我创建了一个名为Mailer的类，用于通过我的asp.net Web应用程序4.0发送图像启用电子邮件。
这是我的代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Linq;
using System.Xml;
using System.Net.Mail;
using System.Net.Mime;
using System.IO;
/// <summary>
/// Summary description for Mailer
/// </summary>
namespace MyNameSpace
{
public class Mailer
{
#region Constructeurs
public Mailer()
{
//
// TODO: Add constructor logic here
//
}
public Mailer(string sSmtp, string sPort, string sFrom, string sTo, string sSubject, string sCc, string sBcc, string sBodyHtml, List<string> sFileNames)
{
this.Smtp = sSmtp;
this.Port = sPort;
this.From = sFrom;
this.To = sTo;
this.Subject = sSubject;
this.Cc = sCc;
this.Bcc = sBcc;
this.BodyHtml = sBodyHtml;
this.FileNames = sFileNames;
}
#endregion
MailMessage Message = new MailMessage();
SmtpClient SmtpMail = new SmtpClient();
#region Champs publics
string _sSmtp;
///
/// Serveur smtp
///
public string Smtp
{
get { return _sSmtp; }
set { _sSmtp = value; }
}
string _sPort;
///
/// Serveur Port
///
public string Port
{
get { return _sPort; }
set { _sPort = value; }
}
string _sFrom;
///
/// Adresse d’envoi
///
public string From
{
get { return _sFrom; }
set { _sFrom = value; }
}
string _sTo;
///
/// Destinataire du mail
///
public string To
{
get { return _sTo; }
set { _sTo = value; }
}
string _sSubject;
///
/// Sujet du mail
///
public string Subject
{
get { return _sSubject; }
set { _sSubject = value; }
}
// Mail CC
string _sCc;
public string Cc
{
get { return _sCc; }
set { _sCc = value; }
}
// Mail Bcc
string _sBcc;
public string Bcc
{
get { return _sBcc; }
set { _sBcc = value; }
}
string _sBodyHtml;
///
/// Mail html body
///
public string BodyHtml
{
get { return _sBodyHtml; }
set { _sBodyHtml = value; }
}
List<string> _sFileNames;
public List<string> FileNames
{
get { return _sFileNames; }
set { _sFileNames = value; }
}
#endregion
public void SendHtmlMail()
{
this.Message.IsBodyHtml = true;
this.Message.From = new MailAddress(this.From);
this.Message.Sender = new MailAddress(this.From);
if (this.To.Contains(","))
{
string[] values1 = To.Split(',');
for (int i = 0; i < values1.Length; i++)
{
values1[i] = values1[i].Trim();
}
foreach (var item1 in values1)
{
this.Message.To.Add(new MailAddress(item1.ToString()));
}
}
else
{
this.Message.To.Add(new MailAddress(this.To));
}
if (!string.IsNullOrEmpty(this.Cc))
{
if (this.Cc.Contains(","))
{
string[] values2 = this.Cc.Split(',');
for (int i = 0; i < values2.Length; i++)
{
values2[i] = values2[i].Trim();
}
foreach (var item2 in values2)
{
this.Message.CC.Add(new MailAddress(item2.ToString()));
}
}
else
{
this.Message.CC.Add(new MailAddress(this.Cc));
}
}
if (!string.IsNullOrEmpty(this.Bcc))
{
if (this.Bcc.Contains(","))
{
string[] values3 = this.Bcc.Split(',');
for (int i = 0; i < values3.Length; i++)
{
values3[i] = values3[i].Trim();
}
foreach (var item3 in values3)
{
this.Message.Bcc.Add(new MailAddress(item3.ToString()));
}
}
else
{
this.Message.Bcc.Add(new MailAddress(this.Bcc));
}
}
this.Message.Subject = this.Subject;
//– Message Text/Html–//
AlternateView alternateHtml = GetAlternateViewLinkedResources(this.BodyHtml);
this.Message.AlternateViews.Add(alternateHtml);
this.SmtpMail.Host = this.Smtp;
using (DataClassesDataContext db = new DataClassesDataContext())
{
for (int i = 0; i < this.FileNames.Count; i++)
{
Attachment mailAttachment = new Attachment(Path.Combine(HttpRuntime.AppDomainAppPath, "EmailFiles/" + db.Files.Where(f => f.File_name.Equals(FileNames[i].Substring(0, 15))).Select(f => f.File_name + f.File_ext).SingleOrDefault().ToString()));
this.Message.Attachments.Add(mailAttachment);
}
}
this.SmtpMail.Send(this.Message);
}
///
