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IPAddress::Parse Method

Converts an IP address string to an IPAddress instance.

Namespace:  System.Net
Assembly:  System (in System.dll)

public:
static IPAddress^ Parse(
	String^ ipString
)

Parameters

ipString
Type: System::String

A string that contains an IP address in dotted-quad notation for IPv4 and in colon-hexadecimal notation for IPv6.

Return Value

Type: System.Net::IPAddress
An IPAddress instance.

ExceptionCondition
ArgumentNullException

ipString is nullptr.

FormatException

ipString is not a valid IP address.

The static Parse method creates an IPAddress instance from an IP address expressed in dotted-quad notation for IPv4 and in colon-hexadecimal notation for IPv6.

The number of parts (each part is separated by a period) in ipString determines how the IP address is constructed. A one part address is stored directly in the network address. A two part address, convenient for specifying a class A address, puts the leading part in the first byte and the trailing part in the right-most three bytes of the network address. A three part address, convenient for specifying a class B address, puts the first part in the first byte, the second part in the second byte, and the final part in the right-most two bytes of the network address. For example:

Number of parts and example ipString

IPv4 address for IPAddress

1 -- "65536"

0.0.255.255

2 -- "20.2"

20.0.0.2

2 -- "20.65535"

20.0.255.255

3 -- "128.1.2"

128.1.0.2

The following code converts a string that contains an IP address, in dotted-quad notation for IPv4 or in colon-hexadecimal notation for IPv6, into an instance of the IPAddress class. Then it uses the overloaded ToString method to display the address in standard notation.

#using <System.dll>

using namespace System;
using namespace System::Net;

// This method calls the IPAddress::Parse method to check the ipAddress 
// input string. If the ipAddress argument represents a syntatically correct IPv4 or 
// IPv6 address, the method displays the Parse output into quad-notation or 
// colon-hexadecimal notation, respectively. Otherwise, it displays an 
// error message. 
void parse( String^ ipAddress )
{
   try
   {

      // Create an instance of IPAddress for the specified address string (in 
      // dotted-quad, or colon-hexadecimal notation).
      IPAddress^ address = IPAddress::Parse( ipAddress );

      // Display the address in standard notation.
      Console::WriteLine( "Parsing your input string: \"{0}\" produces this address (shown in its standard notation): {1}", ipAddress, address );
   }
   catch ( ArgumentNullException^ e ) 
   {
      Console::WriteLine( "ArgumentNullException caught!!!" );
      Console::WriteLine( "Source : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }
   catch ( FormatException^ e ) 
   {
      Console::WriteLine( "FormatException caught!!!" );
      Console::WriteLine( "Source : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "Exception caught!!!" );
      Console::WriteLine( "Source : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }

}

int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   String^ IPaddress;
   if ( args->Length == 1 )
   {
      Console::WriteLine( "Please enter an IP address." );
      Console::WriteLine( "Usage:   >cs_parse any IPv4 or IPv6 address." );
      Console::WriteLine( "Example: >cs_parse 127.0.0.1" );
      Console::WriteLine( "Example: >cs_parse 0:0:0:0:0:0:0:1" );
      return 0;
   }
   else
      IPaddress = args[ 1 ];


   // Get the list of the IPv6 addresses associated with the requested host.
   parse( IPaddress );
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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