使用自定義實體的數據綁定

Question

我有問題，使用我的自定義實體類排序我的GridView

我複雜的實體排序問題

public class Subscription 
{ 

    public string SubscriptionID { get; set; } 
    public string Status { get; set; } 
    public Customer { get; set; } //Contained class from another entity 
} 


public class Customer 
{ 
    public string CustomerID { get; set; } 
    public CustomerName { get; set; } 
} 

結合的GridView

List<Subscription> subscriptions = GetSubscriptions(); 


//sorting, sortEvent is the GridviewSortEvenArgs param 
subscriptions.Sort(new GenericComparer<Subscription>(sortEvent.SortExpression, GridViewSortDirection)); 



grdSubscription.DataSource = subscriptions; 
grdSubscription.DataBind(); 

我用模板字段綁定我的實體字段到電網

  <asp:TemplateField HeaderText="Subscription ID" SortExpression="SubscriptionID"> 
        <ItemTemplate> 
         <%# Eval(" SubscriptionID ") %> 
        </ItemTemplate> 
       </asp:TemplateField> 
     <asp:TemplateField HeaderText="Customer Name" SortExpression="CustomerName"> 
        <ItemTemplate> 
         <%# Eval(" Customer.CustomerName ") %> 
        </ItemTemplate> 
       </asp:TemplateField> 

現在排序，其工作正常排序時認購的原生屬性

 <asp:TemplateField HeaderText="Subscription ID" SortExpression="SubscriptionID"> 

但我有在排序包含類的屬性（客戶）的問題

 <asp:TemplateField HeaderText="Customer Name" SortExpression="CustomerName"> 
       <ItemTemplate> 
        <%# Eval(" Customer.CustomerName ") %> 
       </ItemTemplate> 

我試過的SortExpression =」 Customer.CustomerName」，但無濟於事

我用這個GenericComparer分揀格

public class GenericComparer<T> : IComparer<T> 
{ 
    private SortDirection sortDirection; 

    public SortDirection SortDirection 
    { 
     get { return this.sortDirection; } 
     set { this.sortDirection = value; } 

    } 

    private string sortExpression; 

    public GenericComparer(string sortExpression, SortDirection sortDirection) 
    { 
     this.sortExpression = sortExpression; 
     this.sortDirection = sortDirection; 
    } 

    public int Compare(T x, T y) 
    { 
     PropertyInfo propertyInfo = typeof(T).GetProperty(sortExpression); 

     IComparable obj1 = (IComparable)propertyInfo.GetValue(x, null); 
     IComparable obj2 = (IComparable)propertyInfo.GetValue(y, null); 

     if (SortDirection == SortDirection.Ascending) 
     { 
      return obj1.CompareTo(obj2); 
     } 

     else return obj2.CompareTo(obj1); 
    } 
} 

個

其他詳細信息：

 protected SortDirection GridViewSortDirection 
{ 
    get 
    { 
     // Checks for the first time when the ViewState sort direction is null 
     if (ViewState["sortDirection"] == null) 
      ViewState["sortDirection"] = SortDirection.Ascending; 
     // Changes the sort direction 
     else 
     { 
      if (((SortDirection)ViewState["sortDirection"]) == SortDirection.Ascending) 
      { 
       ViewState["sortDirection"] = SortDirection.Descending; 
      } 
      else 
      { 
       ViewState["sortDirection"] = SortDirection.Ascending; 
      } 
     } 
     return (SortDirection)ViewState["sortDirection"]; 
    } 
    set 
    { 
     ViewState["sortDirection"] = value; 

    } 
} 

請指教，謝謝提前，你可以嘗試

Answer 1

一個快速和骯髒的東西是一個客戶名稱屬性添加到您的訂閱類。我通常在使用Silverlight/WCF/EF時在客戶端代碼部分類中執行此操作。

public string CustomerName 
{ get 
    { return Customer != null ? Customer.CustomerName : string.empty } 
} 

然後從您的用戶界面引用此屬性。