方便添加格式纯粹文本
<dx:ASPxHtmlEditor ID="ASPxHtmlEditor1" runat="server" ToolbarMode="None">
<Settings AllowHtmlView="False" AllowPreview="False">
</Settings>
<SettingsHtmlEditing>
<PasteFiltering Attributes="class"></PasteFiltering>
</SettingsHtmlEditing>
</dx:ASPxHtmlEditor>