//加入的拖拽属性失败，dropenter声明方法待查。
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.IO;
namespace 实验2_文本编辑器
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//------------------
//-----------------
private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog(); ofd.Title = "打开文件";
ofd.Filter = "文本文件(*.txt)|*.txt"; ofd.ShowDialog();
String fileName = ofd.FileName; if (File.Exists(fileName))
{
FileStream fs = new FileStream(fileName, FileMode.Open);
StreamReader sr = new StreamReader(fs, Encoding.Default);
richTextBox1.Text = sr.ReadToEnd();
sr.Close();
fs.Close();
}
}
private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)
{
SaveFileDialog sfd = new SaveFileDialog(); sfd.Title = "保存文件";
sfd.Filter = "文本文件(*.txt)|*.txt"; sfd.ShowDialog();
String fileName = sfd.FileName; if (File.Exists(fileName))
{
DialogResult result = MessageBox.Show("文件已存在，是否覆盖", "", MessageBoxButtons.YesNo, MessageBoxIcon.Question); if (result == DialogResult.Yes)
{
FileStream fs = new FileStream(fileName, FileMode.Create); StreamWriter sw = new StreamWriter(fs, Encoding.Default); sw.WriteLine(richTextBox1.Text); sw.Close(); fs.Close();
}
}
else
{
FileStream fs = new FileStream(fileName, FileMode.Create);
StreamWriter sw = new StreamWriter(fs, Encoding.Default);
sw.WriteLine(richTextBox1.Text);
sw.Close();
fs.Close();
}
}
private void richTextBox1_TextChanged(object sender, EventArgs e)
{
}
//----------------
private void richTextBox1_DragEnter(object sender, EventArgs e)
{
if (((DragEventArgs)e).Data.GetDataPresent(DataFormats.FileDrop))
{
((DragEventArgs)e).Effect = DragDropEffects.Link;
this.richTextBox1.Cursor = System.Windows.Forms.Cursors.Arrow; //指定鼠标形状（更好看）
}
else
{
((DragEventArgs)e).Effect = DragDropEffects.None;
}
}
private void textBox1_DragDrop(object sender, DragEventArgs e)
{
//GetValue(0) 为第1个文件全路径
//DataFormats 数据的格式，下有多个静态属性都为string型，除FileDrop格式外还有Bitmap,Text,WaveAudio等格式
string path = ((System.Array)e.Data.GetData(DataFormats.FileDrop)).GetValue(0).ToString();
richTextBox1.Text = path;
this.richTextBox1.Cursor = System.Windows.Forms.Cursors.IBeam; //还原鼠标形状
}
//----------------
}
}
