[ここ壊れてます] .net
>>681
WinUI3だとこれでいける
.xaml
<TextBox x:Name="ele" Text="aaaaaaaaaaaaaaaa
iiiiiiiiiiiiiiiiiii
uuuuuuuuuuuuuuuuuuu
eeeeeeeeeeeeeeeeeee" Width="100">
<ToolTipService.ToolTip>
<ToolTip x:Name="tip"/>
</ToolTipService.ToolTip>
</TextBox>
.cs
public MainWindow()
{
this.InitializeComponent();
tip.Content = ele.Text;
}
URLﾘﾝｸ(imgur.com)