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;               ];//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))                 {                     ;                     )                     {                         ms.Write(buffer, , 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;             }         }