你可以使用Contains查看它是否已经存在

You can use Contains to see if it's already there

listView1.Items.Contains

http://msdn.microsoft.com/en-us/library/system.windows.forms.listview.listviewitemcollection.contains.aspx [ ^ ]



和

http://www.c-sharpcorner.com/UploadFile/mgold/listviewduplicate05082007222909PM/listviewduplicate.aspx [ ^ ]

这是如何检查

如果ListViewEx1.Items.ToString.Contains（ss）= True那么

MsgBox（是）

否则

MsgBox（否）

结束如果

this is how to check
If ListViewEx1.Items.ToString.Contains("ss") = True Then
MsgBox("yes")
Else
MsgBox("no")
End If

if(listviewDATA.FindItemWithText(txtName.Text) != null)
{
   MessageBox.Show("Found!");
}
else
{
   MessageBox.Show("Data doesn't Exist");
}