c# - 处理组件

Question

我试图向用户显示新旧版本号，然后复制新版本。当我在显示版本信息后尝试复制文件时，出现以下异常

The process cannot access the file 'C:\Auto TEC\Common.dll' because it is being used by another process.

代码如下:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Reflection;
using System.Diagnostics;

namespace copyfile
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

       private void button1_Click(object sender, EventArgs e)
        {


            string sourceDirectory = @"E:\newversion\Auto TEC";
            string targetDirectory = @"C:\Auto TEC";

            Copy(sourceDirectory, targetDirectory);
            label3.Text = "sucess";
            loadAssembyNames();

        }

       void f2_FormClosed(object sender, FormClosedEventArgs e)
       {
           this.Close();
       }
       public static void Copy(string sourceDirectory, string targetDirectory)
       {
           DirectoryInfo diSource = new DirectoryInfo(sourceDirectory);
           DirectoryInfo diTarget = new DirectoryInfo(targetDirectory);

           CopyAll(diSource, diTarget);


       }

       public static void CopyAll(DirectoryInfo source, DirectoryInfo target)
       {
           // Check if the target directory exists, if not, create it.
           if (Directory.Exists(target.FullName) == false)
           {
               Directory.CreateDirectory(target.FullName);
           }

           // Copy each file into it's new directory.
           foreach (FileInfo fi in source.GetFiles())
           {  

               fi.CopyTo(Path.Combine(target.ToString(), fi.Name), true);
           }

           // Copy each subdirectory using recursion.
           foreach (DirectoryInfo diSourceSubDir in source.GetDirectories())
           {
               DirectoryInfo nextTargetSubDir =
                   target.CreateSubdirectory(diSourceSubDir.Name);
               CopyAll(diSourceSubDir, nextTargetSubDir);
           }

       }
        string _errMsg;
        //private AssemblyInformation _info;
        private void getfilenames(string directoryPath, int location)
        {  
            string[] path = new string[25];
            int count = 0;
            foreach (string file in System.IO.Directory.GetFiles(directoryPath))
            {
                path[count] = file;
                count++;

            }

            Assembly asm = null;


                for (int i = 0; i < count; i++)
                {  
                    try
                    {
                       //asm = Assembly.LoadFrom(path[i]);
                        asm = Assembly.LoadFile(path[i]);
                        if (asm != null)
                        {
                            if (location == 1)
                            {
                                listBox1.Items.Add(asm.GetName().Name + asm.GetName().Version.ToString());

                            }
                            else
                            {
                                listBox2.Items.Add(asm.GetName().Name + asm.GetName().Version.ToString());
                            }
                        }
                    }
                    catch (Exception err)
                    {
                      this._errMsg = err.Message;
                    }
                }

                asm = null;

                GC.Collect();

        }



        private void Form1_Load(object sender, EventArgs e)
        {
            loadAssembyNames();

        }

        private void loadAssembyNames()
        {
            listBox1.Items.Clear();
            listBox2.Items.Clear();
            getfilenames(@"C:\Auto TEC", 1);

            getfilenames(@"E:\newversion\Auto TEC", 2);
        }
    }
}

如何从对象中卸载程序集信息？

Answer 1

如果不卸载包含它的所有应用程序域，就无法卸载单个程序集。因此，您应该为每个程序集使用不同的应用程序域。

更多信息:

• Unloading an assembly
• Assembly Unload? Use AppDomain.Unload instead