【Form窗体】文件操作完成记事本功能

      对于 文件操作常用的就是文件读写，文件打开，文件保存等本文将制作一个记事本，完成基本的文件操作。并对常用控件包括对话框和菜单以及状态栏综合运用。

下面谈下设计思想，然后再看具体实现。（部分功能代码参考网络资源）

      在布局上样式和计算机自带记事本功能都是一致的，这里难点和关键点就是逻辑方面的判断。剪切复制等可用不可用逻辑问题。以及何时保存，还有就是打印等需要一些API（自带方法）。现在把整个界面布局粘贴如下：（下面红色为打印所需对话框）

1，两个核心方法：保存和另存为

       private void MainForm_Load(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Maximized;
            
            this.time.Text = DateTime.Now.ToString();
        }
        /// 保存文件
        void SaveText()
        {
            try
            {
                    saveFileDialog1.FileName = "";
                    saveFileDialog1.Filter = "文本文件(*.txt)|*.txt";
                    if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                    {
                        string MyFileName = saveFileDialog1.FileName;
                        StreamWriter sw = new StreamWriter(MyFileName, true, Encoding.Default);
                        sw.WriteLine(rtxContent.Text);
                       
                        this.Text = MyFileName.Substring(MyFileName.LastIndexOf("\\") + 1);
                    }
             
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            { }
        }
        //另存为
         private void HoldFile()
        {
            saveFileDialog1.Filter = "文本文件(*.txt)|*.txt";
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                StreamWriter sw = new StreamWriter(saveFileDialog1.FileName, false);
                sw.WriteLine(rtxContent.Text);
                sw.Close();
                MessageBox.Show("文件保存成功！", "温馨提示");
            }
            // 判断是第一次保存还是第二次
            if (saveFileDialog1.Equals(""))
            {
                FileInfo fileInfo = new FileInfo(saveFileDialog1.FileName);
                Text = fileInfo.Name + "-记事本";
                saveFileDialog1.FileName = fileInfo.Name;
            }
            else
            {
                // 把标题改为打开的文件的名称
                Text = saveFileDialog1.FileName + "-Mickey记事本";
            }
        }

2，打开文件，涉及文件读取（文件流读取）

        //打开文件
        private void FileMenuOpen_Click(object sender, EventArgs e)
        {
            try 
            {
                if (rtxContent.Text != "")
                {
                    SaveText(); //检查是否保存当前文件
                }
                else
                {
                    if (openFileDialog1.ShowDialog() == DialogResult.OK)
                    {
                         StreamReader sr = new StreamReader(openFileDialog1.FileName);
                         rtxContent.Text = sr.ReadToEnd();
                         sr.Close();
                         FileInfo fileInfo = new FileInfo(openFileDialog1.FileName);
                        // 把标题改为打开的文件的名称
                        Text = "*" + fileInfo.Name + "-白宁超记事本";
                        openFileDialog1.FileName = fileInfo.Name;
                    }    
                }            
            }
            catch (Exception ex) { MessageBox.Show(ex.Message); }
            finally { }
        }

3，字体颜色设置以及所用对话框

        //设置字体
        private void FileMenuFont_Click(object sender, EventArgs e)
        {
            if (fontDialog1.ShowDialog() == DialogResult.OK)
            {
                rtxContent.Font = fontDialog1.Font;
            }
        }
        //设置颜色
        private void FileMenuColor_Click(object sender, EventArgs e)
        {
            if ( colorDialog1.ShowDialog() == DialogResult.OK)
            {
                rtxContent.ForeColor = colorDialog1.Color;
            }
        }

4，页面设置和打印

        //页面设置
        private void FileMenuPage_Click(object sender, EventArgs e)
        {
            this.pageSetupDialog1.Document = this.printDocument1;
            pageSetupDialog1.ShowDialog();
        }
        //打印
        private void FileMenuDY_Click(object sender, EventArgs e)
        {
            if (rtxContent.Text.Length < 1)
            {
                MessageBox.Show("请确保要打印的文件的内容不为空！", "温馨提示");
                return;
            }
            else
            {
                // 设置Document的属性
                this.printDialog1.Document = this.printDocument1;
                this.printDialog1.PrinterSettings = this.pageSetupDialog1.PrinterSettings;
                if (this.printDialog1.ShowDialog() == DialogResult.OK)
                {
                    try
                    {
                        this.printDocument1.Print();
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message, "错误信息", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
        }

