EFCore 迁移命令移除外键
继承 MigrationsModelDiffer，重载 GetDifferences 并移除 ForeignKeys
1 [System.Diagnostics.CodeAnalysis.SuppressMessage("Usage", "EF1001:Internal EF Core API usage.", Justification = "<挂起>")] 2 public class MigrationsModelDifferWithoutForeignKey : MigrationsModelDiffer 3 { 4 public MigrationsModelDifferWithoutForeignKey 5 ([NotNull] IRelationalTypeMappingSource typeMappingSource, 6 [NotNull] IMigrationsAnnotationProvider migrationsAnnotations, 7 [NotNull] IChangeDetector changeDetector, 8 [NotNull] IUpdateAdapterFactory updateAdapterFactory, 9 [NotNull] CommandBatchPreparerDependencies commandBatchPreparerDependencies) 10 : base(typeMappingSource, migrationsAnnotations, changeDetector, updateAdapterFactory, commandBatchPreparerDependencies) 11 { 12 } 13 14 public override IReadOnlyList<MigrationOperation> GetDifferences(IModel source, IModel target) 15 { 16 var operations = base.GetDifferences(source, target) 17 .Where(op => !(op is AddForeignKeyOperation)) 18 .Where(op => !(op is DropForeignKeyOperation)) 19 .ToList(); 20 21 foreach (var operation in operations.OfType<CreateTableOperation>()) 22 operation.ForeignKeys?.Clear(); 23 24 return operations; 25 } 26 }
使用时，替换服务即可：
services.AddDbContext<MyDbContext>(options => { options.UseSqlServer(Default); options.ReplaceService<IMigrationsModelDiffer, MigrationsModelDifferWithoutForeignKey>(); });
