C# ListView SelectedIndices and SelectedItems Count Issue
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25-02-2021 - |
Domanda
Having some trouble with these methods on C# 2010 express with a new winform project both data types have the method count, which seems to be documented on MSDN, however I can not seem to get them to work. The listview control itself seems fine when compiling.
listView2.SelectedItems.Count();
Error 1 'System.Windows.Forms.ListView.SelectedListViewItemCollection' does not contain a definition for 'Count' and no extension method 'Count' accepting a first argument of type 'System.Windows.Forms.ListView.SelectedListViewItemCollection' could be found (are you missing a using directive or an assembly reference?)
listView2.SelectedIndices.Count();
Error 1 'System.Windows.Forms.ListView.SelectedIndexCollection' does not contain a definition for 'Count' and no extension method 'Count' accepting a first argument of type 'System.Windows.Forms.ListView.SelectedIndexCollection' could be found (are you missing a using directive or an assembly reference?)
Both data types seem to be defined. Also cannot use indices.
listView2.SelectedItems[0]
Soluzione
They are properties, not methods:
http://msdn.microsoft.com/en-us/library/system.windows.forms.listview.selectedindexcollection.aspx
Remove the brackets:
var count = listView2.SelectedItems.Count;
count = listView2.SelectedIndices.Count;
You can use index notation on them. The SelectedItems
property exposes a string
and int
index. The SelectedIndices
property only exposes an int
index.
Altri suggerimenti
You're issuing the call as if it were a method. You're just trying to access the Count property of the list. Remove the () at the end of your Count call.