5，窗体视图显示：水平，竖直，层叠

        //多窗体水平显示
        private void FileMenuH_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.TileHorizontal);
        }
        //多窗体垂直显示
        private void FileMenuV_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.TileVertical);
        }
        //多窗体层叠显示
        private void FileMenuC_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.Cascade);
        }        

6，根据文本变化而状态变化

       //根据文本变化而状态变化
        private void rtxContent_TextChanged(object sender, EventArgs e)
        {
            this.total.Text = "当前计数" + this.rtxContent.Text.Length.ToString();
        }

---

以下是全部完整代码（经测试可以正常运行）

 public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }
        //窗体加载
        private void MainForm_Load(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Maximized;
            
            this.time.Text = DateTime.Now.ToString();
        }
        /// 保存文件
        void SaveText()
        {
            try
            {
                    saveFileDialog1.FileName = "";
                    saveFileDialog1.Filter = "文本文件(*.txt)|*.txt";
                    if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                    {
                        string MyFileName = saveFileDialog1.FileName;
                        StreamWriter sw = new StreamWriter(MyFileName, true, Encoding.Default);
                        sw.WriteLine(rtxContent.Text);
                       
                        this.Text = MyFileName.Substring(MyFileName.LastIndexOf("\\") + 1);
                    }
             
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            { }
        }
        //另存为
         private void HoldFile()
        {
            saveFileDialog1.Filter = "文本文件(*.txt)|*.txt";
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                StreamWriter sw = new StreamWriter(saveFileDialog1.FileName, false);
                sw.WriteLine(rtxContent.Text);
                sw.Close();
                MessageBox.Show("文件保存成功！", "温馨提示");
            }
            // 判断是第一次保存还是第二次
            if (saveFileDialog1.Equals(""))
            {
                FileInfo fileInfo = new FileInfo(saveFileDialog1.FileName);
                Text = fileInfo.Name + "-记事本";
                saveFileDialog1.FileName = fileInfo.Name;
            }
            else
            {
                // 把标题改为打开的文件的名称
                Text = saveFileDialog1.FileName + "-Mickey记事本";
            }
        }
        //新建
        private void FileMenuNew_Click(object sender, EventArgs e)
        {
            if (rtxContent.Text != "")
            {
               if (MessageBox.Show("是否保存当前文件？", "温馨提示", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Information)== DialogResult.Yes)
                {
                    // 保存文件
                    SaveText();
                    Text = "新建-Mickey记事本";
                    rtxContent.Text = "";
                }
                else if (MessageBox.Show("是否保存当前文件？", "温馨提示", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Information)== DialogResult.No)
                {
                    // 用户选择不保存时将输入框中的内容清除
                    rtxContent.Text = "";
                }
            }
        }
        //打开文件
        private void FileMenuOpen_Click(object sender, EventArgs e)
        {
            try 
            {
                if (rtxContent.Text != "")
                {
                    SaveText(); //检查是否保存当前文件
                }
                else
                {
                    if (openFileDialog1.ShowDialog() == DialogResult.OK)
                    {
                         StreamReader sr = new StreamReader(openFileDialog1.FileName);
                         rtxContent.Text = sr.ReadToEnd();
                         sr.Close();
                         FileInfo fileInfo = new FileInfo(openFileDialog1.FileName);
                        // 把标题改为打开的文件的名称
                        Text = "*" + fileInfo.Name + "-白宁超记事本";
                        openFileDialog1.FileName = fileInfo.Name;
                    }    
                }            
            }
            catch (Exception ex) { MessageBox.Show(ex.Message); }
            finally { }
        }
        //保存
        private void FileMenuSave_Click(object sender, EventArgs e)
        {
            SaveText();
        }
        //另存为
        private void FileMenuLingcun_Click(object sender, EventArgs e)
        {
            HoldFile();
        }
        //关闭
        private void FileMenuClose_Click(object sender, EventArgs e)
        {
            DialogResult result = MessageBox.Show("是否将更改保存？", "温馨提示", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Information);
            if (result == DialogResult.Yes)
            {
                SaveText();
                Application.Exit();
            }
            else if (result == DialogResult.No)
            {
                Application.Exit();
            }
        }
         private string selectedInfo = "";//定义选中文本
        private void 编辑EToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if ((rtxContent.SelectedText.Equals("")) && (rtxContent.Equals("")))
            {
                FileMenuCut.Enabled = false;
                FileMenuCopy.Enabled = false;
                FileMenuPaste.Enabled = false;
                FileMenuDelte.Enabled = false;
            }
            else
            {
                FileMenuCut.Enabled = true;
                FileMenuCopy.Enabled = true;
                FileMenuPaste.Enabled = true;
                FileMenuDelte.Enabled = true;
            }
        }
        //复制
        private void FileMenuCopy_Click(object sender, EventArgs e)
        {
            rtxContent.Copy();
        }
        //剪切
        private void FileMenuCut_Click(object sender, EventArgs e)
        {    
            selectedInfo = rtxContent.SelectedText;
            rtxContent.Cut();
            rtxContent.SelectedText = "";
        }
        //粘贴
        private void FileMenuPaste_Click(object sender, EventArgs e)
        {
            rtxContent.Paste();
        }
        //删除
        private void FileMenuDelte_Click(object sender, EventArgs e)
        {
            rtxContent.Text = "";
        }
        //撤销
        private void FileMenuCancel_Click(object sender, EventArgs e)
        {
            rtxContent.Undo();
        }
        //选择全部
        private void FileMenuAll_Click(object sender, EventArgs e)
        {
            rtxContent.SelectAll();

