c# - How to make event: when definite tabpage in tabcontrol is chosen - treeview control become disable?

Question

像这样的东西：

private void secondTabPageInTabControl_Click(object sender, System.EventArgs e)
        {
           this.myTreeView.Enable = false; 
        } //then I chose other tabpages and it becomes enable

Answer 1

请改用 TabControl 的 SelectedIndexChanged 事件。它会告诉您何时选择了新选项卡。使用与此类似的代码：

    private void tabControl1_SelectedIndexChanged(object sender, EventArgs e) {
        this.myTreeView.Enable = tabControl1.SelectedTab != tabPage2;
    }

或按索引，可读性较差：

    private void tabControl1_SelectedIndexChanged(object sender, EventArgs e) {
        this.myTreeView.Enable = tabControl1.SelectedIndex != 1;
    }

Answer 2

另一种解决方案，但请注意，如果您使用太多标签页，这可能会变得臃肿：

    private void tabControl1_Selecting(object sender, TabControlCancelEventArgs e)
    {
        UpdateUI(e.TabPageIndex);    
    }

    public void UpdateUI(int index)
    {
        switch (index)
        { 
            case 0:
                treeView1.Enabled = true;
                break;
            case 1:
                treeView1.Enabled = false;
                break;
            case 2:
                treeView1.Enabled = false;
                break;
            default:
                treeView1.Enabled = false;
                break;
        }
    }