用于将数据组合成多部分表单的接口。
为了为那些希望生成多部分表单数据但又不想强迫大多数用户参考RFC 2388的人提供更精细的控制，Unity 提供了这个简单的接口，UnityWebRequest API 可以使用它将复杂数据序列化成格式正确的字节。
为了方便起见，两种通用类型的表单部分已封装到 IMultipartFormSection 的两个库存实现中。两种库存实现都只是通过它们的构造函数进行控制。
IMultipartFormSection 实现者通过 [UnityWebRequest.SerializeFormSections] 转换为字节。
其他资源: [MultipartFormDataSection]、[MultipartFormFileSection]。
| contentType | 返回此表单部分的 Content-Type 标头中要使用的值。 |
| fileName | 返回一个字符串，表示此部分在目标服务器上的所需文件名。 |
| sectionData | 返回此部分中包含的原始二进制数据。不得返回 null 或零长度数组。 |
| sectionName | 返回此部分的名称（如果有）。 |
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