小编Avi*_*aro的帖子

我正在尝试在 EFCore:Square和Position. 位置有一个（位置）多（正方形）与名为平方关系squares，还有两个一-到-之间的一个关系Square命名enPassentTakablePawnOfWhite和enPassentTakablePawnOfBlack。请注意，两个实体中的 FK 和 PK 都是阴影属性：

public class PositionTypeConfiguration : IEntityTypeConfiguration<Position>
    {
        public void Configure(EntityTypeBuilder<Position> builder)
        {
            builder.ToTable("Positions");
            builder.Property<Guid>("BoardId");
            builder.Property<Guid?>("CurrentPositionId");
            builder.HasOne<Board>().WithMany("previosPositions").HasForeignKey("BoardId");
            builder.HasOne<Board>().WithOne("currentPosition").IsRequired(false).HasForeignKey<Position>("CurrentPositionId");

            builder.HasMany<Square>("squares").WithOne().HasForeignKey("PositionId");
            builder.Property<Guid?>("EnPassentTakableWhitePawnId");
            builder.Property<Guid?>("EnPassentTakableBlackPawnId");
            builder.HasOne<Square?>("enPassentTakablePawnOfWhite").WithOne().HasForeignKey<Position>("EnPassentTakableWhitePawnId");
            builder.HasOne<Square?>("enPassentTakablePawnOfBlack").WithOne().HasForeignKey<Position>("EnPassentTakableBlackPawnId");

            builder.Property("canWhiteCastleKingSide");
            builder.Property("canWhiteCastleQueenSide");
            builder.Property("canBlackCastleKingSide");
            builder.Property("canBlackCastleQueenSide");
            builder.Property("_50MovesRuleCounter");
            builder.Property<Guid>("Id").ValueGeneratedOnAdd();
            builder.HasKey("Id");
        }
    }

 public class SqaureTypeConfiguration : IEntityTypeConfiguration<Square>
    {
        public void Configure(EntityTypeBuilder<Square> builder)
        {
            builder.ToTable("Sqaures");
            builder.Property(s => s.File);
            builder.Property<Guid>("PositionId");
            builder.Property(s => s.Row);
            //this is FK to some other, irrelavant entity.
            builder.HasOne(s => s.Occupier).WithOne().IsRequired(false).HasForeignKey<Square>("OccupierId").IsRequired(false);
            builder.Property<Guid>("Id"); …

我正在尝试在express.js 中获取实际的请求正文JSON。但没能做到。我在互联网上找到的只是如何获取 type 的主体ReqBody，但我想要实际的 JSON，或者更好的是从 ReqBody 查询字段的方法。（在线显示body.username，body.password但是其他字段名称怎么样？我不能只传递字段名称foo并尝试获取body.foo.

这是我到目前为止得到的：

router.post('/', function (req, res, next){
  let body = req.body;
//?????
});

当处理无法通过 完成的文件时StreamReader，通过 允许哪些功能，反之亦然？我检查了文档，它们都有读/写选项，包括更高级的选项。那么我什么时候应该使用它们呢？StreamWriterFileStream