我正在尝试使用以下代码使用c#发送电子邮件。
MailMessage mail = new MailMessage();
mail.From = new MailAddress(fromAddress, friendlyName);
mail.To.Add(toAddress);
mail.CC.Add(ccAddress);
//set the content
mail.Subject = emailSubject;
mail.Body = emailHeader + "\n" + emailBody;
//send the message
SmtpClient smtp = new SmtpClient(ServerAddress);
smtp.Credentials = CredentialCache.DefaultNetworkCredentials;
mail.IsBodyHtml = true;
smtp.Send(mail);
现在我的函数收到的“toAddress”字符串可能包含一个地址,或者它可能包含许多逗号分隔的地址。
现在的问题是,在多个逗号分隔的地址的情况下,其中一个或两个可能是错误的电子邮件地址格式。
因此,当我尝试使用此代码发送电子邮件时,我得到例外:
“指定的字符串不是电子邮件地址所需的格式。”
有没有办法验证逗号分隔的电子邮件地址? 我曾在某处读过,验证电子邮件地址的唯一方法是向其发送电子邮件,因为验证电子邮件地址的正则表达式可能会非常庞大。
另外,我无法控制设计,或者地址字符串如何影响我的功能,我无法在UI中添加电子邮件验证,所以我很无奈......
我的问题是电子邮件不会以逗号分隔字符串的形式发送到所有地址,即使只有某些的地址格式错误。
有没有办法在.NET中正确验证电子邮件地址?有没有办法淘汰糟糕的电子邮件地址并将邮件发送给好的邮件地址?
答案 0 :(得分:31)
这是我们生产的代码(甚至为您添加了逗号)。通常你不应该使用try / catch进行验证,但它在这里运行良好。我认为这比尝试重新编码验证器更好。
string[] allToAddresses = to.Split(";,".ToCharArray(),
StringSplitOptions.RemoveEmptyEntries)
foreach (string toAddress in allToAddresses)
{
try
{
message.To.Add(toAddress);
}
catch (FormatException)
{
//do nothing, illformed address. screw it.
}
}
答案 1 :(得分:24)
目前我们正在使用以下功能,它对我们来说非常有效:)
public static bool IsValidEmail(string email)
{
// source: http://thedailywtf.com/Articles/Validating_Email_Addresses.aspx
Regex rx = new Regex(
@"^[-!#$%&'*+/0-9=?A-Z^_a-z{|}~](\.?[-!#$%&'*+/0-9=?A-Z^_a-z{|}~])*@[a-zA-Z](-?[a-zA-Z0-9])*(\.[a-zA-Z](-?[a-zA-Z0-9])*)+$");
return rx.IsMatch(email);
}
请使用此:
(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])
答案 2 :(得分:22)
您可以在逗号上拆分电子邮件字符串,并使用简单(或巨大的)电子邮件正则表达式验证每个电子邮件地址。或者,尝试创建一个MailAddress
对象;它也支持一些基本的地址验证。
答案 3 :(得分:15)
拥有100%符合RFC的电子邮件验证is hard,有关详细信息,请参阅this answer。在.NET中,两种相对简单的方法是使用MailAddress
try {
new MailAddress("invalid_email");
} catch (FormatException) {
// invalid
}
来自MSDN的更严格的基于Regex的方法(处理.NET 4.5的IDN和Regex解析超时):
// NET 4.0
Boolean mappingInvalid = false;
emailString = Regex.Replace(emailString, @"(@)(.+)$", match => {
String domainName = match.Groups[2].Value;
try {
domainName = new IdnMapping().GetAscii(domainName);
} catch (ArgumentException) {
mappingInvalid = true;
}
return match.Groups[1].Value + domainName;
});
if (mappingInvalid) {
return false;
}
return Regex.IsMatch(emailString,
@"^(?("")(""[^""]+?""@)|(([0-9a-z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-z])@))" +
@"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-z][-\w]*[0-9a-z]*\.)+[a-z0-9]{2,17}))$",
RegexOptions.IgnoreCase);
答案 4 :(得分:5)
以下将检查电子邮件地址的格式是否正确(不是实际存在的):
private bool isEmail(string inputEmail)
{
Regex re = new Regex(@"^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$",
RegexOptions.IgnoreCase);
return re.IsMatch(inputEmail);
}
我用更简单的表达式(包括不区分大小写)更新了这个,以便希望它更清晰。
以下是验证域实际存在的代码的基础知识:
private bool isRealDomain(string inputEmail)
{
bool isReal = false;
try
{
string[] host = (inputEmail.Split('@'));
string hostname = host[1];
IPHostEntry IPhst = Dns.GetHostEntry(hostname);
IPEndPoint endPt = new IPEndPoint(IPhst.AddressList[0], 25);
Socket s = new Socket(endPt.AddressFamily,
SocketType.Stream, ProtocolType.Tcp);
s.Connect(endPt);
s.Close();
isReal = true;
}
catch (<specific exceptions here>)
{
}
return isReal;
}
您可以执行更多操作,例如,尝试连接以验证域将接收邮件。此外,您需要确保捕获必要的异常并正确处理它们。
答案 5 :(得分:3)
using System.ComponentModel.DataAnnotations;
return new EmailAddressAttribute().IsValid(strIn);
答案 6 :(得分:2)
似乎没有一种验证电子邮件地址的好方法。
我还没有找到一个正确验证的正则表达式。我有一些电子邮件地址被正则表达式阻止的情况。因此,我们的重点是确保MailMessage在发送期间不会抛出异常。如果是,我们可以通知用户。但除此之外,如果您提供错误的电子邮件地址,则不会收到电子邮件。
答案 7 :(得分:2)
因为其他答案似乎都没有显示100%正在运行的正则表达式,所以我会有所作为。这取自生产代码,不受单字母TLD问题(me@mydomain.x)的影响。
private bool IsEmailSyntaxValid(string emailToValidate)
{
return System.Text.RegularExpressions.Regex.IsMatch(emailToValidate,
@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
}
不记得我从哪里得到这个,但正如我所说,它对我来说很有用。
答案 8 :(得分:2)
Microsoft刚刚更新了有关验证电子邮件的文档,效果很好。链接:https://docs.microsoft.com/en-us/dotnet/standard/base-types/how-to-verify-that-strings-are-in-valid-email-format
摘要:
using System;
using System.Globalization;
using System.Text.RegularExpressions;
public class RegexUtilities
{
bool invalid = false;
public bool IsValidEmail(string strIn)
{
invalid = false;
if (String.IsNullOrEmpty(strIn))
return false;
// Use IdnMapping class to convert Unicode domain names.
try {
strIn = Regex.Replace(strIn, @"(@)(.+)$", this.DomainMapper,
RegexOptions.None, TimeSpan.FromMilliseconds(200));
}
catch (RegexMatchTimeoutException) {
return false;
}
if (invalid)
return false;
// Return true if strIn is in valid email format.
try {
return Regex.IsMatch(strIn,
@"^(?("")("".+?(?<!\\)""@)|(([0-9a-z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-z])@))" +
@"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-z][-0-9a-z]*[0-9a-z]*\.)+[a-z0-9][\-a-z0-9]{0,22}[a-z0-9]))$",
RegexOptions.IgnoreCase, TimeSpan.FromMilliseconds(250));
}
catch (RegexMatchTimeoutException) {
return false;
}
}
private string DomainMapper(Match match)
{
// IdnMapping class with default property values.
IdnMapping idn = new IdnMapping();
string domainName = match.Groups[2].Value;
try {
domainName = idn.GetAscii(domainName);
}
catch (ArgumentException) {
invalid = true;
}
return match.Groups[1].Value + domainName;
}
}
答案 9 :(得分:1)
你总是可以在this site 巨大使用正则表达式,并且完全无法读取,但它会获得大多数边缘情况。
(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]
)+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:
\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(
?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[
\t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\0
31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\
](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+
(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:
(?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z
|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)
?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\
r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[
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\t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*
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\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>
@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"
(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t]
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:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[
\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".\[\] \000-
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^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\"
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]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\
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:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*
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\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[
^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]
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?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\
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?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[
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:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|
\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:
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]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)
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()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)
?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>
@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[
\t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,
;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t]
)*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\
".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ \t])*)?
(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".
\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:
\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\[
"()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])
*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])
+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\
.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z
|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:(
?:\r\n)?[ \t])*))*)?;\s*)
答案 10 :(得分:0)
是的,在分隔符上拆分电子邮件字符串,然后验证每个电子邮件地址。这是一个例子,它将在第二个电子邮件地址(foo#bar.com)上失败。我使用了asp.net正则表达式控件中的正则表达式来验证地址。
String email = "bar@foo.com;foo#bar.com";
String expression = @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";
Regex regex = new Regex(expression);
String[] emails = email.Split(new Char[] { ';' });
foreach (String s in emails)
{
Match m = regex.Match(s);
if (!m.Success)
{
// Validation fails.
}
}
答案 11 :(得分:0)
string uname = Convert.ToString(string);
string expression = @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";
Regex regex = new Regex(expression);
Match m = regex.Match(uname);
if (m.Success)
{
emailId = uname;
}
答案 12 :(得分:0)
您可以使用 Regex 。只需编写以下代码即可。
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
html, body{
margin:0;
padding:0;
height: 100vh;
}
.parallax {
position:relative;
/* The image used */
background-image: url("img_parallax.jpg");
/* Set a specific height */
min-height: 500px;
/* Create the parallax scrolling effect */
background-attachment: fixed;
background-position: center;
background-repeat: no-repeat;
background-size: cover;
}
</style>
</head>
<body >
<div style="height:100% ; overflow:auto; position:relative; z-index:1 ">
<div>
<p>Scroll Up and Down this page to see the parallax scrolling effect.</p>
<div class="parallax">
<div style="height:300px"></div>
<div style="background-color:red;font-size:36px">
Scroll Up and Down this page to see the parallax scrolling effect.
This div is just here to enable scrolling.
Tip: Try to remove the background-attachment property to remove the scrolling effect.
Scroll Up and Down this page to see the parallax scrolling effect.
This div is just here to enable scrolling.
Tip: Try to remove the background-attachment property to remove the scrolling effect.
Scroll Up and Down this page to see the parallax scrolling effect.
This div is just here to enable scrolling.
Tip: Try to remove the background-attachment property to remove the scrolling effect.
</div>
</div>
</div>
</div>
</body>
</html>