Download presentation
Presentation is loading. Please wait.
Published byDustin Underwood Modified over 9 years ago
1
Uvod v C# Drugi del
2
Dedovanje
3
Sintaksa
4
Prirejanje in preverjanje tipov
5
Kaste preverjenih tipov
6
Prekrivanje metod
7
Dinamično povezovanje (poenostavljeno)
8
Skrivanje
9
Dinamično povezovanje (s skrivanjem)
10
Fragile base class problem
11
Konstruktorji in dedovanje
12
Vidnost protected in internal
13
Abstraktni razredi
14
Abstraktne lastnosti in indekserji
15
Zapečateni razredi
16
Vmesniki (interfaces)
17
Sintaksa
18
Implementacija vmesnikov
19
Delo z vmesniki
20
Primer
21
Delegati in dogodki
22
Delegati Delegates are reference types which allow indirect calls to methods. A delegate instance holds references to some number of methods, and by invoking the delegate one causes all of these methods to be called. The usefulness of delegates lies in the fact that the functions which invoke them are blind to the underlying methods they thereby cause to run (see, for instance, the discussion of events, below).
23
Delegati From this brief description, it can be seen that delegates are functionally rather similar to C++'s 'function pointers'. However, it is important to bear in mind two main differences. Firstly, delegates are reference types rather than value types. Secondly, some single delegates can reference multiple methods
24
Delegate Declaration and Instantiation 1.1. public void realMethod (String myString)public void realMethod (String myString) 2.2. { 3.3. // method code // method code 4.4. } Each delegate is limited to referencing methods of a particular kind only. The type is indicated by the delegate declaration - the input parameters and return type given in the delegate declaration must be shared by the methods its delegate instances reference. To illustrate this: a delegate specified as below can be used to refer only to methods which have a single String input and no return value: public delegate void Print (String s);
25
Suppose, for instance, that a class contains the following method: public void realMethod (String myString) { // method code } Another method in this class could then instantiate the 'Print' delegate in the following way, so that it holds a reference to 'realMethod': Print delegateVariable = new Print(realMethod);
26
Razredi - dogodki Jezikovna podpora dogodkom Ključna beseda event nam omogoča določiti delegata, ki bo ustrezal poklicanim metodam ob nastopu nekega dogodka. public event AlarmEventHandler Alarm; Dogodek sprožimo s klicem dogodka Alarm(); Odjemalci se prijavijo na dogodek z operatorjem += eventSource.Alarm += new AlarmEventHandler(eventListener.AlarmRang);
27
Deklaracija delegata, prireditev metode delegatu
28
Prirejanje različnih metod
29
Creating a delegate value
30
Multicast delegati
31
Events = Special Delegate Variables
32
Izjeme (exceptions)
33
Stavek try
34
System.Exception
35
Throwing an Exception
36
Hierarhija izjem
37
Searching for a catch Clause
38
No Throws Clause in Method Signature
39
Namespaces and Assemblies
40
C# Namespaces vs. Java Packages
41
Namespaces vs. Packages (continued)
42
Assemblies
43
Kako se tvorijo assemblies
44
Opcije prevajalnika
46
Primeri prevajanj
47
Atributi
48
Atributi so deklarativni elementi jezika –pridevniki so na primer tudi deklarativni elementi –omogočajo dekoracijo elementov kode z dodatno informacijo assembly, modul, tip, član tipa, return value, parameter Atributi posplošujejo koncept deklarativnega elementa –atributi niso omejeni na vnaprej določeno množico –lahko se zmišljujemo svoje nove atribute –atributi in njihove vrednosti so dosegljivi v času prevajanja in v času izvajanja [Obsolete("This class is obsolete")] class A { public void F() {} }
49
Atributi
50
Atribut s parametri
51
Atributi Nekateri vnaprej definirani atributi Ime atributaOpis Browsable Vključenost lastnosti v okno lastnosti Serializable Določa naj bo razred ali struktura serializabilna Obsolete Določa, da je nek element kode zastarel Conditional Določa vključenost metode v odvisnosti od predproc. simbola
52
Atributi Zgled uporabe atributa Conditional #define Debug public class Debug { [Conditional("Debug")] public static void Assert(bool cond, String s) { if (!cond) { throw new AssertionException(s); } void DoSomething() {... // If Debug is not defined, the next line is // not even called Assert((x == y), “X should equal Y”);... }
53
Še en primer: atribut Conditional
54
Tvoji lastni atributi
55
Niti (threads)
56
Sodelujoče niti (participating threads)
57
Primer
58
Stanja niti
59
Primer za Join
60
Medsebojno izobčenje (sinhronizacija)
61
Razred Monitor
62
Wait in Pulse
63
Primer: sinhroniziran medpomnilnik
64
Komentarji XML
65
Posebni komentarji (podobno javadoc)
66
Primer komentirane kode
67
Tvorjena XML datoteka
68
XML oznake (XML tags)
69
Povzetek C#
70
Odprtokodni c# MCS: The Ximian C# compiler The Mono C# compiler is considered feature C# 1.0 complete at this point and mature. MCS is able to compile itself and many more C# programs (there is a test suite included that you can use). It is routinely used to compile Mono, roughly 1.7 million lines of C# code. The compiler is also fairly fast. On a IBM ThinkPad t40 it compiles 18,000 lines of C# code per second. Work on C# 2.0 has started: some pieces of it are available on the standard compiler with the -2 switch (iterators, method conversions) and some others are available on the `gmcs' branch on CVS (generics) Obtaining MCS The Mono C# compiler is part of the `mcs' module in the Mono CVS you can get it from our Anonymous CVS server, or you can get nightly download page.Anonymous CVSdownload page
71
Mono razhroščevalnik
72
Eclipse in mono
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.