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Addition and subtraction operators are now supported for System.IntPtr and System.UIntPtr. Add()() and Subtract() methods have also been added to these types.
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Tail Recursion
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The CLR contains support for tail recursion, although this is only currently accessible through F#.
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Changes to Existing Functionality
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.NET 4.0 enhances a number of existing commonly used methods and classes.
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Action and Func Delegates
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Action and Func delegates now can accept up to 16 generic parameters, which might result in unreadable code. This reminds me of an API that a health care provider (who shall remain nameless) gave me that had a method with more than 70 ( !) parameters.
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Compression Improvements
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The 4 GB size limit has been removed from System.IO.Compression methods. The compression methods in DeflateStream and GZipStream do not try to compress already compressed data, resulting in better performance and compression ratios.
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CLR AND BCL CHANGES
File IO
.NET 4.0 introduces a new method to the File class called File.ReadLines()(), which returns IEnumerable<string> rather than a string array. Reading a file one line at a time is much more efficient than loading the entire contents into memory (File.ReadAllLines()). This technique also has the advantage that you can start working with a file immediately and bail out of the loop when you find what you are looking for without having to read the entire file. ReadLines()() is now the preferred method for working with very large files. IEnumerable<string> FileContent=File.ReadLines("MyFile.txt"); foreach(string Line in FileContent) { Console.Write(Line); } File.WriteAllLines()() and File.AppendAllLines()() now take an IEnumerable<string> as an input parameter. System.IO.Directory has the following new static methods that return IEnumerable<string>: EnumerateDirectories(path) EnumerateFiles(path) EnumerateFileSystemEntries(path)
System.IO.DirectoryInfo has the following new static methods: EnumerateDirectories(path) returns IEnumerable<DirectoryInfo> EnumerateFiles(path) returns IEnumerable<FileInfo> EnumerateFileSystemInfos(path) returns IEnumerable<FileSystemInfo>
Enumerating files within a directory is also now more efficient than previously because file metadata such as a creation date is queried during enumeration. This means that Windows API calls should be unnecessary because the information is already retrieved.
Path.Combine()
The Path.Combine() method has new overloads that accept three and four parameters and an array of strings.
Isolated Storage
The default space allocation for isolated storage has now been doubled.
Registry Access Changes
The RegistryKey.CreateSubKey() method has a new option that allows the passing in of a RegistryOptions enumeration, allowing you to create a volatile registry key. Volatile registry keys are not persisted during reboots, so they are great for storing temporary data in. The following code shows how to create a volatile registry key:
CLR AND BCL CHANGES
var key = instance.CreateSubKey(subkey, RegistryKeyPermissionCheck.Default, RegistryOptions.Volatile); In 64-bit versions of Windows, data is stored separately in the registry for 32- and 64-bit applications. OpenBaseKey()() and OpenRemoteBaseKey() methods now allow you to specify a new enum called RegistryView for specifying the mode that should be used when reading. Note that if you mistakenly use the 64-bit option on a 32-bit version, you will get the 32-bit view.
Stream.CopyTo()
Stream.CopyTo() allows you to copy the contents of one stream to another, avoiding some tedious coding: MemoryStream destinationStream = new MemoryStream(); using (FileStream sourceStream = File.Open(@"c:\temp.txt", FileMode.Open)) { sourceStream.CopyTo(destinationStream); }
Guid.TryParse(), Version.TryParse(), and Enum.TryParse<T>()
New TryParse() methods have been added to Guid, Version and Enum types: Guid myGuid; Guid.TryParse("not a guid", out myGuid);
Enum.HasFlag()
Returns a Boolean value indicating whether one or more flags are set on an enum. For example, you could use the HasFlag() method to test whether a car has particular options set: [Flags] public enum CarOptions { AirCon = 1, Turbo = 2, MP3Player = 4 } static void Main(string[] args) { CarOptions myCar = CarOptions.MP3Player | CarOptions.AirCon | CarOptions.Turbo; Console.WriteLine("Does car have MP3 {0}", myCar.HasFlag(CarOptions.MP3Player)); Console.ReadKey(); }
CLR AND BCL CHANGES
String.Concat() and String.Join() support IEnumerable<T>
New overloads allow the concatenation and joining of IEnumerable elements without having to convert them to strings first, which can make LINQ queries cleaner.
String.IsNullOrWhiteSpace()
Detects if a string is null, empty, or consists of whitespace characters (avoiding a call to Trim()): String.IsNullOrWhiteSpace(" "); This is one of my favorite changes. It is such a common thing to do that it is great to have it baked into the framework.
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