asp.net實現非常實用的自定義頁面基類(附源碼)

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

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>
  /// 在這裡我們給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，並給對象賦值
  /// </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：

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：

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）、對於頁面中控件較多的情況，這個類裡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），用戶控件裡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裡生成實體類（這個可以模仿BasePage寫一個BaseControl類，讓用戶控件繼承BaseControl，然後取值。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）

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，這裡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。對於開發人員，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

<%@ 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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<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

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。