join子句中某个表达式的类型不正确。调用“加入”时类型推断失败

Question

我与Linq-To-Sql有一个问题

在“加入”

的调用中，类型推断失败

var conditionsFound = (from QuantiReports.Data.RoomInspectionGuid test in tests
                       where test.roomfloorid == obj.floorroomId                                               
                       join testItem in testItems //This join statement has an error

                       on new { roomItemId = obj.roomitemId, testId = test.id } equals new { roomItemId = testItem.roomitemid.Value, testId = testItem.roominspectionid }
                                           join testsCondition in testsConditions
                                           on new { conditionId = condition.id, testitemId = testItem.id } equals new { conditionId = testsCondition.conditionId, testitemId = testsCondition.roomItemInspectionId }
                                           select testsCondition).Count();

Answer 1

除语法外，您可以在新{conditionId = condition.id ＆＃34;上查看第二个连接表达式＆＃34; 。检查类型＆＃34; 条件＆＃34;是否定义。