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使用 ASP Web API，我创建了一个方法，该方法接受一个 ID，然后提供一个 pdf 文件，然后使用 Google 文档查看器或类似服务来查看文件，

代码看起来像这样，

[HttpGet]
public HttpResponseMessage GetAttachment(string id)
{
    try {
        string mapping = @"\\192.168.3.3\Archieve";
        string sourcedir = @"\Digital\";
        string filename = id + ".pdf";
        string sourceFullPath = mapping + sourcedir + filename;
        byte[] dataBytes = new byte[0];

        // connect to other network using custom credential
        var credential = new NetworkCredential("user", "pass", "192.168.3.3");
        using (new NetworkConnection(mapping, credential)) {
            dataBytes = File.ReadAllBytes(sourceFullPath);
        }

        HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK);
        response.Content = new StreamContent(new MemoryStream(dataBytes));
        response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
        response.Content.Headers.ContentDisposition.FileName = filename;
        response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");

        return response;
    }
    catch (Exception ex) {
        return Request.CreateResponse(HttpStatusCode.Gone, ex.Message);
    }
}

使用此代码，当我在网络浏览器上打开链接时，我可以下载 pdf 文件，但是当我尝试使用 Google 文档查看器显示它时，就像这样

https://docs.google.com/viewerng/viewer?url=http://myserver/webapi/api/File/GetAttachment/0317101532

谷歌未能正确显示文件，

当我使用其他服务时https://www.pdfescape.com/open/，错误是The remote server returned an error: (405) Method Not Allowed.

编辑：我认为 Google Docs viewer 和 pdfescape 都需要直接链接到文件，我可以在 Web API 控制器上生成直接链接吗？

4

1 回答 1

2

尝试将文件复制到本地，然后返回文件链接，类似这样

[HttpGet]
public IHttpActionResult GetAttachment(string id)
{
    try {
        string mapping = @"\\192.168.3.3\Archieve";
        string sourcedir = @"\Digital\";
        string filename = id + ".pdf";
        string sourceFullPath = mapping + sourcedir + filename;
        byte[] dataBytes = new byte[0];

        // connect to other network using custom credential
        var credential = new NetworkCredential("user", "pass", "192.168.3.3");
        using (new NetworkConnection(mapping, credential)) {
            dataBytes = File.ReadAllBytes(sourceFullPath);
        }

        // write file to local
        string destFullPath = string.Format("{0}/Content/Data//{2}", HttpContext.Current.Server.MapPath("~"), filename);
        File.WriteAllBytes(destFullPath, dataBytes);

        // return the file name, 
        return Ok(filename);

        // then you can view your docs using Google Viewer like this
        // https://docs.google.com/viewer?url=http://[YOUR_SERVER_BASE_URL]/content/data/[FILENAME]
    }
    catch (Exception ex) {
        return Content(HttpStatusCode.PreconditionFailed, ex.Message);
    }
}

不要忘记在“内容”文件夹上添加所需的权限

于 2018-01-09T03:44:49.037 回答