如何防止重复项目listView C#

How prevent duplicate items listView C#(如何防止重复项目listView C#)

问题描述

我正在使用 Windows 窗体.使用此代码，我将项目从 comboBox 添加到 listView.

I am using Windows Forms. With this code I add items to listView from comboBox.

ListViewItem lvi = new ListViewItem();
lvi.Text = comboBox1.Text;
lvi.SubItems.Add("");
lvi.SubItems.Add("");
lvi.SubItems.Add("");
lvi.SubItems.Add("")

if (!listView1.Items.Contains(lvi))
{
    listView1.Items.Add(lvi);
}

我需要防止重复项但不起作用，我该如何解决?

I need prevent duplicate items but not work, How Can I solve this?

推荐答案

你应该使用 ContainsKey(string key) 而不是 Contains(ListViewItem item)

You should be using ContainsKey(string key) instead of Contains(ListViewItem item)

var txt = comboBox1.Text;

if (!listView1.Items.ContainsKey(txt))
{
    lvi.Text = txt;

    // this is the key that ContainsKey uses. you might want to use the value 
    // of the ComboBox or something else, depending the combobox is freetext 
    // or regarding your scenario.
    lvi.Name = txt;

    lvi.SubItems.Add("");
    lvi.SubItems.Add("");
    lvi.SubItems.Add("");
    lvi.SubItems.Add("");

    listView1.Items.Add(lvi);
}

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