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如何通过DNN中的代码创建配置文件属性(DotNetNuke)？

我试过这段代码:

DotNetNuke.Entities.Profile.ProfilePropertyDefinition def =
   DotNetNuke.Entities.Profile.ProfileController.GetPropertyDefinitionByName(this.PortalId, "Level");            

if (def != null)
{
    def.DataType = 10;
    def.Length = 40;                   
    def.PropertyValue = "Level";
    def.PropertyName = "Level";

    oUser.Profile.ProfileProperties.Add(def);
}

oUser.Profile.SetProfileProperty("Level", ddlLevel.SelectedItem.Text.ToString().Trim());
DotNetNuke.Entities.Profile.ProfileController.UpdateUserProfile(oUser, oUser.Profile.ProfileProperties);

但它不起作用,请帮助我找到合适的解决方案.