Entity framework 为什么这两种匿名类型不一样？

有人能告诉我为什么这两种匿名类型不一样吗

{Name = "<>f__AnonymousType0`6" FullName = "<>f__AnonymousType0`6[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Decimal, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Double, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]"}

{Name = "<>f__AnonymousType0#1`6" FullName = "<>f__AnonymousType0#1`6[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Decimal, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Double, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]"}

{Name=“f_uanonymoustype0`6”FullName=“f_uanonymoustype0`6[[System.String，mscorlib，Version=4.0.0.0，Culture=中立，PublicKeyToken=b77a561934e089]，[System.String，mscorlib，Version=4.0.0.0.0，Culture=中立，PublicKeyToken=b77a561934e089]，[System.Int32，mscorlib，版本=4.0.0.0，区域性=中性，PublicKeyToken=b77a5c561934e089]，[System.Decimal，mscorlib，版本=4.0.0.0，区域性=中性，PublicKeyToken=b77a5c561934e089]，[System.Double，mscorlib，版本=4.0.0.0.0，区域性=中性，PublicKeyToken=b77a5c561934e089]。]
{Name=“f_uAnonymousType0#1`6”FullName=“f_uAnonymousType0#1`6[[System.String，mscorlib，Version=4.0.0.0，Culture=neutral，PublicKeyToken=b77a5c561934e089]，[System.String，mscorlib，Version=4.0.0.0.0，Culture=neutral，KeyToken=B77A5619B89]，[System.String，mscorlib，mscorlib，Version=4.0.0，Culture=neutral，KeyToken=B77A5619B89]，[System.Int32，mscorlib，版本=4.0.0.0，区域性=中性，PublicKeyToken=b77a5c561934e089]，[System.Decimal，mscorlib，版本=4.0.0.0，区域性=中性，PublicKeyToken=b77a5c561934e089]，[System.Double，mscorlib，版本=4.0.0.0.0，区域性=中性，PublicKeyToken=b77a5c561934e089]。]

澄清：（我不知道这是否重要，但一个匿名类型有一个#符号。哦，#01）

我有这两段代码。在同一个类（程序集）中。一个返回上面的一个匿名类型，另一个返回另一个。但是，两个都在计算同一个表达式

我做了下面的比较（有些只是为了查看结果，尽管有些应该正确返回false）。但是，它们都返回false。（我可能遗漏了一些我尝试过的）

ms返回一个匿名类型。 resultOfSelect返回另一个匿名类型

注意：第二段代码中的methodArgumentStringContainingSelectStatement包含与字符串相同的表达式

---

'ms==resultOfSelect'

'ms.GetType（）==resultOfSelect'

'ms.GetType（）.Equals（resultOfSelect.GetType（））'

'ms.GetType（）==resultOfSelect.GetType（）'

还有其他的，都是假的 结果选择调试视图为：

{Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable}

ms debugView是：

{Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable}

第一项声明：

   ' var ms =     (instanceContainingSelectMethod as IQueryable<Emar>).Select( nextEmarClassInstanceFromPreviousSelectMany => new { Schedule = nextEmarClassInstanceFromPreviousSelectMany.BEmem.Category.Substring(0, 1), Category = "0" + nextEmarClassInstanceFromPreviousSelectMany.BEmem.Category.Substring(1), Description = "", Year = nextEmarClassInstanceFromPreviousSelectMany.Month.Year, Time = nextEmarClassInstanceFromPreviousSelectMany.Actual_Time, Units = ((nextEmarClassInstanceFromPreviousSelectMany.BEmem.PurchDate ?? nextEmarClassInstanceFromPreviousSelectMany.BEmem.InServiceDate).Value.Year == nextEmarClassInstanceFromPreviousSelectMany.Month.Year)
? (nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate != null)
    ? (nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Year == nextEmarClassInstanceFromPreviousSelectMany.Month.Year)
        ? (((12d - ((double)((nextEmarClassInstanceFromPreviousSelectMany.BEmem.PurchDate != null)
            ? (System.DateTime?)nextEmarClassInstanceFromPreviousSelectMany.BEmem.PurchDate.Value
            : nextEmarClassInstanceFromPreviousSelectMany.BEmem.InServiceDate).Value.Month)) + 1d) - (12d - ((12d - ((double)nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Month)) + 1d))) / 12d
        : ((12d - ((double)(nextEmarClassInstanceFromPreviousSelectMany.BEmem.PurchDate ?? nextEmarClassInstanceFromPreviousSelectMany.BEmem.InServiceDate).Value.Month)) + 1d) / 12d
    : ((12d - ((double)(nextEmarClassInstanceFromPreviousSelectMany.BEmem.PurchDate ?? nextEmarClassInstanceFromPreviousSelectMany.BEmem.InServiceDate).Value.Month)) + 1d) / 12d
: (nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate != null)
    ? (nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Year == nextEmarClassInstanceFromPreviousSelectMany.Month.Year)
        ? (12d - ((12d - ((double)nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Month)) + 1d)) / 12d
        : 1d
    : 1d } );'

            'Func<IQueryable<Emar>, object> customSelectManyDelegate =

           await CSharpScript
             .EvaluateAsync<Func<IQueryable<Emar>, object>>(methodArgumentStringContainingSelectStatement, options);

         resultOfSelect =  customSelectManyDelegate(instanceContainingSelectMethod as IQueryable<Emar>);'

'var ms=（instanceContainingSelectMethod为IQueryable）。选择（NexterMassInstanceFromPreviousSelectMany=>new{Schedule=NexterMassInstanceFromPreviousSelectMany.BEmem.Category.Substring（0,1），Category=“0”+NexterMassInstanceFromPreviousSelectMany.BEmem.Category.Substring（1），Description=“”，Year=nexterClassInstanceFromPreviousSelectMany.Month.Year，Time=nexterClassInstanceFromPreviousSelectMany.Actual_时间，单位=（（nexterClassInstanceFromPreviousSelectMany.BEmem.purchate？？nexterClassInstanceFromPreviousSelectMany.BEmem.InServiceDate）Value.Year==nexterClassInstanceFromPreviousSelectMany.Month.Year）
？（nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate！=null）
？（nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Year==nextEmarClassInstanceFromPreviousSelectMany.Month.Year）
（（12d-（（双精度）（（nexterMarcClassInstanceFromPreviousSelectMany.BEmem.PurchDate！=null）
？（System.DateTime？）下一个MarcClassInstancefromPreviousSelectMany.BEmem.purcDate.Value
：nexterMarcClassInstanceFromPreviousSelectMany.BEmem.InServiceDate）.Value.Month））+1d-（12d-（（12d-（（双）nexterMarcClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Month））+1d））/12d
：（（12d-（（双精度）（nexterMarcClassInstanceFromPreviousSelectMany.BEmem.purchate？？nexterMarcClassInstanceFromPreviousSelectMany.BEmem.InServiceDate）。Value.Month））+1d）/12d
：（（12d-（（双精度）（nexterMarcClassInstanceFromPreviousSelectMany.BEmem.purchate？？nexterMarcClassInstanceFromPreviousSelectMany.BEmem.InServiceDate）。Value.Month））+1d）/12d
：（nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate！=null）
？（nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Year==nextEmarClassInstanceFromPreviousSelectMany.Month.Year）
？（12d-（（12d-（（双）下一个ArcClassInstancefromPreviousSelectMany.BEmem.SoldDate.Value.Month））+1d）/12d
：1d
：1d}）；'

第二项声明：

   ' var ms =     (instanceContainingSelectMethod as IQueryable<Emar>).Select( nextEmarClassInstanceFromPreviousSelectMany => new { Schedule = nextEmarClassInstanceFromPreviousSelectMany.BEmem.Category.Substring(0, 1), Category = "0" + nextEmarClassInstanceFromPreviousSelectMany.BEmem.Category.Substring(1), Description = "", Year = nextEmarClassInstanceFromPreviousSelectMany.Month.Year, Time = nextEmarClassInstanceFromPreviousSelectMany.Actual_Time, Units = ((nextEmarClassInstanceFromPreviousSelectMany.BEmem.PurchDate ?? nextEmarClassInstanceFromPreviousSelectMany.BEmem.InServiceDate).Value.Year == nextEmarClassInstanceFromPreviousSelectMany.Month.Year)
? (nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate != null)
    ? (nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Year == nextEmarClassInstanceFromPreviousSelectMany.Month.Year)
        ? (((12d - ((double)((nextEmarClassInstanceFromPreviousSelectMany.BEmem.PurchDate != null)
            ? (System.DateTime?)nextEmarClassInstanceFromPreviousSelectMany.BEmem.PurchDate.Value
            : nextEmarClassInstanceFromPreviousSelectMany.BEmem.InServiceDate).Value.Month)) + 1d) - (12d - ((12d - ((double)nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Month)) + 1d))) / 12d
        : ((12d - ((double)(nextEmarClassInstanceFromPreviousSelectMany.BEmem.PurchDate ?? nextEmarClassInstanceFromPreviousSelectMany.BEmem.InServiceDate).Value.Month)) + 1d) / 12d
    : ((12d - ((double)(nextEmarClassInstanceFromPreviousSelectMany.BEmem.PurchDate ?? nextEmarClassInstanceFromPreviousSelectMany.BEmem.InServiceDate).Value.Month)) + 1d) / 12d
: (nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate != null)
    ? (nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Year == nextEmarClassInstanceFromPreviousSelectMany.Month.Year)
        ? (12d - ((12d - ((double)nextEmarClassInstanceFromPreviousSelectMany.BEmem.SoldDate.Value.Month)) + 1d)) / 12d
        : 1d
    : 1d } );'

            'Func<IQueryable<Emar>, object> customSelectManyDelegate =

           await CSharpScript
             .EvaluateAsync<Func<IQueryable<Emar>, object>>(methodArgumentStringContainingSelectStatement, options);

         resultOfSelect =  customSelectManyDelegate(instanceContainingSelectMethod as IQueryable<Emar>);'

“Func customSelectManyDelegate=
等待CSharpScript
.EvaluateSync（methodArgumentStringContainingSelectStatement，options）；
resultOfSelect=customSelectManyDelegate（instancecontainingselectmethodasiqueryable）；'

匿名类型实际上只能在单个方法的上下文中使用，或者可能在某些反射场景中使用，其中形状很重要，而不是类型

因此：询问类型为何不同已经破坏了语言功能的意图。至于它们为何不同：可能是不同的程序集或模块。这尤其适用于视图编译晚于主代码的web项目

但是：基本上，不要依赖于这种平等性。这不是保证。如果您关心类型是什么（以及它等于什么），那么您的选择包括：

• 声明自己的正式类型，并使用它-最佳选择
• 使用值元组（

  ValueTuple

  ，但具有一流的语言支持，包括从被调用方传播到调用方，但不从调用方传播到被调用方的伪名称）
• 使用元组（

  Tuple

  ）

---

使用匿名类型实际上不会出现在列表中。

匿名类型实际上只用于单个方法的上下文中，或者可能用于某些仅形状而非类型重要的反射场景中

所以：阿斯金