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Proxy.cs
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Proxy.cs
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namespace DesignPatterns.Structural;
public class Proxy
{
[Fact]
public void Execute()
{
IFriend friend = new FriendOverPhone();
Assert.False(((FriendOverPhone)friend).IsConnectedToFriend);
friend.Talk();
Assert.True(((FriendOverPhone)friend).IsConnectedToFriend);
}
/* Subject */
public interface IFriend
{
void Talk();
}
/* Real subject */
public class Friend : IFriend
{
public void Talk()
{
}
}
/* Proxy */
public class FriendOverPhone : IFriend
{
public bool IsConnectedToFriend => Friend != null;
private Friend Friend { get; set; }
public void Talk()
{
if (!IsConnectedToFriend)
{
CallFriend();
}
Friend.Talk();
}
private void CallFriend()
{
Friend = new Friend();
}
}
}