如何知道是否在列表视图中选择了一个项目 [英] how to know if an item in the Listview is selected

问题描述

大家好，
如果列表视图中的某个项目被选中，则要知道是否选择了任何项目..
我尝试使用listview1.SelectedItems.Count和listview1.SelectedIndices.Count，但是每次选择一个项目后，它都将count设为0 ...

thnx，

hi all ,
if an item in the listview is seleced then to know if any item is selected ..
I tried using listview1.SelectedItems.Count and listview1.SelectedIndices.Count but everytime it is giving count to 0 after selecting an item ...

thnx ,

推荐答案

您可以执行以下操作:

You can do something like this:

foreach listview itm yourListView.Items)
{
   if(itm.selected)
   {
    Add in a string, its id or name or whatever
   }
}

受保护的void ListBox1_SelectedIndexChanged(object sender，EventArgs e)
{
foreach(ListBox1.Items中的ListItem li)
{
如果(li.Selected)
{
Label1.Text = li.Text.ToString();
}
}
}

label1将显示选定的项目

protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
foreach (ListItem li in ListBox1.Items)
{
if (li.Selected)
{
Label1.Text = li.Text.ToString();
}
}
}

label1 will display the selected item

假设ListBox选择模式为MultiSimple或MultiExtended:否则，当然没有意义:)

定义一个新的SelectedObjectCollection，然后在您的表单加载事件中将其初始化:

Assume the ListBox selection mode is MultiSimple or MultiExtended: otherwise, of course, this makes no sense :)

Define a new SelectedObjectCollection, then initialize it in your Form Load Event:

private ListBox.SelectedObjectCollection ListBoxSelections;

private void Form1_Load(object sender, EventArgs e)
{
    // initialize it here because prior to Form Load
    // a reference to the instance of listBox1 does
    // not exist to pass as a parameter

    // why initialize it ?
    // so we don't have to check if it's == null
    // when no items are selected and we want to
    // do something like access the 'Count property
    ListBoxSelections = new ListBox.SelectedObjectCollection(listBox1);
}

然后将"SelectedIndexChanged"事件连接"到您的ListBox:

Then, ''wire-up'' the SelectedIndexChanged Event to your ListBox:

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    ListBoxSelections = listBox1.SelectedItems;
}

现在，任何时候您需要对ListBox中的选定项目执行任何操作时，都可以使用''ListBoxSelections:如果其''Count属性==#0，则表明当前没有选定的项目.

And now any time you need to do whatever with the selected items in the ListBox, you can just use ''ListBoxSelections: if its ''Count property == #0, you know there are no current items selected.

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