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有一个代码优先的 MVC4 模型，需要外键查找同一个表。即我的项目表有两列（BaseFiscalId 和IMITApprovalCycleId），它们引用同一个表，即FiscalYears。我如何在代码中定义它。

目前我有以下内容：

public class Project
{
    [Required]
    public int Id { get; set; }

    [Required]
    public int InitiativeId { get; set; }

    [Required]
    public String ProjectName { get; set; }

    [Required]
    public int SubPortFolioId { get; set; }

    [Required]
    public String Description { get; set; }

    [Required]
    public int ProjectTypeId { get; set; }

    [Required]
    public int FundingSourceId { get; set; }

    [Required]
    public int FundingPhaseAId { get; set; }

    [Required]
    public int ApprovalStatusId { get; set; }

    [Required]
    public int IMITApprovalProcessId { get; set; }

    [Required]
    public int IMITApprovalCycleId { get; set; }

    [Required]
    public int AccountableExecutiveId { get; set; }

    [Required]
    public int LeadMinistryId { get; set; }

    [Required]
    public int BaseFiscalId { get; set; }

    [Required]
    public int TotalSpentToBase { get; set; }

    //Navigation Properties --Child Projects
    public ICollection<Spend> Spends { get; set; }

    public SubPortfolio SubPortfolio { get; set; }
    public ProjectType ProjectType { get; set; }
    public FundingPhase FundingPhase { get; set; }
    public FundingSource FundingSource { get; set; }
    public ApprovalStatus ApprovalStatus { get; set; }
    public IMITApprovalProcess IMITApprovalProcess { get; set; }
    public FiscalYear IMITApprovalCycle { get; set; }
    public FiscalYear BaseFiscal { get; set; }
    public Portfolio Portfolio { get; set; }
    public Executive AccountableExecutive { get; set; }
    public Ministry LeadMinistry { get; set; }
    public Initiative Initiative { get; set; }


}

会计年度类

public class FiscalYear
{
    [ScaffoldColumn(false)]
    public int Id { get; set; }
    [Required]
    public String FiscalYearName { get; set; }
}

这将产生以下 SQL：

CREATE TABLE [dbo].[Projects] (
       [Id]                     INT            NOT NULL,
       [InitiativeId]           INT            NOT NULL,
       [ProjectName]            NVARCHAR (MAX) NOT NULL,
       [SubPortFolioId]         INT            NOT NULL,
       [Description]            NVARCHAR (MAX) NOT NULL,
       [ProjectTypeId]          INT            NOT NULL,
       [FundingSourceId]        INT            NOT NULL,
       [FundingPhaseAId]        INT            NOT NULL,
       [ApprovalStatusId]       INT            NOT NULL,
       [IMITApprovalProcessId]  INT            NOT NULL,
       [IMITApprovalCycleId]    INT            NOT NULL,
       [AccountableExecutiveId] INT            NOT NULL,
       [LeadMinistryId]         INT            NOT NULL,
       [BaseFiscalId]           INT            NOT NULL,
       [TotalSpentToBase]       INT            NOT NULL,
       [FundingPhase_Id]        INT            NULL,
       [Portfolio_Id]           INT            NULL,
       [Initiative_Id]          INT            NULL,
       CONSTRAINT [PK_dbo.Projects] PRIMARY KEY CLUSTERED ([Id] ASC),
       CONSTRAINT [FK_dbo.Projects_dbo.SubPortfolios_SubPortFolioId] FOREIGN KEY ([SubPortFolioId]) REFERENCES [dbo].[SubPortfolios] ([Id]) ON DELETE CASCADE,
       CONSTRAINT [FK_dbo.Projects_dbo.ProjectTypes_ProjectTypeId] FOREIGN KEY ([ProjectTypeId]) REFERENCES [dbo].[ProjectTypes] ([Id]) ON DELETE CASCADE,
       CONSTRAINT [FK_dbo.Projects_dbo.FundingPhases_FundingPhase_Id] FOREIGN KEY ([FundingPhase_Id]) REFERENCES [dbo].[FundingPhases] ([Id]),
       CONSTRAINT [FK_dbo.Projects_dbo.FundingSources_FundingSourceId] FOREIGN KEY ([FundingSourceId]) REFERENCES [dbo].[FundingSources] ([Id]) ON DELETE CASCADE,
       CONSTRAINT [FK_dbo.Projects_dbo.ApprovalStatus_ApprovalStatusId] FOREIGN KEY ([ApprovalStatusId]) REFERENCES [dbo].[ApprovalStatus] ([Id]) ON DELETE CASCADE,
       CONSTRAINT [FK_dbo.Projects_dbo.IMITApprovalProcesses_IMITApprovalProcessId] FOREIGN KEY ([IMITApprovalProcessId]) REFERENCES [dbo].[IMITApprovalProcesses] ([Id]) ON DELETE CASCADE,
       **CONSTRAINT [FK_dbo.Projects_dbo.FiscalYears_Id] FOREIGN KEY ([Id]) REFERENCES [dbo].[FiscalYears] ([Id])**,
       CONSTRAINT [FK_dbo.Projects_dbo.Portfolios_Portfolio_Id] FOREIGN KEY ([Portfolio_Id]) REFERENCES [dbo].[Portfolios] ([Id]),
       CONSTRAINT [FK_dbo.Projects_dbo.Executives_AccountableExecutiveId] FOREIGN KEY ([AccountableExecutiveId]) REFERENCES [dbo].[Executives] ([Id]) ON DELETE CASCADE,
       CONSTRAINT [FK_dbo.Projects_dbo.Ministries_LeadMinistryId] FOREIGN KEY ([LeadMinistryId]) REFERENCES [dbo].[Ministries] ([Id]) ON DELETE CASCADE,
       CONSTRAINT [FK_dbo.Projects_dbo.Initiatives_Initiative_Id] FOREIGN KEY ([Initiative_Id]) REFERENCES [dbo].[Initiatives] ([Id])

请注意，不是为 FiscalYears 创建两个 FK 关系，而是为 BaseFiscal 和 IMITApprovalCycle 分别创建一个，它仅在项目表中不存在的 Fiscal_Id 上创建。

谢谢

克雷格

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