C#編譯器對於dynamic對象到底做了什麼

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private static void TestMethod(){            //dynamic 僅僅是個預留位置而已            dynamic p1 = new { X = 1, Y = 89 };            //對dynamic對象p1的X屬性訪問通過CallSite來實現，並且CallSite可以Cache            object p1x = p1.X;            object p1y = p1.Y;            //dynamic 僅僅是個預留位置而已            dynamic p2 = new { X = 1, Y = 89, Z = 3 };            object p2x = p2.X;            object p2y = p2.Y;            object p2z = p2.Z;}

對於如上所示的含有dynamic調用的C#方法編譯後大致的結果如下：

using System;using Microsoft.CSharp.RuntimeBinder;using System.Runtime.CompilerServices;private static void TestMethod(){    object p1 = new {        X = 1,        Y = 0x59    };        if (TestMethod_SiteContainer.p_Sitea == null)    {        TestMethod_SiteContainer.p_Sitea = CallSite<Func<CallSite, object, object>>.Create(Binder.GetMember(CSharpBinderFlags.None, "X", typeof(Program), new CSharpArgumentInfo[] { CSharpArgumentInfo.Create(CSharpArgumentInfoFlags.None, null) }));    }    object p1x = TestMethod_SiteContainer.p_Sitea.Target(TestMethod_SiteContainer.p_Sitea, p1);        if (TestMethod_SiteContainer.p_Siteb == null)    {        TestMethod_SiteContainer.p_Siteb = CallSite<Func<CallSite, object, object>>.Create(Binder.GetMember(CSharpBinderFlags.None, "Y", typeof(Program), new CSharpArgumentInfo[] { CSharpArgumentInfo.Create(CSharpArgumentInfoFlags.None, null) }));    }    object p1y = TestMethod_SiteContainer.p_Siteb.Target(TestMethod_SiteContainer.p_Siteb, p1);        object p2 = new {        X = 1,        Y = 0x59,        Z = 3    };        if (TestMethod_SiteContainer.p_Sitec == null)    {        TestMethod_SiteContainer.p_Sitec = CallSite<Func<CallSite, object, object>>.Create(Binder.GetMember(CSharpBinderFlags.None, "X", typeof(Program), new CSharpArgumentInfo[] { CSharpArgumentInfo.Create(CSharpArgumentInfoFlags.None, null) }));    }    object p2x = TestMethod_SiteContainer.p_Sitec.Target(TestMethod_SiteContainer.p_Sitec, p2);        if (TestMethod_SiteContainer.p_Sited == null)    {        TestMethod_SiteContainer.p_Sited = CallSite<Func<CallSite, object, object>>.Create(Binder.GetMember(CSharpBinderFlags.None, "Y", typeof(Program), new CSharpArgumentInfo[] { CSharpArgumentInfo.Create(CSharpArgumentInfoFlags.None, null) }));    }    object p2y = TestMethod_SiteContainer.p_Sited.Target(TestMethod_SiteContainer.p_Sited, p2);        if (TestMethod_SiteContainer.p_Sitee == null)    {        TestMethod_SiteContainer.p_Sitee = CallSite<Func<CallSite, object, object>>.Create(Binder.GetMember(CSharpBinderFlags.None, "Z", typeof(Program), new CSharpArgumentInfo[] { CSharpArgumentInfo.Create(CSharpArgumentInfoFlags.None, null) }));    }    object p2z = TestMethod_SiteContainer.p_Sitee.Target(TestMethod_SiteContainer.p_Sitee, p2);}[CompilerGenerated]private static class TestMethod_SiteContainer{    // Fields    public static CallSite<Func<CallSite, object, object>> p_Sitea;    public static CallSite<Func<CallSite, object, object>> p_Siteb;    public static CallSite<Func<CallSite, object, object>> p_Sitec;    public static CallSite<Func<CallSite, object, object>> p_Sited;    public static CallSite<Func<CallSite, object, object>> p_Sitee;}

 

C#編譯器對於dynamic對象到底做了什麼