这两天也在学习写IronPython For ASP.Net 的Web程序，可是在学习的过程中，遇到一个IronPython和C＃对用户控件模型的解析不一致的情况，理解不了，就写出来，请大家有兴趣的帮我解惑。
IronPython和C＃都是写一个简单的用户控件，可是它们在解析用户控件的私有方法是，却不一致。
先看IronPython的。
<%@ Control Language="IronPython" ClassName="ListPicker" %><script runat="server">def Page_Load(): __PrivateMethod("1") PublicMethod("2") def __PrivateMethod(text) : lblPrivate.Text = "private %s" % text def PublicMethod(text) : lblPublic.Text = "public %s " % text def Private_Click(sender,e): __PrivateMethod("3")</script><asp:Label ID=lblPrivate runat=server></asp:Label><br /><asp:Label ID=lblPublic runat=server></asp:Label><asp:Button ID=btnPrivate OnClick="Private_Click" runat=server /> 控件名是联系IronPython For ASP.Net CTP中的例程时候遗留的，就没改。
按照python的语法，类的成员的标识符如果以_打斗，那该成员就是私有的。
好，那对应的C#写的ListPicker就应该如下。
<%@ Control Language="C#" ClassName="ListPicker"%><script runat="server"> void Page_Load(object sender, EventArgs e) 
{
PrivateMethod("1"); PublicMethod("2");
} private void PrivateMethod(string text) { lblPrivate.Text = "private " + text; } public void PublicMethod(string text) { lblPublic.Text = "public " + text; } private void Private_Click(object sender, EventArgs e) { PrivateMethod("Private_Click"); } </script><asp:Label ID=lblPrivate runat=server></asp:Label><br /><asp:Label ID=lblPublic runat=server></asp:Label><asp:Button ID=btnPrivate OnClick="Private_Click" runat=server /> 同样，PrivateMethod由于有private限定，也是私有的。
现在，问题出现了. Python 版的站点页面注册引用ListPicker后，可以访问ListPicer1.__PrivateMethod,一个简单的aspx页面如下。
<%@ Page Language="IronPython" CodeFile="Default.aspx.py" %><%@ Register Src="ListPicker.ascx" TagName="ListPicker" TagPrefix="uc1" %><!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>Untitled Page</title></head><body> <form id="form1" runat="server"> <div> <uc1:ListPicker id="ListPicker1" runat="server"> </uc1:ListPicker> <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" /></div> </form></body></html> 与之相对应的py代码文件是：
import Systemfrom System.Data import *from System.Web import *from System.Web.UI import *from clr import *def Page_Load(): pass def Button1_Click(sender,e): ListPicker1.__PrivateMethod("ff") 该IronPython 站点运行正常。
同样的，另一个站点C#版的Default.aspx和Default.aspx.cs分别如下：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><%@ Register Src="ListPicker.ascx" TagName="ListPicker" TagPrefix="uc1" %><!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>Untitled Page</title></head><body> <form id="form1" runat="server"> <div> <uc1:ListPicker ID="ListPicker1" runat="server" /> <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /> </div> </form></body></html>
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;public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e)
{
} protected void Button1_Click(object sender, EventArgs e) { ListPicker1.PrivateMethod("3"); } }
此C#站点程序则出现编译错误：
Server Error in '/First' Application.--------------------------------------------------------------------------------Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS0117: 'ASP.ListPicker' does not contain a definition for 'PrivateMethod'Source Error: Line 17: protected void Button1_Click(object sender, EventArgs e)Line 18: {Line 19: ListPicker1.PrivateMethod("3");Line 20: }Line 21: Source File: d:\WWWForDotnet2\First\Default.aspx.cs Line: 19 下面，我的困惑是。 为什么IronPython的default.aspx.py文件里可以访问ListPicker1.__PrivateMethod？难道IronPython不是按照经典的Asp.Net控件模型来生成用户控件的？ 为了验证，我把IronPython版的ListPicker控件里btnButton的Click事件def PrivateClick改成def __PrivateClick，却出现解析错误。
Server Error in '/Second' Application.--------------------------------------------------------------------------------Parser Error Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. Parser Error Message: The page doesn't have an event handler named 'Private_Click'Source Error: Line 20: <asp:Label ID=lblPrivate runat=server></asp:Label><br />Line 21: <asp:Label ID=lblPublic runat=server></asp:Label>Line 22: <asp:Button ID=btnPrivate OnClick="Private_Click" runat=server /> Source File: /Second/ListPicker.ascx Line: 22 按照这个错误提示来看，似乎IronPython又是按照Asp.Net经典模型来实现的。
令人费解啊。
可是还有费解的。 将Default.aspx.cs里的ListPicker1.PrivateMethod访问改成ListerPicker1.PublicMethod，让程序能运行。 同时，改动C#版的ListPicker的btnClick的事件声明为pirvate void Private_Click, btnClick控件的Click事件照样能得到响应。
再一次费解。
热切希望了解其中原因的朋友指点，不然，我可能要失眠几个晚上了。
