???????????????????????????????Щ???????????????????????????????????Щ????????????????????????????????
????????ζ????Щ?????????????д???????????????????????????enjoy
????yield
????yield???????????????????????????????????????????????????????????????????????????????????yield??return????????????????????????????????????????foreach???????????????yield????????????????????
????public classList
????{
????//using System.Collections;
????public static IEnumerable Power(int number??int exponent)
????{
????int counter=0;
????int result=1;
????while(counter++<exponent)
????{
????result=result*number;
????yield return result;
????}
????}
????static void Main()
????{
????//Display powers of 2 up to the exponent 8:
????foreach(int i in Power(2??8))
????{
????Console.Write("{0}"??i);
????}
????}
????}
????/*
????Output:
????2 4 8 16 32 64 128 256
????*/
????MSDN?????http://msdn.microsoft.com/en-us/library/9k7k7cf0.aspx
????var
???????C#3.0?????????????t??Χ??????????????????var??????????????????????????????????????????????????????????????????????????????????????????
??????2.0?汾????????????????var???????????????????????3.0????汾???????????????汾?2.0:
????var i=10;//implicitly typedint i=10;//explicitly typed
????MSDN????:http://msdn.microsoft.com/en-us/library/bb383973.aspx
????using()
?????????????Χ?????Χ?????????????
????using(C c=new C())
????{
????c.UseLimitedResource();
????}
????MSDN?????http://msdn.microsoft.com/en-us/library/yh598w02%28VS.80%29.aspx
????readonly
????readonly?????????????????????????????η??????????????readonly???κ?????????????????????????????????????????????
????MSDN?????http://msdn.microsoft.com/en-us/library/acdd6hb7%28VS.80%29.aspx
????as
????as????????????????????????????????????????????????????????????????as????null??????????????:
????class Class1{}
????classClass2{}
????classClass3:Class2{}
????classIsTest
????{
????static voidTest(objecto)
????{
????Class 1a;
????Class 2b;
????if(o isClass1)
????{
????Console.WriteLine("o is Class1");
????a=(Class1)o;
????//Do something with"a."
????}
????else if(o is Class2)
????{
????Console.WriteLine("o is Class2");
????b=(Class2)o;
????//Do something with"b."
????}
????else
????{
????Console.WriteLine("o is neither Class1 nor Class2.");
????}
????}
????static void Main()
????{
????Class1 c1=new Class1();
????Class2 c2=new Class2();
????Class3 c3=new Class3();
????Test(c1);
????Test(c2);
????Test(c3);
????Test("a string");
????}
????}
????/*
????Output:
????o is Class1
????o is Class2
????o is Class2
????o is neither Class1 nor Class2.
????*/
????MSDN?????http://msdn.microsoft.com/en-us/library/scekt9xw.aspx
????default
???????????????????в????????????????????δ?????????????ν????????????????????T??
????T???????????????????
???????T???????????????????????
??????????????????T?????????t????е?T???????????????t=null????Ч????е?T????????????????????t=0??????????á?????????????default??????????????????????????null????????????????????????????????????????????null???????????????????????Щ????????????????????:
????T temp=default(T);
????MSDN????:http://msdn.microsoft.com/en-us/library/xwth0h0d.aspx
????global
???????::????????????global????????????????????????????????????κ?C#???????????????δ???????????????
????class TestClass:global::TestApp{}
????MSDN????:http://msdn.microsoft.com/en-us/library/cc713620.aspx
????volatile
????volatile?????????ο??????????????????????????volatile????β??????????????????????????????????????????????????????κ????????????μ????
????MSDN????:http://msdn.microsoft.com/en-us/library/x13ttww7%28VS.80%29.aspx
????extern alias
????????????б?????t??????????????????????????????汾?????統(tǒng)?????????ó???????ó???????????????汾???????????????????????????????????????????????????????????????????????????????????????????á?
?????????????????????????????????????????????????????????????????????????
????/r:GridV1=grid.dll
????/r:GridV2=grid20.dll
?????????????????GridV1????GridV2?????????????????Щ???????????extern?????????????????磺
????extern alias GridV1;
????extern alias GridV2;
????????????????????????????????????????????????????????????У??????????????????????????????????????????????????????????????????????????????????????????????????????????
???????????????У?GridV1::Grid??????grid.dll????????????GridV2::Grid??????grid20.dll??????????