What methods can be used to avoid size limitations or key restrictions in a dictionary?

In C#, dictionaries (Dictionary<TKey, TValue>) have restrictions on key types and their size, for example, the key must be hashable and have properly implemented GetHashCode and Equals methods.

To avoid size or key type limitations, you can:

• Use composite keys, for example, create a class or structure that combines multiple values, and implement proper GetHashCode and Equals methods for it.
• Convert large or complex keys into more compact representations, such as serializing an object into a string or using a hash function.
• Use specialized collections or data structures if the standard dictionary is not suitable.

Example of a composite key:

struct CompositeKey
{
    public int Id;
    public string Name;

    public override bool Equals(object obj) => obj is CompositeKey other && Id == other.Id && Name == other.Name;
    public override int GetHashCode() => HashCode.Combine(Id, Name);
}

var dict = new Dictionary<CompositeKey, string>();
dict[new CompositeKey { Id = 1, Name = "Test" }] = "Value";