why the following fails

 Uri test = new Uri("http%3A%2F%2F100.100.1.1%3A8080");

An unhandled exception of type 'System.UriFormatException' occurred in System.开发者_C百科dll

Additional information: Invalid URI: The format of the URI could not be determined.

Anyone know why I cannot pass in a URL encoded string to the constructor of Uri?

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Do not escape it and try using http://100.100.1.1:8080.

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The Uri Constructor requires the String to be a valid RFC2396 URI. There's this Uri.CheckSchemeName Method to check if your passed URI is valid.

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Are you missing a % before the second 2F? Try passing the string through a URL un-encoder and make sure the result is what you expected.