C#静态字典在抽象类.NET 2.0中声明和初始化

public abstract class MyClass
{
    protected static Dictionary<string, string> myDictionary;
}

public abstract class MyClass
{
    protected static Dictionary<string, string> myDictionary;

    static MyClass()
    {
        myDictionary = new Dictionary<string, string>();
    }
}

public abstract class MyClass
{
    protected static Dictionary<string, string> myDictionary;

    static MyClass()
    {
        myDictionary = new Dictionary<string, string>();
        AddItem("key1", "value1");
        AddItem("key2", "value2");
    }

    protected static void AddItem(string key, string value)
    {
        myDictionary.Add(key, value);
    }
}

public class MyDerivedClass : MyClass
{
    public void DoSomething()
    {
        string value = myDictionary["key1"];
        // ...
    }
}