C# try catch代码块不起效果的解决方法
我上次编写winform程序时发生了ObjectDisposedException,后来使用了try catch代码块还是没有解决,源代码:
using System.Windows.Forms; using System; using System.Drawing; using System.Drawing.Drawing2D; class Program { /// <summary> /// 应用程序的主入口点 /// </summary> [STAThread] static void Main() { Application.Run(new MainForm()); //在这里,视觉样式是默认的样式,以系统的默认样式为基准 } } public class MainForm : Form { public MainForm() { FormPanel fp = new FormPanel(20); fp.Location = new Point(0, 0); } } public class FormPanel : UserControl { public Panel Head = new Panel(); public Label Close_Label = new Label(); public FormPanel(int Head_Height) { #region Head Head.Parent = this; Head.Dock = DockStyle.Top; Head.Height = Head_Height; #endregion Head Form f1 = new Form(); this.Parent = f1; #region Close_Label Close_Label.Parent = Head; Close_Label.Dock = DockStyle.Right; Close_Label.AutoSize = true; Close_Label.Text = "x"; //这里的x不是x,为了美观,输入了全角字符,不要随便使用 Close_Label.MouseClick += (sender, e) => { if (e.Button == MouseButtons.Left) { f1.Close(); this.Dispose(); } } #endregion } }
endregion后面可以添加任何字符,编译后相当于不存在,也就是单行注释,但不能删除,因为有region
加上try catch代码块以后:
using System.Windows.Forms; using System; using System.Drawing; using System.Drawing.Drawing2D; class Program { /// <summary> /// 应用程序的主入口点 /// </summary> [STAThread] static void Main() { Application.Run(new MainForm()); //在这里,视觉样式是默认的样式,以系统的默认样式为基准 } } public class MainForm : Form { public MainForm() { FormPanel fp = new FormPanel(20); fp.Location = new Point(0, 0); } } public class FormPanel : UserControl { public Panel Head = new Panel(); public Label Close_Label = new Label(); public FormPanel(int Head_Height) { #region Head Head.Parent = this; Head.Dock = DockStyle.Top; Head.Height = Head_Height; #endregion Head Form f1 = new Form(); this.Parent = f1; #region Close_Label Close_Label.Parent = Head; Close_Label.Dock = DockStyle.Right; Close_Label.AutoSize = true; Close_Label.Text = "x"; //这里的x不是x,为了美观,输入了全角字符,不要随便使用 Close_Label.MouseClick += (sender, e) => { if (e.Button == MouseButtons.Left) { try { f1.Close(); this.Dispose(); } catch { } } } #endregion } }
原因是:
f1.Close()导致执行了FormPanel.Dispose(),这样try catch代码块不在class外面,解决方法:
public class FormPanel : UserControl { public void Close(IsDispose) { this.Parent = null; f1.Close(); if (IsDispose) this.Dispose(); } Form f1 = new Form(); //将f1设为全局变量 public Panel Head = new Panel(); public Label Close_Label = new Label(); public FormPanel(int Head_Height, bool CloseIsDispose) { #region Head Head.Parent = this; Head.Dock = DockStyle.Top; Head.Height = Head_Height; #endregion Head this.Parent = f1; #region Close_Label Close_Label.Parent = Head; Close_Label.Dock = DockStyle.Right; Close_Label.AutoSize = true; Close_Label.Text = "x"; //这里的x不是x,为了美观,输入了全角字符,不要随便使用 Close_Label.MouseClick += (sender, e) => { if (e.Button == MouseButtons.Left) { this.Close(CloseIsDispose); } } #endregion } }
总结:尽量不要手动添加代码关闭这个控件类的父窗体,如要关闭父窗体,请确认Close函数要在所有代码之后,否则设置这个控件类的父容器为null,再关闭父窗体,执行完所有代码之后,清除这个控件类。
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