我有一个带有元素的ListBox，我需要显示元素，我有这个工作，但我想添加一个选项来删除所选项目，这是问题...我删除它但我正在删除listbox不是来自元素类，我该怎么做才能从树中删除项目？这是我的代码：
表格1：
index_arr这是我的大会班：
namespace EraseJunkFiles
{
class Program
{
static void Main(string[] args)
{
DirectoryInfo yourRootDir = new DirectoryInfo(@"C:\somedirectory\");
foreach (DirectoryInfo dir in yourRootDir.GetDirectories())
DeleteDirectory(dir.FullName, true);
}
public static void DeleteDirectory(string directoryName, bool checkDirectiryExist)
{
if (Directory.Exists(directoryName))
Directory.Delete(directoryName, true);
else if (checkDirectiryExist)
throw new SystemException("Directory you want to delete is not exist");
}
}
}
我认为这段代码已经足够了，所有其他代码就像其他Composite Desing模式代码一样，现在，我该怎样做才能删除项目功能？从我的列表框中选择private void btnBuildPartsList_Click(object sender, EventArgs e)
{
Assembly topWidget = new Assembly("Main Assembly", 1);
Assembly chassis = new Assembly("Chassis", 1);
Assembly display = new Assembly("Display", 1);
Assembly powerSupply = new Assembly("Power Supply", 1);
Part bolt = new Part("Bolt", 24);
Part mainCase = new Part("Case", 1);
Part screen = new Part("Screen", 3);
Part displayElectronics = new Part("Display Electronics", 3);
Part transformer = new Part("Transformer", 1);
Part powerBoard = new Part("Power Board", 1);
Part ductTape = new Part("Duct Tape", 5);
Part gum = new Part("Bubble Gum", 25);
topWidget.Add(chassis);
topWidget.Add(display);
topWidget.Add(powerSupply);
chassis.Add(mainCase);
chassis.Add(bolt);
display.Add(screen);
display.Add(displayElectronics);
powerSupply.Add(transformer);
powerSupply.Add(powerBoard);
topWidget.Add(ductTape);
topWidget.Add(gum);
DisplayPartsList(topWidget);
}
private void DisplayPartsList(Assembly topWidget)
{
List<string> partsList = new List<string>();
topWidget.WritePartsList(partsList);
listParts.Items.Clear();
listParts.Items.AddRange(partsList.ToArray());
}
元素。就像我之前说的那样，我从namespace Composite
{
public class Assembly : BaseAssembly
{
private List<BaseAssembly> elements = new List<BaseAssembly>();
public Assembly(string name, int quantity)
: base(name, quantity)
{
}
public override void Add(BaseAssembly assembly)
{
elements.Add(assembly);
}
public override void Remove(BaseAssembly assembly)
{
elements.Remove(assembly);
}
public override void WritePartsList(List<string> list)
{
list.Add(Quantity.ToString() + " - " + Name);
foreach (BaseAssembly assembly in elements)
{
assembly.WritePartsList(list);
}
}
}
}
删除了该项目，但是我想将它从所有类中删除。提前致谢。
答案 0 :(得分：1)
我有一个解决方案，首先将此代码作为全局变量：
Assembly topWidget = new Assembly("Main Assembly", 1);
Assembly chassis = new Assembly("Chassis", 1);
Assembly display = new Assembly("Display", 1);
Assembly powerSupply = new Assembly("Power Supply", 1);
Part bolt = new Part("Bolt", 24);
Part mainCase = new Part("Case", 1);
Part screen = new Part("Screen", 3);
Part displayElectronics = new Part("Display Electronics", 3);
Part transformer = new Part("Transformer", 1);
Part powerBoard = new Part("Power Board", 1);
Part ductTape = new Part("Duct Tape", 5);
Part gum = new Part("Bubble Gum", 25);
之后你需要处理delete函数如何做到这一点？使用按钮或仅从列表框中选择元素？这取决于你，我会给你代码，然后你只需改变你需要的东西。
您的元素具有以下结构：
一个
A，B
A，B，C
在这种情况下，A topWidget B为chassis, display, powerSupply，C为mainCase, bolt, screen, displayElectronics... etc，您可以选择要删除的内容，换句话说，如果删除{{1}您将删除所有B element，因此您需要选择是否只删除C elements too或全部C element，您可以使用B elements执行此操作，你需要发送什么？ switch但是，您的ListBox包含以下内容：The selected item from the ListBox对吗？然后你只需要进行拆分以获得24 - Bolt或其他任何内容。
Bolt有了这个，你将得到你添加的相同字符串，你只需要处理var select = listParts.SelectedItem.ToString().IndexOf('-');
string selectVal = listParts.SelectedItem.ToString().Substring(select + 1).Trim();
并使用switch函数，如下所示：
Remove或者您可以执行此操作以删除switch (selectVal)
{
//This will remove all the elements of powerSupply (transformer, powerBoard )
case "Power Supply":
topWidget.Remove(powerSupply);
break;
}
C element one by one请记住，在切换后，您需要刷新ListBox switch (selectVal)
{
//This will remove only "Transformer".
case "Transformer":
powerSupply.Remove(transformer);
break;
}
你可以毫无问题地结合这两种情况，我希望这对你有帮助。