獲取System.ArgumentNullException嘗試使用linq到Umb

我試圖從生成的umb數據上下文中獲取信息，但是每當我使用linq表達式時，當我嘗試執行以下代碼時，出現異常：獲取System.ArgumentNullException嘗試使用linq到Umb

MyUmbracoDataContext umbContext = new MyUmbracoDataContext(); 
StringBuilder builder = new StringBuilder(); 
builder.Append(umbContext.Products.Count()); 
return builder.ToString();

例外：

System.ArgumentNullException: 
    Value cannot be null. 
Parameter name: attribute 

    at System.Xml.Linq.XAttribute.op_Explicit(XAttribute attribute) 

    at umbraco.Linq.Core.Node.NodeDataProvider.LoadFromXml[T](XElement xml, T node) 

    at umbraco.Linq.Core.Node.NodeTree`1.GetEnumerator() 

    at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source) 

    at XXX.XXX.Controls.Umbraco.usercontrols.ManageDealers.ToCsv(IEnumerable`1dealers)

生成的代碼是這樣

public partial class Product : DocTypeBase, IProduct 
    { 
     public Product() 
     { 
     } 
     private String _LinkedAccessories; 
     /// <summary> 
     /// Select the accessories that can be combined with this product 
     /// </summary> 
     [UmbracoInfo("linkedAccessories", DisplayName = "Linked accessories", Mandatory = false)] 
     [Property()] 
     [System.Runtime.Serialization.DataMemberAttribute()] 
     public virtual String LinkedAccessories 
     { 
      get 
      { 
       return this._LinkedAccessories; 
      } 
      set 
      { 
       if ((this._LinkedAccessories != value)) 
       { 
        this.RaisePropertyChanging(); 
        this._LinkedAccessories = value; 
        this.IsDirty = true; 
        this.RaisePropertyChanged("LinkedAccessories"); 
       } 
      } 
     } 
     private String _ColumnName; 
     /// <summary> 
     /// 
     /// </summary> 
     [UmbracoInfo("columnName", DisplayName = "Column name", Mandatory = true)] 
     [Property()] 
     [System.Runtime.Serialization.DataMemberAttribute()] 
     public virtual String ColumnName 
     { 
      get 
      { 
       return this._ColumnName; 
      } 
      set 
      { 
       if ((this._ColumnName != value)) 
       { 
        this.RaisePropertyChanging(); 
        this._ColumnName = value; 
        this.IsDirty = true; 
        this.RaisePropertyChanged("ColumnName"); 
       } 
      } 
     } 
     private Int32? _Image; 
     /// <summary> 
     /// Image shown in the main slider 
     /// </summary> 
     [UmbracoInfo("image", DisplayName = "Homepage Slider Image", Mandatory = false)] 
     [Property()] 
     [System.Runtime.Serialization.DataMemberAttribute()] 
     public virtual Int32? Image 
     { 
      get 
      { 
       return this._Image; 
      } 
      set 
      { 
       if ((this._Image != value)) 
       { 
        this.RaisePropertyChanging(); 
        this._Image = value; 
        this.IsDirty = true; 
        this.RaisePropertyChanged("Image"); 
       } 
      } 
     } 
     private Int32? _OverviewImage; 
     /// <summary> 
     /// Image shown on the overview page 
     /// </summary> 
     [UmbracoInfo("overviewImage", DisplayName = "Overview image", Mandatory = false)] 
     [Property()] 
     [System.Runtime.Serialization.DataMemberAttribute()] 
     public virtual Int32? OverviewImage 
     { 
      get 
      { 
       return this._OverviewImage; 
      } 
      set 
      { 
       if ((this._OverviewImage != value)) 
       { 
        this.RaisePropertyChanging(); 
        this._OverviewImage = value; 
        this.IsDirty = true; 
        this.RaisePropertyChanged("OverviewImage"); 
       } 
      } 
     } 
     private Int32? _ProductDetailImage; 
     /// <summary> 
     /// Image shown on the product detail pages 
     /// </summary> 
     [UmbracoInfo("productDetailImage", DisplayName = "Product detail image", Mandatory = false)] 
     [Property()] 
     [System.Runtime.Serialization.DataMemberAttribute()] 
     public virtual Int32? ProductDetailImage 
     { 
      get 
      { 
       return this._ProductDetailImage; 
      } 
      set 
      { 
       if ((this._ProductDetailImage != value)) 
       { 
        this.RaisePropertyChanging(); 
        this._ProductDetailImage = value; 
        this.IsDirty = true; 
        this.RaisePropertyChanged("ProductDetailImage"); 
       } 
      } 
     } 
     private String _RelatedTo; 
     /// <summary> 
     /// 
     /// </summary> 
     [UmbracoInfo("relatedTo", DisplayName = "Related to", Mandatory = false)] 
     [Property()] 
     [System.Runtime.Serialization.DataMemberAttribute()] 
     public virtual String RelatedTo 
     { 
      get 
      { 
       return this._RelatedTo; 
      } 
      set 
      { 
       if ((this._RelatedTo != value)) 
       { 
        this.RaisePropertyChanging(); 
        this._RelatedTo = value; 
        this.IsDirty = true; 
        this.RaisePropertyChanged("RelatedTo"); 
       } 
      } 
     } 
    } 

public partial interface IProduct : IDocTypeBase 
{ 
    String LinkedAccessories { get; set; } 
    String ColumnName { get; set; } 
    Int32? Image { get; set; } 
    Int32? OverviewImage { get; set; } 
    Int32? ProductDetailImage { get; set; } 
    String RelatedTo { get; set; } 
}

來源

2012-02-02 Frederiek

可能是你有一些無效的項目，給umbContext.Products.Count（） – 2012-02-07 12:47:29

添加一些條件我已經解決了它，但是我不能關閉它，因爲沒有獎勵 – Frederiek 2012-02-07 13:08:26

你是怎麼做到的？ – 2012-02-07 20:01:22

這是一個PROBL他們之前就已經發生過，而解決方案正在得到父母，然後又得到了孩子。我們認爲數據庫中存在一些浮動的值

來源

2012-02-07 13:09:25 Frederiek

獲取System.ArgumentNullException嘗試使用linq到Umb

回答

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