[英]How to disable check/uncheck of an item in a checkedlistbox in c#
我有一個包含 10 個項目的 CheckedListBox。 在每個項目檢查一個方法被調用。 我想禁用正在執行該方法的特定項目的復選框,以便用戶在作業完成之前無法取消選中該項目。
** 取消選中一個項目會調用另一個方法。
這是ItemCheck事件的代碼
private void host_listbox_ItemCheck(object sender, ItemCheckEventArgs e)
{
int index = e.Index;
try
{
string sitem = host_listbox.Items[index].ToString();
host_list[sitem].checked_event=e;
if (!host_list[sitem].is_busy)
{
host_config.listEnabled = false;
host_list[sitem].con_worker.RunWorkerAsync();
}
if (host_listbox.GetItemCheckState(index) == CheckState.Checked)
{
host_list[sitem].connected = false;
}
}
catch(Exception ex)
{
output_textbox.AppendText("connection failed..............." +ex.ToString() +Environment.NewLine);
}
}
您可以使用以下代碼檢查/取消選中checkedListBox中的項目
checkedListBox.SetItemChecked(item, true);
有關更多信息,請轉到Microsoft文檔。
private void host_listbox_ItemCheck(object sender, ItemCheckEventArgs e)
{
int index = e.Index;
try
{
string sitem = host_listbox.Items[index].ToString();
if (host_list[sitem].is_busy // or whatever indicates that background worker is running or any condition that specifies, that you do not want to let this item to be changed)
e.NewValue = e.CurrentValue; //Change the value back
else
{
//Let the checked state of the item change
如果相關的后台工作正在運行,則此代碼可防止檢查狀態更改:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
workerList = new List<BackgroundWorker>();
for (int i = 0; i < 10; i++)
{
var el = new BackgroundWorker();
el.DoWork += (s, e) =>
{
Thread.Sleep(5000);
};
workerList.Add(el);
checkedListBox1.Items.Add("el " + i);
}
}
private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
{
var worker = workerList[e.Index];
if (worker.IsBusy)
{
e.NewValue = e.CurrentValue;
return;
}
if (e.NewValue == CheckState.Checked)
worker.RunWorkerAsync();
}
public List<BackgroundWorker> workerList { get; set; }
}
想想,只有funcion解決方案設置了選擇模式
CheckedListBox.SelectionMode = SelectionMode.None;
private void ItemCheck(object sender, ItemCheckEventArgs e)
{
if (busy)
e.NewValue = e.CurrentValue;
}
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