        }
        //显示时间
        private void FileMenuTime_Click(object sender, EventArgs e)
        {
            rtxContent.AppendText(DateTime.Now.ToString());
        }
        //设置字体
        private void FileMenuFont_Click(object sender, EventArgs e)
        {
            if (fontDialog1.ShowDialog() == DialogResult.OK)
            {
                rtxContent.Font = fontDialog1.Font;
            }
        }
        //设置颜色
        private void FileMenuColor_Click(object sender, EventArgs e)
        {
            if ( colorDialog1.ShowDialog() == DialogResult.OK)
            {
                rtxContent.ForeColor = colorDialog1.Color;
            }
        }
        //页面设置
        private void FileMenuPage_Click(object sender, EventArgs e)
        {
            this.pageSetupDialog1.Document = this.printDocument1;
            pageSetupDialog1.ShowDialog();
        }
        //打印
        private void FileMenuDY_Click(object sender, EventArgs e)
        {
            if (rtxContent.Text.Length < 1)
            {
                MessageBox.Show("请确保要打印的文件的内容不为空！", "温馨提示");
                return;
            }
            else
            {
                // 设置Document的属性
                this.printDialog1.Document = this.printDocument1;
                this.printDialog1.PrinterSettings = this.pageSetupDialog1.PrinterSettings;
                if (this.printDialog1.ShowDialog() == DialogResult.OK)
                {
                    try
                    {
                        this.printDocument1.Print();
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message, "错误信息", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
        }
        //设置换行
        private void FileMenuBr_Click_1(object sender, EventArgs e)
        {
            if (FileMenuBr.Checked)
            {
                rtxContent.WordWrap = true;
            }
            else
            {
                rtxContent.WordWrap = false;
            }
        }
        //状态栏是否选择
        private void FileMenuState_Click(object sender, EventArgs e)
        {
            statusStrip1.Visible = FileMenuState.Checked;
        }
        //多窗体水平显示
        private void FileMenuH_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.TileHorizontal);
        }
        //多窗体垂直显示
        private void FileMenuV_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.TileVertical);
        }
        //多窗体层叠显示
        private void FileMenuC_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.Cascade);
        }        
        //帮助
        private void FileMenuHelp_Click(object sender, EventArgs e)
        {
            Form2 f2=new Form2();
            f2.Show();
        }
        //根据文本变化而状态变化
        private void rtxContent_TextChanged(object sender, EventArgs e)
        {
            this.total.Text = "当前计数" + this.rtxContent.Text.Length.ToString();
        }

    }

运行结果：

1，打开文件

2，设置字体大小-》查看帮助-》保存成功（查看帮助是另外打开的）

4，状态栏变化