阻止專案添加到字典-有解無憂

除了這個問題：

我想在 3 級類別中創建一個分層串列。

我的資料有以下幾種方式：

var appCategoryList = new List<AppCategoryDataModel>() {
    new AppCategoryDataModel() { AppCategoryId = 4844, ParentappCategoryId = null , AppCategoryName = "ItemResearch", ProtocolId = 5164, ProtocolTitle="ABC: Evaluation" },
    new AppCategoryDataModel() { AppCategoryId = 4844, ParentappCategoryId = null, AppCategoryName = "ItemResearch", ProtocolId = null, ProtocolTitle=""},
    new AppCategoryDataModel() { AppCategoryId = 4845, ParentappCategoryId = null, AppCategoryName = "ItemHostpital", ProtocolId = null, ProtocolTitle="" },
    new AppCategoryDataModel() { AppCategoryId = 4845, ParentappCategoryId = null, AppCategoryName = "ItemHostpital", ProtocolId =5162 , ProtocolTitle="ABC: 3/28/20" },
    new AppCategoryDataModel() { AppCategoryId = 4845, ParentappCategoryId = null, AppCategoryName = "ItemHostpital", ProtocolId =5164 , ProtocolTitle="ABC: Evaluation" },
    new AppCategoryDataModel() { AppCategoryId = 4845, ParentappCategoryId = null, AppCategoryName = "ItemHostpital", ProtocolId =5165 , ProtocolTitle="ABC: section", },
    new AppCategoryDataModel() { AppCategoryId = 4845, ParentappCategoryId = null, AppCategoryName = "ItemHostpital", ProtocolId =5192 , ProtocolTitle="ABC: 3/31/20", },
    new AppCategoryDataModel() { AppCategoryId = 4846, ParentappCategoryId = null, AppCategoryName = "Contact information", ProtocolId = null, ProtocolTitle="", },
    new AppCategoryDataModel() { AppCategoryId = 4846, ParentappCategoryId = null, AppCategoryName = "Contact information", ProtocolId =5164 , ProtocolTitle="ABC: Evaluation", },
    new AppCategoryDataModel() { AppCategoryId = 4852, ParentappCategoryId = null, AppCategoryName = "UP", ProtocolId =null , ProtocolTitle="", },
    new AppCategoryDataModel() { AppCategoryId = 4852, ParentappCategoryId = null, AppCategoryName = "UP", ProtocolId = 5164, ProtocolTitle="ABC: Evaluation", },
    new AppCategoryDataModel() { AppCategoryId = 5023, ParentappCategoryId = null, AppCategoryName = "Call survival guide", ProtocolId = null, ProtocolTitle="" },
    new AppCategoryDataModel() { AppCategoryId = 5023, ParentappCategoryId = null, AppCategoryName = "Call survival guides", ProtocolId =5164 , ProtocolTitle="ABC: Evaluation" },
    new AppCategoryDataModel() { AppCategoryId = 5085, ParentappCategoryId = null, AppCategoryName = "OE", ProtocolId =null, ProtocolTitle="" },
    new AppCategoryDataModel() { AppCategoryId = 5085, ParentappCategoryId = null, AppCategoryName = "OE", ProtocolId =5164 , ProtocolTitle="ABC: Evaluation" },

   new AppCategoryDataModel() { AppCategoryId = 5099, ParentappCategoryId = null, AppCategoryName = "OEM", ProtocolId =null , ProtocolTitle=null },

    new AppCategoryDataModel() { AppCategoryId = 5334, ParentappCategoryId = 5085, AppCategoryName = "mmkk update", ProtocolId =null , ProtocolTitle= null },
    new AppCategoryDataModel() { AppCategoryId = 5336, ParentappCategoryId = 5085, AppCategoryName = "xdgdrg", ProtocolId =null , ProtocolTitle=null },
    new AppCategoryDataModel() { AppCategoryId = 5348, ParentappCategoryId = 5023, AppCategoryName = "test", ProtocolId =null , ProtocolTitle=null },
    new AppCategoryDataModel() { AppCategoryId = 5341, ParentappCategoryId = 5023, AppCategoryName = "New Category Level-1", ProtocolId =null , ProtocolTitle= null },

    new AppCategoryDataModel() { AppCategoryId = 5349, ParentappCategoryId = 5341, AppCategoryName = "New Category Level-2", ProtocolId =null , ProtocolTitle= null },

    new AppCategoryDataModel() { AppCategoryId = 5352, ParentappCategoryId = 5348, AppCategoryName = "New category3", ProtocolId =null , ProtocolTitle= null },



}.OrderBy(ap => ap.AppCategoryName);

