Question

我正在尝试在.NET Core中实现一些中间件，它将小数位数舍入为2位小数。所有其他映射都可以通过ComplexTypeModelBinder正常工作。我已经尝试过在我之前调用该绑定器或继承它，但它最终会导致模型在触及控制器时为空。

基本上我的功能与此处要求的相同：Call Default Model Binder from a Custom Model Binder?，但对于.NET核心。

Answer 1

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;
    }
}

Answer 2

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; }
    }

.NET Core Custom模型绑定器调用默认模型绑定器

2 个答案: