Question

我有一个像这样的LINQ实体：

ID1 INT
ID2 INT
ID3 INT
Value VARCHAR(50)

ID1，ID2＆amp; ID3是复合主键。它与任何其他实体没有关联。

每当我在 SubmitChanges 之后更新或删除时，都会抛出 IndexOutOfRangeException 。我在.NET 3.5 SP1上运行。

我已尝试创建另一个项目，仍在.NET 3.5 SP1上，但不会遇到该异常。

以下是代码：

        DataClasses context = new DataClasses();
        Entity entity = (from entities in context.Entities
                              where entities.ID1 == 3
                                && entities.ID2 == 1
                                && entities.ID3 == 1
                              select entities).First();

        context.Entities.DeleteOnSubmit(entity);
        context.SubmitChanges();

以下是例外：

System.IndexOutOfRangeException was unhandled by user code
  Message="Index was outside the bounds of the array."
  Source="System.Data.Linq"
  StackTrace:
       at System.Data.Linq.IdentityManager.StandardIdentityManager.MultiKeyManager`3.TryCreateKeyFromValues(Object[] values, MultiKey`2& k)
       at System.Data.Linq.IdentityManager.StandardIdentityManager.IdentityCache`2.Find(Object[] keyValues)
       at System.Data.Linq.IdentityManager.StandardIdentityManager.Find(MetaType type, Object[] keyValues)
       at System.Data.Linq.CommonDataServices.GetCachedObject(MetaType type, Object[] keyValues)
       at System.Data.Linq.ChangeProcessor.GetOtherItem(MetaAssociation assoc, Object instance)
       at System.Data.Linq.ChangeProcessor.BuildEdgeMaps()
       at System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode)
       at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode)
       at System.Data.Linq.DataContext.SubmitChanges()
       at Project.Page.Page_Load(Object sender, EventArgs e) in C:\ProjectFolder\Project\Page.aspx.cs:line 31
       at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
       at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
       at System.Web.UI.Control.OnLoad(EventArgs e)
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  InnerException:

Answer 1

我从头开始重新创建了DBML。叹息...

Answer 2

似乎LINQ To SQL（有/有）组合键有问题。实际来源为MultiKeyManager和TryCreateKeyFromValues(Object[] values

此ElegantCode post on SubmitChanges throws IndexOutOfRangeException与您的错误完全相同，条件类似。区别在于他有另一个字段来修改.dbml模型并标记为PK。

您是否能够在.dbml模型中修改/删除3个整数的PrimaryKey=true属性？

该文章的关键引用：

从SomeType和SomeValue中删除PrimaryKey = true属性，并在ViewID属性上添加它，现在LinqToSql正确处理关联。

LINQ：IndexOutOfRangeException

2 个答案: