设置依赖项属性时出现灾难性错误

我在将依赖项属性设置为 XAML 元素时遇到问题。XAML：

        <local2:RichTextColumns xmlns:local2="using:App2.Common">
            <local2:RichTextColumns.ColumnTemplate>
                <DataTemplate x:Name="overflowControl1">
                    <RichTextBlockOverflow Width="1000" Margin="5,0,0,0"/>
                </DataTemplate>
            </local2:RichTextColumns.ColumnTemplate>
            <RichTextBlock Foreground="Black" Width="1000">
                <Paragraph>
                </Paragraph>
            </RichTextBlock>
        </local2:RichTextColumns>

C#

var tmp = (DataTemplate)FindName("overflowControl1");
tmp.SetValue(RichTextBlockOverflow.ActualWidthProperty, 100);

它导致

灾难性故障（HRESULT 的例外：0x8000FFFF （E_UNEXPECTED））。

我也尝试使用RichTextBlockOverflow.WidthProperty

提前谢谢你:)

<local2:RichTextColumns xmlns:local2="using:App2.Common">
        <local2:RichTextColumns.ColumnTemplate>
            <DataTemplate>
                <RichTextBlockOverflow  x:Name="overflowControl1" Width="1000" Margin="5,0,0,0"/>
            </DataTemplate>
        </local2:RichTextColumns.ColumnTemplate>
        <RichTextBlock Foreground="Black" Width="1000">
            <Paragraph>
            </Paragraph>
        </RichTextBlock>
    </local2:RichTextColumns>

var tmp = (RichTextBlockOverflow)FindName("overflowControl1");
tmp.SetValue(RichTextBlockOverflow.WidthProperty, 100);