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of of of of
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Object) String) Stream) FileStream)
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So, for example, if you have the following line of code,
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FileStream[] fsArray;
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then when the CLR creates the FileStream[] type, it will cause this type to automatically implement the IEnumerable<FileStream>, ICollection<FileStream>, and IList<FileStream> interfaces . Furthermore, the FileStream[] type will also implement the interfaces for the base types: IEnumerable<Stream>, IEnumerable<Object>, ICollection<Stream>, ICollection<Object>, IList<Stream>, and IList<Object> . Since all of these interfaces are automatically implemented by the CLR, the fsArray variable could be used wherever any of these interfaces exist . For example, the fsArray variable could be passed to methods that have any of the following prototypes:
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void M1(IList<FileStream> fsList) { } void M2(ICollection<Stream> sCollection) { } void M3(IEnumerable<Object> oEnumerable) { }
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Part III Essential Types
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Note that if the array contains value type elements, the array type will not implement the interfaces for the element s base types . For example, if you have the following line of code,
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DateTime[] dtArray; // An array of value types
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then the DateTime[] type will implement IEnumerable<DateTime>, ICollection<DateTime>, and IList<DateTime> only; it will not implement versions of these interfaces that are generic over System.ValueType or System.Object . This means that the dtArray variable cannot be passed as an argument to the M3 method shown earlier . The reason for this is because arrays of value types are laid out in memory differently than arrays of reference types . Array memory layout was discussed earlier in this chapter .
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Passing and Returning Arrays
When passing an array as an argument to a method, you are really passing a reference to that array . Therefore, the called method is able to modify the elements in the array . If you don t want to allow this, you must make a copy of the array and pass the copy into the method . Note that the Array.Copy method performs a shallow copy, and therefore, if the array s elements are reference types, the new array refers to the already existing objects . Similarly, some methods return a reference to an array . If the method constructs and initializes the array, returning a reference to the array is fine . But if the method wants to return a reference to an internal array maintained by a field, you must decide if you want the method s caller to have direct access to this array and its elements . If you do, just return the array s reference . But most often, you won t want the method s caller to have such access, so the method should construct a new array and call Array.Copy, returning a reference to the new array . Again, be aware that Array.Copy makes a shallow copy of the original array . If you define a method that returns a reference to an array, and if that array has no elements in it, your method can return either null or a reference to an array with zero elements in it . When you re implementing this kind of method, Microsoft strongly recommends that you implement the method by having it return a zero-length array because doing so simplifies the code that a developer calling the method must write . For example, this easy-to-understand code runs correctly even if there are no appointments to iterate over:
// This code is easier to write and understand. Appointment[] appointments = GetAppointmentsForToday(); for (Int32 a = 0; a < appointments.Length; a++) { ... }
The following code also runs correctly if there are no appointments to iterate over . However, this code is slightly more difficult to write and understand:
16 Arrays
// This code is harder to write and understand. Appointment[] appointments = GetAppointmentsForToday(); if (appointments != null) { for (Int32 a = 0, a < appointments.Length; a++) { // Do something with appointments[a] } }
If you design your methods to return arrays with zero elements instead of null, callers of your methods will have an easier time working with them . By the way, you should do the same for fields . If your type has a field that s a reference to an array, you should consider having the field refer to an array even if the array has no elements in it .
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