问题
I have the following scenario:
IPAddress ip;
IPAddress.TryParse("192.168", out ip);
if(ip == null){//do something with IP}
I would expect the parsing to fail, instead it is parsed as "192.0.0.168". What am I missing here? (IPAddress.Parse works the same)
回答1:
From the documentation of Parse:
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
回答2:
The documentation, which includes similar examples to yours, is pretty clear:
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.
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
回答3:
Type http://192.168 into your browser's address bar. What happens?
This is expected behaviour.
来源：https://stackoverflow.com/questions/12566664/ipaddress-tryparse-parses-192-168-to-192-0-0-168