AppCategoryDataModel

public class AppCategoryDataModel
{
    public int AppCategoryId { get; set; }
    public int? ParentappCategoryId { get; set; }
    public string AppCategoryName { get; set; }
    public int? ProtocolId { get; set; }
    public string ProtocolTitle { get; set; }
}

Dictionary<int, FirstLevelCategory> dictCategories = new Dictionary<int, FirstLevelCategory>();

foreach (AppCategoryDataModel category in appCategoryList)
{
    if (!dictCategories.ContainsKey(category.AppCategoryId))
    {
        dictCategories.Add(category.AppCategoryId, new FirstLevelCategory()
        {
            AppCategoryId = category.AppCategoryId,
            AppCategoryName = category.AppCategoryName,
            AppCategoryProtocolData = category.ProtocolId != null ?

            new List<ProtocolDetails>() {
                new ProtocolDetails()
                {
                    ProtocolId = (int)category.ProtocolId,
                    ProtocolTitle = category.ProtocolTitle
                }
            } : new List<ProtocolDetails>(),

            SubCategory = category.ParentappCategoryId != null
            ? GetSubCategoryList(appCategoryList, category.AppCategoryId)
            : new List<SecondLevelCategory>()
        });
    }
    else
    {
        if (category.ProtocolId != null)
            dictCategories[category.AppCategoryId].AppCategoryProtocolData.Add(new ProtocolDetails()
            {
                ProtocolId = (int)category.ProtocolId,
                ProtocolTitle = category.ProtocolTitle
            });
    }
}
foreach (var key in dictCategories.Keys.ToList())
{
    dictCategories[key].CategoryProtocolCount = dictCategories[key].AppCategoryProtocolData.Count();
}

一級類別

public class FirstLevelCategory
{
    public int AppCategoryId { get; set; }
    public string AppCategoryName { get; set; }
    public int CategoryProtocolCount { get; set; }
    public List<SecondLevelCategory> SubCategory { get; set; }
    public List<ProtocolDetails> AppCategoryProtocolData { get; set; }
}
public class ProtocolDetails
{
    public int ProtocolId { get; set; }
    public string ProtocolTitle { get; set; }
}

我的問題是ParentappCategoryId != null應該作為子類別出現的專案，但這也已添加到第一級類別中。我無法正確過濾。

我應該如何防止首先添加具有 ParentAppCategory 的專案。

預期結果：

   ItemResearch
        ABC: Evaluation
    ItemHostpital
        ABC: 3/28/20
        ABC: Evaluation
        ABC: section
        ABC: 3/31/20
    Contact information
        ABC: Evaluation
    UP
        ABC: Evaluation
    OE
        ABC: Evaluation
            mmkk update --subcategory
            xdgdrg      --subcategory
    Call survival guides
        ABC: Evaluation --details
            test  --subcategory
                New category3 --thirdcategory
            New Category Level-1 --subcategory
                New Category Level-2 -- thirdcategory

uj5u.com熱心網友回復：

我的問題是 ParentappCategoryId != null 應該作為子類別出現的專案，但這也已添加到第一級類別中。我無法正確過濾。

我將此解釋為我只想要ParentappCategoryId == null字典第一級中的專案。

如果是這種情況，應該可以通過過濾應用程式類別串列來解決，然后再遍歷它以將第一級專案添加到您的字典中。

以下是如何使用.Where()System.Linq 命名空間實作此目的的示例：

代替

foreach (AppCategoryDataModel category in appCategoryList)

和

//using System.Linq;

var firstLevelItems = appCategoryList.Where(app => app.ParentappCategoryId == null);

foreach (AppCategoryDataModel category in firstLevelItems)

注意：不需要單獨的變數；我主要考慮使用它來提高可讀性。

您不妨按如下方式實作它：

//using System.Linq;

foreach (AppCategoryDataModel category in appCategoryList.Where(app => app.ParentappCategoryId == null))

另外——我不確定這部分是否會給你帶來問題，但邏輯對我來說看起來很奇怪：

SubCategory = category.ParentappCategoryId != null
    ? GetSubCategoryList(appCategoryList, category.AppCategoryId)
    : new List<SecondLevelCategory>()

我將代碼解釋為：

僅當有父category物件時才填充SubCategory category

對我來說，鑒于您對第一級專案沒有父級的條件，這似乎意味著第一級專案都不應該有任何子類別。我覺得這很矛盾。如果我錯了，請糾正我。

如果我是對的，我建議實施GetSubCategoryList()，如果其中沒有任何專案appCategoryList具有ParentappCategoryId == category.AppCategoryId.

如果你有，你可以簡單地去

SubCategory = GetSubCategoryList(appCategoryList, category.AppCategoryId)

轉載請註明出處，本文鏈接：https://www.uj5u.com/caozuo/468067.html

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