如何將IEnumerable轉換爲Subsonic集合？

Question

真的很尷尬的問題 - 我有亞音速收集，然後我用Where過濾掉一些數據。

MyColl.Where(it => it.foo()==true) 

現在我想將這些數據仍然作爲Subsonic集合。如何做到這一點（最合適的方式）？我檢查了Subsonic集合，ToX（）方法的構造函數，並使用Google搜索。

編輯：Subsonic 2.x系列。

在此先感謝您，對於天真的問題抱歉。

Answer 1

在SubSonic 2.x中，數據實際上沒有用Where（）過濾出來，直到對數據庫重新執行查詢。我假設這在3.0中是一樣的。在2.x中有一個.Filter（）方法可以做你正在尋找的東西。

.Filter（）方法被添加到生成的類中。下面是我的樣子（它從默認定製）：

/// <summary> 
    /// Filters an existing collection based on the set criteria. This is an in-memory filter. 
    /// All existing wheres are retained. 
    /// </summary> 
    /// <returns>TblSomethingOrOtherCollection</returns> 
    public TblSomethingOrOtherCollection Filter(SubSonic.Where w) 
    { 
     return Filter(w, false); 
    } 

    /// <summary> 
    /// Filters an existing collection based on the set criteria. This is an in-memory filter. 
    /// Existing wheres can be cleared if not needed. 
    /// </summary> 
    /// <returns>TblSomethingOrOtherCollection</returns> 
    public TblSomethingOrOtherCollection Filter(SubSonic.Where w, bool clearWheres) 
    { 
     if (clearWheres) 
     { 
      this.wheres.Clear(); 
     } 
     this.wheres.Add(w); 
     return Filter(); 
    } 

    /// <summary> 
    /// Filters an existing collection based on the set criteria. This is an in-memory filter. 
    /// Thanks to developingchris for this! 
    /// </summary> 
    /// <returns>TblSomethingOrOtherCollection</returns> 
    public TblSomethingOrOtherCollection Filter() 
    { 
     for (int i = this.Count - 1; i > -1; i--) 
     { 
      TblSomethingOrOther o = this[i]; 
      foreach (SubSonic.Where w in this.wheres) 
      { 
       bool remove = false; 
       System.Reflection.PropertyInfo pi = o.GetType().GetProperty(w.ColumnName); 
       if (pi != null && pi.CanRead) 
       { 
        object val = pi.GetValue(o, null); 
        if (w.ParameterValue is Array) 
        { 
         Array paramValues = (Array)w.ParameterValue; 
         foreach (object arrayVal in paramValues) 
         { 
          remove = !Utility.IsMatch(w.Comparison, val, arrayVal); 
          if (remove) 
           break; 
         } 
        } 
        else 
        { 
         remove = !Utility.IsMatch(w.Comparison, val, w.ParameterValue); 
        } 
       } 


       if (remove) 
       { 
        this.Remove(o); 
        break; 
       } 
      } 
     } 
     return this; 
    } 


} 

Answer 2

出於某種原因，我永遠無法得到過濾器的直線排列方式工作，但其易於使用這樣的：

SubSonic.Where w = new Where(); 
     w.ColumnName = Product.CatIDColumn.PropertyName; 
     w.Comparison = Comparison.Equals; 
     w.ParameterValue = "1"; 

ProductCollection objFilteredCol = objProdCollection.Where(w).Filter();