如何下载/打开我通过服务器路径检索的文件

本文关键字：服务器 路径 检索 文件 何下载 下载 | 更新日期: 2023-09-27 18:00:55

我正在制作一个模块，显示存储在驱动器文件夹中的文档的树状视图。它恢复得很好。但问题是，这些文档的格式不同，比如(.pdf、.docx等(。单击时不会在浏览器中打开。显示404.4错误。告诉我如何通过点击按钮下载/打开不同格式的文件？以下是我的代码：

   protected void Page_Load(System.Object sender, System.EventArgs e)
    {
        try
        {
            if (!Page.IsPostBack)
            {
                if (Settings["DirectoryPath"] != null)
                {
                    BindDirectory(Settings["DirectoryPath"].ToString());
                }
                else
                {
                    BindDirectory(Server.MapPath("~/"));
                }
            }
        }
        catch (DirectoryNotFoundException DNEx)
        {
            try
            {
                System.IO.Directory.CreateDirectory("XIBDir");
                BindDirectory(Server.MapPath("XIBDir"));
            }
            catch (AccessViolationException AVEx)
            {
                Response.Write("<!--" + AVEx.Message + "-->");
            }
        }
        catch (Exception exc) //Module failed to load
        {
            Exceptions.ProcessModuleLoadException(this, exc);
        }
    }
    #endregion
    #region Optional Interfaces
    /// -----------------------------------------------------------------------------
    /// <summary>
    /// Registers the module actions required for interfacing with the portal framework
    /// </summary>
    /// <value></value>
    /// <returns></returns>
    /// <remarks></remarks>
    /// <history>
    /// </history>
    /// -----------------------------------------------------------------------------
    public ModuleActionCollection ModuleActions
    {
        get
        {
            ModuleActionCollection Actions = new ModuleActionCollection();
            Actions.Add(this.GetNextActionID(), Localization.GetString(ModuleActionType.AddContent, this.LocalResourceFile), ModuleActionType.AddContent, "", "", this.EditUrl(), false, SecurityAccessLevel.Edit, true, false);
            return Actions;
        }
    }
    #endregion
    private void BindDirectory(string Path)
    {
        try
        {
            System.IO.DirectoryInfo dirRoot = new System.IO.DirectoryInfo(Path);
            TreeNode tnRoot = new TreeNode(Path);
            tvDirectory.Nodes.Add(tnRoot);
            BindSubDirectory(dirRoot, tnRoot);
            tvDirectory.CollapseAll();
        }
        catch (UnauthorizedAccessException Ex)
        {
            TreeNode tnRoot = new TreeNode("Access Denied");
            tvDirectory.Nodes.Add(tnRoot);
        }
    }
    private void BindSubDirectory(System.IO.DirectoryInfo dirParent, TreeNode tnParent)
    {
        try
        {
            foreach (System.IO.DirectoryInfo dirChild in dirParent.GetDirectories())
            {
                //TreeNode tnChild = new TreeNode(dirChild.Name);
                TreeNode tnChild = new TreeNode(dirChild.Name, dirChild.FullName);
                tnParent.ChildNodes.Add(tnChild);
                BindSubDirectory(dirChild, tnChild);
            }
        }
        catch (UnauthorizedAccessException Ex)
        {
            TreeNode tnChild = new TreeNode("Access Denied");
            tnParent.ChildNodes.Add(tnChild);
        }
    }

    private void BindFiles(string Path)
    {
        try
        {
            tvFile.Nodes.Clear();
            System.IO.DirectoryInfo dirFile = new System.IO.DirectoryInfo(Path);
            foreach (System.IO.FileInfo fiFile in dirFile.GetFiles("*.*"))
            {
                string strFilePath = Server.MapPath(fiFile.Name);
                string strFilePaths = "~/" + fiFile.FullName.Substring(15);
                TreeNode tnFile = new TreeNode(fiFile.Name, fiFile.FullName, "", strFilePaths, "_blank");
                tvFile.Nodes.Add(tnFile);
            }
        }
        catch (Exception Ex)
        {
            Response.Write("<!--" + Ex.Message + "-->");
        }
    }
    protected void tvDirectory_SelectedNodeChanged(object sender, EventArgs e)
    {
        try
        {
            string strFilePath = tvDirectory.SelectedNode.Value;
            BindFiles(tvDirectory.SelectedNode.Value);
        }
        catch (Exception Ex)
        {
            Response.Write("<!--" + Ex.Message + "-->");
        }
    }
}

}

如何下载/打开我通过服务器路径检索的文件

404.4意味着web服务器(可能是IIS(现在不知道如何为文件提供服务(基于扩展名(。如果您的代码正确地为其他文件提供服务，则这是web服务器配置问题。查看服务器文档，为不起作用的文件扩展名添加适当的处理程序。

我会在树视图中使用一个超链接来打开链接：openfile.ashx？path=[insertpathhere](确保您的链接在target="_blank"中打开(

在通用处理程序(ASHX(中，您有权从磁盘加载文件，并将其字节流式传输到responseStream中。并且这将导致该文件在浏览器处下载。您还应该在适用的情况下设置内容类型。

请求的代码示例。。。

前言：这里有一些"额外"的事情在发生。。。我对示例中的路径进行了base64编码，因为我不希望路径是"可读的"。此外，当我把它交给浏览器时，我正在预先挂起"导出-"加上时间戳。。。但你明白了。。。

public class getfile : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        var targetId = context.Request.QueryString["target"];
        if (string.IsNullOrWhiteSpace(targetId))
        {
            context.Response.ContentType = "text/plain";
            context.Response.Write("Fail: Target was expected in querystring.");
            return;
        }
        try
        {
            var url = new String(Encoding.UTF8.GetChars(Convert.FromBase64String(targetId)));
            var filename = url.Substring(url.LastIndexOf('''') + 1);
            filename = "export-" + DateTime.Now.ToString("yyyy-MM-dd-HHmm") + filename.Substring(filename.Length - 4);
            context.Response.ContentType = "application/octet-stream";
            context.Response.AppendHeader("Content-Disposition", String.Format("attachment;filename={0}", filename));
            var data = File.ReadAllBytes(url);
            File.Delete(url);
            context.Response.BinaryWrite(data);
        }
        catch (Exception ex)
        {
            context.Response.Clear();
            context.Response.Write("Error occurred: " + ex.Message);
            context.Response.ContentType = "text/plain";
            context.Response.End();
        }
    }
    public bool IsReusable { get { return false; } }
}
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