ABP实体设置组合主键

public class SYSDEA : Entity<string>
{
/// <summary>
/// 无效Id
/// </summary>
[NotMapped]
public override string Id => $"{DEA001}-{DEA002}";
/// <summary>
/// 类别
/// </summary>
[Required]
public string DEA001 { get; set; }

/// <summary>
/// 年
/// </summary>
[Required]
public string DEA002 { get; set; }

}