We all know this thing
bool.Parse(Session["foo"].ToString())
How do implement the same PARSE method for some custom class?
So if I have
class MyClass
{
}
It would be possible to do like
MyClass.Parse(Session["foo"])
5 Answers
All you need to do is write a static method called Parse() for your class that takes the String and creates an Instance of MyClass with it.
public class MyClass
{
public static MyClass Parse(string input)
{
if(String.IsNullOrWhiteSpace(input)) throw new ArgumentException(input);
var instance = new MyClass();
// Parse the string and populate the MyClass instance
return instance;
}
}
1 Comment
NoWar
Thanks! Your solution was the first one and it is a simple one.
You could try something like this.
public static MyCustomClass Parse(object o)
{
if (o == null)
return null;
try
{
if (o is MyCustomClass)
return (MyCustomClass)o;
}
catch
{
return null;
}
return null;
}
Comments
public Class MyCustomClass{
public static MyCustomClass Parse(string str){
if (str == "Whatever"){
return new MyCustomClass();
}
else if (/*other conditions*/) {
}
}
}
Or, was there something else you didn't understand?
Comments
Absolutely - you would need to write a moderate amount of code to implement it, but you can certainly do it manually if you must:
public class MyClass {
public string First {get; private set;}
public string Last {get; private set;}
public MyClass(string first, string last) {
First = first;
Last = last;
}
public static bool Parse(string s, out MyClass res) {
res = null;
if (s == null) return false;
var tokens = s.Split(new[] {';'});
if (tokens.Length != 2) return false;
res = new MyClass(tokens[0], tokens[1]);
return true;
}
}
This version takes an output argument and returns bool; you can easily modify it to throw an exception and return MyClass "the factory method style".
answered Apr 15, 2012 at 14:59
Sergey Kalinichenko
729k85 gold badges1.2k silver badges1.6k bronze badges
Comments
public class foo
{
public static foo Parse(object obj)
{
return new foo(obj);
}
public foo(){}
public foo(object obj)
{
//your code to parse from obj to foo..
}
}
in your 'frame/outer' code:
var t = foo.Parse(someInstance);
Parse()method?MyClassin theSession?