将 varchar 转换为 IHtmlString

public class IHtmlStringTypeHandler : SqlMapper.TypeHandler<IHtmlString>
{
    public override void SetValue(
        IDbDataParameter parameter, 
        IHtmlString value)
    {
        parameter.DbType = DbType.String;
        parameter.Value = value?.ToHtmlString();
    }

    public override IHtmlString Parse(object value)
    {
        return MvcHtmlString.Create(value?.ToString());
    }
}