选中新选项卡时清除列表框

Question

我试图在选择新标签时清除列表框的内容。这就是我得到的，但没有任何反应。

 private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (tabControl1.SelectedTab == tabControl1.TabPages["entryTab"])
        {
            readBox.Items.Clear();
            reminderBox.Items.Clear();
        }
    }

Answer 1

在表单加载

中尝试这样的操作

   tabControl1.Selecting += new TabControlCancelEventHandler(tabControl1_SelectedIndexChanged);

Answer 2

// Try this set null to DataSource 

private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (tabControl1.SelectedTab == tabControl1.TabPages["entryTab"])
        {
            readBox.DataSource = null;
            reminderBox.DataSource  = null;
        }
    }