C#—打开文件

一、打开图片

ps：必须先在pictureBox中导入一张图片

private void button4_Click(object sender, EventArgs e)//选择、更换图片

{

     if (openFileDialog1.ShowDialog() == DialogResult.OK)//需要工具箱的openFileDialog

     {

         Text = openFileDialog1.FileName;//选择图片

       Bitmap map = (Bitmap)Image.FromFile(openFileDialog1.FileName);

          pictureBox1.Image = map;//更换图片

             

     }       

}

二、打开txt文档

        private void button5_Click(object sender, EventArgs e)//打开txt文档，仅限英文

        {

            if (openFileDialog1.ShowDialog() == DialogResult.OK)

            {

                StreamReader sr = new StreamReader(openFileDialog1.FileName);

                string line;

                while ((line = sr.ReadLine()) != null)

                {

                    listBox3.Items.Add(line);

                }

            }

        }