                }
                catch
                { }
            }
            else
            {
                string maxID = oldMaxCode.ToString();
                string oldnum = maxID.Substring(strClassCode.Length);   //截去字母位长度
                int newnum = int.Parse(oldnum) + 1;
                startnum = newnum.ToString();

            }

            startnum = "0000000000" + startnum;             //10位编码
            string NewCode = strClassCode + startnum.Substring(startnum.Length - (10 - strClassCode.Length));   //从指定位置，取指定长度(startnum-10的位置开动始，取10位)

            return NewCode;
        }

    }
}