[Table("office_entity")]
public class EFOffice : EFBusinessEntity
{

    [Column("address")]
    [StringLength(250)]
    public string Address { get; set; }

    [Column("business_name")]
    [StringLength(150)]
    public string BusinessName { get; set; }

    public virtual ICollection<EFEmployee> Employees { get; set; }

    public EFOffice(Guid id,Guid tenantId,string address,string businessName)
    {
        this.Id = id;
        this.TenantId = tenantId;
        this.Address = address;
        this.BusinessName = businessName;
    }
}

我正在实现一个通用存储库,我刚刚添加了这个方法来检查存储库中是否已存在实体：

public bool Exists<TEntity>(Guid key) where TEntity : class,IBusinessEntity
{
    return (_context.Set<TEntity>().Find(key) != null);
}

然后我写了以下测试代码：

public void TestExists1()
{
    InitializeDatabase();
    EFOffice testOffice = InitializeOffice1();
    Debug.Assert(EFRepo.Exists<EFOffice>(testOffice.Id));
}

InitializeOffice1()的方法如下：

private EFOffice InitializeOffice1()
{
    EFOffice newOffice = new EFOffice(SparkTest.TestGuid1,SparkTest.TestGuid2,"Generic Address","HQ");
    return newOffice;
}

该测试应该通过,因为我已经插入了InitializeOffice1()之前返回的办公室.但是,我收到以下错误：

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. —> System.InvalidOperationException: The class ‘Models.Employees.EF.EFOffice’ has no parameterless constructor.

那么我将其添加到顶部显示的EFOffice类中：

private EFOffice()
{

}

由于某种原因,测试现在通过.谁能解释一下发生了什么？并且无参数构造函数会产生不良副作用吗？重要的是,我插入的每个办公室都有一个id,一个tenantId,一个地址和一个businessName,如顶部的构造函数中所列.