Programming with C#

Costul operatorilor as is is static void Main(string[] args) { object obj = new string('s', 1); IsDemo(obj); AsDemo(obj); ExplicitDemo(obj); } static void IsDemo(object str) { string local = null; if (str is string) { local = (string)str; } } .method private hidebysig static void IsDemo(object str) cil managed { // Code size 29 (0x1d) .maxstack 2 .locals init ([0] string local, [1] bool CS$4$0000) IL_0000: nop IL_0001: ldnull IL_0002: stloc.0 IL_0003: ldarg.0 -- parametrul este incarcat si se testeaze daca este de tip System.String IL_0004: isinst [mscorlib]System.String IL_0009: ldnull -- se incarca pe stiva rezultatul operatiei IL_0004 > IL_0009 (in acest caz e 1) IL_000a: cgt.un IL_000c: ldc.i4.0 IL_000d: ceq -- se calculeaza IL_000a == IL_000a (adica 1 == 0) si se pastreaza rezultatul in loc.1 IL_000f: stloc.1 IL_0010: ldloc.1 -- daca este

using System; namespace Namespace { public interface IObject { void MyToString(); } public class MyObject : IObject { public void MyToString(){} } public class Program { static void SomeFunction(object a, object b, IObject c, MyObject d) { Int32 i = (int)a; MyObject obj_b = b as MyObject; MyObject obj_bb = (MyObject)b; IObject iobj_b = (IObject)b; MyObject obj_c = (MyObject)c; MyObject obj_cc = c as MyObject; IObject iobj_d = d as MyObject; IObject iobj_dd = d; IObject iobj_ddd = (MyObject)d; } static void Main(string[] args) { Int32 i = 3; MyObject myobj = new MyObject();

Sunt Adrian Iftode, programator .Net, cel putin asta fac 8 ore la serviciu. Acest blog va contine lucruri simple legate de programare cu limbajul C#.