我有以下型号:
public class Company
{
//Primary key
public string ID { get; set; }
//Foreign key
public int? LogotypeID { get; set; }
}
和
public class Logotype
{
//Primary key
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int? ID { get; set; }
//Foreign key
public string CompanyID { get; set; }
}
如何从公司表中删除标识,不用删除公司行?
使用:
http://msdn.microsoft.com/en-us/library/system.data.entity.dbset.remove(v=vs.113).aspx
DbSet.Remove(Logotype)抛出以下异常:
{"The DELETE statement conflicted with the REFERENCE constraint \"FK_dbo.Companies_dbo.Logotypes_LogotypeID\". The conflict occurred in database \"ShipReg\", table \"dbo.Companies\", column 'LogotypeID'.\r\nThe statement has been terminated."}
有什么想法吗?
BR, 添
答案 0 :(得分:2)
在公司中添加虚拟财产,例如
public class Company
{
//Primary key
public string ID { get; set; }
//Foreign key
public int? LogotypeID { get; set; }
public virtual Logotype Logotype {get;set;}
}
然后
dbContext.Entry<Company>(company).State=EntityState.Modified;
dbContext.Entry<Logotype>(company.Logotype).State=EntityState.Deleted;