C#读取文件高效方法实现

 C# Code 

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        private void button1_Click(object sender, EventArgs e)
        {
            var fileDir = this.txtFileFolder.Text.Trim();

            byte[] allBytes = null;

            byte[] buffer = new byte[1024];//一个1K的缓冲字节容器

            using (MemoryStream ms=new MemoryStream())
            {
                using (FileStream fs=new FileStream(fileDir,FileMode.Open,FileAccess.Read))
                {
                    int positon = 0;
                    while ((positon=fs.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        ms.Write(buffer, 0, positon);
                    }

                    allBytes = ms.ToArray();
                }

            }

            if (null!=allBytes)
            {
                //尝试将字节转成字符串
                var txt = System.Text.Encoding.UTF8.GetString(allBytes);
                this.richTextBox_Result.Text = txt;
            }
        }