分块下载，测试文件 3.8GB

最新推荐文章于 2025-05-21 09:42:11 发布

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最新推荐文章于 2025-05-21 09:42:11 发布

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原文链接：http://www.cnblogs.com/hdjjun/archive/2008/06/17/1223838.html

本文详细介绍了一种在ASP.NET中实现大文件下载的方法，通过将文件分成小块进行逐块读取和发送，有效避免了内存溢出问题，适用于各种大文件如ISO镜像的下载需求。

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protected void Page_Load(object sender, EventArgs e)
    {
        string downFilePath = @"D:\openSUSE-10.2-GM-DVD-i386.iso"; // test with 3.8GB, ok // Server.MapPath("~/files/somefile.iso");
        System.IO.FileInfo downFileInfo = new System.IO.FileInfo(downFilePath);

        if (!downFileInfo.Exists) throw new Exception("文件不存在。");
        const int CHUNK_SIZE = 10000;
        byte[] buffer = new byte[CHUNK_SIZE];

        Response.Clear();
        using (System.IO.FileStream iStream = System.IO.File.OpenRead(downFilePath)) {
            long dataLengthToRead = iStream.Length;
            Response.ContentType = "application/octet-stream";
            Response.AddHeader("Content-Disposition",
                               "attachment; filename=" + Server.UrlPathEncode(downFileInfo.Name));
            while (dataLengthToRead > 0 && Response.IsClientConnected) {
                int lengthRead = iStream.Read(buffer, 0, CHUNK_SIZE);
                Response.OutputStream.Write(buffer, 0, lengthRead);
                Response.Flush();
                dataLengthToRead = dataLengthToRead - lengthRead;
            }
        }
         }