如何在C#中打开文件 [英] How to open a file in C#

问题描述

大家好，

我喜欢打开一个文件.打开选项应显示在单独的窗口中.我的代码工作正常，但打开的窗口未显示以打开文件.谁能帮我解决这个问题.这是代码:

Hi All,

I like to open a file. The open option should be shown in a separate window. My code works fine but the open window is not displaying to open a file. Can anyone help me to solve this problem. Here is the code:

private void OpenMyFile()
    {
        string path = GetPath() + ViewState["fileopen"];
        FileInfo file = new FileInfo(ViewState["fileopen"].ToString());
        SqlConnection con = new SqlConnection(@"server=servername;database=DBNAME;uid=ID;pwd=PWD;max pool size=250;Connect Timeout=0");
        con.Open();
        cmd = new SqlCommand("select * from filetypemaster where extension=''" + file.Extension + "''", con);
        myReader = cmd.ExecuteReader();
        
        
        if (myReader.Read())
        {
            Response.ContentType =(String)myReader["CONTENT_TYPE"];
            myReader.Close();
        }
        else
        {
            myReader.Close();
            Message("Cannot open selected file");
            return;
        }
       
        Response.WriteFile(path);
        Response.End();
        
        con.Close();
    }

;

在此先感谢.

;

Thanks in Advance.

推荐答案

您缺少标题.

You are missing header.

Response.ContentType = "image/jpeg";
Response.AppendHeader("Content-Disposition","attachment; filename=SailBig.jpg");
Response.TransmitFile( Server.MapPath("~/images/sailbig.jpg") );
Response.End();

参考: http://www.west-wind.com/weblog/posts/2007/May/21/Downloading-a-File-with-a-Save-As-Dialog-in-ASPNET [ ^ ]

Ref:http://www.west-wind.com/weblog/posts/2007/May/21/Downloading-a-File-with-a-Save-As-Dialog-in-ASPNET[^]

也许您应该尝试类似的方法，进入目录，获取所有文件.然后过滤掉fileInfos列表以匹配您的扩展名.然后，您有一个List< fileinfo>具有扩展名类型的所有文件.那你就可以做你开放的事情.

或

您可能要查看Windows窗体中的OpenFileDialog工具箱项

Maybe you should try something like, looking into the directory, get all the files. Then filter out that list of fileInfos to match your extension. Then you have a List<fileinfo> of all the files with your extension type. Then you can do your open thing.

or

you might want to look into the OpenFileDialog toolbox item in windows Forms

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