本文實例講述了asp.net實現非常實用的自定義頁面基類。分享給大家供大家參考，具體如下：
看到前面幾篇文章（如：《asp.net實現利用反射，泛型，靜態方法快速獲取表單值到Model的方法》）想到的。下面總結發布一個筆者在開發中常用的一個自定義BasePage類,廢話不多說了，直接貼代碼。
一、BasePage類
1、代碼
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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.Reflection;namespace DotNet.Common.WebForm{ using DotNet.Common.Model; using DotNet.Common.Util; public class BasePage : System.Web.UI.Page { public BasePage() { } protected override void OnInit(EventArgs e) { base.OnInit(e); //CancelFormControlEnterKey(this.Page.Form.Controls); //取消頁面文本框的enter key } #region 取消頁面文本控件的enter key功能 /// <summary> /// 在這里我們給Form中的服務器控件添加客戶端onkeydown腳步事件，防止服務器控件按下enter鍵直接回發 /// </summary> /// <param name="controls"></param> public virtual void CancelFormControlEnterKey(ControlCollection controls) { //向頁面注冊腳本 用來取消input的enter key功能 RegisterUndoEnterKeyScript(); foreach (Control item in controls) { //服務器TextBox if (item.GetType() == typeof(System.Web.UI.WebControls.TextBox)) { WebControl webControl = item as WebControl; webControl.Attributes.Add("onkeydown", "return forbidInputKeyDown(event)"); } //html控件 else if (item.GetType() == typeof(System.Web.UI.HtmlControls.HtmlInputText)) { HtmlInputControl htmlControl = item as HtmlInputControl; htmlControl.Attributes.Add("onkeydown", "return forbidInputKeyDown(event)"); } //用戶控件 else if (item is System.Web.UI.UserControl) { CancelFormControlEnterKey(item.Controls); //遞歸調用 } } } /// <summary> /// 向頁面注冊forbidInputKeyDown腳本 /// </summary> private void RegisterUndoEnterKeyScript() { string js = string.Empty; System.Text.StringBuilder sb = new System.Text.StringBuilder(); sb.Append("function forbidInputKeyDown(ev) {"); sb.Append(" if (typeof (ev) != \"undefined\") {"); sb.Append(" if (ev.keyCode || ev.which) {"); sb.Append(" if (ev.keyCode == 13 || ev.which == 13) { return false; }"); sb.Append(" } } }"); js = sb.ToString(); if (!this.Page.ClientScript.IsClientScriptBlockRegistered("forbidInput2KeyDown")) this.Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "forbidInput2KeyDown", js, true); } #endregion #region 利用反射取/賦頁面控件的值 /// <summary> /// 從頁面中取控件值，并給對象賦值 /// </summary> /// <param name="dataType">要被賦值的對象類型</param> /// <returns></returns> public virtual BaseObj GetFormData(Type dataType) { BaseObj data = (BaseObj)Activator.CreateInstance(dataType);//實例化一個類 Type pgType = this.GetType(); //標識當前頁面 BindingFlags bf = BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic;//反射標識 PropertyInfo[] propInfos = data.GetType().GetProperties();//取出所有公共屬性 foreach (PropertyInfo item in propInfos) { FieldInfo fiPage = pgType.GetField(item.Name, bf);//從頁面中取出滿足某一個屬性的字段 if (fiPage != null) //頁面的字段不為空,代表存在一個實例化的控件類 { object value = null; Control pgControl = (Control)fiPage.GetValue(this); //根據屬性，找到頁面對應控件，這要求頁面控件命名必須和對象的屬性一一對應相同 //下面取值 Type controlType = pgControl.GetType(); if (controlType == typeof(Label)) { value = ((Label)pgControl).Text.Trim(); } else if (controlType == typeof(TextBox)) { value = ((TextBox)pgControl).Text.Trim(); } else if (controlType == typeof(HtmlInputText)) { value = ((HtmlInputText)pgControl).Value.Trim(); } else if (controlType == typeof(HiddenField)) { value = ((HiddenField)pgControl).Value.Trim(); } else if (controlType == typeof(CheckBox)) { value = (((CheckBox)pgControl).Checked);//復選框 } else if (controlType == typeof(DropDownList))//下拉框 { value = ((DropDownList)pgControl).SelectedValue; } else if (controlType == typeof(RadioButtonList))//單選框列表 { value = ((RadioButtonList)pgControl).SelectedValue; if (value != null) { if (value.ToString().ToUpper() != "TRUE" && value.ToString().ToUpper() != "FALSE") value = value.ToString() == "1" ? true : false; } } else if (controlType == typeof(Image)) //圖片 { value = ((Image)pgControl).ImageUrl; } try { object realValue = null; if (item.PropertyType.Equals(typeof(Nullable<DateTime>))) //泛型可空類型 { if (value != null) { if (string.IsNullOrEmpty(value.ToString())) { realValue = null; } else { realValue = DateTime.Parse(value.ToString()); } } } else if (item.PropertyType.Equals(typeof(Nullable))) //可空類型 { realValue = value; } else { try { realValue = Convert.ChangeType(value, item.PropertyType); } catch { realValue = null; } } item.SetValue(data, realValue, null); } catch (FormatException fex) { DotNet.Common.Util.Logger.WriteFileLog(fex.Message, HttpContext.Current.Request.PhysicalApplicationPath + "LogFile"); throw fex; } catch (Exception ex) { DotNet.Common.Util.Logger.WriteFileLog(ex.Message, HttpContext.Current.Request.PhysicalApplicationPath + "LogFile"); throw ex; } } } return data; } /// <summary> /// 通過對象的屬性值，給頁面控件賦值 /// </summary> /// <param name="data"></param> public virtual void SetFormData(BaseObj data) { Type pgType = this.GetType(); BindingFlags bf = BindingFlags.Public | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Static; PropertyInfo[] propInfos = data.GetType().GetProperties(); foreach (PropertyInfo item in propInfos) { FieldInfo myField = pgType.GetField(item.Name, bf); if (myField != null) { Control myControl = (Control)myField.GetValue(this); //根據屬性名取到頁面控件 object value = item.GetValue(data, null); //取對象的屬性值 Type propType = item.PropertyType; if (value != null) { Type valueType = value.GetType(); try { Type controlType = myControl.GetType(); if (controlType == typeof(Label)) { if (valueType == typeof(DateTime)) { ((Label)myControl).Text = (Convert.ToDateTime(value)).ToShortDateString(); } else { ((Label)myControl).Text = value.ToString(); } } else if (controlType == typeof(TextBox)) { if (valueType == typeof(DateTime)) { ((TextBox)myControl).Text = (Convert.ToDateTime(value)).ToShortDateString(); } else { ((TextBox)myControl).Text = value.ToString(); } } else if (controlType == typeof(HtmlInputText)) { if (valueType == typeof(DateTime)) { ((HtmlInputText)myControl).Value = (Convert.ToDateTime(value)).ToShortDateString(); } else { ((HtmlInputText)myControl).Value = value.ToString(); } } else if (controlType == typeof(HiddenField)) { ((HiddenField)myControl).Value = value.ToString(); } else if (controlType == typeof(CheckBox)) { if (valueType == typeof(Boolean)) //布爾型 { if (value.ToString().ToUpper() == "TRUE") ((CheckBox)myControl).Checked = true; else ((CheckBox)myControl).Checked = false; } else if (valueType == typeof(Int32)) //整型 (正常情況下,1標識選擇,0標識不選) { ((CheckBox)myControl).Checked = string.Compare(value.ToString(), "1") == 0; } } else if (controlType == typeof(DropDownList)) { try { ((DropDownList)myControl).SelectedValue = value.ToString(); } catch { ((DropDownList)myControl).SelectedIndex = -1; } } else if (controlType == typeof(RadioButton)) { if (valueType == typeof(Boolean)) //布爾型 { if (value.ToString().ToUpper() == "TRUE") ((RadioButton)myControl).Checked = true; else ((RadioButton)myControl).Checked = false; } else if (valueType == typeof(Int32)) //整型 (正常情況下,1標識選擇,0標識不選) { ((RadioButton)myControl).Checked = string.Compare(value.ToString(), "1") == 0; } } else if (controlType == typeof(RadioButtonList)) { try { if (valueType == typeof(Boolean)) //布爾型 { if (value.ToString().ToUpper() == "TRUE") ((RadioButtonList)myControl).SelectedValue = "1"; else ((RadioButtonList)myControl).SelectedValue = "0"; } else ((RadioButtonList)myControl).SelectedValue = value.ToString(); } catch { ((RadioButtonList)myControl).SelectedIndex = -1; } } else if (controlType == typeof(Image)) { ((Image)myControl).ImageUrl = value.ToString(); } } catch (FormatException fex) { DotNet.Common.Util.Logger.WriteFileLog(fex.Message, HttpContext.Current.Request.PhysicalApplicationPath + "LogFile"); } catch (Exception ex) { DotNet.Common.Util.Logger.WriteFileLog(ex.Message, HttpContext.Current.Request.PhysicalApplicationPath + "LogFile"); } } } } } #endregion #region 日志處理 /// <summary> /// 出錯處理:寫日志,導航到公共出錯頁面 /// </summary> /// <param name="e"></param> protected override void OnError(EventArgs e) { Exception ex = this.Server.GetLastError(); string error = this.DealException(ex); DotNet.Common.Util.Logger.WriteFileLog(error, HttpContext.Current.Request.PhysicalApplicationPath + "LogFile"); if (ex.InnerException != null) { error = this.DealException(ex); DotNet.Common.Util.Logger.WriteFileLog(error, HttpContext.Current.Request.PhysicalApplicationPath + "LogFile"); } this.Server.ClearError(); this.Response.Redirect("/Error.aspx"); } /// <summary> /// 處理異常，用來將主要異常信息寫入文本日志 /// </summary> /// <param name="ex"></param> /// <returns></returns> private string DealException(Exception ex) { this.Application["StackTrace"] = ex.StackTrace; this.Application["MessageError"] = ex.Message; this.Application["SourceError"] = ex.Source; this.Application["TargetSite"] = ex.TargetSite.ToString(); string error = string.Format("URl：{0}\n引發異常的方法：{1}\n錯誤信息：{2}\n錯誤堆棧：{3}\n", this.Request.RawUrl, ex.TargetSite, ex.Message, ex.StackTrace); return error; } #endregion }} |
2、使用反射給控件賦值
根據id取一個員工（Employee），Employee類繼承自BaseObj類，根據這個客戶對象給頁面控件賦值：
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using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Text;using System.Threading;namespace WebTest{ using DotNet.Common.WebForm; using DotNet.Common.Model; using EntCor.Hrm.Model; public partial class _Default : BasePage { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { Employee employee = new Employee { ID = 1, UserName = "jeff wong", Address = "北京", IsLeave = false, RealName = "測試用戶", State = "2" }; this.SetFormData(employee); //給頁面控件賦值 } } }} |
3、使用反射給對象賦值
點擊”測試”按鈕，將頁面控件（runat=server）的值賦給實體對象：
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protected void btnSet_Click(object sender, EventArgs e){ Employee employee = (Employee)this.GetFormData(typeof(Employee)); StringBuilder sb = new StringBuilder(); sb.Append("登錄名:" + employee.UserName + "<br/>"); sb.Append("真實姓名:" + employee.RealName + "<br/>"); sb.Append("所在地:" + employee.Address + "<br/>"); sb.Append("是否離職:" + employee.IsLeave + "<br/>"); sb.Append("在職狀態:" + employee.State + "<br/>"); this.ltrContext.Text = sb.ToString();} |
總結：
（1）、對于頁面中控件較多的情況，這個類里的反射取值和賦值的方法還是很有用的（比較惡心的是你要哼唧哼唧地對照實體類給頁面控件命名。kao，實體類有代碼生成器自動生成我就忍了，頁面控件還要一一對應地命名，估計很多程序員在這方面沒少花時間，還有就是不考慮反射對性能的影響）。不過從代碼的簡潔程度來看，這個確實顯得out了；不過呢，筆者習慣了，命名多就多一些吧，在找到穩定可靠的解決方案之前，短時間看來是不會選擇改進的了；
