从对HttpClient的Web Api请求中获取自定义验证错误消息

本文关键字：自定义 获取 验证 错误 消息 请求 HttpClient Web Api 从对 | 更新日期: 2023-09-27 18:16:36

我的ASP有以下模型:. NET Web Api 2服务:

public class Message
{
    public int Id { get; set; }
    [Required]
    [StringLength(10, ErrorMessage = "Message is too long; 10 characters max.")]
    public string Text { get; set; }
}

我正在从我的WinForms应用程序发出请求:

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri(BaseAddress);
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    var messageOverTenCharacters = new Message { Text = "OverTenCharacters" }
    var response = await client.PostAsJsonAsync("api/messenger/PushMessage", messageOverTenCharacters);
    // How do I see my custom error message that I wrote in my model class?
}

我如何看到我在模型类中编写的自定义错误消息?

这是我的实现我的验证类，我注册到web api配置:

public class ValidateModelAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        if (actionContext.ModelState.IsValid == false)
        {
            actionContext.Response = actionContext.Request.CreateErrorResponse(
                HttpStatusCode.BadRequest, actionContext.ModelState);
        }
    }
}

从对HttpClient的Web Api请求中获取自定义验证错误消息

我弄清楚了，我需要在我的验证类中设置Response.ReasonPhrase，以便客户端可以看到它(而不仅仅是"BadRequest"):

public class ValidateModelAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        if (actionContext.ModelState.IsValid == false)
        {
            var errors = actionContext.ModelState
                                      .Values
                                      .SelectMany(m => m.Errors
                                                        .Select(e => e.ErrorMessage));
            actionContext.Response = actionContext.Request.CreateErrorResponse(
                HttpStatusCode.BadRequest, actionContext.ModelState);
            actionContext.Response.ReasonPhrase = string.Join("'n", errors);
        }
    }
}
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