■ WeakReference 클래스를 사용해 약한 참조 만드는 방법을 보여준다.
▶ Container.cs
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namespace TestProject { /// <summary> /// 컨테이너 /// </summary> public class Container { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Public #region Field /// <summary> /// 데이터 /// </summary> public string Data; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - Container(data) /// <summary> /// 생성자 /// </summary> /// <param name="data">데이터</param> public Container(string data) { Data = data; } #endregion } } |
▶ MainForm.cs
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using System; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 전화 컨테이너 /// </summary> private Container phoneContainer; /// <summary> /// 노트북 컨테이너 /// </summary> private Container notebookContainer; /// <summary> /// 컨테이너 1 /// </summary> private Container container1; /// <summary> /// 컨테이너 2 /// </summary> private WeakReference container2; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.phoneContainer = new Container("Phone" ); this.notebookContainer = new Container("NoteBook"); this.container1 = this.phoneContainer; this.container2 = new WeakReference(this.notebookContainer); this.containerValueLabel1.Text = this.container1 == null ? "null" : this.container1.Data; this.containerValueLabel2.Text = this.container2.Target == null ? "null" : (this.container2.Target as Container).Data; this.collectButton.Click += collectButton_Click; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private #region GC 수집 버튼 클릭시 처리하기 - collectButton_Click(sender, e) /// <summary> /// GC 수집 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void collectButton_Click(object sender, EventArgs e) { this.phoneContainer = null; this.notebookContainer = null; GC.Collect(0, GCCollectionMode.Forced); GC.WaitForFullGCComplete(); this.containerValueLabel1.Text = this.container1 == null ? "null" : this.container1.Data; this.containerValueLabel2.Text = this.container2.Target == null ? "null" : (this.container2.Target as Container).Data; } #endregion } } |
