Google Drive 将表格下载到 C# 中的 XLSX

Question

How do I download a Google Sheet as an xlsx file type?如何将 Google 表格下载为 xlsx 文件类型？

I have the below code and it works great except for the file type.我有下面的代码，除了文件类型之外它工作得很好。 It will download the file as an xlsx but if fails when I try to open it.它会将文件下载为 xlsx，但如果我尝试打开它时失败。

The error I get says "Excel cannot open the file 'file.xlsx' because the file format of file extension is not valid"我得到的错误是“Excel无法打开文件'file.xlsx'，因为文件扩展名的文件格式无效”

Thanks for the help.谢谢您的帮助。

using System;
using System.IO;
using System.Net;

public static class FileDownloader
{
    private const string GOOGLE_DRIVE_DOMAIN = "drive.google.com";
    private const string GOOGLE_DRIVE_DOMAIN2 = "https://drive.google.com";

    // Normal example: FileDownloader.DownloadFileFromURLToPath( "http://example.com/file/download/link", @"C:\file.txt" );
    // Drive example: FileDownloader.DownloadFileFromURLToPath( "http://drive.google.com/file/d/FILEID/view?usp=sharing", @"C:\file.txt" );
    public static FileInfo DownloadFileFromURLToPath( string url, string path )
    {
        if( url.StartsWith( GOOGLE_DRIVE_DOMAIN ) || url.StartsWith( GOOGLE_DRIVE_DOMAIN2 ) )
            return DownloadGoogleDriveFileFromURLToPath( url, path );
        else
            return DownloadFileFromURLToPath( url, path, null );
    }

    private static FileInfo DownloadFileFromURLToPath( string url, string path, WebClient webClient )
    {
        try
        {
            if( webClient == null )
            {
                using( webClient = new WebClient() )
                {
                    webClient.DownloadFile( url, path );
                    return new FileInfo( path );
                }
            }
            else
            {
                webClient.DownloadFile( url, path );
                return new FileInfo( path );
            }
        }
        catch( WebException )
        {
            return null;
        }
    }

    // Downloading large files from Google Drive prompts a warning screen and
    // requires manual confirmation. Consider that case and try to confirm the download automatically
    // if warning prompt occurs
    private static FileInfo DownloadGoogleDriveFileFromURLToPath( string url, string path )
    {
        // You can comment the statement below if the provided url is guaranteed to be in the following format:
        // https://drive.google.com/uc?id=FILEID&export=download
        url = GetGoogleDriveDownloadLinkFromUrl( url );

        using( CookieAwareWebClient webClient = new CookieAwareWebClient() )
        {
            FileInfo downloadedFile;

            // Sometimes Drive returns an NID cookie instead of a download_warning cookie at first attempt,
            // but works in the second attempt
            for( int i = 0; i < 2; i++ )
            {
                downloadedFile = DownloadFileFromURLToPath( url, path, webClient );
                if( downloadedFile == null )
                    return null;

                // Confirmation page is around 50KB, shouldn't be larger than 60KB
                if( downloadedFile.Length > 60000 )
                    return downloadedFile;

                // Downloaded file might be the confirmation page, check it
                string content;
                using( var reader = downloadedFile.OpenText() )
                {
                    // Confirmation page starts with <!DOCTYPE html>, which can be preceeded by a newline
                    char[] header = new char[20];
                    int readCount = reader.ReadBlock( header, 0, 20 );
                    if( readCount < 20 || !( new string( header ).Contains( "<!DOCTYPE html>" ) ) )
                        return downloadedFile;

                    content = reader.ReadToEnd();
                }

                int linkIndex = content.LastIndexOf( "href=\"/uc?" );
                if( linkIndex < 0 )
                    return downloadedFile;

                linkIndex += 6;
                int linkEnd = content.IndexOf( '"', linkIndex );
                if( linkEnd < 0 )
                    return downloadedFile;

                url = "https://drive.google.com" + content.Substring( linkIndex, linkEnd - linkIndex ).Replace( "&amp;", "&" );
            }

            downloadedFile = DownloadFileFromURLToPath( url, path, webClient );

