Entity Framework Fluent API: IndexAnnotationSerializer 无法序列化 'IndexAttribute' 类型的对象。

Question

我正在使用 EF 6.1.3 并遇到此错误。

"An object of type 'IndexAttribute' cannot be serialized by the IndexAnnotationSerializer. Only 'IndexAnnotation' objects can be serialized."

这是配置文件之一

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity.Infrastructure.Annotations;
using System.Data.Entity.ModelConfiguration;
using System.Linq;
using System.Web;
using MasterDetails.Models;

namespace MasterDetails.DataLayer
{
    public class InventoryItemConfiguration :     EntityTypeConfiguration<InventoryItem>
{
    public InventoryItemConfiguration()
    {
        Property(ii => ii.InventoryItemCode)
            .HasMaxLength(15)
            .IsRequired()
            .HasColumnAnnotation("Index", new IndexAnnotation(new IndexAttribute("AK_InventoryItem_InventoryItemCode") { IsUnique = true }));

        Property(ii => ii.InventoryItemName)
            .HasMaxLength(80)
            .IsRequired()
            .HasColumnAnnotation("Index", new IndexAttribute("AK_InventoryItem_InventoryItemName") { IsUnique = true });

        Property(ii => ii.UnitPrice)
            .HasPrecision(18, 2);
    }
}
}

Answer 1

替换以下代码：

.HasMaxLength(50)
.HasColumnAnnotation("Index", new IndexAnnotation(new IndexAttribute("AK_InventoryItem_InventoryItemName", 2) { IsUnique = false }));

并删除 .IsRequired()

IndexAttribute有两个重载，第二个重载是顺序。

Answer 2

异常是由以下行引起的

.HasColumnAnnotation("Index", new IndexAttribute("AK_InventoryItem_InventoryItemName") { IsUnique = true });

您需要将 IndexAttribute 包裹在 IndexAnnotation 中（正如您已经对另一列 InventoryItemCode 所做的那样）：

.HasColumnAnnotation("Index", new IndexAnnotation(
    new IndexAttribute("AK_InventoryItem_InventoryItemName") { IsUnique = true }));

Entity Framework Fluent API: IndexAnnotationSerializer 无法序列化 'IndexAttribute' 类型的对象。

Entity Framework Fluent API: An object of type 'IndexAttribute' cannot be serialized by the IndexAnnotationSerializer.

c#

api

entity-framework

fluent