我想自动打开Drop Down。 | 我想自动打开

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问题描述

我有两个下拉列表。

当我在第一个下拉列表中选择任何值之后，我想自动打开第二个下拉列表是否有解决方案。

I have two dropdown.
When i select Any value in First dropdown after that i want to open second dropdown automatically is there in solution for that.

推荐答案

 <combobox name="comboBox1">
                    DropDownClosed="comboBox1_DropDownClosed" 
                    SelectionChanged="comboBox1_SelectionChanged" />
And your code behind

    private bool keepOpen = false;
    private void comboBox1_DropDownClosed(object sender, EventArgs e)
    {
        new Thread(() =>
        {
            comboBox1.Dispatcher.Invoke(new Action(() =>
            {
                // do your IF logic here
                if (keepOpen)
                {
                    comboBox1.IsDropDownOpen = true;
                    keepOpen = false;
                }
            }), null);
        }).Start();
    }

    private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        keepOpen = true;
    }</combobox>

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