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2.ÔÚ  readonly ºÍ const Ö®¼ä£¬ÓÅÏÈʹÓà readonly
3.ÔÚ as ºÍ Ç¿ÖÆÀàÐÍת»»Ö®¼ä£¬ÓÅÏÈʹÓà as ²Ù×÷·û
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5.×ÜÊÇΪ×Ô¶¨ÒåÀàÖØÔØ ToString ·½·¨
6.Çø±ðÖµÀàÐͺÍÒýÓÃÀàÐÍ
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8.ÔÚÖµÀàÐÍÖУ¬È·±£0ÊÇÒ»¸öºÏ·¨µÄÊý¾Ý
9.Àí½â ReferenceEquals, static Equals, instance Equals ºÍ ±È½ÏÔËËã·û(==)Ö®¼äµÄ¹Øϵ
10.Àí½â GetHashCode·½·¨µÄȱÏÝ
11.ÔÚ±àдѭ»·Ê±£¬ÓÅÏÈʹÓà foreach.
12.ÔÚ¶¨Òå±äÁ¿µÄʱºò¾Í½«Æä³õʼ»¯
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17.¾¡Á¿±ÜÃâʹÓÃ×°Ïä(boxing)ºÍ²ðÏä(unboxing)
18.ʵÏÖÀàµÄ Dispose ·½·¨
19.Ôڽӿںͼ̳Ð(Inheritance)Ö®¼ä£¬ÓÅÏÈʹÓýӿÚ(interface)
20.Çø·Ö½Ó¿ÚºÍÖØÔØ(overrides)
21.ÓÃίÍÐ(delegate)À´ÊµÏֻص÷(callback)
22.ÓÃʼþ(event)À´¶¨ÒåÍⲿ½Ó¿Ú
23.±ÜÃâ·µ»ØÀàÄÚ²¿³ÉÔ±µÄÒýÓÃ
24.ʹÓÃÔªÊý¾ÝÀ´¿ØÖƳÌÐò
25.ÓÅÏÈʹÓÿÉÐòÁл¯(serilizable)ÀàÐÍ
26.¶ÔÐèÒªÅÅÐòµÄ¶ÔÏóʵÏÖIComparableºÍIComparer½Ó¿Ú
27.±ÜÃâʹÓà ICloneable½Ó¿Ú
28.±ÜÃâʹÓÃÀàÐÍת»»²Ù×÷·û
29.Ö»Óе±»ùÀà¼ÓÈëÁËÓëÅÉÉúÀàÖÐÏÖÓеĺ¯ÊýÃû³ÆÏàͬµÄº¯Êýʱ£¬²ÅÐèҪʹÓà new ²Ù×÷·û
30.¾¡Á¿Ê¹Óà CLS-Compliant
31.¾¡Á¿±àд¶ÌÉÙ£¬¼òµ¥µÄº¯Êý
32.¾¡Á¿±àд±È½ÏСµÄ³ÌÐò¼¯(assembly)
33.ÏÞ¶¨ÀàÐ͵ĿɼûÐÔ(visibility)
34.±àд´óÁ£¶ÈµÄ web API
35.ÔÚʹÓÃʼþʱ£¬ÓÅÏȼ̳лùÀàʼþ£¬¶ø²»ÊÇÖØд´½¨Ò»¸öʼþ
36.¶àʹÓà framework µÄÔËÐÐʱµ÷ÊÔ (DEBUG, TRACE, EVENTLOGµÈ)
37.ʹÓÃ.net±ê×¼µÄÅäÖûúÖÆ
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42.ÀûÓÃÊôÐÔ(Attributes)
43.²»Òª¹ý¶ÈʹÓ÷´Éä(Reflection)
44.´´½¨ÍêÕûµÄ£¬Ó¦ÓóÌÐòÌض¨µÄÒì³£
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46.¾¡¿ÉÄÜÉÙµÄʹÓà Interop
47.¾¡Á¿Ê¹Óð²È«´úÂë (safe code)
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49.×¼±¸Ê¹Óà C# 2.0
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1 Ô­xmlÎļþ bookstore.xml
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<bookstore>
  <book ISBN="1234123">
    <title>who am i </title>
    <author>who</author>
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