[英]Can't get JSON from IEnumerable in ASP.NET MVC
The problem is that I can't get proper answer JSON to be parsed from IEnumerable, that is very strange by the reason that I did this many time by automated JSON response from MVC controller. 问题是我无法从IEnumerable中解析出正确的JSON答案,这很奇怪,原因是我通过MVC控制器的自动JSON响应做了很多次。
So here is the class: 所以这是课程:
public class Error
{
public Error(string key, string message)
{
Key = key;
Message = message;
}
private string Key { get; set; }
private string Message { get; set; }
}
The extension: 扩展名:
public static class ModelStateHelper
{
public static IEnumerable<Error> ErrorsDictionary(this ModelStateDictionary modelState)
{
if (modelState.IsValid) return null;
var result = from ms in modelState
where ms.Value.Errors.Any()
let fieldKey = ms.Key
let errors = ms.Value.Errors
from error in errors
select new Error(fieldKey, error.ErrorMessage);
return result;
}
}
And finally here is controller: 最后是控制器:
[HttpPost]
public async Task<ActionResult> Add(PermissionsViewModel model)
{
if (!ModelState.IsValid)
{
var errors = ModelState.ErrorsDictionary();
return Json(new {HttpStatusCode = HttpStatusCode.BadRequest, errors});
}
var result = await _ps.Create(model);
return Json(result);
}
The answer I'm receiving is: "errors":[{},{}]}
instead of errors information. 我收到的答案是:
"errors":[{},{}]}
而不是错误信息。
It's because your properties are scoped as private and private properties are not serialized by default in most serialization frameworks(*side note). 这是因为您的属性的作用域为私有,而私有属性在大多数序列化框架中都没有默认序列化(*旁注)。 You can make them public and if you really need to add a private setters.
您可以将它们公开,如果您确实需要添加一个私人二传手。 This way the state will be serialized.
这样状态将被序列化。
public class Error
{
public Error(string key, string message)
{
Key = key;
Message = message;
}
public string Key { get; set; }
public string Message { get; set; }
// option 2 is with private setter but commented out
/*public string Key { get; private set; }
public string Message { get; private set; }*/
}
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