Closures

gistfile1.txt

		int i = 1;
		Action<string> x = s => Console.WriteLine("i = {0}, s = '{1}'", i, s);
		
		x("Hello, World");
		i = 2;
		x("Hello, World");
    
    
    IL:
    
IL_0000:  nop         
IL_0001:  newobj      UserQuery+<>c__DisplayClass0_0..ctor
IL_0006:  stloc.0     // CS$<>8__locals0
IL_0007:  nop         
IL_0008:  ldloc.0     // CS$<>8__locals0
IL_0009:  ldc.i4.1    
IL_000A:  stfld       UserQuery+<>c__DisplayClass0_0.i
IL_000F:  ldloc.0     // CS$<>8__locals0
IL_0010:  ldftn       UserQuery+<>c__DisplayClass0_0.<Main>b__0
IL_0016:  newobj      System.Action<System.String>..ctor
IL_001B:  stloc.1     // x
IL_001C:  ldloc.1     // x
IL_001D:  ldstr       "Hello, World"
IL_0022:  callvirt    System.Action<System.String>.Invoke
IL_0027:  nop         
IL_0028:  ldloc.0     // CS$<>8__locals0
IL_0029:  ldc.i4.2    
IL_002A:  stfld       UserQuery+<>c__DisplayClass0_0.i
IL_002F:  ldloc.1     // x
IL_0030:  ldstr       "Hello, World"
IL_0035:  callvirt    System.Action<System.String>.Invoke
IL_003A:  nop         
IL_003B:  br.s        IL_003D
IL_003D:  ret         

<>c__DisplayClass0_0.<Main>b__0:
IL_0000:  ldstr       "i = {0}, s = '{1}'"
IL_0005:  ldarg.0     
IL_0006:  ldfld       UserQuery+<>c__DisplayClass0_0.i
IL_000B:  box         System.Int32
IL_0010:  ldarg.1     
IL_0011:  call        System.Console.WriteLine
IL_0016:  nop         
IL_0017:  ret         

<>c__DisplayClass0_0..ctor:
IL_0000:  ldarg.0     
IL_0001:  call        System.Object..ctor
IL_0006:  nop         
IL_0007:  ret         


IL release mode:

IL_0000:  newobj      UserQuery+<>c__DisplayClass0_0..ctor
IL_0005:  dup         
IL_0006:  ldc.i4.1    
IL_0007:  stfld       UserQuery+<>c__DisplayClass0_0.i
IL_000C:  dup         
IL_000D:  ldftn       UserQuery+<>c__DisplayClass0_0.<RunUserAuthoredQuery>b__0
IL_0013:  newobj      System.Action<System.String>..ctor
IL_0018:  stloc.0     // x
IL_0019:  ldloc.0     // x
IL_001A:  ldstr       "Hello, World"
IL_001F:  callvirt    System.Action<System.String>.Invoke
IL_0024:  ldc.i4.2    
IL_0025:  stfld       UserQuery+<>c__DisplayClass0_0.i
IL_002A:  ldloc.0     // x
IL_002B:  ldstr       "Hello, World"
IL_0030:  callvirt    System.Action<System.String>.Invoke
IL_0035:  ret         

<>c__DisplayClass0_0.<RunUserAuthoredQuery>b__0:
IL_0000:  ldstr       "i = {0}, s = '{1}'"
IL_0005:  ldarg.0     
IL_0006:  ldfld       UserQuery+<>c__DisplayClass0_0.i
IL_000B:  box         System.Int32
IL_0010:  ldarg.1     
IL_0011:  call        System.Console.WriteLine
IL_0016:  ret         

<>c__DisplayClass0_0..ctor:
IL_0000:  ldarg.0     
IL_0001:  call        System.Object..ctor
IL_0006:  ret