c# - 从 Net Core 2.2 Web API 中的响应获取错误消息

Question

我用空的用户名和密码调用 Register 方法。所以我收到了这个结果:

{
    "errors": {
        "Password": [
            "The Password field is required.",
            "Password length is between 4 and 8."
        ],
        "Username": [
            "The Username field is required."
        ]
    },
    "title": "One or more validation errors occurred.",
    "status": 400,
    "traceId": "0HLJIO56EGJEV:00000001"
}

我的 DTO:

public class UserForRegisterDto
{
    [Required]
    public string Username { get; set; }
    [Required]
    [StringLength(8, MinimumLength = 4, ErrorMessage = "Password length is between 4 and 8.")]
    public string Password { get; set; }
}

我只想从响应中获取错误属性，我该怎么办？

Answer 1

这是一个 new feature在 ASP.NET Core 2.2 中:

An IActionResult returning a client error status code (4xx) now returns a ProblemDetails body.

docs描述在 ConfigureServices 中调用 AddMvc 时可以禁用它，如下所示:

services.AddMvc()
    .SetCompatibilityVersion(CompatibilityVersion.Version_2_2)
    .ConfigureApiBehaviorOptions(options =>
    {
        options.SuppressUseValidationProblemDetailsForInvalidModelStateResponses = true;
    });

这将导致 2.2 之前的行为，即仅序列化错误。