我是一名新的 ASP.NET 开发人员，我正在开发一个培训管理系统，该系统将每周向我部门的员工发送电子邮件通知，以参加每周一次的短期培训测验。一切正常。对于发送电子邮件通知，我当然使用的是 C# Mail 功能。该电子邮件是基于文本的电子邮件，每周都会包含指向新测验的链接。
现在，我想将此基于文本的电子邮件作为基于图像的电子邮件。该图像中有一个特定部分将作为新测验的链接。所以每周都会在图片的那部分下有一个新的链接。我在这部分苦苦挣扎，我不知道如何修改我的 C# Mail 函数来处理它。这是我第一次使用C# Mail function. 我在谷歌上搜索了很多，我很困惑。仅供参考，我设计了我的邮件功能来处理将相同的电子邮件发送给 200 多个用户，方法是将它们分成 10 个用户的列表，如下所示。
您能帮我修改下面显示的代码以处理发送该图像吗？让我们假设我们有任何图像。
C#代码：
protected void Page_Load(object sender, EventArgs e)
{
Send();
}
protected void SendEmail(string toAddresses, string fromAddress, string MailSubject, string MessageBody, bool isBodyHtml)
{
SmtpClient sc = new SmtpClient("Mail Server");
try
{
MailMessage msg = new MailMessage();
msg.From = new MailAddress("Test@MailServer.com", "TestSystem");
msg.Bcc.Add(toAddresses);
msg.Subject = MailSubject;
msg.Body = MessageBody;
msg.IsBodyHtml = isBodyHtml;
sc.Send(msg);
}
catch (Exception ex)
{
throw ex;
}
}
protected void SendEmailTOAllUser()
{
string connString = "Data Source=localhost;Initial Catalog=TestDB;Integrated Security=True";
using (SqlConnection conn = new SqlConnection(connString))
{
var sbEmailAddresses = new System.Text.StringBuilder(2000);
string quizid = "";
// Open DB connection.
conn.Open();
string cmdText = "SELECT MIN (QuizID) As mQuizID FROM dbo.QUIZ WHERE IsSent <> 1";
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
SqlDataReader reader = cmd.ExecuteReader();
if (reader != null)
{
while (reader.Read())
{
// There is only 1 column, so just retrieve it using the ordinal position
quizid = reader["mQuizID"].ToString();
}
}
reader.Close();
}
string cmdText2 = "SELECT Username FROM dbo.employee";
using (SqlCommand cmd = new SqlCommand(cmdText2, conn))
{
SqlDataReader reader = cmd.ExecuteReader();
if (reader != null)
{
while (reader.Read())
{
var sName = reader.GetString(0);
if (!string.IsNullOrEmpty(sName))
{
if (sbEmailAddresses.Length != 0)
{
sbEmailAddresses.Append(",");
}
// Just use the ordinal position for the user name since there is only 1 column
sbEmailAddresses.Append(sName).Append("@MailServer.com");
}
}
}
reader.Close();
}
string cmdText3 = "UPDATE dbo.Quiz SET IsSent = 1 WHERE QuizId = @QuizID";
using (SqlCommand cmd = new SqlCommand(cmdText3, conn))
{
// Add the parameter to the command
var oParameter = cmd.Parameters.Add("@QuizID", SqlDbType.Int);
var sEMailAddresses = sbEmailAddresses.ToString();
string link = "<a href='http://localhost/test.aspx?testid=" + quizid + "'> Click here to participate </a>";
string body = @".................................. ";
int sendCount = 0;
List<string> addressList = new List<string>(sEMailAddresses.Split(','));
StringBuilder addressesToSend = new StringBuilder();
if (!string.IsNullOrEmpty(quizid))
{
for (int userIndex = 0; userIndex < addressList.Count; userIndex++)
{
sendCount++;
if (addressesToSend.Length > 0)
addressesToSend.Append(",");
addressesToSend.Append(addressList[userIndex]);
if (sendCount == 10 || userIndex == addressList.Count - 1)
{
SendEmail(addressesToSend.ToString(), "", "Notification", body, true);
addressesToSend.Clear();
sendCount = 0;
}
}
// Update the parameter for the current quiz
oParameter.Value = quizid;
// And execute the command
cmd.ExecuteNonQuery();
}
}
conn.Close();
}
}
更新：
伙计们，你们没有明白我的意思。整个电子邮件将是一个图像，并且该图像的小部分（如小圆圈）将作为超链接而不是整个图像。而那个链接我们每周都会更改，比如default.aspx/testid=12等等。那么该怎么做呢？
更新#2： 我更新了代码的以下部分以包含图像，但我在添加 AlternateViews.ADD(av) 时遇到了问题。如何解决这个问题？
string body = @"........................";
";
AlternateView av = AlternateView.CreateAlternateViewFromString(body, null, MediaTypeNames.Text.Html);
