Entity Framework 更新行，同时排除 IDENTITY 列

Question

我正在尝试更新一行，同时忽略数据库中存在的标识列。

更新时出现以下错误：

_context.Entry(existingEvent).Property(x => x.ReferenceNumber).IsModified = false;
_context.Events.Update(existingEvent);

Exception: Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.SqlClient.SqlException: Cannot update identity column 'ReferenceNumber'.

我也尝试了以下但也导致异常：

_context.Events.Update(existingEvent);
_context.Entry(existingEvent.ReferenceNumber).State = EntityState.Unchanged;

System.InvalidOperationException: The entity type 'int' was not found. Ensure that the entity type has been added to the model.

Table:

CREATE TABLE [DW].[Reporting]
(
    [ID] UNIQUEIDENTIFIER NOT NULL,
    [ReferenceNumber] INT NOT NULL IDENTITY(1,1) UNIQUE,
    [Date] DATETIME NOT NULL,
    [Address] VARCHAR(256) NOT NULL,
    [EventName] VARCHAR(256),
    [Subject] VARCHAR(512),
    [PhotographerID] UNIQUEIDENTIFIER,
    [CameraNumber] VARCHAR(24),
    [PictureAmount] INT,
    [NegativeID] UNIQUEIDENTIFIER,
    [CategoryID] UNIQUEIDENTIFIER,
    [People] VARCHAR(256),

    CONSTRAINT [PK_Reporting] PRIMARY KEY (ID),
    CONSTRAINT [UV_Reporting_Code] UNIQUE ([ReferenceNumber]),
    CONSTRAINT [FK_Reporting_Photographers_PhotographerID] 
        FOREIGN KEY ([PhotographerID]) REFERENCES [DW].[Photographers]([ID]),
    CONSTRAINT [FK_Reporting_Negatives_NegativeID] 
        FOREIGN KEY ([NegativeID]) REFERENCES [DW].[Negatives]([ID]),
    CONSTRAINT [FK_Reporting_Categories_CategoryID] 
        FOREIGN KEY ([CategoryID]) REFERENCES [DW].[Categories]([ID])
)

Answer 1

您刚刚颠倒了代码。 Update() 将所有属性标记为已修改。如果你想排除一个，之后再做。

_context.Events.Update(existingEvent);
_context.Entry(existingEvent).Property(x => x.ReferenceNumber).IsModified = false;

Entity Framework 更新行，同时排除 IDENTITY 列

Entity Framework update row while excluding IDENTITY column

.net

tsql

entity-framework

identity-insert

asp.net-core