Question

以下代码似乎工作正常：

Private Sub frmCalendar_FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs) Handles Me.FormClosing
  If qCal IsNot Nothing Then qCal.Dispose()
End Sub

Visual Studio代码分析会生成警告：
"CA2213 Disposable fields should be disposed 'frmCalendar' contains field 'frmCalendar.qCal' that is of IDisposable type: 'clsCalendar'. Change the Dispose method on 'frmCalendar' to call Dispose or Close on this field."

是否有充分的理由不将Dispose调用留在FormClosing事件中？

Answer 1

通常你会在表单的Dispose（）方法中处理你的对象。这样可以确保只有在不再有对表单的引用时才会处理您的资源。你永远不知道将来有人会想要复活你的封闭表格，现在你已经处理了表格可能需要的资源。在你的情况下它可能无关紧要，但从一般意义上讲，总是将你的处理代码放在Dispose（）方法中

Answer 2

通常当你创建一个表单时，Visual Studio会为你生成Dispose函数，所以你不需要，例如在C＃中你得到：

partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.Text = "Form1";
        }

        #endregion
    }

您应该在FormClosing事件中处置项目吗？

2 个答案: