can some one tell me how can i validate a url like http://www.abc.com
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3What do you mean 'validate', validate for what? As a valid URL? As a real, accessible web site? Validate the colour?Lazarus– Lazarus2010-06-17 12:23:53 +00:00Commented Jun 17, 2010 at 12:23
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I have define the pattern abc.commaztt– maztt2010-06-18 10:21:49 +00:00Commented Jun 18, 2010 at 10:21
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10 Answers
Let the System.Uri do the heavy lifting for you, instead of a RegEx:
public class UrlAttribute : ValidationAttribute
{
public UrlAttribute()
{
}
public override bool IsValid(object value)
{
var text = value as string;
Uri uri;
return (!string.IsNullOrWhiteSpace(text) && Uri.TryCreate(text, UriKind.Absolute, out uri ));
}
}
Comments
Now (at least form ASP.NET MVC 5) you can use UrlAttribute and that includes server and client validation:
[Url]
public string WebSiteUrl { get; set; }
2 Comments
ASpirin
There is a problem with localhost, because it doesn't have 1st level domain
GameSalutes
Note that if you want to also make sure it is not-null then you also need
Required so it needs to be [Required,Url] to cover the not-null case as well.If you are using MVC3 RTM, you can just use [URL] validation attribute.
1 Comment
Rajeshkumar Kandhasamy
+1 and Many thanks for the Helpful link to the nice article., :)
If, by the title of your post, you want to use MVC DataAnnotations to validate a url string, you can write a custom validator:
public class UrlAttribute : ValidationAttribute
{
public UrlAttribute() { }
public override bool IsValid(object value)
{
//may want more here for https, etc
Regex regex = new Regex(@"(http://)?(www\.)?\w+\.(com|net|edu|org)");
if (value == null) return false;
if (!regex.IsMatch(value.ToString())) return false;
return true;
}
}
Phil Haack has a good tutorial that goes beyond this and also includes adding code to validate on the client side via jQuery: http://haacked.com/archive/2009/11/19/aspnetmvc2-custom-validation.aspx
Comments
What about using URL attribute, like:
public class ProveedorMetadata
{
[Url()]
[Display(Name = "Web Site")]
public string SitioWeb { get; set; }
}
1 Comment
Suncat2000
I thought so, too. That only works for HTTP, HTTPS, and FTP. If you want other URLs - like mailto or file! - you're screwed, which is normal for Microsoft.
Here is proper validation attribute code used in prod system:
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class UriValidation : ValidationAttribute
{
public override bool IsValid(object value)
{
if (value == null || value.ToString() == string.Empty)
{
return true;
}
try
{
Uri result;
if (Uri.TryCreate(value.ToString(), UriKind.RelativeOrAbsolute, out result))
{
if (result.Scheme.StartsWith("http") || result.Scheme.StartsWith("https"))
{
return true;
}
}
}
catch
{
return false;
}
return false;
}
}
answered Jun 21, 2014 at 6:26
sandeep talabathula
3,3183 gold badges33 silver badges39 bronze badges
Comments
Use a regular expression data annotation, and use a regex like:
http://www\.\w+\.(com|net|edu|org)
Depending on what you need to validate; are you requiring http: or are you requiring www.? So that could change the regular expression, if optional, to:
(http://)?(www\.)?\w+\.(com|net|edu|org)
Comments
I use this regular expression for Internal or external URLS on my site.
((?:https?\:\/\/|\/.)(?:[-a-z0-9]+\.)*[-a-z0-9]+.*)
Comments
Since .NET Framework 4.5 all the way thru to .NET 7+, you can use the Url attribute on the model's property.
[Url]
public string MyUrl { get; set; }
Comments
Uri.IsWellFormedUriString checks that the URL format is correct and does not require escaping.
/// <summary>
/// Ensures the property is a valid URL.
/// </summary>
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public class ValidateUrlAttribute : ValidationAttribute
{
public ValidateUrlAttribute()
{
}
public override bool IsValid(object value)
{
// Do not validate missing URLs - people can use [Required] for that.
string text = (value as string) ?? "";
if (text == "")
return true;
return Uri.IsWellFormedUriString(text, UriKind.Absolute);
}
}