.NET 5.0 Web API不适用于具有必需属性的记录 [英] .NET 5.0 Web API won't work with record featuring required properties

问题描述

我使用C#9.0 record 类型作为.NET 5.0 Web API项目的绑定模型.一些属性是必需的.

I'm using a C# 9.0 record type as a binding model for a .NET 5.0 Web API project. Some of the properties are required.

我正在使用 record 位置语法，但收到错误.

I'm using the record positional syntax, but am receiving errors.

public record Mail(
    System.Guid? Id,
    [property: Required]
    string From,
    [property: Required]
    string[] Tos,
    [property: Required]
    string Subject,
    string[]? Ccs,
    string[]? Bccs,
    [property: Required]
    Content[] Contents,
    Attachment[]? Attachments
);

然后将其作为我的 Index 操作的绑定模型公开:

This is then exposed as the binding model for my Index action:

public async Task<ActionResult> Index(Service.Models.Mail mailRequest)
{
    …
}

但是，每当我尝试发出请求时，都会出现以下错误:

Whenever I try to make a request, however, I receive the following error:

记录类型'Service.Models.Mail'具有在属性'Contents'上定义的验证元数据，该数据将被忽略.内容"是记录主构造函数中的一个参数，并且验证元数据必须与该构造函数参数相关联.

Record type 'Service.Models.Mail' has validation metadata defined on property 'Contents' that will be ignored. 'Contents' is a parameter in the record primary constructor and validation metadata must be associated with the constructor parameter.

我尝试删除了 Contents 属性上的属性，但是下一个(先前的)属性却失败了.我尝试使用 [param:…] 代替 [property:…] ，并混合它们，但始终会出现相同的错误.

I tried removing the attribute on the Contents property, but it then fails for the next (prior) property. I tried using [param: …] instead of [property: …], as well as mixing them, but keep getting the same kind of error.

我环顾四周，没有发现关于C#9记录以不同方式处理批注的任何建议.我已尽力而为，但除了将记录转换为POCO之外，我一无所有.

I looked around the web, and haven't found any suggestion of handling annotations differently for C# 9 records. I did my best, but I'm out of ideas—outside of converting my records to POCOs.

推荐答案

我放弃了使用Positional构造函数，并且对属性进行了详细的完整声明，因此可以正常工作.

I gave up using Positional constructor, and with the verbose full declaration of the properties, it works.

public record Mail
{
    public System.Guid? Id { get; init; }

    [Required]
    public string From { get; init; }

    [Required]
    public string[] Tos { get; init; }

    [Required]
    public string Subject { get; init; }

    public string[]? Ccs { get; init; }

    public string[]? Bccs { get; init; }

    [Required]
    public Content[] Contents { get; init; }

    public Attachment[]? Attachments { get; init; }

    public Status? Status { get; init; }

    public Mail(Guid? id, string @from, string[] tos, string subject, string[]? ccs, string[]? bccs, Content[] contents, Attachment[]? attachments, Status status)
    {
        Id = id;
        From = @from;
        Tos = tos;
        Subject = subject;
        Ccs = ccs;
        Bccs = bccs;
        Contents = contents;
        Attachments = attachments;
        Status = status;
    }
}

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