文本编辑器实例

  1using System;
  2using System.Collections.Generic;
  3using System.ComponentModel;
  4using System.Data;
  5using System.Drawing;
  6using System.Text;
  7using System.Windows.Forms;
  8using System.IO;
  9using System.Drawing.Printing;
 10
 11namespace WindowsApplication1
 12{
 13    public partial class TextEditor : Form
 14    {
 15        private string filename;
 16        public TextEditor(WindowsApplication1.Main parent)
 17        {
 18            this.MdiParent = parent;
 19            InitializeComponent();
 20        }
 21
 22        private void 退出XToolStripMenuItem_Click(object sender, EventArgs e)
 23        {
 24
 25           if (MessageBox.Show("你确定要退出么？", "退出", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2)==DialogResult.Yes )
 26               this.Close();
 27
 28
 29}
 30        
 31        private void 打开OToolStripMenuItem_Click(object sender, EventArgs e)
 32        {
 33           
 34             openFileDialog1.Title = "打开";
 35            //openFileDialog1.InitialDirectory=@"d:\program files"; //初始目录，注意不要使用硬编码的目录字符串，可能该目录不存在
 36            openFileDialog1.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments); //打开系统定义的目录
 37
 38            openFileDialog1.Filter = "文本文件 (*.txt)|*.txt|VB程序文件 (*.vb)|*.vb |所有文件 (*.*)|*.*|C#类型文件 (*.cs;*.cd)|*.cs;*.cd";
 39            openFileDialog1.FilterIndex = 3; //默认选择过滤类型 从1开始
 40
 41            if (openFileDialog1.ShowDialog() == DialogResult.OK)
 42            {
 43                filename=openFileDialog1.FileName;
 44                //    listBox1.Items.Add(openFileDialog1.FileName);
 45                //foreach (string fl in openFileDialog1.FileNames)
 46                //{
 47                //    listBox1.Items.Add(fl);
 48                //}
 49
 50                OpenFile();
 51
 52                GetFileName();
 53                
 54            }
 55        }
 56
 57        private void OpenFile()
 58        {
 59            try
 60            {
 61                
 62                textBox1.Clear();
 63                textBox1.Text = File.ReadAllText(filename, Encoding.Default);
 64                //textBox1.Text = File.ReadAllText(filename);
 65                //StringBuilder strb = new StringBuilder();
 66
 67                //using (StreamReader sr = new StreamReader(filename))
 68                //{
 69                //    while (sr.Peek() >= 0)
 70                //    {
 71                //        //Console.WriteLine(sr.ReadLine());
 72                //        strb.Append(sr.ReadLine() );
 73                //    }
 74                //}
 75                //textBox1.Text = strb.ToString();
 76            }
 77            catch (IOException ex)
 78            {
 79                MessageBox.Show(ex.Message, "TextEditor", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
 80            }
 81           
 82        }
 83
 84        private void 保存SToolStripMenuItem_Click(object sender, EventArgs e)
 85        {
 86            if (!(filename == null))
 87                SaveFile();
 88            else
 89            {
 90
 91                if (saveFileDialog1.ShowDialog() == DialogResult.OK)
 92                {
 93                    filename = saveFileDialog1.FileName;
 94                    SaveFile();
 95                }
 96            }
 97        }
 98
 99        private void SaveFile()
100        {
101             try
102            {
103                File.WriteAllText(filename, textBox1.Text);
104            }
105            catch (IOException ex)
106            {
107                MessageBox.Show(ex.Message, "TextEditor", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
108            }
109        }
110
111        private void TextEditor_Load(object sender, EventArgs e)
112        {
113            //textBox1.Clear();
114            //filename = "未命名.txt";
115        }
116
117        private void toolStripMenuItem1_Click(object sender, EventArgs e)
118        {
119            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
120            {
121                filename = saveFileDialog1.FileName;
122                SaveFile();
123            }
124        }
125
126        private void 新建NToolStripMenuItem_Click(object sender, EventArgs e)
127        {
128           
129                    textBox1.Clear();
130                    filename = null;
131                    this.Text = "TextEditor";
132               
133        }
134
135        private void GetFileName()
136        {
137            FileInfo fi = new FileInfo(filename);
138            this.Text = fi.Name + " -TextEditor";
139        }
140
141        private string[] lines;
142        private int linesPrinted;
143
144        private void OnPrintPage(object sender, PrintPageEventArgs e)
145        {
146            int x = e.MarginBounds.Left ;
147            int y = e.MarginBounds.Top ;
148
149            while (linesPrinted < lines.Length)
150            {
151                e.Graphics.DrawString(lines[linesPrinted++], new Font("Arial", 10), Brushes.Black, x, y);
152                y += 15;
153                if (y >= e.PageBounds.Bottom )
154                {
155                    e.HasMorePages = true;
156                    return;
157                }
158            }
159
160            linesPrinted = 0;
161            e.HasMorePages = false;
162        }
163
164     
165
166        private void 打印PToolStripMenuItem_Click(object sender, EventArgs e)
167        {
168            try
169            {
170                if (printDialog1.ShowDialog() == DialogResult.OK)
171                {
172                    printDocument1.Print();
173                }
174            }
175            catch (InvalidPrinterException ex)
176            {
177                MessageBox.Show(ex.Message, "Text Editor", MessageBoxButtons.OK, MessageBoxIcon.Error);
178            }
179
180        }
181
182        private void OnBeginPrint(object sender, PrintEventArgs e)
183        {
184            char[] param ={ '\n' };
185            lines = textBox1.Text.Split(param);
186            int i = 0;
187            char[] trimParam ={ '\r' };
188            foreach (string s in lines)
189            {
190                lines[i++] = s.TrimEnd(trimParam);
191            }
192        }
193
194        private void OnEndPrint(object sender, PrintEventArgs e)
195        {
196            lines = null;
197        }
198
199        private void 页面设置UToolStripMenuItem_Click(object sender, EventArgs e)
200        {
201            pageSetupDialog1.ShowDialog();
202        }
203
204        private void 打印预览ToolStripMenuItem_Click(object sender, EventArgs e)
205        {
206            printPreviewDialog1.ShowDialog();
207           
208        }
209       
210    }
211}