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Tuesday, February 22, 2005


Why Do We have Different exception Classes ?

i still get the same question frequently . why do we have more than 1 exception class ?

isnt it enough to write code like this :

try {

// protected Code}

catch (Exception ex)

{ // switch (ex) and handle each exception separately }

the exception class will catch all kind of exceptions . and we can internally handle each exception separately .

no , this is not enough , why ?

let's take this sample

try {System.IO.File.Delete("z:\filenotfound.txt");}

catch (exception ex) { //what can we do here if we need to know the name of the file which is not found ?}

so there must be some "Data" about the kind of exception taking place , in our case the name of the file .so that's why we have FileNotFoundException . so it is much more convinient to write something like this :

try {System.IO.File.Delete("z:\filenotfound.txt");}

catch (FileNotFoundException ex) { Console.Writeline(ex.FileName);}

another example will be the ArgumentOutOfRangeException : we need to know the original value of the argument which is out of range .

try {//cause some argument out of range error;}

catch (ArgumentOutOfRangeException ex) { Console.Writeline(ex.ActualValue);}

VS 2005 :

so what is new in 2005 . in VS 2005 we have all the exception classes having a new property which is : Data , that contains all the information available about this error . it looks like the event model of .NET where Microsoft encapsulates all the information about any event in the second parameter of the event "EventArgs e". so now we have "Exception.Data"

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