如何用XElement / XAttribute填充数据表？

Question

I'm new to C#, I never worked with a DataTable before.

I want a DataGridView with specific names.

        DataTable table = new DataTable();
        List<string> bla = new List<string>();

        XDocument config = XDocument.Load(configFile);

        Dictionary<string, string> dict = config.Descendants("Columns").FirstOrDefault().Elements()
            .GroupBy(x => (string)x.Attribute("XPath"), y => (string)y.Attribute("Name"))
            .ToDictionary(x => x.Key, y => y.FirstOrDefault());

        //I dont know if I need this:
        foreach (string key in dict.Keys)
        {
            table.Columns.Add(key, typeof(string));
        }


        foreach (XElement position in positions.Where(e => e.HasAttributes))
        {
            foreach (XAttribute attribute in position.Attributes().Where(a => dict.ContainsKey($"@{a.Name.LocalName}")))
            {
                string name = attribute.Name.LocalName;
                string value = (string)attribute;
                string xName = dict["@" + name];

                bla.Add(xName);
            }

The columns should have the name from xName.

How can I do this?

I've tried this:

            foreach (var item in bla)
            {
                DataRow row = table.NewRow();
                row.SetField<string>(item); //this didn't work.

                //foreach (string key in dict.Keys)
                //{
                //    row.SetField<string>(key, item[key]);
                //}
            }

Just want the names from xName as my heading for the output.

Example für xName: Position, Status, Order, Number, ... As my heading. And under that the values.

Answer 1

if i understand you correctly, you've got your list of column names ok, but dont know how to create a datatable with the correct column names.

Below is an example of how to add a column and row to a datatable with a specific column header name.

As discussed in the comments, I've demonstrated a process to get the data you need into a structure that allows you to populate your table.

      //Class to hold data
  public class MyRecordContent
  {
        public MyRecordContent()
        {
            //initialise list
            RecordsColumns = new List<string>();
        }

        //Holds a list of strings for each column of the record.
        //It starts at position 0 to however many columns you have
        public List<string> RecordsColumns { get; set; }
  }

            //This creates an empty table with the columns
            var myTable = new DataTable("Table1");
            foreach (var item in bla)
            {
                if (!myTable.Columns.Contains(item))
                {
                    myTable.Columns.Add(new DataColumn(item, typeof(string)));
                }
            }



         //Here you build up a list of all records and their field content from your xml.
        foreach (var xmlNode in yourXMLRecordCollection)
        {
            var thisRecord = new MyRecordContent();

            foreach (var xmlCol in xmlNode.Elements)//Each column value
            {
                thisRecord.RecordsColumns.Add(xmlCol.GetValue());
            }

            myListOfRecords.Add(thisRecord);
        }

        foreach (MyRecordContent record in myListOfRecords)
        {
            var row = myTable.NewRow();

            //Here we set each row column values in the datatable.
            //Map each rows column value to be the value in the list at same position.
            for (var colPosition = 0; colPosition <= myTable.Columns.Count - 1;) //Number of columns added.
            {
                row[colPosition] = record.RecordsColumns[colPosition];
            }

            myTable.Rows.Add(row);
        }

In the above, itterate through your list of column names and add each column to the table. You may want to add a switch statement to the loop to change the datatype of the column based upon name if required. Then create of new row off that table and set each fields value accordingly. Finally, add the new row to the datatable.

Hope that helps.

Then