this.listBox1.Items.Clear();这句话是什么意思?

this.listBox1.Items.Clear();这句话是什么意思? listbox1.items(listbox1.selectedindex) 和 listbox1.items.add(listbox1.selectedindex) 加ADD和不加ADD的区别 烦请解释一下这句话的意思 For a = 0 To ListBox1.Items.Count - Dim i As Integer Dim x As Integer For i = 0 To ListBox1.Items.Count - x = x + CInt(ListBox1.Next MessageBox.Show((x /ListBox1.Items.Count.帮忙解释下这几句话的意思 为什么ListBox1.SelectedIndex的值等于-1protected void btnDeleteType_Click(object sender, EventArgs e) { if (this.lstCardType.SelectedIndex != -1) { string typeId = this.lstCardType.SelectedItem.Value; bool C# 中 listBox1.SelectedIndex!= CHECK OFF This items have been checked off. for(Product product:this.items)是什么意思,编译通过了 can you seand to me pris this items and min order also your web sit and other items 怎么翻译? Here is the Nine O'clock News.Today there are four items on this program. this page contains both secure and ninsecure items. do you want to display t items是什么意思 “all items of this addendum form part of,and are subject to,the tender documents conditions”翻 英语翻译After listing the demand items,proper weights should be given to the demand items by decision makers.This article uses the Borda count to count the demand weights.Comprehensively considering the opinions of decision makers can make them t help sos 翻译We acknowledge your claim for compensation for the low quality items and ask you to excuse this error. We are prepared to allow you a ..% discount for the low quality items. items什么意思 软件中的items是什么意思? functional items是什么意思, items文件夹是什么意思