如何使用 C# 获取选中列表框中新选中项目的文本

Question

我正在使用 ItemCheckEventArgs，从中可以获取索引值，但从该值我不确定如何查找已检查内容的文本内容。

Answer 1

在 ItemCheck 事件处理程序中使用 ItemCheckEventArgs e 您可以检索相应的对象

checkedListBox1.Items[e.Index]

Answer 2

这里有一些简单的代码可以解决这个问题：

public void CheckedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
{
    var checkedListBox = (CheckedListBox)sender;
    var checkedItemText = checkedListBox.Items[e.Index].ToString();
}

Answer 3

CheckedListBox类有一个 CheckedItems 属性。

private void WhatIsChecked_Click(object sender, System.EventArgs e) {
    // Display in a message box all the items that are checked.

   // First show the index and check state of all selected items.
   foreach(int indexChecked in checkedListBox1.CheckedIndices) {
       // The indexChecked variable contains the index of the item.
       MessageBox.Show("Index#: " + indexChecked.ToString() + ", is checked. Checked state is:" + checkedListBox1.GetItemCheckState(indexChecked).ToString() + ".");
   }

    // Next show the object title and check state for each item selected.
    foreach(object itemChecked in checkedListBox1.CheckedItems) {

        // Use the IndexOf method to get the index of an item.
        MessageBox.Show("Item with title: \"" + itemChecked.ToString() + 
            "\", is checked. Checked state is: " + checkedListBox1.GetItemCheckState(checkedListBox1.Items.IndexOf(itemChecked)).ToString() + ".");
    }

}

Answer 4

在 SelectedIndexChanged 事件中，输入以下代码

string text = (sender as CheckedListBox).SelectedItem.ToString();