如何正確模擬HttpSessionStateBase中的KeysCollection？

Question

我設置從這裏的示例中，這模擬會話對象：How to MOQ an Indexed property

/// <summary> 
/// HTTP session mockup. 
/// </summary> 
internal sealed class HttpSessionMock : HttpSessionStateBase 
{ 
    private readonly Dictionary<string, object> objects = new Dictionary<string, object>(); 

    public override object this[string name] 
    { 
     get { return (objects.ContainsKey(name)) ? objects[name] : null; } 
     set { objects[name] = value; } 
    } 
} 

一些示例代碼，以產生誤差...

var mockSession = new HttpSessionMock(); 
var keys = mockSession.Keys; 

錯誤：的方法或操作未實現。

我需要實現Keys屬性，但不能創建KeysCollection對象。

這樣做的最好方法是什麼？

編輯：[解決方法]

我最終改變基礎上給出了答案HttpSessionMock。這是我結束了。 （我還添加了對System.Linq的引用）。

internal sealed class HttpSessionMock : HttpSessionStateBase 
{ 
    private readonly NameValueCollection objects = new NameValueCollection(); 

    public override object this[string name] 
    { 
     get { return (objects.AllKeys.Contains(name)) ? objects[name] : null; } 
     set { objects[name] = (string)value; } 
    } 

    public override NameObjectCollectionBase.KeysCollection Keys 
    { 
     get { return objects.Keys; } 
    } 
} 

注意：這個模擬會話將只存儲字符串，而不是對象。

Answer 1

我發現原來的方法和組合接受的解決方案允許存儲對象和實現密鑰屬性：

public class HttpSessionMock : HttpSessionStateBase 
{ 
    private readonly NameValueCollection keyCollection = new NameValueCollection(); 
    private readonly Dictionary<string, object> objects = new Dictionary<string, object>(); 

    public override object this[string name] 
    { 
     get 
     { 
      object result = null; 

      if (objects.ContainsKey(name)) 
      { 
       result = objects[name]; 
      } 

      return result; 

     } 
     set 
     { 
      objects[name] = value; 
      keyCollection[name] = null; 
     } 
    } 

    public override NameObjectCollectionBase.KeysCollection Keys 
    { 
     get { return keyCollection.Keys; } 
    } 
} 

Answer 2

更新時間： 供您參考，以下是從.NET框架KeysCollection的源代碼：

public class KeysCollection : ICollection, IEnumerable 
{ 
    // Fields 
    private NameObjectCollectionBase _coll; 

    // Methods 
    internal KeysCollection(NameObjectCollectionBase coll) 
    { 
     this._coll = coll; 
    } 

    public virtual string Get(int index) 
    { 
     return this._coll.BaseGetKey(index); 
    } 

    public IEnumerator GetEnumerator() 
    { 
     return new NameObjectCollectionBase.NameObjectKeysEnumerator(this._coll); 
    } 

    void ICollection.CopyTo(Array array, int index) 
    { 
     if (array == null) 
     { 
      throw new ArgumentNullException("array"); 
     } 
     if (array.Rank != 1) 
     { 
      throw new ArgumentException(SR.GetString("Arg_MultiRank")); 
     } 
     if (index < 0) 
     { 
      throw new ArgumentOutOfRangeException("index", SR.GetString("IndexOutOfRange", new object[] { index.ToString(CultureInfo.CurrentCulture) })); 
     } 
     if ((array.Length - index) < this._coll.Count) 
     { 
      throw new ArgumentException(SR.GetString("Arg_InsufficientSpace")); 
     } 
     IEnumerator enumerator = this.GetEnumerator(); 
     while (enumerator.MoveNext()) 
     { 
      array.SetValue(enumerator.Current, index++); 
     } 
    } 

    // Properties 
    public int Count 
    { 
     get 
     { 
      return this._coll.Count; 
     } 
    } 

    public string this[int index] 
    { 
     get 
     { 
      return this.Get(index); 
     } 
    } 

    bool ICollection.IsSynchronized 
    { 
     get 
     { 
      return false; 
     } 
    } 

    object ICollection.SyncRoot 
    { 
     get 
     { 
      return ((ICollection) this._coll).SyncRoot; 
     } 
    } 
} 

Answer 3

方式一：

internal sealed class HttpSessionMock : HttpSessionStateBase 
{ 
    public override NameObjectCollectionBase.KeysCollection Keys 
    { 
     get { return _collection.Keys; } 
    } 

    private readonly NameValueCollection _collection = new NameValueCollection(); 
}