how to see if Listview column contains a specific name

Question

User-1016473172 posted

I have created a  ListView with multiple columns

(This is a part of the Xaml)

<ListView.View>
				<GridView>
					<GridViewColumn Width="100" Header="Indexer" DisplayMemberBinding="{Binding Number}"/>
					<GridViewColumn Width="100" Header="Name" DisplayMemberBinding="{Binding NameId}"/>
					<GridViewColumn Width="100" Header="Age" DisplayMemberBinding="{Binding Age}"/>
				</GridView>
			</ListView.View>

cs part

public class MyItem
		{
			public int Number { get; set; }
			public int Age { get; set; }
			public string NameId { get; set; }
		}

i know how to add a new item to a specific column

AccountList.Items.Add(new MyItem { Age = Convert.ToInt32(AgeVAlue), NameId = NameValue.ToString(), Number = ListCount });

how do i check if NameId contains a spefic word because i cannot do this:

AccountList.Items.Contains(SpecificWord)

Answer 1

User-1716253493 posted

if(!AccountList.Items.Contains(NameValue.ToString()))
{
  AccountList.Items.Add(new MyItem { Age = Convert.ToInt32(AgeVAlue), NameId = NameValue.ToString(), Number = ListCount });
}

Answer 2

User-1016473172 posted

it still does not seem to work

i have created a checkbox named "Namecheckbox"

if its not checked it should not allow duplicate names. 

string NameValue = "jacke";

			if (NameCheckbox.IsChecked == false && AccountList.Items.Contains(NameValue.ToString()) )
			{
				MessageBox.Show("this name is already in use");
			}
			else if (NameCheckbox.IsChecked == true)
			{
				MessageBox.Show("ok");
			}
			else
			{
				MessageBox.Show("something went wrong");
			}

when i have added the name "jacke" to the list and i use the above code it does not warn me with the text "this name is already in use"

or when i just use this:

if (AccountList.Items.Contains(NameValue.ToString()))
			{
				MessageBox.Show("already used");
			}

after i put the word jacke in the list and i use this code (as a button )   nothing is showing

Answer 3

User-939850651 posted

Hi arclite860,

According to your description, have you tried something like this?

public MainWindow()
        {
            InitializeComponent();
            List<MyItem> items = new List<MyItem>();
            items.Add(new MyItem() { NameId = "John Doe", Age = 42, Number = 1 });
            items.Add(new MyItem() { NameId = "Jane Doe", Age = 39, Number = 2 });
            items.Add(new MyItem() { NameId = "Sammy Doe", Age = 13, Number = 3 });
            listView.ItemsSource = items;

            string NameValue = "Jane Doe";
            bool used = false;
            foreach (var item in listView.Items) {
                if (((MyItem)item).NameId == NameValue)
                    used = true;
            }

            MessageBox.Show(used?"Name existed":"not exist");
        }

        public class MyItem
        {
            public int Number { get; set; }
            public int Age { get; set; }
            public string NameId { get; set; }
        }

        private void listView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {

        }

Result:

Best regards,

Xudong Peng