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.Drawinghttp://www.devze.com.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;
   php         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())js; //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：开发者_Go开发

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
            Closepython_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phpClose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。

到此这篇关于C# try catch代码块不起效果的解决方法的文章就介绍到这了,更多相关C# try catch代码块不起效果内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们！