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在我的程序中，我需要添加一個插入類別的函數。我正在使用treeView來顯示數據。如何爲記錄數據庫創建添加功能？
How can I model this class in a database?
用戶插入的水平，並且程序必須插入該級別類別。但我很累。因爲它需要檢查其他級別是否存在（IE：treeView是空的，我想添加2.1，所以這是一個錯誤）。
有時，您可能會添加一個已設置的級別，因此必須禁止。
我在代碼中需要一點幫助。它已完成，但我想改進它或修正錯誤（如果是這樣）。
下面是代碼：
private void AddButton_Click(object sender, RoutedEventArgs e)
{
NorthwindDataContext cd = new NorthwindDataContext();
int[] levels = LevelTextBox.Text.ToIntArray('.');
string newName = NameTextBox.Text;
int[] parentLevels = new int[levels.Length - 1];
Array.Copy(levels, parentLevels, parentLevels.Length);
Objective current = GetNode(levels);
Objective parent = GetNode(parentLevels);
if (current != null)
{
MessageBox.Show("Level already exists");
return;
}
else if (parent == null && parentLevels.Length != 0)
{
MessageBox.Show("Parent level doesn't exist");
return;
}
var newObjective = new Objective();
newObjective.Name = newName;
newObjective.Level = levels.Last();
newObjective.Parent_ObjectiveID = parent == null ? null : (int?)parent.ObjectiveID;
cd.Objective.InsertOnSubmit(newObjective);
cd.SubmitChanges();
MessageBox.Show("The new objective has added successfully");
NameTextBox.Clear();
LoadObjectives();
}
public Objective GetNode(params int[] indexes)
{
return GetNode(null, 0, indexes);
}
public Objective GetNode(int? parentid, int level, params int[] indexes)
{
NorthwindDataContext cd = new NorthwindDataContext();
Objective item = null;
if (indexes.Length == 0)
return null;
if (parentid == null)
{
item = (from p in cd.Objective
where p.Level == indexes[level] && p.Parent_ObjectiveID == null
select p).SingleOrDefault();
}
else
{
item = (from p in cd.Objective
where p.Level == indexes[level] && p.Parent_ObjectiveID == parentid
select p).SingleOrDefault();
}
if (item == null)
return null;
if (++level < indexes.Length)
item = GetNode(item.ObjectiveID, level, indexes);
return item;
}