将UserControl生成Html代码 (thanks to Jeffrey Zhao )

heros

  1using System;
  2using System.Collections.Generic;
  3using System.Linq;
  4using System.Web;
  5using System.Web.UI;
  6using System.IO;
  7using System.Web.UI.HtmlControls;
  8using System.Reflection;
  9
10/**//// <summary>
11///UserControlRender 的摘要说明
12/// </summary>
13namespace System.Web.UI
14...{
15    public class UserControlRender
16    ...{
17        private Page _thisPage;
18        public UserControlRender()
19        ...{
20            //
21            //TODO: 在此处添加构造函数逻辑
22            //
23        }
24
25        /**//// <summary>
26        /// 加载指定虑拟路径控件
27        /// </summary>
28        /// <param name="path">控件路径</param>
29        /// <returns>返回控件对象</returns>
30        private UserControl LoadUserControl(string path)
31        ...{
32            _thisPage = new MyPage();
33            Control control = _thisPage.LoadControl(path);
34            return (UserControl)control;
35        }
36
37        /**//// <summary>
38        /// 渲染用户控件并生成代码
39        /// </summary>
40        /// <param name="control">目标控件对象</param>
41        /// <returns></returns>
42        private string RenderControlView(UserControl control)
43        ...{
44            AddRangeMark(control);
45
46            StringWriter writer = new StringWriter();
47            this._thisPage.Form.Controls.Add(control);
48            this._thisPage.Server.Execute(this._thisPage, writer, false);
49
50            return RemoveMarkFromControlText(writer.ToString());
51        }
52
53        /**//// <summary>
54        /// 为用户控件内容头尾打上标记
55        /// </summary>
56        /// <param name="control">要渲染的控件</param>
57        private void AddRangeMark(UserControl control)
58        ...{
59            LiteralControl liStart = new LiteralControl();
60            LiteralControl liEnd = new LiteralControl();
61
62            liStart.Text = "<start/>";
63            liEnd.Text = "<end/>";
64
65            control.Controls.AddAt(0, liStart);
66            control.Controls.Add(liEnd);
67        }
68
69        /**//// <summary>
70        /// 将生成的字符串中开始和结束标记去除
71        /// </summary>
72        /// <param name="content">控件生成的代码</param>
73        /// <returns>去除了开始结束标记后的代码</returns>
74        private string RemoveMarkFromControlText(string content)
75        ...{
76            content = content.Substring(content.IndexOf("<start/>") + 9);
77            content = content.Substring(0, content.IndexOf("<end/>"));
78            return content;
79        }
80
81        public string RenderControlView(string path)
82        ...{
83            return RenderControlView(LoadUserControl(path));
84        }
85    }
86
87    public class MyPage : Page
88    ...{
89        HtmlForm form;
90        public MyPage()
91        ...{
92            if (this.Form == null)
93            ...{
94                form = new HtmlForm();
95                this.Controls.Add(form);
96                foreach (MemberInfo item in typeof(Page).FindMembers(MemberTypes.Field, BindingFlags.NonPublic | BindingFlags.Instance, null, null))//查找Page中的_form字段，并将创建的form对象赋值给它
97                ...{
98                    if (item.Name == "_form")
99                    ...{
100                        ((FieldInfo)item).SetValue(this, form);
101                        break;
102                    }
103                }
104            }
105            else
106            ...{
107                form = this.Form;
108            }
109        }
110
111    }
112}
113