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2010-07-12T13:31:16.850
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2017-05-23T12:00:20.313
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Use <a href="http://msdn.microsoft.com/en-us/library/system.uri.trycreate.aspx" rel="nofollow noreferrer">Uri.TryCreate</a> to create a new Uri object only if your url string is a valid URL. If the string is not a valid URL, TryCreate returns false. <pre><code>string myString = "http://someUrl"; Uri myUri; if (Uri.TryCreate(myString, UriKind.RelativeOrAbsolute, out myUri)) { //use the uri here } </code></pre> UPDATE TryCreate or the Uri constructor will happily accept strings that may appear invalid, eg "Host: www.stackoverflow.com","Host:%20www.stackoverflow.com" or "chrome:about". In fact, these are perfectly valid URIs that specify a custom scheme instead of "http". The documentation of the <a href="http://msdn.microsoft.com/en-us/library/system.uri.scheme.aspx" rel="nofollow noreferrer">Uri.Scheme</a> property provides more examples like "gopher:" (anyone remember this?), "news", "mailto", "uuid". An application can register itself as a custom protocol handler as described in <a href="http://msdn.microsoft.com/en-us/library/aa767914.aspx" rel="nofollow noreferrer">MSDN</a> or other SO questions, eg <a href="https://stackoverflow.com/questions/80650/how-do-i-register-a-custom-url-protocol-in-windows">How do I register a custom URL protocol in Windows?</a> TryCreate doesn't provide a way to restrict itself to specific schemes. The code needs to check the Uri.Scheme property to ensure it contains an acceptable value UPDATE 2 Passing a weird string like <code>"></script><script>alert(9)</script></code> will return <code>true</code> and construct a relative Uri object. Calling <a href="http://msdn.microsoft.com/en-us/library/system.uri.iswellformedoriginalstring%28v=vs.110%29.aspx" rel="nofollow noreferrer">Uri.IsWellFormedOriginalString</a> will return false though. So you probably need to call <code>IsWellFormedOriginalString</code> if you want to ensure that relative Uris are well formed. On the other hand, calling <code>TryCreate</code> with <code>UriKind.Absolute</code> will return false in this case. Interestingly, Uri.IsWellFormedUriString calls TryCreate internally and then returns the value of <code>IsWellFormedOriginalString</code> if a relative Uri was created.
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