dotnet5踩坑入门记

开启请求参数验证

[HttpPost]
public IActionResult Save([FromBody] User user)
{
    string errorMessage = string.Empty;
    if (!ModelState.IsValid)
    {
        foreach (var item in ModelState.Values)
        {
            foreach (var error in item.Errors)
            {
                errorMessage += error.ErrorMessage + "|";
            }
        }
    }
    if (!string.IsNullOrEmpty(errorMessage))
    {
        return BadRequest(errorMessage);
    }
    return Ok(user);
}

public class User
{
    [Required(ErrorMessage = "账号不能为空")]
    [StringLength(20)]
    public string name { get; set; }
    [Required()]
    [StringLength(40)]
    public string password { get; set; }
}

默认情况下并不会进入控制器返回errorMessage
而是报被框架内置捕获异常返回

{
    "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
    "title": "One or more validation errors occurred.",
    "status": 400,
    "traceId": "00-7be909892e5fc14697682fffa2149fd3-d992eb52c5214b4f-00",
    "errors": {
        "name": [
            "账号不能为空"
        ],
        "password": [
            "The password field is required."
        ]
    }
}

如果我们要自己写验证判断的话
得修改Startup.cs的ConfigureServices方法

public void ConfigureServices(IServiceCollection services)
{

    services.AddControllers()
    .ConfigureApiBehaviorOptions(options =>
    {
        // 关掉参数验证强制报错
        options.SuppressModelStateInvalidFilter = true;
    });
}