entity framework – 使用外键删除对象，保留父对象

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; } } 

如何在不删除公司行的情况下从Company表中删除标识？

使用：
http://msdn.microsoft.com/en-us/library/system.data.entity.dbset.remove(v=vs.113).aspx DbSet.Remove（Logotype）引发以下exception：

 {"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."} 

有任何想法吗？

布朗，蒂姆

Answer 1

在公司中添加虚拟财产

 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).State=EntityState.Modified; dbContext.Entry(company.Logotype).State=EntityState.Deleted;