c# - 如何正确模拟 HttpSessionStateBase 中的 KeysCollection？

Question

我在这里的示例中设置了这个模拟 session 对象: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，但无法创建 KeysCollection 对象。

执行此操作的最佳方法是什么？

编辑:[解决方案]

我最终根据给出的答案更改了 HttpSessionMock。这就是我最终得到的。 (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 session 将只存储字符串，而不是对象。

Answer 1

我发现原始方法和公认解决方案的组合允许存储对象和实现 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; }
    }
}