C#中接口是值类型还是引用类型?

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//测试代码
    internal interface ITest1
   {
       void Test1();
   }
   class A:ITest1
   {
       public void Test1(){}
   }
   struct B:ITest1
   {
       public void Test1(){}
   }
   static class  App
   {
       public static int Main()
       {
           ITest1 a, b;
           A class_a = new A();
           B struct_b = new B();
           Console.WriteLine(struct_b);
           Console.WriteLine(class_a);
           a = class_a;
           b = struct_b;
           Console.WriteLine(b);
           Console.WriteLine(a);
           return 0;
       }
   }

  

IL代码,可以很明确的看出接口是引用类型

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.method public hidebysig static
        int32 Main () cil managed
    {
        // 方法起始 RVA 地址 0x2060
        // 方法起始地址(相对于文件绝对值:0x0260)
        // 代码长度 65 (0x41)
        .maxstack 1
        .entrypoint
        .locals init (
            [0] class CSharp1.ITest1,、、、、
            [1] class CSharp1.ITest1,、
            [2] class CSharp1.A,
            [3] valuetype CSharp1.B,K
            [4] int32
        )
 
        // 0x026C: 00
        IL_0000: nop
        // 0x026D: 73 03 00 00 06
        IL_0001: newobj instance void CSharp1.A::.ctor()
        // 0x0272: 0C
        IL_0006: stloc.2
        // 0x0273: 12 03
        IL_0007: ldloca.s 3
        // 0x0275: FE 15 04 00 00 02
        IL_0009: initobj CSharp1.B
        // 0x027B: 09
        IL_000f: ldloc.3
        // 0x027C: 8C 04 00 00 02
        IL_0010: box CSharp1.B//装箱操作
        // 0x0281: 28 06 00 00 0A
        IL_0015: call void [mscorlib]System.Console::WriteLine(object)
        // 0x0286: 00
        IL_001a: nop
        // 0x0287: 08
        IL_001b: ldloc.2
        // 0x0288: 28 06 00 00 0A
        IL_001c: call void [mscorlib]System.Console::WriteLine(object)
        // 0x028D: 00
        IL_0021: nop
        // 0x028E: 08
        IL_0022: ldloc.2
        // 0x028F: 0A
        IL_0023: stloc.0
        // 0x0290: 09
        IL_0024: ldloc.3
        // 0x0291: 8C 04 00 00 02
        IL_0025: box CSharp1.B
        // 0x0296: 0B
        IL_002a: stloc.1
        // 0x0297: 07
        IL_002b: ldloc.1
        // 0x0298: 28 06 00 00 0A
        IL_002c: call void [mscorlib]System.Console::WriteLine(object)
        // 0x029D: 00
        IL_0031: nop
        // 0x029E: 06
        IL_0032: ldloc.0
        // 0x029F: 28 06 00 00 0A
        IL_0033: call void [mscorlib]System.Console::WriteLine(object)
        // 0x02A4: 00
        IL_0038: nop
        // 0x02A5: 16
        IL_0039: ldc.i4.0
        // 0x02A6: 13 04
        IL_003a: stloc.s 4
        // 0x02A8: 2B 00
        IL_003c: br.s IL_003e
 
        // 0x02AA: 11 04
        IL_003e: ldloc.s 4
        // 0x02AC: 2A
        IL_0040: ret
    } // 方法 App::Main 结束DS

  

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