我怎样才能正确地模拟HttpSessionStateBase中的KeysCollection

本文关键字：模拟 HttpSessionStateBase 中的 KeysCollection 正确地 | 更新日期: 2023-09-27 18:04:56

我从下面的示例中设置了这个模拟会话对象:

/// <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; }
    }
}

一些产生错误的示例代码…

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

错误:方法或操作未实现

我需要实现Keys属性，但是不能创建一个KeysCollection对象。

最好的方法是什么?

编辑(解决方案):

我最终根据给出的答案更改了httpessionmock。这就是我最后得到的。(我还添加了对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:这个模拟会话只存储字符串，不存储对象。

我怎样才能正确地模拟HttpSessionStateBase中的KeysCollection

我发现了一种原始方法和公认的解决方案的组合，既可以存储对象，又可以实现keys属性:

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; }
    }
}

单向:

internal sealed class HttpSessionMock : HttpSessionStateBase
{
    public override NameObjectCollectionBase.KeysCollection Keys
    {
        get { return _collection.Keys; }
    }
    private readonly NameValueCollection _collection = new NameValueCollection();
}

更新:以下是。net框架中的KeysCollection的源代码，供您参考:

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;
        }
    }
}
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