Question

下面是一些代码，这些代码可以处理一批多个XML文件，并将它们添加到数据集中的自己的数据表中：

    private void Btn_Import_Click(object sender, RoutedEventArgs e)
    {

        /*ILRChecks.ILRReport.NullChecks();
        ILRChecks.ILRReport.CrossYear();*/

        DataSet dataSet = new DataSet();
        DataTable diff = new DataTable();
        diff.TableName = "Differences";

        diff.Columns.Add("LearnRefNumber");
        diff.Columns.Add("ULN");
        //diff.Columns.Add("FamilyName");
        //diff.Columns.Add("GivenNames");
        diff.Columns.Add("DateofBirth");
        diff.Columns.Add("NINumber");
        diff.Columns.Add("Message");

        Dictionary<int,DataTable> Tables = new Dictionary<int,DataTable>();


        foreach (string str_FileLocation in Global.fileNames)
        {
            FileInfo fileInfo = new FileInfo(str_FileLocation);
            string str_xmlFileName = fileInfo.Name;

            XDocument doc = XDocument.Load(str_FileLocation);

            var ns = doc.Root.GetDefaultNamespace();
            var learner = doc.Descendants(ns + "Learner");

            string shortfile = str_xmlFileName.Substring(13,4);

            StringReader reader = new StringReader(new XElement("Sample", learner).ToString());

            DataSet ds = new DataSet();
            ds.ReadXml(reader);

            Tables.Add(int.Parse(shortfile), ds.Tables[0]);

            DataTable dt = ds.Tables[0].Copy();
            dt.TableName = shortfile;

            dataSet.Tables.Add(dt);
        }

然后，从这里开始，我希望能够依次遍历这些数据集，并按数据表名称的顺序对它们进行比较。名称已被转换为Integers（整数），需要从最近的年份开始，因此取决于文件的数量，分别是1819、1718等。我相信我有一条有效的foreach语句，允许循环获取正确的表顺序并将其放入当前项目表中：

        foreach (var item in Tables.OrderByDescending(k => k.Key))
        {

            if (item.Key != Tables.OrderByDescending(k => k.Key).Last().Key)
            {
                DataTable dataTable_CurrentItem = item.Value;


            }

            }

然后从这里开始，我有一部分代码可以独立运行，但是我需要将其作为循环的一部分并入上面，在进行过程中比较文件，但我怀疑这部分内容并不完全对，以及是否应该在上面的foreach语句中使用，我不确定：

       var diff_ULNDOB = from Latest in dataSet.Tables["1819"].AsEnumerable()
                                 join previous in dataSet.Tables["1718"].AsEnumerable()
                                 on Latest.Field<string>("ULN") equals previous.Field<string>("ULN")
                                 where Latest.Field<string>("DateofBirth") != previous.Field<string>("DateofBirth")
                                 select new { ULN = Latest.Field<string>("ULN"), FamilyName = Latest.Field<string>("FamilyName") };

        if (diff_ULNDOB.Any())
        {.
            MessageBox.Show("PROBLEM!!!!!!");
        }

Answer 1

请参阅下面的更改。您不需要使用DataSet。您可以只使用DataTable。：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Data;
using System.Threading.Tasks;

namespace ConsoleApplication100
{

    class Program
    {

        static void Main(string[] args)
        {

        }


    }
    public class test
    {
        private void Btn_Import_Click(object sender, RoutedEventArgs e)
        {

            /*ILRChecks.ILRReport.NullChecks();
            ILRChecks.ILRReport.CrossYear();*/

            DataSet dataSet = new DataSet();
            DataTable diff = new DataTable();
            diff.TableName = "Differences";

            diff.Columns.Add("LearnRefNumber");
            diff.Columns.Add("ULN");
            //diff.Columns.Add("FamilyName");
            //diff.Columns.Add("GivenNames");
            diff.Columns.Add("DateofBirth");
            diff.Columns.Add("NINumber");
            diff.Columns.Add("Message");

            Dictionary<int, DataTable> Tables = new Dictionary<int, DataTable>();

            foreach (string str_FileLocation in Global.fileNames)
            {
                FileInfo fileInfo = new FileInfo(str_FileLocation);
                string str_xmlFileName = fileInfo.Name;

                XDocument doc = XDocument.Load(str_FileLocation);

                var ns = doc.Root.GetDefaultNamespace();
                var learner = doc.Descendants(ns + "Learner");

                string shortfile = str_xmlFileName.Substring(13, 4);

                StringReader reader = new StringReader(new XElement("Sample", learner).ToString());

                DataTable dt = new DataTable();

                dt.ReadXml(reader);

                Tables.Add(int.Parse(shortfile), dt);
            }
            var orderTables = Tables.OrderByDescending(k => k.Key).ToList();
            for (int i = 1; i <= orderTables.Count(); i--)
            {

                var diff_ULNDOB = from Latest in orderTables[i].AsEnumerable()
                                join previous in orderTables[i - 1].AsEnumerable()
                                on Latest.Field<string>("ULN") equals previous.Field<string>("ULN")
                                where Latest.Field<string>("DateofBirth") != previous.Field<string>("DateofBirth")
                                select new { ULN = Latest.Field<string>("ULN"), FamilyName = Latest.Field<string>("FamilyName") };

            }


        }
    }
}

遍历数据表选择数据C＃

1 个答案: