//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%"); }