form1.cs

用C#实现了计事本的功能 对初学者相当有用的

                    
                        }
                        zijie = textShow.Text.Length;
                       
                    }
                    else if (result == DialogResult.No)
                    {
                        textShow.Text = "";
                        filePath = null;
                    }
                    else
                    {
                        return;
                    }

                }
            }

            private void Form1_FormClosing(object sender, FormClosingEventArgs e)
            {
                if (textShow.Text == "" || textShow.Text == null || zijie == this.textShow.Text.Length)
                {
                    Application.Exit();
                }
                else
                {
                    DialogResult result = MessageBox.Show("文件" + filePath + "已发生改变是否保存", "提示", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Exclamation);

                    if (result == DialogResult.Yes)
                    {
                        if (filePath == null)
                        {
                            另存为ToolStripMenuItem_Click(this, null);

                        }
                        else
                        {
                            FileStream fs = new FileStream(filePath, FileMode.Create);

                            try
                            {
                                string inshow = textShow.Text;
                                UTF8Encoding encodeing = new UTF8Encoding(true);
                                byte[] by = encodeing.GetBytes(inshow);
                                fs.Write(by, 0, by.Length);
                            }
                            catch (Exception er)
                            {
                                MessageBox.Show(er.Message);
                            }
                            finally
                            {
                                fs.Flush();
                                fs.Close();
                            }
                        }
                        zijie = textShow.Text.Length;
                    }
                    if (result == DialogResult.No)
                    {
                        //**********************************
                        //Application.Exit();关闭
                       
                    }
                    if (result == DialogResult.Cancel)
                    {
                        e.Cancel = true;
                    }
                   
                }

            }

            private void toolStripMenuItem2_Click(object sender, EventArgs e)
            {
                Application.Exit();
            }

            private void 日期ToolStripMenuItem_Click(object sender, EventArgs e)
            {
                DateTime myDateTime = DateTime.UtcNow;
               
                textShow .Text +=myDateTime.ToString();
            }

            private void 关于此记事本ToolStripMenuItem_Click(object sender, EventArgs e)
            {
                Form2 n = new Form2();
                n.ShowDialog();
            }

            private void 自动换行ToolStripMenuItem_Click(object sender, EventArgs e)
            {
                if (this.textShow.WordWrap)
                {
                    this.textShow.WordWrap = false;
                    this.自动换行ToolStripMenuItem.Text = "自动换行(&W)";
                    statusStrip1.Visible = false;
                    df = false;
                }
                else
                {
                    this.textShow.WordWrap = true;
                    this.自动换行ToolStripMenuItem.Text = "√" + this.自动换行ToolStripMenuItem.Text;
                }

            }

            private void 查看GToolStripMenuItem_Click(object sender, EventArgs e)
            {
                if (自动换行ToolStripMenuItem.Text == "自动换行(&W)")
                {
                    状态栏ToolStripMenuItem.Enabled = false;
                }
                else
                {
                    状态栏ToolStripMenuItem.Enabled = true ;
                }
              
            }

            private void 状态栏ToolStripMenuItem_Click(object sender, EventArgs e)
            {
                if (df==false)
                {
                    statusStrip1.Visible =true ;
                    df = true;
                }else if (df ==true )
                {
                    statusStrip1.Visible = false ;
                    df = false ;
                }
            }

            private void timer2_Tick(object sender, EventArgs e)
            {
                toolStripStatusLabel1.Visible = true;
                toolStripStatusLabel2.Visible = true;
                toolStripStatusLabel2.Text =Convert .ToString ( DateTime.Now);

                toolStripStatusLabel6.Text ="  "+textShow.Text .Length; 
            }

            private void 查看GToolStripMenuItem_MouseEnter(object sender, EventArgs e)
            {
                
                this.查看GToolStripMenuItem_Click(this,null );
               
            }

            private void toolStripMenuItem3_Click(object sender, EventArgs e)
            {
                if (textShow.SelectionLength > 0)
                    // Copy the selected text to the Clipboard.
                    textShow.Copy();
            }

            private void toolStripMenuItem4_Click(object sender, EventArgs e)
            {


                if (Clipboard.GetDataObject().GetDataPresent(DataFormats.Text) == true)
                {
                    // Determine if any text is selected in the text box.
                    //if (textShow.SelectionLength > 0)
                    //{
                    //    // Ask user if they want to paste over currently selected text.
                    //    if (MessageBox.Show("Do you want to paste over current selection?", "Cut Example", MessageBoxButtons.YesNo) == DialogResult.No)
                    //        // Move selection to the point after the current selection and paste.
                    //        textShow.SelectionStart = textShow.SelectionStart + textShow.SelectionLength;
                    //}
                    // Paste current text in Clipboard into text box.
                    textShow.Paste();
                }

            }

            private void toolStripMenuItem2_Click_1(object sender, EventArgs e)
            {
                if (textShow.SelectedText != "")
                    // Cut the selected text in the control and paste it into the Clipboard.
                    textShow.Cut();
            }

            private void 编辑ToolStripMenuItem_Click(object sender, EventArgs e)
            {
                if (textShow.SelectionLength == 0)
                {
                    toolStripMenuItem3.Enabled = false;
                    toolStripMenuItem2.Enabled = false;
                    toolStripMenuItem5.Enabled = false;
                }
                else if (textShow.SelectionLength > 0)
                {
                    toolStripMenuItem5.Enabled = true;
                    toolStripMenuItem3.Enabled = true ;
                    toolStripMenuItem2.Enabled = true;
                }
                if (Clipboard.GetDataObject().GetDataPresent(DataFormats.Text) == false)
                {
                    toolStripMenuItem4.Enabled = false;
                }
                else if (Clipboard.GetDataObject().GetDataPresent(DataFormats.Text) == true)
                {
                    toolStripMenuItem4.Enabled = true ;
                }

            }

            private void 编辑ToolStripMenuItem_MouseEnter(object sender, EventArgs e)
            {
                this.编辑ToolStripMenuItem_Click(this, null);
            }

            private void toolStripMenuItem5_Click(object sender, EventArgs e)
            {
               
            }

           

     



        }
    }