/// Return AlternateView object with Linked resources
///
///
///
private AlternateView GetAlternateViewLinkedResources(string sHtmlMessage)
{
XmlDocument oXml = new XmlDocument();
//Return the resources XML datas
oXml = EmbedHtmlImage(sHtmlMessage);
//Make the replace un html body
foreach (XmlNode oNode in oXml.SelectNodes(HttpContext.Current.Server.MapPath("~/EmailImages/")))
{
sHtmlMessage = sHtmlMessage.Replace(oNode.Attributes.GetNamedItem("src").Value.ToString(), oNode.Attributes.GetNamedItem("cid").Value.ToString());
}
AlternateView oAlternateHtml = AlternateView.CreateAlternateViewFromString(sHtmlMessage, System.Text.Encoding.UTF8, MediaTypeNames.Text.Html);
//Add linked resources
foreach (XmlNode oNode in oXml.SelectNodes(HttpContext.Current.Server.MapPath("~/EmailImages/")))
{
LinkedResource oResource = null;//new LinkedResource(oNode.Attributes.GetNamedItem(“src”).Value.ToString());
sHtmlMessage = sHtmlMessage.Replace(oNode.Attributes.GetNamedItem("src").Value.ToString(), oNode.Attributes.GetNamedItem("cid").Value.ToString());
switch (oNode.Attributes.GetNamedItem("imagetype").Value.ToString())
{
case "gif":
oResource = new LinkedResource(System.Web.HttpContext.Current.Server.MapPath(oNode.Attributes.GetNamedItem("src").Value.ToString()), System.Net.Mime.MediaTypeNames.Image.Gif);
break;
case "jpg":
oResource = new LinkedResource(System.Web.HttpContext.Current.Server.MapPath(oNode.Attributes.GetNamedItem("src").Value.ToString()), System.Net.Mime.MediaTypeNames.Image.Jpeg);
break;
case "tiff":
oResource = new LinkedResource(System.Web.HttpContext.Current.Server.MapPath(oNode.Attributes.GetNamedItem("src").Value.ToString()), System.Net.Mime.MediaTypeNames.Image.Tiff);
break;
}
oResource.ContentId = oNode.Attributes.GetNamedItem("uid").Value.ToString();
//To refer to this image in the html body, use
oAlternateHtml.LinkedResources.Add(oResource);
}
return oAlternateHtml;
}
private XmlDocument EmbedHtmlImage(string sHtmlBody)
{
string sNewHtmlBody = sHtmlBody;
string sNewGuid = string.Empty;
string sSrcAttribute = string.Empty;
int iStartImageSrcAttribute = 0;
int iEndImageSrcAttribute = 0;
int iEndImageTag = 0;
//Detect if email contain image html tag, i have choose to use XmlDocument for my convenience
XmlDocument oXml = new XmlDocument();
oXml.LoadXml(@"");
Int32 iStartImageTag = sNewHtmlBody.IndexOf("", iEndImageSrcAttribute);
XmlNode oNode;
XmlAttribute oAtt;
if (CheckExtension(sNewHtmlBody, iStartImageSrcAttribute + 5, (iEndImageSrcAttribute - (iStartImageSrcAttribute + 5))))
{
sSrcAttribute = sNewHtmlBody.Substring(iStartImageSrcAttribute + 5, (iEndImageSrcAttribute - (iStartImageSrcAttribute + 5)));
oNode = oXml.CreateNode(XmlNodeType.Element, "image", "");
oAtt = oXml.CreateAttribute("fulltag");
oAtt.Value = sNewHtmlBody.Substring(iStartImageTag, (iEndImageTag - iStartImageTag) + 1);
oNode.Attributes.Append(oAtt);
oAtt = oXml.CreateAttribute("src");
oAtt.Value = sSrcAttribute;
oNode.Attributes.Append(oAtt);
sNewGuid = Guid.NewGuid().ToString();
oAtt = oXml.CreateAttribute("uid");
oAtt.Value = sNewGuid;
oNode.Attributes.Append(oAtt);
oAtt = oXml.CreateAttribute("cid");
oAtt.Value = "cid:" + sNewGuid;
oNode.Attributes.Append(oAtt);
oAtt = oXml.CreateAttribute("imagetype");
if (sSrcAttribute.ToLower().EndsWith("jpg"))
{
oAtt.Value = "jpg";
}
if (sSrcAttribute.ToLower().EndsWith("gif"))
{
oAtt.Value = "gif";
}
if (sSrcAttribute.ToLower().EndsWith("tiff"))
{
oAtt.Value = "tiff";
}
oNode.Attributes.Append(oAtt);
//Add xml node to root
oXml.SelectSingleNode("/EasyMail_New").AppendChild(oNode);
}
while (iStartImageTag < sNewHtmlBody.LastIndexOf(@"<img"))
{
iStartImageTag = sNewHtmlBody.IndexOf("", iEndImageSrcAttribute);
//Evite les doublons
XmlNode oExistNode = oXml.SelectSingleNode(@"/EasyMail_New/EmailImages[@src = '" + sNewHtmlBody.Substring(iStartImageSrcAttribute + 5, (iEndImageSrcAttribute - (iStartImageSrcAttribute + 5))) + @"']");
if (oExistNode == null)
{
if (CheckExtension(sNewHtmlBody, iStartImageSrcAttribute + 5, (iEndImageSrcAttribute - (iStartImageSrcAttribute + 5))))
{
sSrcAttribute = sNewHtmlBody.Substring(iStartImageSrcAttribute + 5, (iEndImageSrcAttribute - (iStartImageSrcAttribute + 5)));
oNode = oXml.CreateNode(XmlNodeType.Element, "image", "");
oAtt = oXml.CreateAttribute("fulltag");
oAtt.Value = sNewHtmlBody.Substring(iStartImageTag, (iEndImageTag - iStartImageTag) + 1);
oNode.Attributes.Append(oAtt);
oAtt = oXml.CreateAttribute("src");
oAtt.Value = sSrcAttribute;
oNode.Attributes.Append(oAtt);
//Generation du Guid
sNewGuid = Guid.NewGuid().ToString();
oAtt = oXml.CreateAttribute("uid");
oAtt.Value = sNewGuid;
oNode.Attributes.Append(oAtt);
oAtt = oXml.CreateAttribute("cid");
oAtt.Value = "cid:" + sNewGuid;
oNode.Attributes.Append(oAtt);
oAtt = oXml.CreateAttribute("imagetype");
if (sSrcAttribute.ToLower().EndsWith("jpg"))
{
oAtt.Value = "jpg";
}
if (sSrcAttribute.ToLower().EndsWith("gif"))
{
oAtt.Value = "gif";
}
if (sSrcAttribute.ToLower().EndsWith("tiff"))
{
oAtt.Value = "tiff";
}
oNode.Attributes.Append(oAtt);
//Add xml node to root
oXml.SelectSingleNode("/EasyMail_New").AppendChild(oNode);
}
}
}
return oXml;
}
private Boolean CheckExtension(string sNewHtmlBody, Int32 iBegin, Int32 iLength)
{
Boolean bRes = false;
bRes = (sNewHtmlBody.Substring(iBegin, iLength).ToLower().EndsWith(".gif")) ? true : bRes;
bRes = (sNewHtmlBody.Substring(iBegin, iLength).ToLower().EndsWith(".jpg")) ? true : bRes;
bRes = (sNewHtmlBody.Substring(iBegin, iLength).ToLower().EndsWith(".tiff")) ? true : bRes;
return bRes;
}
}
}
我从这样的网页中调用它：
Mailer myMail = new Mailer(Host, Port, Email, (touser1 == ',') ? ToUser.TrimEnd(',') : ToUser, txt_ComName.Text.Trim(), (cc1 == ',') ? Cc.TrimEnd(',') : Cc, (bcc1 == ',') ? Bcc.TrimEnd(',') : Bcc, sbody, file_names.ToList());
myMail.SendHtmlMail();
在运行时我收到此错误：
Server Error in '/EasyMail_New' Application.
Root element is missing.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Xml.XmlException: Root element is missing.
Source Error:
Line 241: //Detect if email contain image html tag, i have choose to use XmlDocument for my convenience
Line 242: XmlDocument oXml = new XmlDocument();
Line 243: oXml.LoadXml(@"");
Line 244: Int32 iStartImageTag = sNewHtmlBody.IndexOf("", iEndImageSrcAttribute);
Line 245:
Source File: e:\Shalin\WorkMaterial\EasyMail_New\App_Code\Mailer.cs Line: 243
Stack Trace:
[XmlException: Root element is missing.]
System.Xml.XmlTextReaderImpl.Throw(Exception e) +73
System.Xml.XmlTextReaderImpl.ParseDocumentContent() +4076618
System.Xml.XmlTextReaderImpl.Read() +145
System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace) +114
System.Xml.XmlDocument.Load(XmlReader reader) +114
System.Xml.XmlDocument.LoadXml(String xml) +168
MyNameSpace.Mailer.EmbedHtmlImage(String sHtmlBody) in e:\Shalin\WorkMaterial\EasyMail_New\App_Code\Mailer.cs:243
MyNameSpace.Mailer.GetAlternateViewLinkedResources(String sHtmlMessage) in e:\Shalin\WorkMaterial\EasyMail_New\App_Code\Mailer.cs:202
MyNameSpace.Mailer.SendHtmlMail() in e:\Shalin\WorkMaterial\EasyMail_New\App_Code\Mailer.cs:179
_Default.submit_Click(Object sender, EventArgs e) in e:\Shalin\WorkMaterial\EasyMail_New\Mail.aspx.cs:1303
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1
答案 0 :(得分：1)
错误显示错误 - 您正在尝试将空字符串加载为xml文档：
oXml.LoadXml(@"");
显然，这里缺少根元素。