简单实现winform编辑器

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.IO;

namespace winformDemo
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
   //让textBox2隐藏
   this.textBox2.Visible = false;
   //让dataGridView1表中的最后一行空值隐藏掉
   this.dataGridView1.AllowUserToAddRows = false;
  }
  SqlConnection con = new SqlConnection();
  SqlCommand com = new SqlCommand();
  OpenFileDialog open = new OpenFileDialog();
  /// <summary>
  /// 行
  /// </summary>
  string ClickRow = "";
  /// <summary>
  /// 列
  /// </summary>
  string ClickCells = "";
  /// <summary>
  /// 行和列相加的字符串
  /// </summary>

  string SqlLanding = "server=.;uid=sa;pwd=123456789;database=myfirstDemo";
  private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
  {
   //获取正在点击的行和列。
   ClickRow = this.dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
   ClickCells = this.dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();
  }

  private void Form1_Load(object sender, EventArgs e)
  {
   SelectInfo();
  }
  public void SelectInfo()
  {
   //断开式链接查看数据库数据
   con.ConnectionString = SqlLanding;
   com.CommandText = "select Name as 文件名,TxtLuJing as 文件路径 from TxtBianJiQi";
   com.Connection = con;
   DataSet ds = new DataSet();
   SqlDataAdapter sda = new SqlDataAdapter(com);
   sda.Fill(ds);
   this.dataGridView1.DataSource = ds.Tables[0];
  }
  private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
  {
   string Filepath = ClickCells + ClickRow;
   this.textBox2.Visible = true;
   try
   {
    //只读流；
    FileStream fss = new FileStream(Filepath, FileMode.OpenOrCreate, FileAccess.Read);
    StreamReader sww = new StreamReader(fss, Encoding.Default);
    textBox2.Text = sww.ReadToEnd();
    sww.Close();
    fss.Close();
   }
   catch (Exception ex)
   {
    //如果没有选择路径提示出一句话；
    MessageBox.Show("查看路径错误：" + ex.Message);
   }
  }

  private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)
  {
   string Filepath = ClickCells + ClickRow;
   try
   {
    //只写流；
    FileStream fss = new FileStream(Filepath, FileMode.Create, FileAccess.Write);
    StreamWriter sww = new StreamWriter(fss, Encoding.Default);
    sww.Write(textBox2.Text);
    sww.Close();
    fss.Close();
    MessageBox.Show("保存成功！");
   }
   catch (Exception ex)
   {
    //如果没有选择路径提示出一句话；
    MessageBox.Show("保存路径错误：" + ex.Message);
   }
   this.textBox2.Visible = false;
  }

  private void 新建ToolStripMenuItem_Click(object sender, EventArgs e)
  {
   this.textBox2.Text = "";
   string localFilePath = "";
   string fileNameExt = "";
   string flie = "";
   SaveFileDialog saveFileDialog = new SaveFileDialog();
   //打开默认的文件目录
   saveFileDialog.InitialDirectory = "D:\\Text\";
   //文件后缀名
   saveFileDialog.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";
   saveFileDialog.FilterIndex = 2;
   string LuJing = saveFileDialog.InitialDirectory;
   if (saveFileDialog.ShowDialog() == DialogResult.OK)
   {
    flie = saveFileDialog.FileName;
    //文件目录名
    localFilePath = saveFileDialog.FileName.ToString();
    //截取文件名字
    fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("\") + 1);
   }
   string sql = "select name from TxtBianJiQi";
   SqlCommand co = new SqlCommand(sql, con);
   SqlDataAdapter da = new SqlDataAdapter(co);
   DataSet dss = new DataSet();
   da.Fill(dss);
   //循环判断传入的表中name
   for (int i = 0; i < dss.Tables[0].Rows.Count; i++)
   {
    //定一个变量去接获取出来name
    string ss = dss.Tables[0].Rows[i][0].ToString();
    //判断对话框里输入的值是否与查出来的name相同
    if (fileNameExt == ss)
    {
     MessageBox.Show("文件已更改！");
     return;
    }
   }
   try
   {
    //只写流
    FileStream fs = new FileStream(flie, FileMode.Create, FileAccess.Write);
    StreamWriter sw = new StreamWriter(fs, Encoding.Default);//对话框另存为。
    sw.Write(textBox2.Text);
    sw.Flush();
    fs.Close();
    con.ConnectionString = SqlLanding;
    //往数据库添加 文件名和路径名 sql语句
    com.CommandText = String.Format("insert into TxtBianJiQi(Name,TxtLuJing)values('{0}','{1}')", fileNameExt, LuJing);
    com.Connection = con;
    con.Open();
    int insertInto = Convert.ToInt32(com.ExecuteScalar());
    if (insertInto > 0)
    {
     MessageBox.Show("操作失败！请重试。");
    }
    else
    {
     MessageBox.Show("添加成功！");
     this.textBox2.Visible = false;
    }
   }
   catch (Exception ex)
   {
    MessageBox.Show("添加日志失败：" + ex.Message);
   }
   con.Close();
   SelectInfo();
  }

  private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
  {
   con.ConnectionString = SqlLanding;
   //从数据库删除正在点击的文件名
   com.CommandText = String.Format("delete from TxtBianJiQi where Name='{0}'", ClickRow);
   com.Connection = con;
   con.Open();
   DialogResult dr = MessageBox.Show("确认删除？", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
   if (dr == DialogResult.OK)
   {
    int insertInto = Convert.ToInt32(com.ExecuteScalar());
    if (insertInto > 0)
    {
     MessageBox.Show("操作失误！！");
    }
    else
    {
     //File.Delete(ClickCells + ClickRow);删除Windows里的文件，括号里是要删除文档的路径。
     File.Delete(ClickCells + ClickRow);
     MessageBox.Show("删除成功！");
    }
   }
   con.Close();
   SelectInfo();
  }

  private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
  {
   this.Close();
  }

 }
}