Question

我有一个相对简单的应用程序，它使用EF6通过.NET Web API提取SQL数据。数据库中有三个表：

产品

CREATE TABLE [dbo].[Product]
(
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Name] [varchar](255) NOT NULL,
    [FullName] [varchar](max) NOT NULL,
    [Description] [varchar](max) NOT NULL,
    [BranchID] [int] NOT NULL,
    [ProgramID] [int] NOT NULL,
    [TechnologyPlatformID] [int] NOT NULL,
    [StatusID] [int] NOT NULL,
    [FunctionID] [int] NOT NULL,
    [ProgramManagerID] [int] NOT NULL,
    [TypeID] [int] NOT NULL,
    [Vendor] [varchar](max) NOT NULL,
    [VendorPOC] [varchar](max) NOT NULL,
    [URL] [varchar](255) NULL,
    [Code] [varchar](50) NULL,
    [CreatedBy] [int] NOT NULL,
    [CreateDate] [datetime] NOT NULL,
    [ModifiedBy] [int] NOT NULL,
    [ModifiedDate] [datetime] NOT NULL,

    CONSTRAINT [PK_Product] 
        PRIMARY KEY CLUSTERED ([ID] ASC)
                    WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, 
                          IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, 
                          ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

SET ANSI_PADDING OFF
GO

ALTER TABLE [dbo].[Product] WITH CHECK 
     ADD CONSTRAINT [FK_Product_Function] 
     FOREIGN KEY([FunctionID]) REFERENCES [dbo].[Function] ([ID])
GO

ALTER TABLE [dbo].[Product] CHECK CONSTRAINT [FK_Product_Function]
GO

ALTER TABLE [dbo].[Product] WITH CHECK 
     ADD CONSTRAINT [FK_Product_Program] 
     FOREIGN KEY([ProgramID]) REFERENCES [dbo].[Program] ([ID])
GO

ALTER TABLE [dbo].[Product] CHECK CONSTRAINT [FK_Product_Program]
GO

程序：

CREATE TABLE [dbo].[Program]
(
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Name] [varchar](255) NOT NULL,

    CONSTRAINT [PK_Program] 
        PRIMARY KEY CLUSTERED ([ID] ASC)
                    WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, 
                          IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, 
                          ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

SET ANSI_PADDING OFF
GO

功能：

CREATE TABLE [dbo].[Function]
(
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Name] [varchar](255) NOT NULL,
    [Description] [varchar](max) NOT NULL,

    CONSTRAINT [PK_Function_1] 
        PRIMARY KEY CLUSTERED ([ID] ASC)
                    WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, 
                          IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, 
                          ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

我的EDMX看起来很正常：

以下是我在我的仓库中访问数据的方式：

突然，我在调用GetProducts()时遇到以下错误：

未知模块中出现未处理的“System.AccessViolationException”类型异常。

附加信息：尝试读取或写入受保护的内存。这通常表明其他内存已损坏。

我似乎无法弄清楚造成这种情况的原因。这是我尝试过的：

确保在VS
在我的本地计算机上修复了.NET Framework

两者都没有...但是，如果我删除SQL中的Function表并更新我的EDMX，问题就解决了。为什么这个表会导致问题？

感谢任何输入，谢谢！

Answer 1

尝试关闭代理生成功能，看看是否仍然遇到同样的问题。

我最初的猜测是您通过Program直接包含.Include(x => x.Program)，但Function导航属性被代理到一个懒惰的属性中。当WebAPI尝试序列化它时，它会抛出错误。

尝试读取或写入受保护的内存 - .NET EF + Web API

1 个答案: