发送邮件时出现错误 It is being used by another process.Please 稍后在 .net 中尝试

Question

我正在创建一个文件并通过邮件发送该文件，同时发送邮件我收到这个错误，你能建议发送什么吗邮件？

请告诉我在哪里添加代码以停止发出“它是”的警告 bieng 被另一个进程使用

protected void btnMail_Click(object sender, EventArgs e) { Response.Clear();

FileStream fStream = File.Create(strPath);在这一行，它跳转到 catch 块

Response.Clear();

尝试 { if (Session["Projectname"] != null && Session["Projectname"].ToString() != string.Empty) {

    string Projname = Session["Projectname"].ToString();
    System.IO.StringWriter stringWrite = new System.IO.StringWriter();
    System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
    design.RenderControl(htmlWrite);

    string strBuilder = stringWrite.ToString();
    string strPath = Request.PhysicalApplicationPath + "\Temp\WeeklyReport of " + Projname + ".doc";

    LblNoteMsg.Text = strPath;

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

    FileStream fStream = File.Create(strPath);
    fStream.Close();
    fStream.Dispose();

    StreamWriter sWriter = new StreamWriter(strPath);
    sWriter.Write(strBuilder);
    sWriter.Close();
    sWriter.Dispose();
    Response.Clear();

    DateTime input = DateTime.Now;
    int delta = DayOfWeek.Monday - input.DayOfWeek;
    DateTime dats = DateTime.Now.AddDays(delta);
    //this week
    DateTime monday = input.AddDays(delta);
    string MonDate = monday.ToShortDateString();
    DateTime sat = monday.AddDays(5);
    string SatDate = sat.ToShortDateString();

    StreamReader r = new StreamReader(Server.MapPath("~/WeeklyMail.txt"));
    string body = r.ReadToEnd();

    MailMessage Msg = new MailMessage();
    string MailId = txtMailId.Text;

    foreach (string ss in MailId.Split(",".ToCharArray()))
        {
        if (string.IsNullOrEmpty(ss) == false)
            {
            Msg.To.Add(new MailAddress(ss));
            }
        }

    Msg.Bcc.Add(new MailAddress("support@sunlightit.com"));


    body = body.Replace("<%MonDate%>", MonDate);
    body = body.Replace("<%SatDate%>", SatDate);

    Msg.Subject = "Weekly status Report of " + Projname + "," + DateTime.Now.ToShortDateString() + "";
    Msg.Body = body;

    Msg.IsBodyHtml = true;
    Msg.Attachments.Add(new Attachment(strPath));
    SmtpClient MailServer = new SmtpClient();
    try
        {
        MailServer.Send(Msg);
        string reply = (Msg.DeliveryNotificationOptions = System.Net.Mail.DeliveryNotificationOptions.OnSuccess).ToString();

        if (reply == "OnSuccess")
            {
            txtMailId.Text = "";
            tblMail.Visible = false;
            lblMsg.ForeColor = System.Drawing.Color.Green;
            lblMsg.Text = "Mail has send succesfully";
            }
        else
            {
            lblMsg.ForeColor = System.Drawing.Color.Red;
            lblMsg.Text = "Mail delivery unsuccessfull";
            }

        }
    catch (Exception ex)
        {
        Console.WriteLine(ex);

        if (ex.InnerException != null)
            {
            Console.WriteLine("InnerException is: {0}", ex.InnerException);
            }
        }

    }
else
    {
    Response.Redirect("~/Login.aspx");
    }
}

赶上（异常） { ScriptManager.RegisterClientScriptBlock(Page, typeof(Page), "clentscript", "alert('It is being used by another process.Please Try after sometime ');", true); }

}

从这一行开始，它将捕获块 .file 未创建文件流 fStream = File.Create(strPath);

Answer 1

你检查目录了吗？ string strPath = Request.PhysicalApplicationPath + "\Temp\WeeklyReport of " + Projname + ".doc";

if(Directory.Exists("...\Temp")) {

}

Answer 2

完全猜测 - 但我怀疑你运行进入了一个维护文件锁的进程，该文件锁尚未从以前的调用中释放（即 fileStream 在第一次创建时打开，留下锁定浮动然后在随后尝试再次创建文件的调用中）

如果是我：我会更改此位以使用 File.WriteAllLines()（创建文件/覆盖现有文件，一次写入、关闭和处理所有内容）

检查：File.WriteAllLines on MSDN

祝你好运！

或

更好 - 为什么要创建文件？如果您仅使用它们来附加到邮件，为什么不将内容写入内存流并围绕该流建立附件（在您回绕它之后）。

Here's a link to the attachment CTor you'll need on MSDN

代码示例：

System.Net.Mail.Attachment attachment = null;
    using (var ms = new System.IO.MemoryStream())
    {
        using (var sw = new System.IO.StreamWriter(ms))
        {
            sw.Write("contents here");
            sw.Flush();
        }

        ms.Position = 0;

        attachment = new System.Net.Mail.Attachment(ms, "FileNameHere.txt");
    }

    var msg = new System.Net.Mail.MailMessage()
    {
        Body = "body text here",
        Subject = "some subject"
    };
    msg.Attachments.Add(attachment);

PS - 我从你的代码中注意到你在发送到任何地方后都没有删除文件 - 可能需要考虑这一点。

Answer 3

看看你的代码，你不需要调用 .dispose() 因为这是 using 块的用途，所以你可以：

using (var fStream = File.Create(strPath).Close())
            {
                 // these can go - (arguable you dont even need to do the close above, 
                 // but it's there for completeness's sake)
                 //fStream.Close();
                 //fStream.Dispose();
            }
            using(StreamWriter sWriter = new StreamWriter(strPath))
            {
                sWriter.Write(strBuilder);
                sWriter.Close();
                //sWriter.Dispose(); - this can go too
                Response.Clear();
            }

此外，您可能应该对使用 StreamReader 的位使用类似的方法。

此外 - strPath 最终会在文件系统上徘徊（这是可取的吗？）

如果您只是想确保唯一的文件名，您可以使用 Path.GetRandomFilename() (see this MSDN article)

最后，我会考虑将其中的一些（尤其是 "unique file name" 位）拉入扩展方法或可测试的辅助对象中。

HTH！

安迪

发送邮件时出现错误 It is being used by another process.Please 稍后在 .net 中尝试

while sending mail giving error It is being used by another process.Please Try after sometime in .net

c#

asp.net

smtp

smtpclient