Question

我想按名称订购我的货币代码（名称），而不是ID。

我在每个货币的数据库ID和代码中都有。

在asp.net中我有这段代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using IGP.Presentation.BOPortalFacade;
using Portal.Framework.Mvc.Extensions;
using IGP.Common.Windsor;
using IGP.Presentation.BOPortalFacade.DTOs.GlobalizationService;
using System.Web.Mvc;
using Portal.Framework.Services.Resources;

namespace Portal.Framework.Mvc.ViewDataPreparers
{
  public class CurrenciesCodesPreparer : ActionFilterAttribute, IDataPreparer<Currency>
  {
    public IList<Currency> GetDataItems()
    {
      return DefaultContainerReference.Resolve<IGlobalizationService>().GetAllCurrencies().CurrencyList;
    }

    public static string ViewDataKey { get { return "CurrenciesCodes"; } }

    public override void OnActionExecuting(System.Web.Mvc.ActionExecutingContext filterContext)
    {
      base.OnActionExecuting(filterContext);
      filterContext.Controller.ViewData[ViewDataKey] = GetDataItems().ToSelectableList(true, Resources.Default_All, null, null, "Id", "Code");
    }
  }
}

我尝试添加以下代码

filterContext.Controller.ViewData[ViewDataKey] = GetDataItems().OrderBy(x => x.Code).ToSelectableList(true, Resources.Default_All, null, null, "Id", "Code");

最后但有错误。请参阅附件中的

ToSelectableList有以下代码：

public static IList<SelectListItem> ToSelectableList<T>(
      this IList<T> items,
      bool addDefaultItem = true,
      string defaultItemName = DefaultItemName,
      int? defaultItemValue = DefaultItemValue,
      object selectedItemValue = null,
      string defaultDataValueField = DefaultDataValueField,
      string defaultDataTextField = DefaultDataTextField,
      bool selectAllItems = false)
    {
      // resolve from resources
      if (defaultItemValue.Equals(DefaultItemName))
        defaultItemName = Resources.GetResourceValue(AllResourceKey);

      var resultList = new List<SelectListItem>();
      if (items != null && items.Count > 0)
      {
        var itemSelectList = new SelectList(items, defaultDataValueField, defaultDataTextField, selectedItemValue);

        resultList =
          itemSelectList.Select(
            x =>
            new SelectListItem
              {
                Text = x.Text.ToString(CultureInfo.InvariantCulture),
                Value = x.Value.ToString(CultureInfo.InvariantCulture)
              }).ToList();
      }

      if ((selectAllItems) && (!addDefaultItem) && (selectedItemValue == null)) //in case you have multi select
      {
        foreach (var selectListItem in resultList)
        {
          selectListItem.Selected = true;
        }
      }

      if (addDefaultItem)
      {
        resultList.Insert(
          0,
          new SelectListItem { Text = defaultItemName, Value = defaultItemValue == null ? "" : defaultItemValue.ToString() });
      }

      return resultList;
    }

Answer 1

您的扩展程序ToSelectableList()接受IList<>类型的第一个参数而不是IOrderedEnumerable<>。您应该将扩展名定义重写为

public static IList<SelectListItem> ToSelectableList<T>(
      this IEnumerable<T> items,
      bool addDefaultItem = true,
      string defaultItemName = DefaultItemName,
      int? defaultItemValue = DefaultItemValue,
      object selectedItemValue = null,
      string defaultDataValueField = DefaultDataValueField,
      string defaultDataTextField = DefaultDataTextField,
      bool selectAllItems = false)

因此，它不会在使用IOrderedEnumerable<>

时引发错误

想要在C＃中按名称ASC订购货币

1 个答案: