发送带有存储在数据库中的多个附件的电子邮件(ASP.NET C#)

我希望发送包含多个简历的电子邮件.每个学生都有一个配置文件,其中附有简历(一些学生有多个简历),并将这些简历存储在数据库中.用户搜索符合特定条件的学生,然后将学生的简历通过电子邮件发送给潜在的雇主.

数据库：

cvID - int
UserName - varchar(50)
FileName - varchar(50)
FileType - nvarchar(50)
Data - varbinary(MAX)

进行搜索时,合适的学生会在结果中显示每个带有可用简历的下拉框.用户从希望附加到电子邮件的下拉列表框中选择“继续”,单击“附加”,然后将FileName添加到电子邮件区域的ListBox中.

用户选择了希望附加的所有简历后,便填写剩余的电子邮件字段…收件人,发件人,主题,消息等.当用户单击“发送”时,我需要代码以附加附件中列出的文件.从数据库ListBox并发送电子邮件.

ASPX.CS页面
使用System.Net.Mail

protected void emlSend_Click(object sender, EventArgs e)
{
    MailMessage email = new MailMessage();

    email.From = new MailAddress(txtFrom.Text);
    email.To.Add(txtTo.Text);
    email.Subject = txtSub.Text;
    email.Body = txtMsg.Text;

    //Loop through lstFiles to get all values
    foreach (ListItem item in lstFiles.Items)
    {
        if (item.Selected)
        {
            //Save value to string
            string lstItem = item.Text;
            string lstValue = item.Value;

            //Connect to Server
            string constr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    //Use value in Select statement
                    cmd.CommandText = "SELECT FileName, FileType, Data from CVData where cvID = '" + lstValue + "'";
                    cmd.Connection = con;
                    con.Open();
                    using (SqlDataReader sdr = cmd.ExecuteReader())
                    {
                        //Get CV Data
                        sdr.Read();
                        bytes = (byte[])sdr["Data"];
                        fileName = sdr["FileName"].ToString();

                        //Attach Data as Email Attachment
                        email.Attachments.Add(... //This is where I am now stuck

                    }
                    con.Close();
                }
            }
        }
}

使用以下内容…

email.Attachments.Add(new Attachment(new MemoryStream(bytes, fileName)));

给我这个错误：

编译器错误消息：CS1502：最佳重载方法匹配’System.IO.MemoryStream.MemoryStream(byte [],bool)’有一些无效的参数

如果我尝试这种错误方式,请告诉我.这是我第一次尝试做这样的事情,所以任何帮助将不胜感激！

解决方法:

您需要使用System.Net.Mail命名空间.
System.Web.Mail.MailMessage已过时.

这是您向MailMessage添加附件的方式.

// assumption is that the dropdown values contain a key to the file
// contents (resume) in the DB and the contents are retrieved as a 
// byte array.

if (lstFiles != null)
{
 foreach (var fileName in lstFiles)
 {
  int cvId = 42; // can come from dropdown etc. basically a key to the file.
  byte[] resumeBytes = GetResumeFromDatabaseAsBytes(cvId);
  email.Attachments.Add(new Attachment(new MemoryStream(resumeBytes, fileName)));
 }
}

public static byte[] GetResumeFromDatabaseAsBytes(int cvID)
{
 var connectionString = "YOUR_CONNECTION_STRING";

 using (var sqlConnection = new SqlConnection(connectionString))
 {
     using (var sqlCommand = new SqlCommand("SELECT TOP 1 FileName, FileType, Data From  RESUME_TABLE_NAME Where cvID = " + cvID, sqlConnection))
    {
        using (var reader = sqlCommand.ExecuteReader())
        {
            if (reader.Read())
            {
                // e.g. John_Doe.docx
                string fileName = reader["FileName"].ToString() + "." + reader["FileType"].ToString();
                byte[] cvData = (byte[])reader["Data"];

                //return cvData;
            }
        }
    }
 }
}

以上只是获取简历内容的示例.您可以通过传递正确的参数在一次通话中获得所有简历.让我们知道您正在使用的数据访问方法.

标签：email-attachments,email,asp-net,c
来源： https://codeday.me/bug/20191121/2055452.html