利用ASP.Net怎么對(duì)大文件進(jìn)行下載？相信很多沒(méi)有經(jīng)驗(yàn)的人對(duì)此束手無(wú)策，為此本文總結(jié)了問(wèn)題出現(xiàn)的原因和解決方法，通過(guò)這篇文章希望你能解決這個(gè)問(wèn)題。

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當(dāng)我們的網(wǎng)站需要支持下載大文件時(shí)，如果不做控制可能會(huì)導(dǎo)致用戶(hù)在訪問(wèn)下載頁(yè)面時(shí)發(fā)生無(wú)響應(yīng)，使得瀏覽器崩潰?？梢詤⒖既缦麓a來(lái)避免這個(gè)問(wèn)題。

關(guān)于此代碼的幾點(diǎn)說(shuō)明：

1. 將數(shù)據(jù)分成較小的部分，然后將其移動(dòng)到輸出流以供下載，從而獲取這些數(shù)據(jù)。

2. 根據(jù)下載的文件類(lèi)型來(lái)指定 Response.ContentType 。（參考OSChina的這個(gè)網(wǎng)址可以找到大部分文件類(lèi)型的對(duì)照表：/tupian/20230522/html 在每次寫(xiě)完response時(shí)記得調(diào)用 Response.Flush()

4. 在循環(huán)下載的過(guò)程中使用 Response.IsClientConnected 這個(gè)判斷可以幫助程序盡早發(fā)現(xiàn)連接是否正常。若不正常，可以及早的放棄下載，以釋放所占用的服務(wù)器資源。

5. 在下載結(jié)束后，需要調(diào)用 Response.End() 來(lái)保證當(dāng)前線程可以在最后被終止掉。

復(fù)制代碼 代碼如下:

using System;

namespace WebApplication1
{
    public partial class DownloadFile : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            System.IO.Stream iStream = null;

            // Buffer to read 10K bytes in chunk:
            byte[] buffer = new Byte[10000];

            // Length of the file:
            int length;

            // Total bytes to read.
            long dataToRead;

            // Identify the file to download including its path.
            string filepath = Server.MapPath("/") +"./Files/TextFile1.txt";

            // Identify the file name.
            string filename = System.IO.Path.GetFileName(filepath);

            try
            {
                // Open the file.
                iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,
                            System.IO.FileAccess.Read, System.IO.FileShare.Read);

                // Total bytes to read.
                dataToRead = iStream.Length;

                Response.Clear();
                Response.ClearHeaders();
                Response.ClearContent();
                Response.ContentType = "text/plain"; // Set the file type
                Response.AddHeader("Content-Length", dataToRead.ToString());
                Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);

                // Read the bytes.
                while (dataToRead > 0)
                {
                    // Verify that the client is connected.
                    if (Response.IsClientConnected)
                    {
                        // Read the data in buffer.
                        length = iStream.Read(buffer, 0, 10000);

                        // Write the data to the current output stream.
                        Response.OutputStream.Write(buffer, 0, length);

                        // Flush the data to the HTML output.
                        Response.Flush();

                        buffer = new Byte[10000];
                        dataToRead = dataToRead - length;
                    }
                    else
                    {
                        // Prevent infinite loop if user disconnects
                        dataToRead = -1;
                    }
                }
            }
            catch (Exception ex)
            {
                // Trap the error, if any.
                Response.Write("Error : " + ex.Message);
            }
            finally
            {
                if (iStream != null)
                {
                    //Close the file.
                    iStream.Close();
                }

                Response.End();
            }
        }
    }
}

看完上述內(nèi)容，你們掌握利用ASP.Net怎么對(duì)大文件進(jìn)行下載的方法了嗎？如果還想學(xué)到更多技能或想了解更多相關(guān)內(nèi)容，歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道，感謝各位的閱讀！

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