我不知道它是否代表我的实体框架的设计选择或错误的方法,但每当我尝试将AddRange实体添加到DbSet时,我都无法获取自动生成的IDENTITY字段。无法在实体框架中使用AddRange自动生成IDENTITY
[Table("entities")]
public class Entity
{
[Key]
[Column("id")]
public long Id { get; set; }
[Column("field")]
public string Field { get; set; }
}
var entities = new Entity[]
{
new Entity() { Field = "A" },
new Entity() { Field = "B" },
};
_dbContext.Entities.AddRange(entities);
await _dbContext.SaveChangesAsync();
//ids are still default(long) at this point!!
编辑: 下面是更新代码来显示是什么原因导致的问题:可枚举。无需为实体类添加其他属性。
public class Request
{
public string Field { get; set; }
public Entity ToEntity()
{
return new Entity() { Field = Field };
}
}
public async Task<IEnumerable<long>> SaveRequests(IEnumerable<Request> requests)
{
var entities = requests.Select(r => r.ToEntity()); //not working
var entities = requests.Select(r => r.ToEntity()).ToArray(); //working
_dbContext.Entities.AddRange(entities);
await _dbContext.SaveChangesAsync();
return entities.Select(e => e.Id);
}
[关键] [DatabaseGenerated(DatabaseGeneratedOption.Identity) –
我HAE同样的问题, VAR威刚= referencias.Select(I => 新InternalClass() {/ *身份证AUTOGEN,*/... }); db.InternalClass.AddRange(aData); db.SaveChanges(); 但无法检索aData.FirstOrDefault()(id = 0) 上的新ID您是否发现了有关它发生的更多信息? –