using System.IO;

private void button1_Click(object sender, EventArgs e)        {            string strFilePath = "";            OpenFileDialog fd = new OpenFileDialog();            fd.Filter = "文本文件(*.txt)|*.txt|All files (*.*)|*.*"; //过滤文件类型            //fd.InitialDirectory = Application.StartupPath + "\\Temp\\";//设定初始文件夹            //fd.ShowReadOnly = true; //设定文件是否仅仅读            if (fd.ShowDialog() != DialogResult.OK)            {                return;            }            strFilePath = fd.FileName;            if (!File.Exists(strFilePath))            {                MessageBox.Show("抱歉。文件不存在。请又一次输入文件名称！

"); return; } StreamReader strReader = new StreamReader(new FileStream(strFilePath, FileMode.Open, FileAccess.ReadWrite), Encoding.Default); //string strTemp = strReader.ReadLine(); string strTemp = strReader.ReadToEnd(); strReader.Close(); textBox1.Text = strTemp; }