LinkedResource lr = new LinkedResource("~/EmailNotification.jpg");
lr.ContentId="image1";
av.LinkedResources.Add(lr);
//msg.AlternateViews.Add(av);
更新#3：
protected void Page_Load(object sender, EventArgs e)
{
Send();
}
protected void SendEmail(string toAddresses, string fromAddress, string MailSubject, string MessageBody, bool isBodyHtml, AlternateView av)
{
SmtpClient sc = new SmtpClient("Mail Adderess");
try
{
MailMessage msg = new MailMessage();
msg.From = new MailAddress("test@MailServer.com", "TestSystem");
//QuizLink is appSetting inside your web config
string newLink = System.Configuration.ConfigurationManager.AppSettings["QuizLink"].ToString();
string html = "<h1>Quiz!</h1><img src=/fulladdress/someimage.png usemap ='#clickMap'>";
html += "<map id =\"clickMap\" name=\"clickMap\">" +
"<area shape =\"rect\" coords =\"0,0,82,126\" href ="+ newLink +" alt=\"Quiz\" /></map>";
msg.Bcc.Add(toAddresses);
msg.Subject = MailSubject;
msg.Body = MessageBody;
msg.IsBodyHtml = isBodyHtml;
msg.AlternateViews.Add(av);
sc.Send(msg);
}
catch (Exception ex)
{
throw ex;
}
}
protected void Send()
{
string connString = "Data Source=localhost;Initial Catalog=TestDB;Integrated Security=True";
using (SqlConnection conn = new SqlConnection(connString))
{
var sbEmailAddresses = new System.Text.StringBuilder(2000);
string quizid = "";
// Open DB connection.
conn.Open();
string cmdText = "SELECT MIN (QuizID) As mQuizID FROM dbo.QUIZ WHERE IsSent <> 1";
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
SqlDataReader reader = cmd.ExecuteReader();
if (reader != null)
{
while (reader.Read())
{
// There is only 1 column, so just retrieve it using the ordinal position
quizid = reader["mQuizID"].ToString();
}
}
reader.Close();
}
string cmdText2 = "SELECT Username FROM dbo.employee";
using (SqlCommand cmd = new SqlCommand(cmdText2, conn))
{
SqlDataReader reader = cmd.ExecuteReader();
if (reader != null)
{
while (reader.Read())
{
var sName = reader.GetString(0);
if (!string.IsNullOrEmpty(sName))
{
if (sbEmailAddresses.Length != 0)
{
sbEmailAddresses.Append(",");
}
sbEmailAddresses.Append(sName).Append("@MailServer");
}
}
}
reader.Close();
}
string cmdText3 = "UPDATE dbo.Quiz SET IsSent = 1 WHERE QuizId = @QuizID";
using (SqlCommand cmd = new SqlCommand(cmdText3, conn))
{
// Add the parameter to the command
var oParameter = cmd.Parameters.Add("@QuizID", SqlDbType.Int);
var sEMailAddresses = sbEmailAddresses.ToString();
string link = "<a href='http://localhost/Test.aspx?testid=" + quizid + "'> Click here to participate </a>";
string body = @".............................";
AlternateView av = AlternateView.CreateAlternateViewFromString(body, null, MediaTypeNames.Text.Html);
LinkedResource lr = new LinkedResource("~/EmailNotification.jpg", MediaTypeNames.Image.Jpeg);
lr.ContentId="image1";
av.LinkedResources.Add(lr);
//msg.AlternateViews.Add(av);
int sendCount = 0;
List<string> addressList = new List<string>(sEMailAddresses.Split(','));
StringBuilder addressesToSend = new StringBuilder();
if (!string.IsNullOrEmpty(quizid))
{
for (int userIndex = 0; userIndex < addressList.Count; userIndex++)
{
sendCount++;
if (addressesToSend.Length > 0)
addressesToSend.Append(",");
addressesToSend.Append(addressList[userIndex]);
if (sendCount == 10 || userIndex == addressList.Count - 1)
{
SendEmail(addressesToSend.ToString(), "", "Notification", body, true, av);
addressesToSend.Clear();
sendCount = 0;
}
}
// Update the parameter for the current quiz
oParameter.Value = quizid;
// And execute the command
cmd.ExecuteNonQuery();
}
;
}
}
conn.Close();
}
}