C# 我想在列表中添加一个对象，但嵌套循环的组织方式使这不可能（C）

所以我正在制作一个程序，它有几个类别，其中存储了多个注释。我是一名学生，我们被指派与SQLServer的localdb一起保存我们的类别和注释。程序使用treeview控件显示类别和注释

现在我正试图为我的笔记制作一个搜索栏。它必须根据注释的标题进行过滤

我的问题是，如何从一个类别中获取所有注释并将它们添加到同一个类别中？现在，所有注释都以不同类别显示，但名称相同。这是因为我的主循环处理注释，而内循环处理类别

当我放置categoriesUI1.Categories.Addcategory时；在while循环后面，我只看到一个类别和一个注释，因为注释的while循环首先被处理

以下是一些额外的屏幕截图，让您更好地了解我的程序的工作原理：

筛选前：

在“test2”上进行筛选后：

我给了你我的idae

1.你通过搜索键获得所有美食。 2.获取并添加通过searchKey和Cat_id归档的所有注释，并将其添加到适当的类别中

细节如下，只是一些想法，尚未测试。希望能有所帮助

    /// <summary>
    /// initail your  UI
    /// </summary>
    void ini()
    {


        connection = new SqlConnection(@"Data Source=(localdb)\mssqllocaldb;Initial Catalog=dbNotes;Integrated Security=True;MultipleActiveResultSets=true");
        categoriesUI1.tvwCategories.SelectedNode = categoriesUI1.tvwCategories.TopNode;
        int count = categoriesUI1.Categories.Count;

        if (count > 0)
        {
            for (int i = count; i > 0; i = count)
            {
                categoriesUI1.Categories.RemoveAt(0);
                count = categoriesUI1.Categories.Count;
            }
        }

    }







    /// <summary>
    /// this is for add all searchressult Cates to to Treeview
    /// </summary>
    /// <param name="sKey"></param>
    void SearchCate(string sKey)
    {
           connection.Open();
        SqlCommand commandCategory = new SqlCommand("SELECT Titel FROM tblCategory WHERE ID in ( 
SELECT ID  FROM tblNote WHERE Titel LIKE '%" + sKey +
                                "%') " + Cat_id, connection);


        SqlDataReader readerCategory = commandCategory.ExecuteReader();
        if (readerCategory.HasRows)
        {
            while (readerCategory.Read())
            {
                Cat_title = readerCategory.GetString(0);
                category = new Category(Cat_id, Cat_title); // new category
                categoriesUI1.Categories.Add(category);

                // then add your note's search result here to eavcgorhe

                AddNoteToACateBySearchKey(sKey,category);

            }
        }



    }



    /// <summary>
    /// add all searchresult note to cate 
    /// </summary>
    /// <param name="sKey"></param>
    /// <param name="Parent"></param>

    void AddNoteToACateBySearchKey(string sKey, Category Parent )
    {


        connection.Open();
        SqlCommand commandNote = new SqlCommand("SELECT ID, Cat_ID, Titel, Text, Created FROM tblNote WHERE Titel LIKE '%" + sKey + "%' and Cat_ID='" + Parent.Cat_id + "' ", connection);
        SqlDataReader readerNote = commandNote.ExecuteReader();
        if (readerNote.HasRows)
        {
            Category category = new Category();
            while (readerNote.Read())
            {
                int id = readerNote.GetInt32(0);
                int Cat_id = readerNote.GetInt32(1);
                string title = readerNote.GetString(2);
                string text = readerNote.GetString(3);
                DateTime created = readerNote.GetDateTime(4);
                string Cat_title = "";



                Note note;
                note = new Note(id, title, text, created); // new note
                category.Notes.Add(note);
                readerCategory.Close();




            }



        }

        readerNote.Close();
        connection.Close();

    }

---

我修复了这个问题，只在Cat_ID与当前类别的ID对应时添加了一个注释。现在，主循环处理类别，内循环处理注释

connection = new SqlConnection(@"Data Source=(localdb)\mssqllocaldb;Initial Catalog=dbNotes;Integrated Security=True;MultipleActiveResultSets=true");
        categoriesUI1.tvwCategories.SelectedNode = categoriesUI1.tvwCategories.TopNode;
        int count = categoriesUI1.Categories.Count;

        if (count > 0)
        {
            for (int i = count; i > 0; i = count)
            {
                categoriesUI1.Categories.RemoveAt(0);
                count = categoriesUI1.Categories.Count;
            }
        }

        connection.Open();
        SqlCommand commandCategory = new SqlCommand("SELECT ID, Titel from tblCategory", connection);
        SqlDataReader readerCategory = commandCategory.ExecuteReader();
        if (readerCategory.HasRows)
        {
            while (readerCategory.Read())
            {
                int id = readerCategory.GetInt32(0);
                string titel = readerCategory.GetString(1);
                Category category = new Category(id, titel);

                SqlCommand commandNote = new SqlCommand("SELECT ID, Cat_ID, Titel, Text, Created FROM tblNote WHERE Titel LIKE '%" + searchBarUI1.getTextValue() + "%'", connection);
                SqlDataReader readerNote = commandNote.ExecuteReader();
                if (readerNote.HasRows)
                {
                    while (readerNote.Read())
                    {
                        int catID = readerNote.GetInt32(1);
                        if (catID == id)
                        {
                            int noteID = readerNote.GetInt32(0);
                            string noteTitel = readerNote.GetString(2);
                            string noteText = readerNote.GetString(3);
                            DateTime noteCreated = readerNote.GetDateTime(4);
                            Note note = new Note(noteID, noteTitel, noteText, noteCreated);
                            category.Notes.Add(note);
                        }
                    }
                }
                if(category.Notes.Count > 0)
                    categoriesUI1.Categories.Add(category);
            }
        }

connection = new SqlConnection(@"Data Source=(localdb)\mssqllocaldb;Initial Catalog=dbNotes;Integrated Security=True;MultipleActiveResultSets=true");
        categoriesUI1.tvwCategories.SelectedNode = categoriesUI1.tvwCategories.TopNode;
        int count = categoriesUI1.Categories.Count;

        if (count > 0)
        {
            for (int i = count; i > 0; i = count)
            {
                categoriesUI1.Categories.RemoveAt(0);
                count = categoriesUI1.Categories.Count;
            }
        }

        connection.Open();
        SqlCommand commandCategory = new SqlCommand("SELECT ID, Titel from tblCategory", connection);
        SqlDataReader readerCategory = commandCategory.ExecuteReader();
        if (readerCategory.HasRows)
        {
            while (readerCategory.Read())
            {
                int id = readerCategory.GetInt32(0);
                string titel = readerCategory.GetString(1);
                Category category = new Category(id, titel);

                SqlCommand commandNote = new SqlCommand("SELECT ID, Cat_ID, Titel, Text, Created FROM tblNote WHERE Titel LIKE '%" + searchBarUI1.getTextValue() + "%'", connection);
                SqlDataReader readerNote = commandNote.ExecuteReader();
                if (readerNote.HasRows)
                {
                    while (readerNote.Read())
                    {
                        int catID = readerNote.GetInt32(1);
                        if (catID == id)
                        {
                            int noteID = readerNote.GetInt32(0);
                            string noteTitel = readerNote.GetString(2);
                            string noteText = readerNote.GetString(3);
                            DateTime noteCreated = readerNote.GetDateTime(4);
                            Note note = new Note(noteID, noteTitel, noteText, noteCreated);
                            category.Notes.Add(note);
                        }
                    }
                }
                if(category.Notes.Count > 0)
                    categoriesUI1.Categories.Add(category);
            }
        }