System.OutOfMemoryException ,简化代码如下，有没有解决办法？

Question

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
byte[] bytes = File.ReadAllBytes("D:\toClient.xls");//toClient.xls 大小为20M
Response.BinaryWrite(bytes);
}
}

运行后直接报：System.OutOfMemoryException 

Answer 1

一般是这么写：Response.Clear();Response.ContentType = "application/octet-stream";Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(downloadName, System.Text.Encoding.UTF8));Response.WriteFile("D:\toClient.xls");Response.Flush();Response.End();

Answer 2

不要直接Response.BinaryWrite(bytes);每次读取一个  byte[]然后Response.Flush();