未处理的异常：类型 \'List<dynamic>\' 不是类型 \'List<InvoiceItemDto>?\' 的子类型

Question

我有这个列表 JSON 输出

 "invoiceItems": [
          {
            "description": null,
            "id": "13",
          }
        ],

我使用下面的代码将其转换为List<InvoiceItemDto>

 invoiceItems: json['invoiceItems'].map((data) => InvoiceItemDto.fromJson(data)).toList(),

但它抛出我错误

 Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'List<InvoiceItemDto>?'

invoice_item_dto.dart 文件

class InvoiceItemDto {
  final int? id;
  final String? description;    

  const InvoiceItemDto({
   this.id,
   this.description,
  });

  factory InvoiceItemDto.fromJson(Map<String, dynamic> json) {
    return InvoiceItemDto(
      id: json['id'],
      description: json['address'],
    );
  }

  InvoiceItemEntity toInvoiceItemEntity() {
    return InvoiceItemEntity(
      id: id,description: description);
  }
}

Answer 1

尝试使用List.from

invoiceItems: List.from(json['invoiceItems'].map((data) => InvoiceItemDto.fromJson(data)));