This document summarizes the standard classes in the C# library. It covers common collections like lists and dictionaries, generics, nullable types, file and stream handling, serialization, date and time functions, regular expressions, and math functions. The main classes covered include Collections, Path, DriveInfo, Directory, File, Streams, DateTime, Regex, and Math. Usage examples and links to documentation are provided for each topic.

1. Стандартна
бібліотека класів c#

2. Зміст
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Колекції. System.Collections, System.Collections.Generic.
Що таке Generic? Extension methods.
Nullable<T>, “type?”
Path
DriveInfo
Directory
File
Streams
Serializationdeserializations
Encodings
DateTime, TimeSpan
Regex
Math

3. Collections
Collections:
• Hashtable
• ArrayList
• Queue
• Stack
Collections.Generic:
• Dictionary<TKey, TValue>
• List<T>
• Queue<T>
• Stack<T>
• LinkedList<T>
http://msdn.microsoft.com/en-us/library/system.collections.aspx - Collections
http://msdn.microsoft.com/en-us/library/0sbxh9x2.aspx - Collections.Generic

4. Generics
• Generic methods:
• FirstOrDefault<T>(T[] array)
• FirstOrDefault<T>(T[] array, T defaultValue)
• Type inference:
• int first = FirstOrDefault(new[] {3, 2, 1});
• default(T) expression
• Type constraints:
• Base type, class, struct, new()
• Generic types:
• Example: List<T>
http://msdn.microsoft.com/en-us/library/ms379564(v=vs.80).aspx

5. Extension methods
Simply static methods
Used for convenience
http://msdn.microsoft.com/en-us/library/bb383977.aspx

6. Nullable<T>
int? = Nullable<int>
Useful properties:
• HasValue
• Value
http://msdn.microsoft.com/en-us/library/b3h38hb0.aspx

7. Path
• Path.Combine(path1, path2)
• Path.GetDirectoryName(path)
• Path.GetFileName(path)
• Path.GetExtension(path)
• Path.GetFullPath(path)
• Path.GetRandomFileName()
• Path.GetTempFileName()
• Path.GetTempPath()
http://msdn.microsoft.com/en-us/library/system.io.path_methods.aspx

8. DriveInfo
• DriveInfo.GetDrives()
• drive.DriveType {CDRom, Fixed, Unknown, Network, Removable ….}
• drive.DriveFormat {NTFS, FAT32}
• drive. AvailableFreeSpace
http://msdn.microsoft.com/en-us/library/system.io.driveinfo.aspx

9. Directory
• Directory.Create(folderPath)
• Directory.Move(folderPath, destinationPath)
• Directory.Delete(folderPath) && Directory.Delete(folderPath, true/*recursive*/)
• Directory.Exists(folderPath)
• Directory.GetFiles(folderPath, [search pattern])
http://msdn.microsoft.com/en-us/library/system.io.directory.aspx

10. File
• File.Create(filePath)
• File.Move(filePath, filePathDestination)
• File.Copy(filePath, filePathDestination)
• File.Delete(filePath)
• File.Exists(filePath)
• File.WriteAllText(filePath, text)
• File.WriteAllBytes(filePath, bytes)
• File.AppendText(filePath, text)
• File.ReadAllText(filePath)
• File.ReadAllBytes(filePath)
http://msdn.microsoft.com/en-us/library/system.io.file.aspx

11. Streams
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stream.Read(data, offset, count)
stream.Write(data, offset, count)
stream.Length
stream.Seek(offset, SeekOrigin)
stream.Close()
Stream
CryptoStream
MemoryStream
FileStream
• StreamWriter – easy way to write into text files.
• StreamReader – easy way to read text from files.
• FileStream – easy way to work with binary files.
Create FileStream:
• constructor (new FileStream(path, FileMode, FileAccess))
• File.Create
• File.Open
• File.Write
http://msdn.microsoft.com/en-us/library/system.io.stream.aspx - Stream
http://msdn.microsoft.com/en-us/library/system.io.filestream.aspx - FileStream

12. Binary serialization
[Serializable]
public class MyObject
{
public int n1 = 0;
public int n2 = 0;
public String str = null;
}
Serizalization
MyObject obj = new MyObject();
obj.n1 = 1;
obj.n2 = 24;
obj.str = "Some String";
IFormatter formatter = new BinaryFormatter();
Stream stream = new FileStream("MyFile.bin", FileMode.Create, FileAccess.Write, FileShare.None);
formatter.Serialize(stream, obj);
stream.Close();
Deserizalization
IFormatter formatter = new BinaryFormatter();
Stream stream = new FileStream("MyFile.bin", FileMode.Open, FileAccess.Read, FileShare.Read);
MyObject obj = (MyObject)formatter.Deserialize(stream);
stream.Close();
http://msdn.microsoft.com/en-us/library/72hyey7b(v=vs.80).aspx

13. XML serialization
public class MyObject
{
public int n1 = 0;
public int n2 = 0;
public String str = null;
}
Serizalization
MyObject obj = new MyObject();
obj.n1 = 1;
obj.n2 = 24;
obj.str = "Some String";
XmlSerializer serializer = new XmlSerializer(typeof(MyObject));
Stream stream = new FileStream("MyFile.bin", FileMode.Create, FileAccess.Write, FileShare.None);
serializer.Serialize(stream, obj);
stream.Close();
Deserizalization
XmlSerializer serializer = new XmlSerializer(typeof(MyObject));
Stream stream = new FileStream("MyFile.bin", FileMode.Open, FileAccess.Read, FileShare.Read);
MyObject obj = (MyObject)serializer.Deserialize(stream);
stream.Close();
http://msdn.microsoft.com/en-us/library/90c86ass(v=vs.80).aspx

14. DateTime
• DateTime – представляє значення дати та часу.
• DateTime.Add(timeSpan)
• DateTime.AddDay(number)….
• DateTime.ToString(format) (hh:mm:ss)
• ToLocalTime()
• ToUniversalTime()
• DateTime.Now
• DateTime.UtcNow
• …
• TimeSpan – представляє інтервали дати та часу.
• TimeSpan.TotalMilliseconds
• TimeSpan.Days
• TimeSpan.TotalDays
• …
http://msdn.microsoft.com/en-us/library/system.datetime.aspx - DateTime
http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx - Custom DateTime Formats

15. Encoding
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Encoding.Default
Encoding.Unicode
Encoding.ASCII
Encoding.UTF32
…
Encoding.Convert(sourceEncoding, destinationEncoding, bytes)
• encoding.GetBytes(string)
• encoding.GetString(bytes)
http://msdn.microsoft.com/en-us/library/system.text.encoding.aspx

16. Regex
Email pattern: “b[A-Z0-9._%-]+@[A-Z0-9.-]+.[A-Z]{2,4}b”
• Regex.IsMatch(pattern, string)
• Regex.Replace(pattern, string, newValue)
http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex.aspx

17. Math
• Math.Abs(number)
• Math.Pow(number)
• Math.Sin(angle)
• Math.Cos(angle)
• Math.Max(number1, number2)
• Math.Min(number1, number2)
• …
http://msdn.microsoft.com/en-us/library/system.math.aspx