/// <summary>
    /// Validates the email if it follows the valid email format
    /// </summary>
    /// <param name="emailAddress"></param>
    /// <returns></returns>
    public static bool EmailIsValid(string emailAddress)
    {
        //if string is not null and empty then check for email follow the format
        return string.IsNullOrEmpty(emailAddress)?false : new Regex(@"^(?!\.)(""([^""\r\\]|\\[""\r\\])*""|([-a-z0-9!#$%&'*+/=?^_`{|}~]|(?<!\.)\.)*)(?<!\.)@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]$", RegexOptions.IgnoreCase).IsMatch(emailAddress);
    }

Personally, I would say that you should just make sure there is an @ symbol in there, with possibly a . character. There's many regexes you could use of varying correctness, but I think most of these leave out valid email addresses, or let invalid ones through. If people want to put in a fake email address, they will put in a fake one. If you need to verify that the email address is legit, and that the person is in control of that email address, then you will need to send them an email with a special coded link so they can verify that it indeed is a real address.

public static bool IsEmail(string strEmail)
{
    Regex rgxEmail = new Regex(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
                               @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
                               @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
    return rgxEmail.IsMatch(strEmail);
}

   public bool IsValidEmail(string email)
    {
        try
        {
            var addr = new System.Net.Mail.MailAddress(email);
            return addr.Address == email;
        }
        catch
        {
            return false;
        }
    }

最优雅的方法是使用. net的内置方法。

这些方法:

都是经过考验的。我在自己的专业项目中使用了这些方法。 内部使用正则表达式，这是可靠和快速的。 由微软为c#编写。没有必要做重复的工作。 返回bool类型的结果。True表示邮件有效。

适用于。net 4.5及以上版本的用户

将此引用添加到项目中:

System.ComponentModel.DataAnnotations

现在你可以使用下面的代码:

(new EmailAddressAttribute().IsValid("youremailhere@test.test"));

使用实例

下面是一些需要声明的方法:

protected List<string> GetRecipients() // Gets recipients from TextBox named `TxtRecipients`
{
    List<string> MethodResult = null;

    try
    {
        List<string> Recipients = TxtRecipients.Text.Replace(",",";").Replace(" ", "").Split(';').ToList();

        List<string> RecipientsCleaned = new List<string>();

        foreach (string Recipient in RecipientsCleaned)
        {
            if (!String.IsNullOrWhiteSpace(Recipient))
            {
                RecipientsNoBlanks.Add(Recipient);

            }

        }

        MethodResult = RecipientsNoBlanks;

    }
    catch//(Exception ex)
    {
        //ex.HandleException();
    }

    return MethodResult;

}


public static bool IsValidEmailAddresses(List<string> recipients)
{
    List<string> InvalidAddresses = GetInvalidEmailAddresses(recipients);

    return InvalidAddresses != null && InvalidAddresses.Count == 0;

}

public static List<string> GetInvalidEmailAddresses(List<string> recipients)
{
    List<string> MethodResult = null;

    try
    {
        List<string> InvalidEmailAddresses = new List<string>();

        foreach (string Recipient in recipients)
        {
            if (!(new EmailAddressAttribute().IsValid(Recipient)) && !InvalidEmailAddresses.Contains(Recipient))
            {
                InvalidEmailAddresses.Add(Recipient);

            }

        }

        MethodResult = InvalidEmailAddresses;

    }
    catch//(Exception ex)
    {
        //ex.HandleException();

    }

    return MethodResult;

}

.．.以及演示它们的代码:

List<string> Recipients = GetRecipients();

bool IsValidEmailAddresses = IsValidEmailAddresses(Recipients);

if (IsValidEmailAddresses)
{
    //Emails are valid. Your code here

}
else
{
    StringBuilder sb = new StringBuilder();

    sb.Append("The following addresses are invalid:");

    List<string> InvalidEmails = GetInvalidEmailAddresses(Recipients);

    foreach (string InvalidEmail in InvalidEmails)
    {
        sb.Append("\n" + InvalidEmail);

    }

    MessageBox.Show(sb.ToString());

}

另外，这个例子:

扩展超出规范，因为一个字符串用于包含0，一个或多个由分号分隔的电子邮件地址; 清楚地演示了如何使用EmailAddressAttribute对象的IsValid方法。

对于.Net 4.5以下版本的用户，可以选择

对于.Net 4.5不可用的情况，我使用以下解决方案:

具体来说，我使用:

public static bool IsValidEmailAddress(string emailAddress)
{
    bool MethodResult = false;

    try
    {
        MailAddress m = new MailAddress(emailAddress);

        MethodResult = m.Address == emailAddress;

    }
    catch //(Exception ex)
    {
        //ex.HandleException();

    }

    return MethodResult;

}

public static List<string> GetInvalidEmailAddresses(List<string> recipients)
{
    List<string> MethodResult = null;

    try
    {
        List<string> InvalidEmailAddresses = new List<string>();

        foreach (string Recipient in recipients)
        {
            if (!IsValidEmail(Recipient) && !InvalidEmailAddresses.Contains(Recipient))
            {
                InvalidEmailAddresses.Add(Recipient);

            }

        }

        MethodResult = InvalidEmailAddresses;

    }
    catch //(Exception ex)
    {
        //ex.HandleException();

    }

    return MethodResult;

}

我从第1条中得到Phil的答案，并创建了这个类。 这样调用它:bool isValid = Validator.EmailIsValid(emailString);

下面是这个类:

using System.Text.RegularExpressions;

public static class Validator
{

    static Regex ValidEmailRegex = CreateValidEmailRegex();

    /// <summary>
    /// Taken from http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx
    /// </summary>
    /// <returns></returns>
    private static Regex CreateValidEmailRegex()
    {
        string validEmailPattern = @"^(?!\.)(""([^""\r\\]|\\[""\r\\])*""|"
            + @"([-a-z0-9!#$%&'*+/=?^_`{|}~]|(?<!\.)\.)*)(?<!\.)"
            + @"@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]$";

        return new Regex(validEmailPattern, RegexOptions.IgnoreCase);
    }

    internal static bool EmailIsValid(string emailAddress)
    {
        bool isValid = ValidEmailRegex.IsMatch(emailAddress);

        return isValid;
    }
}