（2）、如果頁面中有用戶控件（UserControl），用戶控件里的子控件直接在頁面中就比較難取到了（你可能已經看出問題的端倪來了），解決的方法就是在用戶控件里生成實體類（這個可以模仿BasePage寫一個BaseControl類，讓用戶控件繼承BaseControl，然后取值。本來想另開一篇介紹一下的，可是發現實現代碼雷同，放棄）；
（3）、取消頁面文本框的enter key您可以參考《asp.net實現取消頁面表單內文本輸入框Enter響應的方法》；
（4）、異常處理見（二）。
二、異常處理
1、日志類（自己寫的一個簡單通用的文本日志處理類）
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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using System.Web;namespace DotNet.Common.WebForm{ /// <summary> /// 日志類(常用的都是log4net，這里簡陋地實現一個寫入文本日志類) /// </summary> public static class LogUtil { /// <summary> /// 寫入異常日志 /// </summary> /// <param name="ex"></param> public static void WriteFileLog(string exMsg) { string path = HttpContext.Current.Request.PhysicalApplicationPath + "LogFile"; FileStream fs = null; StreamWriter m_streamWriter = null; try { if (!Directory.Exists(path)) { Directory.CreateDirectory(path); } path = path + "\\" + DateTime.Now.ToString("yyyyMMdd") + ".txt"; fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write); m_streamWriter = new StreamWriter(fs); m_streamWriter.BaseStream.Seek(0, SeekOrigin.End); m_streamWriter.WriteLine(DateTime.Now.ToString() + "\n"); m_streamWriter.WriteLine("-----------------------------------------------------------"); m_streamWriter.WriteLine("-----------------------------------------------------------"); m_streamWriter.WriteLine(exMsg); m_streamWriter.WriteLine("-----------------------------------------------------------"); m_streamWriter.WriteLine("-----------------------------------------------------------"); m_streamWriter.Flush(); } finally { if (m_streamWriter != null) { m_streamWriter.Close(); } if (fs != null) { fs.Close(); } } } }} |
2、Error.aspx
這個比較無語。通常用來提供一個有好的出錯頁面。對于開發人員，建議顯示完整的異常信息。
下面貼一個對開發人員有幫助的頁面：
（1）、設計頁面
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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Error.aspx.cs" Inherits="Error" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><head runat="server"> <title>出錯啦</title></head><body> <form id="form1" runat="server"> <div> <table width='100%' align='center' style='font-size: 10pt; font-family: Trebuchet MS, Arial'> <tr align='center'> <td align="center" colspan="2"> <b>Error on page</b> </td> </tr> <tr> <td align='right' width="200"> <b>stackTrace :</b> </td> <td align='left'> <asp:Label ID="lblStackTrace" runat="server"></asp:Label> </td> </tr> <tr> <td align='right'> <b>Error message :</b> </td> <td align='left'> <asp:Label ID="lblMessageError" runat="server"></asp:Label> </td> </tr> <tr> <td align='right'> <b>Source :</b> </td> <td align='left'> <asp:Label ID="lblSourceError" runat="server"></asp:Label> </td> </tr> <tr> <td align='right'> <b>TargetSite :</b> </td> <td align='left'> <asp:Label ID="lblTagetSiteError" runat="server"></asp:Label> </td> </tr> </table> </div> </form></body></html> |
（2）、實現代碼
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using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;public partial class ErrorPage : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { this.lblStackTrace.Text = this.Application["StackTrace"] as string; this.lblMessageError.Text = this.Application["MessageError"] as string; this.lblSourceError.Text = this.Application["SourceError"] as string; this.lblTagetSiteError.Text = this.Application["TargetSite"] as string; }} |
完整實例代碼代碼點擊此處本站下載。
希望本文所述對大家asp.net程序設計有所幫助。
