我试图建立与实体框架核心的Web应用程序，我创建了两个型号Category的Pie，我做的所有事情，包括的DbContext的依赖注入，我创建了一个DbInializer类来检查，如果数据库是空的，如果这是真的，那会插入一些数据，问题是当我运行应用程序时出现异常，好像类别表中的主键和 Pies 表中的外键之间存在冲突，这是异常：
System.Data.SqlClient.SqlException: The MERGE statement conflicted with the FOREIGN KEY constraint "FK_Pies_Categories_CategoryId".The conflict occurred in database "ShopDb", table "dbo.Categories", column 'CategoryId'.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean & dataReady)
at System.Data.SqlClient.SqlDataReader.TryHasMoreRows(Boolean & moreRows)
at System.Data.SqlClient.SqlDataReader.TryHasMoreResults(Boolean & moreResults)
at System.Data.SqlClient.SqlDataReader.TryNextResult(Boolean & more)
at System.Data.SqlClient.SqlDataReader.NextResult()
at Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.Consume(DbDataReader reader)
ClientConnectionId: 775a7294 - 531a - 44cc …