尝试使用初始化程序设置我的数据库时遇到了一些麻烦。我有 3 个表，LabTest->LabValue<-LabIndicator，这就是我的编码方式：
public class LabTest
{
public int ID { get; set; }
public DateTime ApplicationDate { get; set; }
public virtual ICollection<LabValue> LabValues { get; set; }
}
public class LabValue
{
public int ID { get; set; }
public decimal Value { get; set; }
public int LabTestID { get; set; }
public int LabIndicatorID { get; set; }
public virtual LabTest LabTest { get; set; }
public virtual LabIndicator LabIndicator { get; set; }
}
public class LabIndicator
{
public int ID { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public virtual ICollection<LabValue> LabValues { get; set; }
}
这就是我在 DBContext 中编写 Db Intializer 的方式：
public class SummumnetDB : DbContext
{
public DbSet<LabIndicator> LabIndicators { get; set; }
public DbSet<LabTest> LabTests { get; set; }
public DbSet<LabValue> LabValues { get; set; }
public class MyFirstInitializer : DropCreateDatabaseIfModelChanges<SummumnetDB>
{
protected override void Seed(SummumnetDB context)
{
new List<LabTest>
{
new LabTest{ ApplicationDate = DateTime.Now},
new LabTest{ ApplicationDate = DateTime.Now},
}.ForEach(l => context.LabTest.Add(l));
new List<LabIndicator>
{
new LabIndicator{ Name="CHOLESTEROL", Description = "Cholesterol lvl"},
new LabIndicator{ Name="HEMOGLOBIN", Description = "Hemoglobin lvl"},
new LabIndicator{ Name="GLUCOSE", Description = "Glucose lvl"},
}.ForEach(l => context.LabIndicators.Add(l));
new List<LabValue>
{
new LabValue{ LabTestID = 1, LabIndicatorID = 1, Value = 2.3m },
new LabValue{ LabTestID = 1, LabIndicatorID = 2, Value = 5.8m },
new LabValue{ LabTestID = 1, LabIndicatorID = 3, Value = 5.2m },
new LabValue{ LabTestID = 2, LabIndicatorID = 1, Value = 6.7m },
new LabValue{ LabTestID = 2, LabIndicatorID = 2, Value = 9.8m },
new LabValue{ LabTestID = 2, LabIndicatorID = 3, Value = 4.3m },
}.ForEach(l => context.LabValue.Add(l));
base.Seed(context);
}
}
问题是，当我运行它时，EF 尝试创建数据库时出现此错误：
INSERT 语句与 FOREIGN KEY 约束“LabIndicator_LabValues”冲突。冲突发生在数据库“SummumnetDB”、表“dbo.LabIndicators”、列“ID”中。该语句已终止。希望你能解决，谢谢。