Question

我在dotnet core 2.1上的项目中使用的是Razor页面，并且应用程序似乎无法正确绑定我的属性，简单类型（int和字符串类型）可以正确绑定，但复杂类型列表却不能正确绑定有解决的办法吗？

我的页面处理程序如下：

public async Task<IActionResult> OnGetDTResponseAsync(DataTableOptions options) {// Some Code}

当我逐步使用调试器进行调试时，“ DataTableOptions选项”的所有简单类型属性都会得到很好的填充，但是复杂类型将返回null。

我的模型如下：

public class DataTableOptions
{
    public string Draw { get; set; }
    public int Start { get; set; }
    public int Length { get; set; }
    public List<DataTableColumnOrder> Order { get; set; }
    public List<DataTableColumn> Columns { get; set; }
    public DataTableColumnSearch Search { get; set; }
    public List<string> Params { get; set; }

    public DataTableOptions() { }

    public class DataTableColumn
    {
        public string Data { get; set; }
        public string Name { get; set; }
        public bool Searchable { get; set; }
        public bool Orderable { get; set; }
        public DataTableColumnSearch Search { get; set; }

        public DataTableColumn() { }
    }

    public class DataTableColumnSearch
    {
        public string Value { get; set; }
        public bool Regex { get; set; }

        public DataTableColumnSearch() { }
    }

    public class DataTableColumnOrder
    {
        public int Column { get; set; }
        public string Dir { get; set; }

        public DataTableColumnOrder() { }
    }
}

在尝试解决此问题时，我尝试使用

public async Task<IActionResult> OnGetDTResponseAsync(List<Dictionary<string, string>> columns)

在页面处理程序中

代替DataTableOptions的columns属性，因此我可以手动将属性绑定到我的类：我获得了列的完整列表，该列绑定了它的属性，除了DataTableColumn的DataTableColumnSearch属性出现为null的复杂类型。

public async Task<IActionResult> OnGetDTResponseAsync(List<Dictionary<string, object>> columns)

也不起作用。

这是提琴手中的请求：

GET / CMS / Index？handler = DTResponse＆draw = 1＆columns％5B0％5D％5Bdata％5D = id＆columns％5B0％5D％5Bname％5D =＆columns％5B0％5D％5Bsearchable％5D = false＆columns％5B0％5D％5Bsearchable％5D = false＆columns％5B0％5D ％5D = false＆columns％5B0％5D％5Bsearch％5D％5Bvalue％5D =＆columns％5B0％5D％5Bsearch％5D％5Bregex％5D = false＆columns％5B1％5D％5Bdata％5D = name＆columns％5B1％5D％5Bdata％5D = name＆columns％5B1％5D％5Bdata％5D = name＆Columns =＆columns％5B1％5D％5Bsearchable％5D = true＆columns％5B1％5D％5Borderable％5D = true＆columns％5B1％5D％5Bsearch％5D％5Bvalue％5D =＆columns％5B1％5D％5Bsearch％5D％5Bregex％5D = false ％5B2％5D％5Bdata％5D = webPage.name＆columns％5B2％5D％5Bname％5D =＆columns％5B2％5D％5Bsearchable％5D = true＆columns％5B2％5D％5Borderable％5D = true＆columns％5B2％5D％5Borderable％5D = true＆columns％5B2％5D％5Borderable％5D = true＆columns％5B2％5D％5D ％5Bvalue％5D =＆columns％5B2％5D％5Bsearch％5D％5Bregex％5D = false＆columns％5B3％5D％5Bdata％5D = value＆columns％5B3％5D％5Bname％5D =＆columns％5B3％5D％5Bsearchable％5D = true ％5B3％5D％5Borderable％5D = true＆columns％5B3％5D％5Bsearch％5D％5Bvalue％5D =＆columns％5B3％5D％5Bsearch％5D％5Bregex％5D = false＆columns％5B4％5D％5Bdata％5D = contentType.name＆columns ％5B4％5D％5Bname％5D =＆columns％5B4％5D％5Bsearchable％5D = true＆col umns％5B4％5D％5Borderable％5D = true＆columns％5B4％5D％5Bsearch％5D％5Bvalue％5D =＆columns％5B4％5D％5Bsearch％5D％5Bregex％5D = false＆columns％5B5％5D％5Bdata％5D =＆columns 5B5％5D％5Bname％5D =＆columns％5B5％5D％5Bsearchable％5D = false＆columns％5B5％5D％5Borderable％5D = false＆columns％5B5％5D％5Bsearch％5D％5Bvalue％5D =＆columns％5B5％5D％5B％ 5D％5Bregex％5D = false＆order％5B0％5D％5Bcolumn％5D = 2＆order％5B0％5D％5Bdir％5D = asc＆start = 0＆length = 10＆search％5Bvalue％5D =＆search％5Bregex％5D = false＆_ = 1545122652329 HTTP / 1.1

Answer 1

我必须构建一个自定义模型绑定类来处理这种情况。由于某种原因，在核心2.1 -Razor页面中不能正确地正确绑定具有另一个复杂对象作为其属性的一部分的复杂对象的收集列表。

请在下面查看我的解决方案：

using Microsoft.AspNetCore.Mvc.ModelBinding;
using RestaurantDataModel.Data.Requests;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace ExampleDataModel.Data
{
public class CustomDataTableEntityBinder : IModelBinder
{
    public Task BindModelAsync(ModelBindingContext bindingContext)
    {
        if (bindingContext == null)
        {
            throw new ArgumentNullException(nameof(bindingContext));
        }

        var allValues = bindingContext.HttpContext.Request.Query;
        DataTableOptions DTOs = new DataTableOptions {
            Draw = allValues.FirstOrDefault(a => a.Key == "draw").Value,
            Start = Convert.ToInt32(allValues.FirstOrDefault(a => a.Key == "start").Value),
            Length = Convert.ToInt32(allValues.FirstOrDefault(a => a.Key == "length").Value)
        };

        if (allValues.Any(a => a.Key.Length > 9 && a.Key.Substring(0, 9).Contains("columns")))
        {
            var myListIndex = 0;
            var myListIndexComparer = 0;
            var allColumns = allValues.Where(a => a.Key.Length > 9 && a.Key.Substring(0, 9).Contains("columns")).ToList();
            DataTableColumn DTC = new DataTableColumn();
            DataTableColumnSearch DTCS = new DataTableColumnSearch();
            DTOs.columns = new List<DataTableColumn>();
            foreach (var column in allColumns)
            {
                var perColumnArray = column.Key.Split(new char[] { '[', ']' }, StringSplitOptions.RemoveEmptyEntries);
                var rawIndex = perColumnArray[1];

                if (!int.TryParse(rawIndex, out myListIndex))
                {
                    return Task.CompletedTask;
                }

                if (myListIndexComparer != myListIndex)
                {
                    DTC.search = DTCS;
                    DTOs.columns.Add(DTC);
                    DTC = new DataTableColumn();
                    DTCS = new DataTableColumnSearch();
                }
                myListIndexComparer = myListIndex;
                switch (perColumnArray[2])
                {
                    case "data":
                        DTC.data = column.Value;
                        break;
                    case "name":
                        DTC.name = column.Value;
                        break;
                    case "searchable":
                        DTC.searchable = String.IsNullOrWhiteSpace(column.Value) ? false : Convert.ToBoolean(column.Value);
                        break;
                    case "orderable":
                        DTC.orderable = String.IsNullOrWhiteSpace(column.Value) ? false : Convert.ToBoolean(column.Value);
                        break;
                    case "search":
                        if (perColumnArray[3] == "regex")
                        {
                            DTCS.regex = String.IsNullOrWhiteSpace(column.Value) ? false : Convert.ToBoolean(column.Value);
                        }
                        if (perColumnArray[3] == "value")
                        {
                            DTCS.value = column.Value;
                        }
                        break;
                }

                if(allColumns.IndexOf(column) == allColumns.IndexOf(allColumns.Last()))
                {
                    DTC.search = DTCS;
                    DTOs.columns.Add(DTC);
                }
            }
        }
        if (allValues.Any(a => a.Key.Length > 7 && a.Key.Substring(0, 7).Contains("order")))
        {
            var myListIndex = 0;
            var myListIndexComparer = 0;
            var allOrders = allValues.Where(a => a.Key.Length > 7 && a.Key.Substring(0, 7).Contains("order")).ToList();
            DataTableColumnOrder DTCO = new DataTableColumnOrder();
            DTOs.order = new List<DataTableColumnOrder>();
            foreach (var order in allOrders)
            {
                var perColumnArray = order.Key.Split(new char[] { '[', ']' }, StringSplitOptions.RemoveEmptyEntries);
                var rawIndex = perColumnArray[1];

                if (!int.TryParse(rawIndex, out myListIndex))
                {
                    return Task.CompletedTask;
                }

                if (myListIndexComparer != myListIndex)
                {
                    DTOs.order.Add(DTCO);
                    DTCO = new DataTableColumnOrder();
                }
                myListIndexComparer = myListIndex;
                switch (perColumnArray[2])
                {
                    case "column":
                        DTCO.Column = Convert.ToInt32(order.Value);
                        break;
                    case "dir":
                        DTCO.Dir = order.Value;
                        break;
                }
                if(allOrders.IndexOf(order) == allOrders.IndexOf(allOrders.Last()))
                {
                    DTOs.order.Add(DTCO);
                }
            }
        }
        if (allValues.Any(a => a.Key.Length > 7 && a.Key.Substring(0, 8).Contains("search")))
        {
            var allSearches = allValues.Where(a => a.Key.Length > 8 && a.Key.Substring(0, 8).Contains("search")).ToList();
            DataTableColumnSearch DTCS = new DataTableColumnSearch();
            DTOs.search = new DataTableColumnSearch();
            foreach (var search in allSearches)
            {
                var perColumnArray = search.Key.Split(new char[] { '[', ']' }, StringSplitOptions.RemoveEmptyEntries);

                switch (perColumnArray[1])
                {
                    case "value":
                        DTCS.value = search.Value;
                        break;
                    case "regex":
                        DTCS.regex = String.IsNullOrWhiteSpace(search.Value) ? false : Convert.ToBoolean(search.Value);
                        break;
                }
                if(allSearches.IndexOf(search) == allSearches.IndexOf(allSearches.Last()))
                {
                    DTOs.search = DTCS;
                }
            }
        }

        bindingContext.Result = ModelBindingResult.Success(DTOs);
        return Task.CompletedTask;
    }
}

}

然后将其添加到模型类的顶部：

[ModelBinder(BinderType = typeof(CustomDataTableEntityBinder))]

绑定复杂类型对象列表的问题-Dotnet Core 2.1剃须刀页面

1 个答案: