发送错误邮件时，另一个进程正在使用该邮件。请稍后在。NET中尝试

Question

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我正在创建一个文件并通过邮件发送该文件，当发送邮件时，我得到了这个错误，你能建议发送什么邮件吗？

请告诉我在哪里添加代码以防止出现“它是由另一个进程bieng userd”的警告

受保护的void btnMail_Click(object sender,EventArgs e）{response.clear（）；

FileStream fStream=file.create（strPath）；在这条线上，它跳着接住块

    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("[e-mail]"));


    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");
    }
}

从这一行开始，它将执行catch block.file不是creating FileStream fStream=file.create（strPath）；

Answer 1

查看您的代码，您不需要执行对.dispose（）的调用，因为这是using块的用途，所以您可以：

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，您可能应该使用与使用StreamReader类似的方法。

另外-strPath最终会挂在文件系统上（这是可取的吗？）