将纯电子邮件地址解析为两部分

Question

How do I get the username and the domain from an email address of:

string email = "hello@example.com";
//Should parse into:
string username = "hello";
string domain = "example.com";

I'm seeking the shortest code to do this, not necessarily efficient.

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Scenario: I want to parse it in my ASP.NET MVC view so I can cloak it.

Answer 1

Use the MailAddress class

MailAddress addr = new MailAddress("hello@site.example");
string username = addr.User;
string domain = addr.Host;

This method has the benefit of also parsing situations like this (and others you may not be expecting):

MailAddress addr = new MailAddress("\"Mr. Hello\" <hello@site.example>");
string username = addr.User;
string host = addr.Host;

In both cases above:

Debug.Assert(username.Equals("hello"));
Debug.Assert(host.Equals("site.example"));

At the top of your file with the rest of your using directives add:

using System.Net.Mail;

Answer 2

String[] parts = "hello@example.com".Split(new[]{ '@' });
String username = parts[0]; // "hello"
String domain = parts[1]; // "example.com"

Answer 3

string username = email.Split('@')[0];
string domain = email.Split('@')[1];

Answer 4

Use this it will not give exception when no domain or username found instead it will give null value for that,

C# :

string email = "hello@example.com";

string username = email.Split('@').ElementAtOrDefault(0);
string domain = email.Split('@').ElementAtOrDefault(1);

VB :

Dim email as String = "hello@example.com";
Dim username = email.Split("@".ToCharArray()).ElementAtOrDefault(0);
Dim domain = email.Split("@".ToCharArray()).ElementAtOrDefault(1);

Answer 5

int i = email.IndexOf('@');
if (i >= 0)
{
    username = email.Substring(0, i);
    domain = email.Substring(i + 1);
}