'System.UriFormatException' in HyperLink

Question

I have some strings like this:

www.example.com/sdWqaP

twitter.com/sdfks

and want to assign them to a HyperLink

var hyperlink = new Hyperlink
{
   NavigateUri = new Uri(url),
   TargetName = "_blank",
};

if url starts with http:// it works fine, otherwise throws a UriFormatException.

Update: urls like this www.google.com aren't valid http urls. isn't there a better way than var url = "http://" + "www.google.com"

score 4 · Accepted Answer · answered Mar 14 '14 at 06:39

4

You can use

var uri = new UriBuilder(s).Uri;

Reference: http://msdn.microsoft.com/en-us/library/y868d5wh(v=vs.110).aspx

public UriBuilder(
    string uri
)
// If uri does not specify a scheme, the scheme defaults to "http:".

answered Mar 14 '14 at 06:39

lastr2d2

3,604
2
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score 1 · Answer 2 · answered Mar 14 '14 at 06:15

1

Scheme (http:// in your case) is mandatory part of Uri string. UriFormatException will be thrown if the scheme specified in uri string is not correctly formed according to Uri.CheckSchemeName() method.

[MSDN : Uri Constructor (String)].

I don't understand well what you mean "better safer way". Appending scheme in uri string is common practice anyway.

answered Mar 14 '14 at 06:15

har07

88,338
12
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137

thanks @har07. my url strings may not have `http://` as in example, and my question is how to append that scheme? isn't there a better way than `var url = "http://" + "www.google.com"`? – user3293835 Mar 14 '14 at 06:27

score 1 · Answer 3 · edited May 23 '17 at 12:05

1

Check your URL is valid and then assign to the URL

For validating a URL check the below link

How to check whether a string is a valid HTTP URL?

edited May 23 '17 at 12:05

Community

1
1

answered Mar 14 '14 at 06:27

Prasanth V J

1,126
14
32

'System.UriFormatException' in HyperLink

3 Answers3