General .NET Interfaces

Interfaces are contracts that classes or structs can define. An object can implement multiple interfaces (but in C#, can derive from only one base class). As a general rule, these interfaces’ name starts with a capital I, and then the interface name. Interfaces cannot contain member variables, or defined methods, just the signatures of the methods to be implemented. An example:

interface IMyFace
    bool IsReusable(object otherObject);
    int objID {get;set;}

Interfaces can implement each other. The most important interfaces of the .NET Framework are as follows:

.NET Interfaces
IClonable Defines the Clone method, which helps you create an instance of the class with the exact same values (fields and properties).
IComparable Defines the CompareTo method to implement type-specific comparsion methods. This method should return a negative value if your instance is less than the supplied object, positive if it is greater and 0 if they are equal.
IConvertible Provides a bunch of methods for converting the given object to a common CLR type (int, short, long, etc.).
IDisposable Defines the Dispose void. You should free up all unmanaged resources that your object uses in this method.
IEquatable A generic interface. Defines the generic Boolean Equals method, in which you can return true if your instance is equal to the provided generic-type other instance.
IFormatable Provides an overload of the ToString method, in which you can specify a format string and an IFormatProvider.


Further Readings

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