I read a data from excel and determine which event I am going to execute.
event are both class created by myself (login and logout)
if the value I read = 1 , execute login
if the value I read = 2 , execute logout
I use switch but my boss say I have to use something like hashmap in Java.
In Java, I can write the code like:
table.Add( "one", login.class );
so how can I add class into hashtable using c#?
and how can I read the value and call the class method in hashtable?
You can use delegates. For example, if you had these methods:
public void Login() {
// ...
}
public void Logout() {
// ...
}
You could use this Dictionary:
Dictionary<string, Action> actions = new Dictionary<string, Action>() {
{"Login", Login},
{"Logout", Logout}
};
Then call it like:
actions[myAction]();
Of course, you'll want to make sure the key exists. You can call delegates in pretty much the same way you call a regular method. If they have arguments or return values, just use the appropriate Action<T1, T2...> or Func<T1, T2... TOut>.
{"Login", new Login().DoWhatever} for example. Either that or store an instance of the class in the dictionary - this only works if they inherit or implement a common class or interface, respectively.
Interface, such as ICallable or something similar, if you intend to call the same method. Then you can use a Dictionary<string, ICallable>
Actually, C# compiler will implement switch on strings as a hashtable, so it's unlikely you can gain anything by doing it manually.
See this post.
You could even tell your boss you already did it, and you wouldn't be lying ;)
The following code allows you to implement a DoSomething method in your objects, callable from a Dictionary index:
public interface ICallable
{
void Execute();
}
public class Login : ICallable
{
// Implement ICallable.Execute method
public void Execute()
{
// Do something related to Login.
}
}
public class Logout : ICallable
{
// Implement ICallable.Execute method
public void Execute()
{
// Do something related to Logout
}
}
public class AD
{
Dictionary<string, ICallable> Actions = new Dictionary<int, ICallable>
{
{ "Login", new Login() }
{ "Logout", new Logout() }
}
public void Do(string command)
{
Actions[command].Execute();
}
}
Example Usage
AD.Do("Login"); // Calls `Execute()` method in `Login` instance.
Execute() method? Right now it's returning void. See the interface definition?