            return downloadedFile;
        }
    }

    // Handles 3 kinds of links (they can be preceeded by https://):
    // - drive.google.com/open?id=FILEID
    // - drive.google.com/file/d/FILEID/view?usp=sharing
    // - drive.google.com/uc?id=FILEID&export=download
    public static string GetGoogleDriveDownloadLinkFromUrl( string url )
    {
        int index = url.IndexOf( "id=" );
        int closingIndex;
        if( index > 0 )
        {
            index += 3;
            closingIndex = url.IndexOf( '&', index );
            if( closingIndex < 0 )
                closingIndex = url.Length;
        }
        else
        {
            index = url.IndexOf( "file/d/" );
            if( index < 0 ) // url is not in any of the supported forms
                return string.Empty;

            index += 7;

            closingIndex = url.IndexOf( '/', index );
            if( closingIndex < 0 )
            {
                closingIndex = url.IndexOf( '?', index );
                if( closingIndex < 0 )
                    closingIndex = url.Length;
            }
        }

        return string.Format( "https://drive.google.com/uc?id={0}&export=download", url.Substring( index, closingIndex - index ) );
    }
}

// Web client used for Google Drive
public class CookieAwareWebClient : WebClient
{
    private class CookieContainer
    {
        Dictionary<string, string> _cookies;

        public string this[Uri url]
        {
            get
            {
                string cookie;
                if( _cookies.TryGetValue( url.Host, out cookie ) )
                    return cookie;

                return null;
            }
            set
            {
                _cookies[url.Host] = value;
            }
        }

        public CookieContainer()
        {
            _cookies = new Dictionary<string, string>();
        }
    }

    private CookieContainer cookies;

    public CookieAwareWebClient() : base()
    {
        cookies = new CookieContainer();
    }

    protected override WebRequest GetWebRequest( Uri address )
    {
        WebRequest request = base.GetWebRequest( address );

        if( request is HttpWebRequest )
        {
            string cookie = cookies[address];
            if( cookie != null )
                ( (HttpWebRequest) request ).Headers.Set( "cookie", cookie );
        }

        return request;
    }

    protected override WebResponse GetWebResponse( WebRequest request, IAsyncResult result )
    {
        WebResponse response = base.GetWebResponse( request, result );

        string[] cookies = response.Headers.GetValues( "Set-Cookie" );
        if( cookies != null && cookies.Length > 0 )
        {
            string cookie = "";
            foreach( string c in cookies )
                cookie += c;

            this.cookies[response.ResponseUri] = cookie;
        }

        return response;
    }

    protected override WebResponse GetWebResponse( WebRequest request )
    {
        WebResponse response = base.GetWebResponse( request );

        string[] cookies = response.Headers.GetValues( "Set-Cookie" );
        if( cookies != null && cookies.Length > 0 )
        {
            string cookie = "";
            foreach( string c in cookies )
                cookie += c;

            this.cookies[response.ResponseUri] = cookie;
        }

        return response;
    }
}

Answer 1

You should try you need to add a mimetype to your export command to tell it which format you want to download the file in. There are a few diffrent mime types supported for spreadsheets you can find them here您应该尝试在导出命令中添加一个 mimetype，以告诉它您要以哪种格式下载文件。电子表格支持一些不同的 mime 类型，您可以在此处找到它们

https://drive.google.com/uc?id={0}&export=download&mimetype=application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

As a side note you might want to consider using the Google .net client library it wont help you with your issue but its much easier to work with.作为旁注，您可能需要考虑使用 Google .net 客户端库，它不会帮助您解决问题，但使用起来更容易。

.net quick start .net 快速入门
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Google Drive 将表格下载到 C# 中的 XLSX

问题描述

1 个解决方案

解决方案1
0 已采纳 2019-09-26 06:29:17

media downloader code媒体下载器代码

Google Drive 将表格下载到 C# 中的 XLSX

问题描述

1 个解决方案

解决方案1 0 已采纳 2019-09-26 06:29:17

media downloader code媒体下载器代码

解决方案1
0 已采纳 2019-09-26 06:29:17