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

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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
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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
为什么ListBox1.SelectedIndex的值等于-1

protected void btnDeleteType_Click(object sender, EventArgs e)

    {

        if (this.lstCardType.SelectedIndex != -1)

        {

            string typeId = this.lstCardType.SelectedItem.Value;

            bool deleteCardtype = CardManager.DeleteCardTypeByCardTypeId(typeId);

            if (deleteCardtype)

            {

                DispalyCardPrice();

            }

        }

        else

        {

            Page.ClientScript.RegisterStartupScript(this.GetType(), "OK", "<script>alert('删除失败!');</script>");

        }

    }

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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
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C# 中 listBox1.SelectedIndex!= 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 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 this.listBox1.Items.Clear();这句话是什么意思? Stitch Selected selected 意思 They selected Tom,____ they liked ,as captain .为什么要用whom printer selected is not selected countries是什么意思 selected什么意思 randomly selected是什么意思 No items were selected! No map selected是什么意思 kill selected apps wrong file selected是什么意思 scientifically selected employees是什么意思 No objects selected是什么意思 No files selected.