C# 比较两个文件夹中文件的异同

C# 比较两个文件夹中文件的异同

 

     这几天要写个工具，来比较两个文件夹下的N个xml文件内节点属性值的异同，起初两个文件夹内的xml文件很工整，名字一样，数量也一样，直接依次比较就可以。后来文件夹内的文件有时候数量不一样，这样的话必须过滤掉不同的，修改代码的话，感觉还是在获取文件目录的时候提前修改，这样一劳永逸，后边的代码就完全不用修改了。 查了一些资料，发现几段给力的代码，稍作修改，顺利完工。

      主要资料来源 ： spring yang博客： http://www.cnblogs.com/springyangwc/archive/2011/03/18/1988177.html

                            MSDN： http://msdn.microsoft.com/zh-cn/library/bb546137(v=vs.90).aspx 

 

      核心代码如下：

                    //获得两个文件夹目录
                       DirectoryInfo di1 = new DirectoryInfo(txtBoxOldPath.Text);
                    DirectoryInfo di2 = new DirectoryInfo(txtBoxNewPath.Text);
                    //获得文件夹下所有文件信息（不包含子目录）
                       FileSystemInfo[] dsi1 = di1.GetFileSystemInfos("*.xml");
                    FileSystemInfo[] dsi2 = di2.GetFileSystemInfos("*.xml");

                    //find All Files.  （包含子目录） 
                       IEnumerable<System.IO.FileInfo> list1 = di1.GetFiles("*.xml", System.IO.SearchOption.AllDirectories);
                    IEnumerable<System.IO.FileInfo> list2 = di2.GetFiles("*.xml", System.IO.SearchOption.AllDirectories);

                    List<string> filelistone = new List<string>();
                    List<string> filelisttwo = new List<string>();
                    List<string> errorlist = new List<string>();
                    List<string> messagelist = new List<string>(); 
                    //To List with Relative Path. 把文件相对路径添加到list
                    foreach (System.IO.FileInfo files in list1)
                    {
                        string filepathone = files.DirectoryName.Replace(txtBoxOldPath.Text, "") + "\\" + files.Name;
                        filelistone.Add(filepathone);
                    }

                    //To List with Relative Path.  
                    foreach (System.IO.FileInfo files in list2)
                    {
                        string filepathtwo = files.DirectoryName.Replace(txtBoxNewPath.Text, "") + "\\" + files.Name;
                        filelisttwo.Add(filepathtwo);
                    }

                    //check Is Same 两个文件夹下文件数量、名字完全相同，把文件列表放到listbox 控件里
                    bool areIdentical = filelistone.SequenceEqual(filelisttwo);
                    if (areIdentical == true)
                    {
                        messagelist.Add("the two folders are the same.\n");
                        lstBoxOldScript.Visible = true;
                        //filelistone.Insert(0,"the two folders are the same.\n");
                        lstBoxOldScript.DataSource = filelistone;
                        lstBoxNewScript.Visible = true;
                        //filelisttwo.Insert(0,"the two folders are the same.\n");
                        lstBoxNewScript.DataSource = filelisttwo;
                    }
                    else
                    {
                        errorlist.Add("The two folders are not the same.\n");



                        //Find Same  如果两个文件夹不完全相同，找出相同的文件，添加到messagelist
                        var queryCommonFiles = filelistone.Intersect(filelisttwo);
                        if (queryCommonFiles.Count() > 0)
                        {                            
                            //messagelist.Add("The following files are in both folders:\n"); 可以加入Log
                            foreach (var v in queryCommonFiles)
                            {
                                messagelist.Add(v);
                            }
                        }
                        else
                        {
                            errorlist.Add("There are no common files in the two folders.\n");
                        }

                        // Find not Same. 查找不同的文件，添加到列表里面errorlist
                        var queryList1Only = (from file in filelistone select file).Except(filelisttwo);
                        errorlist.Add("The following files are in list1 but not list2:\n");
                        foreach (var v in queryList1Only)
                        {
                            errorlist.Add(v + "\n");
                        }

                        //按需求执行操作，把列表里面的值添加到Winform ListBox控件中
                        if (dsi1.Length < 1)
                        {
                            MessageBox.Show("The folder is empty！", "error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        }
                        else
                        {
                            lstBoxOldScript.Visible = true;
                            lstBoxOldScript.DataSource = messagelist;
                        }
                        if (dsi2.Length < 1)
                        {
                            MessageBox.Show("The folder is empty！", "error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        }
                        else
                        {
                            lstBoxNewScript.Visible = true;
                            lstBoxNewScript.DataSource = messagelist;
                        }
                    }
                }