我有一個ListBox
包含項目,我從ComboBox
中選擇。當我從我的ComboBox
中選擇一個項目時,它也會刪除我的ComboBox
中的該項目。避免重複列表項目
我的表單上有一個按鈕,讓我複製我的ListBox
中的選定項目,給我兩個ListBox
中的相同項目。
我的表單上也有一個按鈕,讓我從我的ListBox
中刪除選定的項目。如果我從ListBox
中刪除了一件物品,該物品將返回至ComboBox
,但是如果我複製了該物品並從ListBox
中刪除了這兩個物品,則它們都會顯示在ComboBox
中。
我不希望它是可能有兩個相同的項目在ComboBox
這是我曾嘗試使用代碼:
private void buttonRemove_Click(object sender, EventArgs e)
{
try
{
if (ComboBox.ToString().Contains("Chicken McNuggets"))
{
found = true;
}
if (!found)
{
ComboBox.Items.Add("Chicken McNuggets");
found = false;
}
ListBox.Items.Remove(ListBox.SelectedItem);
}
catch
{
MessageBox.Show(// Message);
}
}
這是我第一次在這裏問一個問題。
編輯:
private void buttonRemove_Click(object sender, EventArgs e)
{
try
{
if ((String)listBox.SelectedItem == "Big Mac" || (String)listBox.SelectedItem == "Quarter Pounder" || (String)listBox.SelectedItem == "McFeast" || (String)listBox.SelectedItem == "Cheeseburger" || (String)listBox.SelectedItem == "Hamburger" || (String)listBox.SelectedItem == "Big Tasty Bacon" || (String)listBox.SelectedItem == "McChicken" || (String)listBox.SelectedItem == "Fillet-O-Fish" || (String)listBox.SelectedItem == "Chicken Nuggets")
{
comboBox.Items.Add(listBox.SelectedItem);
listBox.Items.Remove(listBox.SelectedItem);
}
else if ((String)listBox.SelectedItem == "BBQ dip" || (String)listBox.SelectedItem == "Cheddar dip" || (String)listBox.SelectedItem == "Gulerod" || (String)listBox.SelectedItem == "Hvidløgs dip" || (String)listBox.SelectedItem == "Karry dip" || (String)listBox.SelectedItem == "Ketchup" || (String)listBox.SelectedItem == "Pommes Frites Sauce" || (String)listBox.SelectedItem == "Sennep dip" || (String)listBox.SelectedItem == "Sursød dip" || (String)listBox.SelectedItem == "Æbler")
{
comboBox2.Items.Add(listBox.SelectedItem);
listBox.Items.Remove(listBox.SelectedItem);
}
else if ((String)listBox.SelectedItem == "Gulerodskage" || (String)listBox.SelectedItem == "Kanelsnegl" || (String)listBox.SelectedItem == "McDonut chokolade" || (String)listBox.SelectedItem == "Sundae m. chokoladesauce" || (String)listBox.SelectedItem == "McDonut sukkerovertræk" || (String)listBox.SelectedItem == "McFlurry Daim" || (String)listBox.SelectedItem == "McFlurry Smarties" || (String)listBox.SelectedItem == "Sundae m. jordbærdsauce" || (String)listBox.SelectedItem == "Sundae m. karamelsauce" || (String)listBox.SelectedItem == "Triple chokolade muffin" || (String)listBox.SelectedItem == "Vaffelis")
{
comboBox3.Items.Add(listBox.SelectedItem);
listBox.Items.Remove(listBox.SelectedItem);
}
else if (listBox.SelectedItem.ToString().Contains("Stor") || listBox.SelectedItem.ToString().Contains("Mellem") || listBox.SelectedItem.ToString().Contains("Lille") || listBox.SelectedItem.ToString().Contains("9") || listBox.SelectedItem.ToString().Contains("6") || listBox.SelectedItem.ToString().Contains("4"))
{
string objectToString = listBox.SelectedItem.ToString();
string[] ord = objektToString.Split(' ');
string selectedItem = listBox.SelectedItem;
var check = comboBox.Items.Cast<string>()
.ToList()
.FirstOrDefault(c => c.Contains(selectedItem));
if (check != null)
{
comboBox.Items.Add("Chicken McNuggets");
}
else
{
listBox.Items.Remove(selectedItem);
}
if (listBox.SelectedItem.ToString().Contains("Pommes Frites"))
comboBox2.Items.Add(ord[1] + " " + ord[2]);
else if (listBox.SelectedItem.ToString().Equals("Stor Coca-Cola") || listBox.SelectedItem.ToString().Equals("Mellem Coca-Cola") || listBox.SelectedItem.ToString().Equals("Lille Coca-Cola"))
comboBox4.Items.Add(ord[1]);
else if (listBox.SelectedItem.ToString().Contains("Milkshake"))
comboBox4.Items.Add(ord[1] + " " + ord[2] + " " + ord[3]);
else
comboBox4.Items.Add(ord[1] + " " + ord[2]);
listBox.Items.Remove(listBox.SelectedItem);
}
}
catch
{
MessageBox.Show(// Message);
}
}
只需添加'的ToString()''來糾正錯誤,字符串將selectedItem = listBox.SelectedItem.ToString();' – spajce
我想這一點,但現在不會添加 「雞McNugguts」 來我的組合框。 –
它應該喜歡我的最終答案。請嘗試。 – spajce