。
这个问题涉及到使用Oracle.EntityFrameworkCore提供程序创建数据库上下文时,ICollection类型的导航属性不会自动创建Scaffold属性的情况。
在Entity Framework Core中,Scaffold属性是用于指示在迁移期间是否自动创建相关的导航属性。然而,使用Oracle.EntityFrameworkCore提供程序时,ICollection类型的导航属性默认不会生成Scaffold属性。
要解决这个问题,可以采取以下步骤:
public class MyDbContext : DbContext
{
public DbSet<Entity1> Entity1 { get; set; }
public DbSet<Entity2> Entity2 { get; set; }
public ICollection<Entity2> Entity1Entity2 { get; set; }
}
public class Entity1
{
public int Id { get; set; }
// Other properties...
[ScaffoldColumn(false)] // 添加Scaffold属性
public ICollection<Entity2> Entity1Entity2 { get; set; }
}
public class Entity2
{
public int Id { get; set; }
// Other properties...
}
Add-Migration InitialCreate
public partial class InitialCreate : Migration
{
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.CreateTable(
name: "Entity1",
columns: table => new
{
Id = table.Column<int>(nullable: false)
.Annotation("Oracle:ValueGenerationStrategy", OracleValueGenerationStrategy.IdentityColumn),
// Other columns...
},
constraints: table =>
{
table.PrimaryKey("PK_Entity1", x => x.Id);
});
migrationBuilder.CreateTable(
name: "Entity2",
columns: table => new
{
Id = table.Column<int>(nullable: false)
.Annotation("Oracle:ValueGenerationStrategy", OracleValueGenerationStrategy.IdentityColumn),
// Other columns...
},
constraints: table =>
{
table.PrimaryKey("PK_Entity2", x => x.Id);
});
migrationBuilder.CreateTable(
name: "Entity1Entity2",
columns: table => new
{
Entity1Id = table.Column<int>(nullable: false),
Entity2Id = table.Column<int>(nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_Entity1Entity2", x => new { x.Entity1Id, x.Entity2Id });
table.ForeignKey(
name: "FK_Entity1Entity2_Entity1_Entity1Id",
column: x => x.Entity1Id,
principalTable: "Entity1",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
table.ForeignKey(
name: "FK_Entity1Entity2_Entity2_Entity2Id",
column: x => x.Entity2Id,
principalTable: "Entity2",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
});
migrationBuilder.CreateIndex(
name: "IX_Entity1Entity2_Entity2Id",
table: "Entity1Entity2",
column: "Entity2Id");
}
protected override void Down(MigrationBuilder migrationBuilder)
{
migrationBuilder.DropTable(
name: "Entity1Entity2");
migrationBuilder.DropTable(
name: "Entity1");
migrationBuilder.DropTable(
name: "Entity2");
}
}
通过以上步骤,你就可以使用Oracle.EntityFrameworkCore提供程序创建数据库上下文时,为ICollection类型的导航属性添加Scaffold属性,并生成相关的迁移文件和数据库表结构。
请注意,以上的解决方案是基于Oracle.EntityFrameworkCore提供程序的特定情况,对于其他数据库提供程序可能会有不同的解决方法。同样,根据你的实际情况,可能需要进行适当的调整和修改。