拳击参考类型（类）？

Question

我有这个非常简单的属性（这是一个使用Prism Notifications and Interactions的WPF项目）

public bool ConfirmNavigation
{
    get { return _confirmNavigation; }
    set { _confirmNavigation = value; base.RaisePropertyChanged<bool>(() => ConfirmNavigation); }
}

生成的IL显示如下。令我困惑的是这条线 -   IL_000a：框MyNamespace.MyClass MyClass是class，不是 a struct。是什么给了什么？

.property instance bool ConfirmNavigation()

.get instance bool MyNamespace.MyClass::get_ConfirmNavigation()
{
    .locals init (
        [0] bool CS$1$0000
    )

    IL_0000: nop
    IL_0001: ldarg.0
    IL_0002: ldfld bool MyNamespace.MyClass::_confirmNavigation
    IL_0007: stloc.0
    IL_0008: br.s IL_000a

    IL_000a: ldloc.0
    IL_000b: ret
}
.set instance void MyNamespace.MyClass::set_ConfirmNavigation(bool)
{
    IL_0000: nop
    IL_0001: ldarg.0
    IL_0002: ldarg.1
    IL_0003: stfld bool MyNamespace.MyClass::_confirmNavigation
    IL_0008: ldarg.0
    IL_0009: ldarg.0
    ***IL_000a: box MyNamespace.MyClass***
    IL_000f: ldtoken MyNamespace.MyClass
    IL_0014: call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle)
    IL_0019: call class [System.Core]System.Linq.Expressions.ConstantExpression [System.Core]System.Linq.Expressions.Expression::Constant(object,  class [mscorlib]System.Type)
    IL_001e: ldtoken method instance bool MyNamespace.MyClass::get_ConfirmNavigation()
    IL_0023: call class [mscorlib]System.Reflection.MethodBase [mscorlib]System.Reflection.MethodBase::GetMethodFromHandle(valuetype [mscorlib]System.RuntimeMethodHandle)
    IL_0028: castclass [mscorlib]System.Reflection.MethodInfo
    IL_002d: call class [System.Core]System.Linq.Expressions.MemberExpression [System.Core]System.Linq.Expressions.Expression::Property(class [System.Core]System.Linq.Expressions.Expression,  class [mscorlib]System.Reflection.MethodInfo)
    IL_0032: ldc.i4.0
    IL_0033: newarr [System.Core]System.Linq.Expressions.ParameterExpression
    IL_0038: call class [System.Core]System.Linq.Expressions.Expression`1<class [mscorlib]System.Func`1<bool>> [System.Core]System.Linq.Expressions.Expression::Lambda<class [mscorlib]System.Func`1<bool>>(class [System.Core]System.Linq.Expressions.Expression,  class [System.Core]System.Linq.Expressions.ParameterExpression[])
    IL_003d: call instance void [Microsoft.Practices.Prism]Microsoft.Practices.Prism.ViewModel.NotificationObject::RaisePropertyChanged<bool>(class [System.Core]System.Linq.Expressions.Expression`1<class [mscorlib]System.Func`1<bool>>)
    IL_0042: nop
    IL_0043: ret
}