c# - WebAPI : Creating custom BadRequest status outside of ApiController

Question

使用 .NET Core 2.0 WebApi。

我有一个 webapi，它有许多端点，每个端点都在处理并在失败时抛出 BadRequest。如下:

if(data == null)
{
   return BadRequest("Data must not be blank.");
}

现在，由于这些状态代码在我的 API 中重复出现，我正在考虑创建一个 Helper 方法，它将 BadRequest 返回给我的 API。

所以我创建了一个静态助手类。但这里的问题是 BadRequest 是 ControllerBase 的一部分，在我的助手类中不可用。创建此返回 BadRequest 的方法的最佳方法是什么。

--已更新---

我想要这样的东西:

    public static BadRequest GetBadRequestMessage(string message)
    {
        return BadRequest(message);
    }

我也试过:

    public static BadRequestResult GetBadRequestMessage(string message)
    {
        return new  BadRequestResult(message);
    }

但这会产生错误:严重性代码描述项目文件行抑制状态错误 CS1729“BadRequestResult”不包含采用 1 个参数的构造函数

Answer 1

可以手动初始化 Action 结果

return new BadRequestObjectResult("error message here");

这基本上就是 ControllerBase 内部所做的事情

/// <summary>
/// Creates an <see cref="BadRequestResult"/> that produces a <see cref="StatusCodes.Status400BadRequest"/> response.
/// </summary>
/// <returns>The created <see cref="BadRequestResult"/> for the response.</returns>
[NonAction]
public virtual BadRequestResult BadRequest()
    => new BadRequestResult();

/// <summary>
/// Creates an <see cref="BadRequestObjectResult"/> that produces a <see cref="StatusCodes.Status400BadRequest"/> response.
/// </summary>
/// <param name="error">An error object to be returned to the client.</param>
/// <returns>The created <see cref="BadRequestObjectResult"/> for the response.</returns>
[NonAction]
public virtual BadRequestObjectResult BadRequest(object error)
    => new BadRequestObjectResult(error);

/// <summary>
/// Creates an <see cref="BadRequestObjectResult"/> that produces a <see cref="StatusCodes.Status400BadRequest"/> response.
/// </summary>
/// <param name="modelState">The <see cref="ModelStateDictionary" /> containing errors to be returned to the client.</param>
/// <returns>The created <see cref="BadRequestObjectResult"/> for the response.</returns>
[NonAction]
public virtual BadRequestObjectResult BadRequest(ModelStateDictionary modelState)
{
    if (modelState == null)
    {
        throw new ArgumentNullException(nameof(modelState));
    }

    return new BadRequestObjectResult(modelState);
}

Source