sdk/samples/all in on code/Visual Studio 2010/CSASPNETHighlightCodeInPage/HighlightCodePage.aspx.cs

   1 /**************************** Module Header ********************************\
   2 * Module Name:    HighlightCodePage.aspx.cs
   3 * Project:        CSASPNETHighlightCodeInPage
   4 * Copyright (c) Microsoft Corporation
   5 *
   6 * Sometimes we input code like C# or HTML in our post and we need these code
   7 * to be highlighted for a better reading experience.The project illustrates how
   8 * to highlight the code in a page.
   9
  10 * This page is used to let user highlight the code.
  11
  12 * This source is subject to the Microsoft Public License.
  13 * See http://www.microsoft.com/opensource/licenses.mspx#Ms-PL.
  14 * All other rights reserved.
  15 *
  16 \***************************************************************************/
  17
  18 using System;
  19 using System.Web.UI.WebControls;
  20 using System.Collections;
  21
  22 namespace CSASPNETHighlightCodeInPage
  23 {
  24     public partial class HighlightCodePage : System.Web.UI.Page
  25     {
  26         protected void Page_Load(object sender, EventArgs e)
  27         {
  28             this.lbError.Visible = false;
  29             this.lbResult.Visible = false;
  30         }
  31
  32         protected void btnHighLight_Click(object sender, EventArgs e)
  33         {
  34             string _error = string.Empty;
  35
  36             // Check the value of user's input data.
  37             if (CheckControlValue(this.ddlLanguage.SelectedValue,
  38                 this.tbCode.Text, out _error))
  39             {
  40                 // Initialize the Hashtable variable which used to
  41                 // store the different languages of code and their
  42                 // related regular expressions with matching options.
  43                 Hashtable _htb = CodeManager.Init();
  44
  45                 // Initialize the suitable collection object.
  46                 RegExp _rg = new RegExp();
  47                 _rg = (RegExp)_htb[this.ddlLanguage.SelectedValue];
  48                 this.lbResult.Visible = true;
  49                 if (this.ddlLanguage.SelectedValue != "html")
  50                 {
  51                     // Display the highlighted code in a label control.
  52                     this.lbResult.Text = CodeManager.Encode(
  53                         CodeManager.HighlightCode(
  54                         Server.HtmlEncode(this.tbCode.Text)
  55                         .Replace("&quot;", "\""),
  56                         this.ddlLanguage.SelectedValue, _rg)
  57                         );
  58                 }
  59                 else
  60                 {
  61                     // Display the highlighted code in a label control.
  62                     this.lbResult.Text = CodeManager.Encode(
  63                         CodeManager.HighlightHTMLCode(this.tbCode.Text, _htb)
  64                         );
  65                 }
  66             }
  67             else
  68             {
  69                 this.lbError.Visible = true;
  70                 this.lbError.Text = _error;
  71             }
  72         }
  73         public bool CheckControlValue(string selectValue,
  74             string inputValue,
  75             out string error)
  76         {
  77             error = string.Empty;
  78             if (selectValue == "-1")
  79             {
  80                 error = "Please choose the language.";
  81                 return false;
  82             }
  83             if (string.IsNullOrEmpty(inputValue))
  84             {
  85                 error = "Please paste your code in the textbox control.";
  86                 return false;
  87             }
  88             return true;
  89         }
  90     }
  91 }