C# add properties at runtime

Question

I\'ve read few posts, and I\'m still having troubles with adding properties to a class in runtime. It should be simple, because I have a class like this:

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Answer 1

I don't think adding a property is the right thing to do here. The attributes like "Email" or "Phone" are just some additional pairs of a key and a value. You could use a Dictionary, but that would prevent you from using a key more than once (more than one email address for a contact for example). So you could just as well use a List<KeyValuePair<string, string>>. Like that:

public class MyClass
{
    String Template;
    String Term;
    public List<KeyValuePair<string, string>> Attributes { get; private set; }

    public MyClass() {
        Attributes = new List<KeyValuePair<string, string>();
    }

    public void AddAttribute(string key, string value) {
        Attributes.Add(new KeyValuePair<string, string>(key, value));
    }
}

// to be used like this: 
MyClass instance = new MyClass();
instance.AddAttribute("Email", "test@example.com");
instance.AddAttribute("Phone", "555-1234");

Answer 2

If you have c# 4.0 you can use the Expando object.

for earlier versions of c#, the generally accepted way of doing this is to create a "property bag" i.e. a collection (or dictionary) of key value pairs

dynamic foo = new ExpandoObject();
foo.Bar = "test";

Answer 3

you could add an dictionary with for your Key/Value-Pairs. Then if you add your attributes you just add Key = Attributename, Value = YourValue to the dictionary. Reading is as easy - just get the Value to the Key = Attributename from your dictionary.