How to clean up if else series

Question

Work in C#, want to reduce if else series, entity have two property FromServiceID and ToServiceID ,suppose my ServiceClass instanc

Answer 1

Use a Dictionary. Something like this:

Dictionary dictionary = new Dictionary()
{
    {1,  new ServiceClass()},
    {2,  new ServiceClass()},
    {3,  new BTWithdrawal()},//assume BTWithdrawal inherits from ServiceClass
};

An example of how using it:

ServiceClass value=new ServiceClass();
value.FromServiceId=1;
value.ToServiceId = 2;
dictionary.TryGetValue(value.FromServiceId, out value);
//or dictionary.TryGetValue(value.ToServiceId, out value);
if (value != null) MessageBox.Show(value.Id.ToString());