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Punycode names contain only ASCII characters and always start with the xn- prefix. For example: Įnabling IDN converts all Unicode labels in a domain name to their Punycode equivalents. Specify whether you want Internationalized Domain Name (IDN) parsing applied to the domain name and whether IRI parsing rules should be applied. NET Framework 4.5, set a configuration option in the nfig or in the app.config file. NET Framework 4.5 and later versions, IRI is always enabled and can't be changed using a configuration option. This ensures application compatibility with prior versions of. NET Framework 2.0 behavior unless they specifically enable IRI. NET Framework versions before version 4.5 will not see any change from the. NET Framework v3.5, 3.0 SP1, and 2.0 SP1 to provide IRI support based on RFC 3987. The existing Uri class has been extended in. Using IRIs allows a URL to contain Unicode characters. The specifications for IRIs are documented in RFC 3987 published by IETF. Identifiers which facilitate this need and allow non-ASCII characters (characters in the Unicode/ISO 10646 character set) are known as International Resource Identifiers (IRIs). With the growth of the Internet, there is a growing need to identify resources using languages other than English. The specifications for URIs are documented in RFC 2396, RFC 2732, RFC 3986, and RFC 3987 published by the Internet Engineering Task Force (IETF). Upper and lower case ASCII letters from the English alphabet. Web addresses are typically expressed using uniform resource identifiers that consist of a very restricted set of characters:
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Remember to enclose the IPv6 address in square brackets, as in International Resource Identifier Support The URI class supports the use of IP addresses in both quad-notation for IPv4 protocol and colon-hexadecimal for IPv6 protocol.
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NET Framework version 2.0, this behavior has been removed, and the example string is converted to xyz:c:/abc. For example, the URI xyz:c:\abc is converted to xyz://c:/abc. NET Framework version 1.1, if the string specified to a constructor contains an unknown scheme and "c:\", the Uri class inserts "//" after the colon. Query information is any text that follows a question mark (?) in the URI the query text is stored in the Query property. A fragment identifier is any text that follows a number sign (#), not including the number sign the fragment text is stored in the Fragment property. Some URIs include a fragment identifier or a query or both. This is to support unambiguous reconstruction of a URI from the value returned by ToString. Note that some reserved characters might still be escaped in the output of the ToString method. You can transform the contents of the Uri class from an escape encoded URI reference to a readable URI reference by using the ToString method.
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When this code executes, it returns output similar to the following text. The following code snippet shows example values of the various properties on the class. WebRequest wr = WebRequest.Create(contoso) ĭim wr As WebRequest = WebRequest.Create(siteUri) WebRequest^ wr = WebRequest::Create( siteUri ) The following example creates an instance of the Uri class and uses it to create a WebRequest instance. Implements ISerializable Public Class Uri Interface ISerializable Public Class Uri Public Class Uri Public class Uri : type Uri = class type Uri = class In this article public ref class Uri public ref class Uri : System::Runtime::Serialization::ISerializable public ref class Uri : MarshalByRefObject, System::Runtime::Serialization::ISerializable public class Uri public class Uri : Provides an object representation of a uniform resource identifier (URI) and easy access to the parts of the URI.