C# LINQ

DataTable Detail = EditData.Tables[dt_MyUserRole._TableName].Copy();

           Detail.AcceptChanges();

           var enumTable = from d1 in dtRoleAuthority.AsEnumerable()

                           join d2 in Detail.AsEnumerable()

                           on d1.Field<string>(dt_MyRole.RoleID) equals

                              d2.Field<string>(dt_MyUserRole.RoleID)

                           select new

                           {

                               RoldID = d1.Field<string>(dt_MyRoleAuthority.RoleID),

                               FullName = d1.Field<string>(dt_MyRoleAuthority.FullName),

                               Authority = d1.Field<int>(dt_MyRoleAuthority.Authority),

                               PKey = d1.Field<string>(dt_MyRoleAuthority.FullName) + "." + d1.Field<int>(dt_MyRoleAuthority.Authority)

                           };

           TreeListNode node;

           foreach (var v in enumTable)

           {

               node = tree_Module.FindNodeByKeyID(v.PKey);

               if (node != null)

                   _TreeListInitial.SetNodeCheckState(node, CheckState.Checked);

           }

 

//需要新增的

            //需要删除的

            //需要替换的



            var DataEdit = from dtLocation in LocalDetailFiles.AsEnumerable()

                           join dtServer in ServerDetailFiles.AsEnumerable()

                           on dtLocation.Field<string>(DataSchema.DetailSchema.Path) + dtLocation.Field<string>(DataSchema.DetailSchema.Name) equals

                              dtServer.Field<string>(DataSchema.DetailSchema.Path) + dtServer.Field<string>(DataSchema.DetailSchema.Name)

                           where dtLocation.Field<DateTime>(DataSchema.DetailSchema.EditDate) > dtServer.Field<DateTime>(DataSchema.DetailSchema.EditDate)

                           select new

                           {

                               Name = dtLocation.Field<string>(DataSchema.DetailSchema.Name),

                               Path = dtLocation.Field<string>(DataSchema.DetailSchema.Path)

                           };

            var DataAdd = from dtLocal in LocalDetailFiles.AsEnumerable()

                          where !ServerDetailFiles.AsEnumerable().Any(y => y.Field<string>(DataSchema.DetailSchema.Path) + y.Field<string>(DataSchema.DetailSchema.Name) == dtLocal.Field<string>(DataSchema.DetailSchema.Path) + dtLocal.Field<string>(DataSchema.DetailSchema.Name))

                          select new

                          {

                              Name = dtLocal.Field<string>(DataSchema.DetailSchema.Name),

                              Path = dtLocal.Field<string>(DataSchema.DetailSchema.Path)

                          };

            var DataDelete = from dtServer in ServerDetailFiles.AsEnumerable()

                             where !LocalDetailFiles.AsEnumerable().Any(y => y.Field<string>(DataSchema.DetailSchema.Path) + y.Field<string>(DataSchema.DetailSchema.Name) == dtServer.Field<string>(DataSchema.DetailSchema.Path) + dtServer.Field<string>(DataSchema.DetailSchema.Name))

                             select new

                             {

                                 Name = dtServer.Field<string>(DataSchema.DetailSchema.Name),

                                 Path = dtServer.Field<string>(DataSchema.DetailSchema.Path)

                             };



            dtUpdateFiles = new DataTable();

            dtUpdateFiles.Columns.Add("Name", typeof(System.String));

            dtUpdateFiles.Columns.Add("Path", typeof(System.String));

            dtUpdateFiles.Columns.Add("Type", typeof(System.String));



            foreach (var v in DataAdd)

            {

                DataRow dr = dtUpdateFiles.Rows.Add();

                dr["Type"] = "1";

                dr["Name"] = v.Name;

                dr["Path"] = v.Path;



                //ListViewItem item = new ListViewItem("新增");

                //item.SubItems.Add(v.Name);//文件名

                //item.SubItems.Add(v.Path);//路径

                //LVFile.Items.Add(item);

            }

            foreach (var v in DataEdit)

            {

                DataRow dr = dtUpdateFiles.Rows.Add();

                dr["Type"] = "2";

                dr["Name"] = v.Name;

                dr["Path"] = v.Path;



                //ListViewItem item = new ListViewItem("替换");

                //item.SubItems.Add(v.Name);//文件名

                //item.SubItems.Add(v.Path);//路径

                //LVFile.Items.Add(item);

            }

            foreach (var v in DataDelete)

            {

                DataRow dr = dtUpdateFiles.Rows.Add();

                dr["Type"] = "3";

                dr["Name"] = v.Name;

                dr["Path"] = v.Path;



                //ListViewItem item = new ListViewItem("删除");

                //item.SubItems.Add(v.Name);//文件名

                //item.SubItems.Add(v.Path);//路径

                //LVFile.Items.Add(item);

            }