如何以编程方式从Sharepoint文档库下载文件

Question

在单击按钮事件或单击“链接”按钮时，我想从sharepoint文档库下载文档并将其保存到用户的本地磁盘。

请帮助我，如果您有任何代码示例，请分享

Answer 1

输出文件的直接链接的问题是，对于某些内容类型，它可能只是在浏览器窗口中打开。如果这不是所需的结果，并且您想要强制保存文件对话框，则需要编写一个 ASP/PHP 页面，您可以通过查询字符串向该页面传递文件名。然后，该页面可以读取该文件并在响应上设置一些标头以指示内容处置是附件。

对于 ASP.net，如果您创建一个名为 download.aspx 的简单 aspx 页面，请在其中添加以下代码，然后将此文件放在服务器上的某个位置，您可以通过调用此页面来下载文件，如下所示：

http://yourserveraddress/download.aspx?path=http://yoursharepointserver/pathtodoclibrary/file.ext

protected void Page_Load(object sender, EventArgs e)
    {
        string path = "";
        string fileName = "";

        path = Request.QueryString["path"];
        if (path != null && path.Length > 0)
        {
            int lastIndex = path.LastIndexOf("/");
            fileName = path.Substring(lastIndex + 1, (path.Length - lastIndex - 1));

            byte[] data;
            data = GetDataFromURL(path);

            Response.Clear();
            Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName);
            Response.BinaryWrite(data);
            Response.Flush();
        }
    }


    protected byte[] GetDataFromURL(string url)
    {
        WebRequest request = WebRequest.Create(url);
        byte[] result;
        byte[] buffer = new byte[4096];

        //uncomment this line if you need to be authenticated to get to the files on SP
        //request.Credentials = new NetworkCredential("username", "password", "domain");

        using (WebResponse response = request.GetResponse())
        {
            using (Stream responseStream = response.GetResponseStream())
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    int count = 0;
                    do
                    {
                        count = responseStream.Read(buffer, 0, buffer.Length);
                        ms.Write(buffer, 0, count);
                    } while (count != 0);
                    result = ms.ToArray();
                }
            }
        }
        return result;
    }