VB.Net 中派生接口的转换错误

问题描述

我目前在尝试将对象强制转换为泛型类型时遇到此错误。

Unable to cast object of type 'Exam.Infraestructure.Strategies.CustomerSelectStrategy' to type
    'Exam.Core.Strategies.IExecutionConfiguration`1[Exam.Core.Entities.IEntity]'.

这是我的配置：

Namespace Exam.Core.Entities

    Public Interface IEntity
        Property Id As Integer
    End Interface

    Public Class Customer : Implements IEntity
        Property Id As Integer Implements IEntity.Id
        Property Name As String
        Property MobilePhone As String
    End Class

End Namespace

Namespace Exam.Core.Strategies

    Public Interface IExecutionConfiguration(Of IEntity) Inherits IStrategyExecution
        Function GetAction(entity As IEntity) As Task(Of String)
        Function GetAction(filters As Lookup(Of ExpressionType,Object())) As Task(Of String)
    End Interface

    Public Interface IStrategyExecution
        ReadOnly Property Id As String
    End Interface
End Namespace

Namespace Exam.Infraestructure.Strategies

    Public Class CustomerAddStrategy : Inherits BaseStrategy : Implements IExecutionConfiguration(Of Customer)

        Sub New()
        End Sub

        Public ReadOnly Property Id As String Implements IStrategyExecution.Id
            Get
                Return "add"
            End Get
        End Property

        Public Overloads Async Function GetAction(entity As Customer) As Task(Of String) Implements IExecutionConfiguration(Of Customer).GetAction
            Throw New NotImplementedException()
        End Function

        Public Overloads Async Function GetAction(filters As Lookup(Of ExpressionType,Object())) As Task(Of String) Implements IExecutionConfiguration(Of Customer).GetAction
            Throw New NotImplementedException()
        End Function

    End Class

End Namespace

我尝试使用此选项进行投射：

Dim strategy As IExecutionConfiguration(Of IEntity) = customerAddobject
Dim strategy = CType(customerAddobject,IExecutionConfiguration(Of IEntity))

在调试程序的时候，看到CustomerAddStrategy(AssemblyQualifiedname)中实现了两个接口：

- Exam.Core.Strategies.IExecutionConfiguration`1[[Exam.Core.Entities.Customer,Exam.Core,Version=0.0.0.0,Culture=neutral,PublicKeyToken=null]],PublicKeyToken=null
- Exam.Core.Strategies.IStrategyExecution,PublicKeyToken=null

BaseStrategy 是一个带有一些共享代码的抽象类，它没有任何实现的接口或类。 也许这是我正在做的协方差和逆变的错误配置？我该如何解决这个问题？

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）