添加移除外键的迁移

samples/Sample.Migrations/DefaultDesignTimeDbContextFactory.cs

@@ -21,6 +21,7 @@ namespace Sample.Migrations
                     (conn, o) =>
                         o.UseSqlServer(conn)
                             .ReplaceService<IMigrationsSqlGenerator, ShardingSqlServerMigrationsSqlGenerator<DefaultShardingTableDbContext>>()
+                            .ReplaceService<IMigrationsModelDiffer,RemoveForeignKeyMigrationsModelDiffer>()
                 ).Begin(o =>
                 {
                     o.CreateShardingTableOnStart = false;

samples/Sample.Migrations/RemoveForeignKeyMigrationsModelDiffer.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using Microsoft.EntityFrameworkCore.ChangeTracking.Internal;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Migrations.Internal;
+using Microsoft.EntityFrameworkCore.Migrations.Operations;
+using Microsoft.EntityFrameworkCore.Storage;
+using Microsoft.EntityFrameworkCore.Update;
+using Microsoft.EntityFrameworkCore.Update.Internal;
+
+namespace Sample.Migrations
+{
+/*
+* @Author: xjm
+* @Description:
+* @Date: Sunday, 28 November 2021 21:35:45
+* @Email: 326308290@qq.com
+*/
+    [SuppressMessage("Usage", "EF1001:Internal EF Core API usage.", Justification = "<挂起>")]
+    public class RemoveForeignKeyMigrationsModelDiffer:MigrationsModelDiffer
+    {
+        public RemoveForeignKeyMigrationsModelDiffer(IRelationalTypeMappingSource typeMappingSource, IMigrationsAnnotationProvider migrationsAnnotations, IChangeDetector changeDetector, IUpdateAdapterFactory updateAdapterFactory, CommandBatchPreparerDependencies commandBatchPreparerDependencies) : base(typeMappingSource, migrationsAnnotations, changeDetector, updateAdapterFactory, commandBatchPreparerDependencies)
+        {
+        }
+
+        public override IReadOnlyList<MigrationOperation> GetDifferences(IRelationalModel? source, IRelationalModel? target)
+        {
+            var sourceOperations = base.GetDifferences(source, target).ToList();
+            sourceOperations.RemoveAll(x => x is AddForeignKeyOperation || x is DropForeignKeyOperation);
+            foreach (var operation in sourceOperations.OfType<CreateTableOperation>())
+            {
+                operation.ForeignKeys?.Clear();
+            }
+            return sourceOperations;
+        }
+    }
+}