private void button1_Click(object sender, EventArgs e)
        {
            //显示颜色选择器
            colorDialog1.ShowDialog();

            //把取到的颜色赋值给panel
            panel1.BackColor = colorDialog1.Color;
            
        }

        private void button3_Click(object sender, EventArgs e)
        {
            //显示字体样式选择器
            fontDialog1.ShowDialog();

            //取值
            label2.Font = fontDialog1.Font;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //显示文件夹选择器
            folderBrowserDialog1.ShowDialog();

            //取文件路径
            label1.Text = folderBrowserDialog1.SelectedPath;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            //设置能够打开什么类型的文件
            openFileDialog1.Filter = "文本文件|*.txt|所有文件|*.*";

            //显示 DialogResult:获取或设置窗体的对话框结果
            DialogResult dr = openFileDialog1.ShowDialog();

            //取值
            if (dr == DialogResult.OK)//为了防止用户不选择
            {
                label3.Text = openFileDialog1.FileName;
            }
        }

        private void button5_Click(object sender, EventArgs e)
        {
            //显示
            DialogResult dr = saveFileDialog1.ShowDialog();

            //取值
            if (dr == DialogResult.OK)
            {
                label4.Text = saveFileDialog1.FileName;
            }

        }

        private void button1_Click(object sender, EventArgs e)
        {
            //显示工具
            DialogResult dr = openFileDialog1.ShowDialog();

            //取值
            if (dr == DialogResult.OK)
            {
                //文件路径
                string path = openFileDialog1.FileName;

                //造文件流
                FileStream fs = new FileStream(path,FileMode.Open);

                //造一个二进制数组，用来存储读到的数据
                byte[] sj = new byte[fs.Length];

                //将文件读取为二进制数据，放到二进制数组里面
                fs.Read(sj,0,sj.Length);

                //将二进制数据转为字符串 Encoding格式转换 Default自动获取当前程序的编码方式 Getstring返回字符串
                richTextBox1.Text = Encoding.Default.GetString(sj);

                //关闭流
                fs.Close();
            }
            
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //显示选择文件对话框
            DialogResult dr = saveFileDialog1.ShowDialog();

            //取路径
            if (dr == DialogResult.OK)
            {
                //文件路径
                string path = saveFileDialog1.FileName;

                //取出文本框中的内容
                string nr = richTextBox1.Text;

                //将字符串转为二进制数组
                byte[] sj = Encoding.Default.GetBytes(nr);

                //造一个文件流
                FileStream fs = new FileStream(path,FileMode.Create);

                //向文件里面写数据
                fs.Write(sj,0,sj.Length);

                //关闭流
                fs.Close();
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            //显示选择文件对话框
            DialogResult dr = saveFileDialog1.ShowDialog();

            //取路径
            if (dr == DialogResult.OK)
            {
                //文件路径
                string path = saveFileDialog1.FileName;

                //取出文本框中的内容
                string nr = richTextBox1.Text;//造一个文件流
                FileStream fs = new FileStream(path, FileMode.Create);

                //造一个StreamWrite对象
                StreamWriter sw = new StreamWriter(fs, Encoding.Default);

                //写入文件
                sw.Write(nr);

                //关闭
                sw.Close();
                fs.Close();
            }
        }