If your first catch block catches System.Exception then no catch following it could possibly be reached). This prevents you from writing a Try structure in such a way that a later catch block could never logically be called because an earlier block will necessarily be triggered first (e.g. These should be considered compile time errors. Lastly, you'll find that, especially when you use this technique, it's best to enable the compiler warning for overlapping catch blocks. You'll find though, that the TypeOf syntax is more elegant. lk olarak 'a gelip 'Textfree Web'e tklyoruz.Ardndan 'sign up FREE' yazsna tklayp siteye kayt oluyoruz.Kayt srasnda posta kodu soracaktr.Herhangi bir yerin posta kodunu girebilirsiniz.
Lastly, to get a System.Type object for a class without instantiating it use VBs GetType operator e.g. ile sitelerdeki telefon dorulama ilemini fake bir telefon numaras girerek yapabilirsiniz.
You can then put in other catch blocks with different filers or a last catch block with no filter to catch any unspecified PingExceptions.įeel free to use the When clause in VB.NET because it's cool. Would probably be overkill as if InnerException Is Nothing the TypeOf operation will return False and the catch block won't be executed. "When pEx.InnerException IsNot Nothing AndAlso TypeOf pEx.InnerException Is SocketException" To compare the type of a single variable you needn't instantiate a second.Ĭatch pEx As PingException When TypeOf pEx.InnerException Is SocketException Reply = pinger.Send("some_pc_name_or_IP_address")Ĭatch ex As For example:ĭim pinger As = New ĭim reply As Pinger is not affiliated with Skype, though. It blocks the call from connecting to you, also Pinger doesn’t allow the caller to leave a message for you. Pinger allows a voicemail to answer a call directed to you. You'll want to use some exception handling with Try/Catch blocks in order to test for the exceptions. Pinger is an iPhone and iPod Touch application which works together with an IM service called Textfree. It is probably a socket exception indicating an unknown hostname. If you get that, look at the InnerException. The one you are probably getting is (VS.80).aspx. HostNameOrAddress could not be resolved to a valid IP address. See the inner exception for the exact exception that was thrown.
HostNameOrAddress is a null reference (Nothing in Visual Basic) or is an empty string ("").Īddress is an IPv6 address and the local computer is running an operating system earlier than Windows 2000.Īn exception was thrown while sending or receiving the ICMP messages. Ping.Send() can throw several exceptions.