c# 记事本实现代码

DialogResult d = MessageBox.Show("文件 " + this.Text + @" 的文字已经改变。

想保存文件吗？", "MyNotePad", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Information, MessageBoxDefaultButton.Button1, MessageBoxOptions.DefaultDesktopOnly);

switch (d)
{
case DialogResult.Yes:
using (SaveFileDialog saveDig = new SaveFileDialog())
{
saveDig.Filter = @"文本文档(*.txt)|*.txt";
saveDig.FileName = "*.txt";
if (saveDig.ShowDialog() == DialogResult.OK)
{
StreamWriter sw = new StreamWriter(saveDig.FileName, false, System.Text.Encoding.Default);
sw.Write(this.textBox1.Text);
sw.Close();
this.Text = saveDig.FileName;
}
}
break;
case DialogResult.No:
this.textBox1.Text = "";
break;
case DialogResult.Cancel:
break;

default: System.Diagnostics.Debug.Assert(false);
break;

}

}
}

private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
{
if (this.textBox1.Text != "")
{

DialogResult d = MessageBox.Show("文件 " + this.Text + @" 的文字已经改变。

想保存文件吗？", "MyNotePad", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Information, MessageBoxDefaultButton.Button1, MessageBoxOptions.DefaultDesktopOnly);