Question

我生成一个PDF文件，将其保存在服务器上：

var bytes = ms.ToArray();
. . .
String fileFullpath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), pdfFileName);
. . .
File.WriteAllBytes(fileFullpath, bytes);

...然后将其保存到Sharepoint文档库中，并将其作为电子邮件附件发送给生成该文件的人员：

SavePDFToDocumentLibrary(fileFullpath);
String from = GetFromEmailID();
String to = GetUserEmail();
String subjLine = String.Format("The PDF file you generated ({0})", pdfFileName);
String body = String.Format("The Direct Pay PDF file you generated ({0}) is attached.", pdfFileName);
SendEmailWithAttachment(fileFullpath, from, to, subjLine, body);
// Now that it has been put in a Document Library and emailed, delete the file that was saved locally
File.Delete(fileFullpath);

...此时，我不再需要在服务器上保存到磁盘的文件，因此，如上一行所示，尝试删除它。

但是，它不起作用。现在冗余的文件仍在保存的位置。

为什么，以及如何让它理解＆＃34;删除＆＃34;真的意味着＆＃34;删除＆＃34;？

更新

以下是Scott希望看到的方法：

// This works; got it from Henry Zucchini's answer at http://stackoverflow.com/questions/468469/how-do-you-upload-a-file-to-a-document-library-in-sharepoint
private void SavePDFToDocumentLibrary(String fullpath)
{
    String fileToUpload = fullpath;
    String sharePointSite = siteUrl;
    String documentLibraryName = "DirectPayPDFForms";

    using (SPSite oSite = new SPSite(sharePointSite))
    {
        using (SPWeb oWeb = oSite.OpenWeb())
        {
            if (!System.IO.File.Exists(fileToUpload))
                throw new FileNotFoundException("File not found.", fileToUpload);

            SPFolder doclib = oWeb.Folders[documentLibraryName];

            // Prepare to upload
            Boolean replaceExistingFiles = true;
            String fileName = System.IO.Path.GetFileName(fileToUpload);
            FileStream fileStream = File.OpenRead(fileToUpload);

            // Upload document
            SPFile spfile = doclib.Files.Add(fileName, fileStream, replaceExistingFiles);

            // Commit 
            doclib.Update();
        }
    }
}

// This is adapted from https://msdn.microsoft.com/en-us/library/system.net.mail.mailmessage(v=vs.90).aspx
public static void SendEmailWithAttachment(string fileToMail, String from, String to, String subj, String body)
{
    String server = GetSMTPHostName(); //"468802-DEV-SPWF"; // change this to prod when go live, or programatically assign?
    // Specify the file to be attached and sent. 
    string file = fileToMail;
    // Create a message and set up the recipients.
    MailMessage message = new MailMessage(
       from,
       to,
       subj,
       body);

    // Create  the file attachment for this e-mail message.
    Attachment data = new Attachment(file, MediaTypeNames.Application.Octet);
    // Add time stamp information for the file.
    ContentDisposition disposition = data.ContentDisposition;
    disposition.CreationDate = System.IO.File.GetCreationTime(file);
    disposition.ModificationDate = System.IO.File.GetLastWriteTime(file);
    disposition.ReadDate = System.IO.File.GetLastAccessTime(file);
    // Add the file attachment to this e-mail message.
    message.Attachments.Add(data);

    //Send the message.
    SmtpClient client = new SmtpClient(server);
    // Add credentials if the SMTP server requires them.
    client.Credentials = CredentialCache.DefaultNetworkCredentials;

    try
    {
        client.Send(message);
    }
    catch (Exception ex)
    {
        Console.WriteLine("Exception caught in CreateMessageWithAttachment(): {0}", ex.ToString());
    }
    // Display the values in the ContentDisposition for the attachment.
    // May not need/want this section
    ContentDisposition cd = data.ContentDisposition;
    Console.WriteLine("Content disposition");
    Console.WriteLine(cd.ToString());
    Console.WriteLine("File {0}", cd.FileName);
    Console.WriteLine("Size {0}", cd.Size);
    Console.WriteLine("Creation {0}", cd.CreationDate);
    Console.WriteLine("Modification {0}", cd.ModificationDate);
    Console.WriteLine("Read {0}", cd.ReadDate);
    Console.WriteLine("Inline {0}", cd.Inline);
    Console.WriteLine("Parameters: {0}", cd.Parameters.Count);
    foreach (DictionaryEntry d in cd.Parameters)
    {
        Console.WriteLine("{0} = {1}", d.Key, d.Value);
    }
    // </ May not need/want this section
    data.Dispose();
}

更新2

在添加此测试后，我看到在单步执行时：

if (File.Exists(fileFullpath))
{
    File.Delete(fileFullpath);
}

......毕竟是一个异常，在IOException catch块中：

该进程无法访问该文件＆＃39; C：\ Users \ TEMP.SP.018 \ Desktop \ DirectPayDynamic_2015Jul28_19_02_clayshan_0.pdf＆＃39;因为它正被另一个进程使用。

那么其他方法之一如何保留呢？ ISTM表示SavePDFToDocumentLibrary（）是安全的，因为它使用了块。

是data.Dispose（）;在SendEmailWithAttachment（）还不够？我需要明确地在那里打电话，或者什么？

更新3

我添加了＆＃34; message.Dispose（）;＆＃34;就在＆＃34; data.Dispose（）;＆＃34;之前在SendEmailWithAttachment（）中，但它没有任何区别。

Answer 1

Try disposing the file stream used in SavePDFToDocumentLibrary like so:

using (FileStream fileStream = File.OpenRead(fileToUpload))
{
    ...
}

如何让File.Delete（）实际删除我的文件？

更新

更新2

更新3

1 个答案: