關于“.WriteLine()是否需要這么多重載”的筆記

1 public static void WriteLine(string format, params object[] arg);2 public static void WriteLine(string format, object arg0);3 public static void WriteLine(string format, object arg0, object arg1);4 public static void WriteLine(string format, object arg0, object arg1, object arg2);5 public static void WriteLine(string format, object arg0, object arg1, object arg2, object arg3);

delegate void E(string format, object o1);E e = Console.WriteLine;

如在之后按params重載的思路，使用e("{0}, {1}", "a", "b")將無法編譯通過。對于指定參數的委托，如需要使用到WriteLine，非params的重載是應該存在的；

2.　　并非所有的CLI都支持params的語法；

3.　　從性能的角度來說，每次調用public static void WriteLine(string format, params object[] arg)，都將分配托管堆空間用于存儲對象，哪怕是如下代碼：

static void Main(string[] args){       DemoFunc("a", "b", "c");       DemoFunc("a", "b", "c");}public static void DemoFunc(params string[] val){}

.method PRivate hidebysig static void  Main(string[] args) cil managed{  .entrypoint  // 代碼大小       78 (0x4e)  .maxstack  3  .locals init ([0] string[] CS$0$0000)  IL_0000:  nop  IL_0001:  ldc.i4.3  IL_0002:  newarr     [mscorlib]System.String  IL_0007:  stloc.0  IL_0008:  ldloc.0  IL_0009:  ldc.i4.0  IL_000a:  ldstr      "a"  IL_000f:  stelem.ref  IL_0010:  ldloc.0  IL_0011:  ldc.i4.1  IL_0012:  ldstr      "b"  IL_0017:  stelem.ref  IL_0018:  ldloc.0  IL_0019:  ldc.i4.2  IL_001a:  ldstr      "c"  IL_001f:  stelem.ref  IL_0020:  ldloc.0  IL_0021:  call       void ConsoleapplicationDemo2.Program::DemoFunc(string[])  IL_0026:  nop  IL_0027:  ldc.i4.3  IL_0028:  newarr     [mscorlib]System.String  IL_002d:  stloc.0  IL_002e:  ldloc.0  IL_002f:  ldc.i4.0  IL_0030:  ldstr      "a"  IL_0035:  stelem.ref  IL_0036:  ldloc.0  IL_0037:  ldc.i4.1  IL_0038:  ldstr      "b"  IL_003d:  stelem.ref  IL_003e:  ldloc.0  IL_003f:  ldc.i4.2  IL_0040:  ldstr      "c"  IL_0045:  stelem.ref  IL_0046:  ldloc.0  IL_0047:  call       void ConsoleApplicationDemo2.Program::DemoFunc(string[])  IL_004c:  nop  IL_004d:  ret} // end of method Program::Main