Question

我正在使用asp.net webapi创建和api 出于某些原因，这个json：

JSON => {"page":"1","count":"10","sorting[name]":"asc"}
JSONString = >"{\"page\":\"1\",\"count\":\"10\",\"sorting[name]\":\"asc\"}"

没有正确地将bindend传递给这样的模型：

 public class DataSourceRequestParams
    {
        public int Page { get; set; }
        public int Count { get; set; }
        public IDictionary<string, string> Sorting { get; set; }
        public IDictionary<string, string> Filter { get; set; }
        public IDictionary<string, string> Order { get; set; }
    }

Sorting属性没有绑定。

[HttpPost]
        public PagingResult<ApplicationUser> Get([FromBody] DataSourceRequestParams @params)
        {...}

如果我在MVC应用程序中创建一个动作并传递相同的JSON，它就会被绑定。

我在这里遗漏了什么吗？

Answer 1

当Content-Type为application / json时，Web API中的绑定需要Dictionary作为JSON对象，因此以下JSON将与您的模型正确绑定：

{"page":"1","count":"10","sorting":{"name":"asc"}}

修改

如果您无法更改传入的JSON，则需要手动将JSON绑定到对象。这里有几个选择。您可以编写自己的IModelBinder，也可以通过编写自己的JsonConverter来覆盖JSON活页夹的行为。

作为一个粗略的例子，您可以像这样创建一个JsonConverter：

public class DictionaryConverter : JsonConverter { public DictionaryConverter() { } public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { //I've not implemented writing the Json throw new NotImplementedException(); } public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) { //create a new object var temp = new DataSourceRequestParams(); temp.Sorting = new Dictionary<string, string>(); temp.Filter = new Dictionary<string, string>(); temp.Order = new Dictionary<string, string>(); //load the input into a JObject and grab the "simple" values JObject jsonObject = JObject.Load(reader); temp.Page = jsonObject["page"].Value<int>(); temp.Count = jsonObject["count"].Value<int>(); //parse the dictionary values AddValuesToDictionary(temp, jsonObject, "sorting", temp.Sorting); AddValuesToDictionary(temp, jsonObject, "filter", temp.Filter); AddValuesToDictionary(temp, jsonObject, "order", temp.Order); return temp; } private void AddValuesToDictionary(DataSourceRequestParams test, JObject jsonObject, string name, IDictionary<string, string> dictionary) { //grab each matching property var properties = jsonObject.Properties().Where(j => j.Name.StartsWith(name)); if (properties != null) { foreach (var property in properties) { /*for each matched property grab the value between the brackets * from the name and the property value * and the associate json value and add it to the dictionary */ dictionary.Add(Regex.Match(property.Name, @"\[([^\]]*)\]").Groups[1].Value, property.Value.Value<string>()); } } } public override bool CanConvert(Type objectType) { //we can convert if the type is DataSourceRequestParams return typeof(DataSourceRequestParams).IsAssignableFrom(objectType); } }

然后在GlobalConfiguration中注册新转换器：

GlobalConfiguration.Configuration.Formatters.JsonFormatter .SerializerSettings.Converters.Add(new DictionaryConverter());

然后您的原始JSON将正确解析。显然，代码没有所有错误处理等，所以它不是生产准备好的。

JSON在Web Api操作中无法正确绑定

1 个答案: