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綁定復(fù)雜類型對象列表的問題 - Dotnet Core 2.1 Razor Pages

C#

慕尼黑8549860 2022-06-19 09:49:10

我在 dotnet core 2.1 上為我的項(xiàng)目使用 Razor 頁面，應(yīng)用程序似乎沒有正確綁定我的屬性，簡單類型（int 和 string 類型）正確綁定但不是復(fù)雜類型列表，有沒有工作為了這個？我的頁面處理程序如下所示：public async Task<IActionResult> OnGetDTResponseAsync(DataTableOptions options) {// Some Code}當(dāng)我使用調(diào)試器逐步完成時，“DataTableOptions 選項(xiàng)”的所有簡單類型屬性都填充得很好，但復(fù)雜類型返回 null。我的模型看起來像這樣：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() { } }}在嘗試解決此問題時，我嘗試使用public async Task<IActionResult> OnGetDTResponseAsync(List<Dictionary<string, string>> columns)在我的頁面處理程序中代替 DataTableOptions 的 columns 屬性，所以我可以手動將屬性綁定到我的類：我得到了我的列的完整列表，它的屬性綁定到它，除了 DataTableColumn 的 DataTableColumnSearch 屬性，它也是一個復(fù)雜類型結(jié)果為空。public async Task<IActionResult> OnGetDTResponseAsync(List<Dictionary<string, object>> columns) 也不行。這是 fiddler 中請求的樣子：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%5Borderable%5D= false&columns%5B0%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B0%5D%5Bsearch%5D%5Bregex%5D=false&columns%5B1%5D%5Bdata%5D=名稱&columns%5B1%5D%5Bname%5D=&columns%

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1 回答

牧羊人nacy

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我必須構(gòu)建一個自定義模型綁定類來處理這種情況。出于某種原因，具有另一個復(fù)雜對象作為其屬性的一部分的復(fù)雜對象的集合列表無法在核心 2.1 -Razor 頁面中自動正確綁定。

請參閱下面的解決方案：

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;

}

然后我將它添加到我的模型類的頂部：

[ModelBinder(BinderType = typeof(CustomDataTableEntityBinder))]

反對回復(fù) 2022-06-19

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綁定復(fù)雜類型對象列表的問題 - Dotnet Core 2.1 Razor Pages

綁定復(fù)雜類型對象列表的問題 - Dotnet Core 2.1 Razor Pages

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