.NET核心自定义模型绑定器调用默认模型绑定器

我正在尝试在.NETCore中实现一些中间件，将小数舍入到小数点后2位。所有其他映射都可以通过

ComplexTypeModelBinder

像当前一样工作。我曾尝试在调用绑定器之前调用该绑定器，或从中继承，但当模型到达控制器时，它最终将为null

---

本质上，我所追求的功能与此处所要求的相同：，但针对.NET core。

请发布一些代码将其作为第一个模型绑定器插入

ModelBinders.Binders.Insert（typeof（Decimal），new DateTimeModelBinder（），0）我认为正确的答案，或接近正确答案的答案，将是使用DI并注入您需要的众多绑定之一：为您的代码编写一些描述并正确格式化代码。
public class JqGridModelBinder : IModelBinder
{
    public Task BindModelAsync(ModelBindingContext bindingContext)
    {
        if (bindingContext == null)
        {
            throw new ArgumentNullException(nameof(bindingContext));
        }

        var request = bindingContext?.ActionContext?.HttpContext?.Request;

        var param = new JqGridParam
        {
            isSearch = bool.Parse(request.Query["_search"]),
            pageIndex = int.Parse(request.Query["page"]),
            pageSize = int.Parse(request.Query["rows"]),
            sortColumn = request.Query["sidx"].ToString(),
            sortOrder = request.Query["sord"].ToString(),
            id = request.Query["id"].ToString(),
            param = request.Query["oper"].ToString(),
            editOper = request.Query["edit"].ToString(),
            addOper = request.Query["add"].ToString(),
            delOper = request.Query["del"].ToString(),
            @where = JqGridFilter.Create(request.Query["filters"]),
            //operation = (OPERATION)System.Enum.Parse(typeof(OPERATION), request.Query["oper"]=="null" ? "none": request.Query["oper"].ToString())
        };
        bindingContext.Result = ModelBindingResult.Success(param);

        return Task.CompletedTask;
    }
}

public enum OPERATION
    {
        none,
        add,
        del,
        edit,
        excel
    }
    [ModelBinder(BinderType = typeof(JqGridModelBinder))]
    public class JqGridParam
    {
        [BindRequired]
        public int pageIndex { get; set; }
        [BindRequired]
        public int pageSize { get; set; }
        [BindRequired]
        public string sortColumn { get; set; }
        [BindRequired]
        public string sortOrder { get; set; }
        [BindRequired]
        public bool isSearch { get; set; }
        [BindRequired]
        public string id { get; set; }
        [BindRequired]
        public string param { get; set; }
        [BindRequired]
        public string editOper { get; set; }
        [BindRequired]
        public string addOper { get; set; }
        [BindRequired]
        public string delOper { get; set; }
        [BindRequired]
        public JqGridFilter where { get; set; }
        [BindRequired]
        public OPERATION operation { get; set; }

    }

    [DataContract]
    public class JqGridFilter
    {
        [DataMember]
        public string groupOp { get; set; }

        [DataMember]
        public Rule[] rules { get; set; }

        public static JqGridFilter Create(string jsonData)
        {
            try
            {
                var serializer = new DataContractJsonSerializer(typeof(JqGridFilter));
                //System.IO.StringReader reader = new System.IO.StringReader(jsonData);
                System.IO.MemoryStream ms = new System.IO.MemoryStream(Encoding.Default.GetBytes(jsonData));
                return serializer.ReadObject(ms) as JqGridFilter;
            }
            catch
            {
                return null;
            }
        }
    }

    [DataContract]
    public class Rule
    {
        [DataMember]
        public string field { get; set; }

        [DataMember]
        public string op { get; set; }

        [DataMember]
        public string data { get; set; }
    }