服務器端驗證類

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Reflection;
using EBIZ.WebControls;
using System.Text.RegularExpressions;

namespace System
{
    /// <summary>
    /// ValidatorUtility 的摘要描述
    /// </summary>
    public static class ValidatorUtility
    {
        /// <summary>
        /// 檢查數字類型
        /// </summary>
        /// <param name="val"></param>
        /// <param name="IntLength"></param>
        /// <param name="DecimalLength"></param>
        /// <returns></returns>
        public static bool chkFloat(this string val, int IntLength, int DecimalLength)
        {
            if (val.IsEmpty())
            {
                return true;
            }
            else
            {
                decimal decvalue;
                if (decimal.TryParse(val, out decvalue))
                {
                    string[] arr = decvalue.ToString().Split('.');

                    if (arr.Length == 1)
                    {
                        if (arr[0].Length > IntLength)
                        {
                            return false;
                        }

                        return true;
                    }
                    else if (arr.Length == 2)
                    {
                        if (arr[0].Length > 0 && arr[0].Length > IntLength)
                        {
                            return false;
                        }
                        if (arr[1].Length > 0 && arr[1].Length > DecimalLength)
                        {
                            return false;
                        }

                        return true;
                    }
                }

                return false;
                
            }
 
        }
        /// <summary>
        /// 檢查是否整型
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        public static bool chkInt(this string val)
        {
            int value;
            return int.TryParse(val,out value); 
        }

                                /// <summary>
        /// 元件輸入錯誤
        /// </summary>
        /// <param name="ctl"></param>
        public static void IsError(this Control ctl)
        {
            ctl.Focus();
            PropertyInfo info = ctl.GetType().GetProperty("CssClass");
            string css = info.GetValue(ctl, null).ToString().Replace("error", "");
            info.SetValue(ctl, css + " error", null);
            if (ctl is ListControl && !(ctl is DropDownList))
            {
                ctl.GetType().GetProperty("BorderColor").SetValue(ctl, System.Drawing.Color.Red, null);
                ctl.GetType().GetProperty("BorderWidth").SetValue(ctl, Unit.Pixel(1), null);
            }
            
        }
        /// <summary>
        /// 清除元件錯誤樣式
        /// </summary>
        /// <param name="ctls"></param>
        public static void removeErrorStyle(params Control[] ctls)
        {
            foreach (Control ctl in ctls)
            {
                PropertyInfo info = ctl.GetType().GetProperty("CssClass");

                string css = info.GetValue(ctl, null).ToString().Replace("error", "");
                info.SetValue(ctl, css, null);
                if (ctl is ListControl && !(ctl is DropDownList))
                {
                    ctl.GetType().GetProperty("BorderWidth").SetValue(ctl, Unit.Pixel(0), null);
                }
            }
        }
         /// <summary>
        /// 驗證數據
        /// </summary>
        /// <param name="lblErr"></param>
        /// <param name="ctls"></param>
        /// <returns></returns>
        public static bool Validator(Label lblErr, params Control[] ctls)
        {
            bool blnOk = true;

            removeErrorStyle(ctls);

            foreach (Control ctl in ctls)
            {
                if (ctl.Visible)
                {
                    Type ctlType = ctl.GetType();
                   
                    string css = ctlType.GetProperty("CssClass").GetValue(ctl, null).ToString().ToLower();

                    string errMsg = ctlType.GetProperty("ToolTip").GetValue(ctl, null).ToString();

                    if (ctlType.GetProperty("SelectedItem") != null)
                    {
                        if ((css.Contains("chkempty") || css.Contains("chkchecked")) &&
                            ctlType.GetProperty("SelectedValue").GetValue(ctl, null).ToString() == "")
                        {
                            blnOk = false;
                            ctl.IsError();
                            if ((ctl is DropDownList || ctl is CheckBoxList) && errMsg != "")
                            {
                                lblErr.Text = errMsg;
                            }
                            else
                            {
                                lblErr.Text = "該欄位必選!";
                            }
                            break;
                        }
                    }
                    else if (ctlType.GetProperty("Text") != null)
                    {
                        string value = ctlType.GetProperty("Text").GetValue(ctl, null).ToString();

                        if (css.Contains("chkempty") && value.IsEmpty())
                        {
                            blnOk = false;
                            ctl.IsError();
                            lblErr.Text = errMsg.IsEmpty() ? "該欄位必填!" : errMsg;
                            break;
                        }
                        if (!value.IsEmpty())
                        {
                            if (css.Contains("chklength"))
                            {
                                int len = Convert.ToInt32(((TextBox)ctl).Attributes["maxLen"]);

                                if (value.Trim().Length > len)
                                {
                                    blnOk = false;
                                    ctl.IsError();
                                    lblErr.Text = "該欄位最多只接受 " + len + " 個字元數";
                                    if (ctlType.GetProperty("TextMode").GetValue(ctl, null).ToString() == "MultiLine")
                                    {
                                        lblErr.Text += "(換行佔2個字元)!";
                                    }

                                    break;
                                }
                            }
                            if (css.Contains("chkint") && !value.chkInt())
                            {
                                blnOk = false;
                                lblErr.Text = "該欄位只接受整數！";
                                ctl.IsError();
                                break;
                            }
                            if (css.Contains("chkfloat"))
                            {
                                int intLen = Convert.ToInt32(((TextBox)ctl).Attributes["IntLength"]);
                                int deciLen = Convert.ToInt32(((TextBox)ctl).Attributes["DecimalLength"]);

                                if (!value.chkFloat(intLen, deciLen))
                                {
                                    blnOk = false;
                                    lblErr.Text = String.Format("該欄位只接受 {0} 位正整數 及小數點後 {1} 位！", intLen, deciLen);
                                    ctl.IsError();
                                    break;
                                }
                            }
                            if (css.Contains("chkThanZero"))
                            {
                                if (Convert.ToDouble(value) <= 0)
                                {
                                    blnOk = false;
                                    lblErr.Text ="該欄位必須大於0！";
                                    ctl.IsError();
                                    break;
                                }
                            }
                                                     }
                    }
                   
                }
            }

            return blnOk;
        }
    }
}