//通过名称设置下拉框选项
static void suilvwenti()
{
var bar = WinApi.FindWindow(null, "商品编码添加");
var child = WinApi.FindWindowEx(bar, IntPtr.Zero, null, "*税率");
var child1 = WinApi.FindWindowEx(bar, child, null, null);
Console.WriteLine($"bar:{bar},child:{child},child1:{child1}");
//通过索引设置下拉框选项
WinApi.SetComboxItemValue(child1, "3%");
}