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屬性的讀取應該先查詢對應屬性是否存在，否則會出錯

body.HasUserAttribute("DB_PART_NO", NXObject.AttributeType.String, -1) 

獲取體的屬性的示范

/// <summary>
/// 獲取體的編號
/// </summary>
protected string AskBodyName(Body body)
{
    string partNo = body.HasUserAttribute("DB_PART_NO", NXObject.AttributeType.String, -1) ? body.GetStringAttribute("DB_PART_NO"):"";
    string name = body.IsOccurrence ? body.OwningComponent.DisplayName : partNo;
    return name;
}