WebAPI JsonConverter for x-www-form-urlencoded无法正常工作

时间:2016-09-30 12:56:15

标签: c# asp.net asp.net-mvc-4 asp.net-web-api asp.net-web-api2

我创建了具有JsonConverter属性的简单模型:

public class MyModel
{
    [JsonProperty(PropertyName = "my_to")]
    public string To { get; set; }

    [JsonProperty(PropertyName = "my_from")]
    public string From { get; set; }

    [JsonProperty(PropertyName = "my_date")]
    [JsonConverter(typeof(UnixDateConverter))]
    public DateTime Date { get; set; }
}

和我的转换器:

public sealed class UnixDateConverter : JsonConverter
{
    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (!CanConvert(reader.ValueType))
        {
            throw new JsonSerializationException();
        }

        return DateTimeOffset.FromUnixTimeSeconds((long)reader.Value).ToUniversalTime().LocalDateTime;
    }

    public override bool CanConvert(Type objectType)
    {
        return Type.GetTypeCode(objectType) == TypeCode.Int64;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        var datetime = (DateTime) value;
        var dateTimeOffset = new DateTimeOffset(datetime.ToUniversalTime());
        var unixDateTime = dateTimeOffset.ToUnixTimeSeconds();
        writer.WriteValue(unixDateTime);
    }
}

当我从Postman发送请求并将内容类型设置为application/json时,一切正常 - 我的转换器工作正常,调试器在转换器的断点处停止,但我必须使用x-www-form-urlencoded

在将数据作为JsonConverter发送时,是否可以选择在模型中使用x-www-form-urlencoded属性?

1 个答案:

答案 0 :(得分:0)

我设法通过创建实现IModelBinder

的自定义模型绑定器来实现此目的

以下是我的活页夹的通用版本:

internal class GenericModelBinder<T> : IModelBinder where T : class, new()
{
    public bool BindModel(HttpActionContext actionContext, ModelBindingContext bindingContext)
    {
        if (bindingContext.ModelType != typeof (T))
        {
            return false;
        }

        var model = (T) bindingContext.Model ?? new T();

        JObject @object = null;

        var task = actionContext.Request.Content.ReadAsAsync<JObject>().ContinueWith(t => { @object = t.Result; });
        task.Wait();

        var jsonString = @object.ToString(Formatting.None);
        JsonConvert.PopulateObject(jsonString, model);
        bindingContext.Model = model;

        return true;
    }
}

以下是示例用法:

[Route("save")]
[HttpPost]
public async Task<IHttpActionResult> Save([ModelBinder(typeof (GenericModelBinder<MyModel>))] MyModel model)
{
    try
    {
        //do some stuff with model (validate it, etc)
        await Task.CompletedTask;
        DbContext.SaveResult(model.my_to, model.my_from, model.my_date);
        return Content(HttpStatusCode.OK, "OK", new TextMediaTypeFormatter(), "text/plain");
    }
    catch (Exception e)
    {
        Debug.WriteLine(e);
        Logger.Error(e, "Error saving to DB");
        return InternalServerError();
    }
}

我不确定JsonProperty和JsonConverter属性是否有效,但他们应该这样做。

我知道这可能不是最好的方法,但这段代码对我有用。任何建议都非常受欢迎。