首先建立一个XML文件:csharp.xml
<?xml version="1.0" encoding="utf-8" ?>
<definition name="C#" caseSensitive="true">
<word color="BLUE">private</word>
<word color="BLUE">protected</word>
<word color="BLUE">public</word>
<word color="BLUE">namespace</word>
<word color="BLUE">class</word>
<word color="BLUE">for</word>
<word color="BLUE">if</word>
<word color="BLUE">else</word>
<word color="BLUE">while</word>
<word color="BLUE">switch</word>
<word color="BLUE">case</word>
<word color="BLUE">using</word>
<word color="BLUE">get</word>
<word color="BLUE">return</word>
<word color="BLUE">null</word>
<word color="BLUE">void</word>
<word color="BLUE">int</word>
<word color="BLUE">string</word>
<word color="BLUE">float</word>
<word color="BLUE">char</word>
<word color="BLUE">this</word>
<word color="BLUE">set</word>
<word color="BLUE">new</word>
<word color="BLUE">true</word>
<word color="BLUE">false</word>
<word color="BLUE">const</word>
<word color="BLUE">static</word>
<word color="BLUE">internal</word>
<word color="BLUE">extends</word>
<word color="BLUE">super</word>
<word color="BLUE">import</word>
<word color="BLUE">default</word>
<word color="BLUE">break</word>
<word color="BLUE">try</word>
<word color="BLUE">catch</word>
<word color="BLUE">finally</word>
<word color="CadetBlue">Main</word>
<word color="CadetBlue">WriteLine</word>
<word color="CadetBlue">Console</word>
<word color="CadetBlue">WriteLine</word>
<word color="DarkOrange">;</word>
<register>printf</register>
</definition>
然后在VS中新建一工程,添加下面的这个类：
using System;
using System.Xml;
using System.IO;
using System.Collections;
using System.Reflection;
using System.Drawing;
namespace WindowsApplication1
{
public class Parser
{
private XmlDocument xd=null;
private ArrayList al=null; //对xml流解析后，会把每一个关键字字符串放入这个容器中
private bool caseSensitive=false; //记录当前语言大小写敏感否
private ArrayList cl=null;//对xml流解析后，把每一个C关键字颜色保留
internal Parser(SyntaxEditor.Languages language) //构造函数接受一个枚举变量
{
Assembly asm = Assembly.GetExecutingAssembly();
string filename="";
switch(language) //取得xml文件名
{
case SyntaxEditor.Languages.CSHARP:
filename="csharp.xml";
break;
case SyntaxEditor.Languages.JSHARP:
filename="jsharp.xml";
break;
case SyntaxEditor.Languages.SQL:
filename="sql.xml";
break;
case SyntaxEditor.Languages.VBSCRIPT:
filename="vbscript.xml";
break;
default:
break;
}
StreamReader reader= new StreamReader(filename,
System.Text.Encoding.UTF8
); //下面的代码解析xml流
xd=new XmlDocument();
xd.Load(reader);
al=new ArrayList();
cl=new ArrayList();
XmlElement root=xd.DocumentElement;
XmlNodeList xnl=root.SelectNodes("/definition/word");
for(int i=0;i<xnl.Count;i++)
{
al.Add(xnl[i].ChildNodes[0].Value); //将关键子收集到al
cl.Add(xnl[i].Attributes["color"].Value);//收集关键字的颜色
}
//检测是否判断大小写
this.caseSensitive=bool.Parse(root.Attributes["caseSensitive"].Value);
}
public Color IsKeyWord(string word ) //判断字符串是否为关键字
{
for(int i=0;i<al.Count;i++)
{
if(string.Compare(word,al[i].ToString(),!caseSensitive)==0)
{
string ColorTemp=(cl[i].ToString()!=string.Empty?cl[i].ToString():"Black");
Color c;
try
{
c=Color.FromName(ColorTemp);
}
catch (Exception e)
{
c=Color.Black;
}
return c;
}
}
return Color.Black;
}
}
}
然后新建一用户控件继承RichTextBox
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using HWND = System.IntPtr;
namespace WindowsFormsApplication2
{
public partial class SyntaxEditor : System.Windows.Forms.RichTextBox
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
int line;
private Parser parser;
/// <summary>
/// 必需的设计器变量。
/// </summary>
//使用win32api：SendMessage来防止控件着色时的闪烁现象
[DllImport("user32")]
private static extern int SendMessage(HWND hwnd, int wMsg, int wParam, IntPtr lParam);
private const int WM_SETREDRAW = 0xB;
public SyntaxEditor()
{
// 该调用是 Windows.Forms 窗体设计器所必需的。
InitializeComponent();
base.WordWrap = false;
// TODO: 在 InitComponent 调用后添加任何初始化
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
#region 组件设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器
/// 修改此方法的内容。
/// </summary>
#endregion
//重写基类的OnTextChanged方法。为了提高效率，程序是对当前文本插入点所在行进行扫描，
//以空格为分割符，判断每个单词是否为关键字，并进行着色。
protected override void OnTextChanged(EventArgs e)
{
if (base.Text != "")
{
int selectStart = base.SelectionStart;
line = base.GetLineFromCharIndex(selectStart);
string lineStr = base.Lines[line];
int linestart = 0;
for (int i = 0; i < line; i++)
{
linestart += base.Lines[i].Length + 1;
}
SendMessage(base.Handle, WM_SETREDRAW, 0, IntPtr.Zero);
base.SelectionStart = linestart;
base.SelectionLength = lineStr.Length;
base.SelectionColor = Color.Black;
base.SelectionStart = selectStart;
base.SelectionLength = 0;
//对一行字符串用空格或者.分开
string[] words = lineStr.Split(new char[] { ‘ ‘, ‘.‘, ‘\n‘, ‘(‘, ‘)‘, ‘}‘, ‘{‘, ‘"‘, ‘[‘, ‘]‘ });
parser = new Parser(this.language);
for (int i = 0; i < words.Length; i++)//一个字符段一个字符段来判断
{
//判断是否是程序保留字 是的话高亮显示
if (parser.IsKeyWord(words[i]) != Color.Empty)
{
int length = 0;
for (int j = 0; j < i; j++)
{
length += words[j].Length;
}
length += i;
int index = lineStr.IndexOf(words[i], length);
base.SelectionStart = linestart + index;
base.SelectionLength = words[i].Length;
//base.SelectionFont
base.SelectionColor = parser.IsKeyWord(words[i]);
base.SelectionStart = selectStart;
base.SelectionLength = 0;
base.SelectionColor = Color.Black;
}
}
SendMessage(base.Handle, WM_SETREDRAW, 1, IntPtr.Zero);
base.Refresh();
}
base.OnTextChanged(e);
}
public new bool WordWrap
{
get { return base.WordWrap; }
set { base.WordWrap = value; }
}
public enum Languages
{
SQL,
VBSCRIPT,
CSHARP,
JSHARP
}
private Languages language = Languages.CSHARP;
public Languages Language
{
get { return this.language; }
set { this.language = value; }
}
}
}
时间： 2024-04-15 07:10:15