Procedura: il modo migliore per disegnare una tabella nell'app console (C #)

Ho una domanda interessante. Immagina di avere molti dati che cambiano a intervalli molto rapidi. Voglio visualizzare quei dati come una tabella nell'app console. f.ex:

-------------------------------------------------------------------------
|    Column 1     |    Column 2     |    Column 3     |    Column 4     |
-------------------------------------------------------------------------
|                 |                 |                 |                 |
|                 |                 |                 |                 |
|                 |                 |                 |                 |
-------------------------------------------------------------------------

Come mantenere le cose veloci e come correggere le larghezze delle colonne? So come farlo in java, ma non so come farlo in C #.

Potresti fare qualcosa come il seguente:

static int tableWidth = 73;

static void Main(string[] args)
{
    Console.Clear();
    PrintLine();
    PrintRow("Column 1", "Column 2", "Column 3", "Column 4");
    PrintLine();
    PrintRow("", "", "", "");
    PrintRow("", "", "", "");
    PrintLine();
    Console.ReadLine();
}

static void PrintLine()
{
    Console.WriteLine(new string('-', tableWidth));
}

static void PrintRow(params string[] columns)
{
    int width = (tableWidth - columns.Length) / columns.Length;
    string row = "|";

    foreach (string column in columns)
    {
        row += AlignCentre(column, width) + "|";
    }

    Console.WriteLine(row);
}

static string AlignCentre(string text, int width)
{
    text = text.Length > width ? text.Substring(0, width - 3) + "..." : text;

    if (string.IsNullOrEmpty(text))
    {
        return new string(' ', width);
    }
    else
    {
        return text.PadRight(width - (width - text.Length) / 2).PadLeft(width);
    }
}

Usa String.Format con i valori di allineamento.

Per esempio:

String.Format("|{0,5}|{1,5}|{2,5}|{3,5}|", arg0, arg1, arg2, arg3);

Per creare una riga formattata.

Modifica: grazie a @superlogical, ora puoi trovare e migliorare il seguente codice in GitHub !

Ho scritto questo corso sulla base di alcune idee qui. La larghezza delle colonne è ottimale, e può gestire array di oggetti con questa semplice API:

static void Main(string[] args)
{
  IEnumerable<Tuple<int, string, string>> authors =
    new[]
    {
      Tuple.Create(1, "Isaac", "Asimov"),
      Tuple.Create(2, "Robert", "Heinlein"),
      Tuple.Create(3, "Frank", "Herbert"),
      Tuple.Create(4, "Aldous", "Huxley"),
    };

  Console.WriteLine(authors.ToStringTable(
    new[] {"Id", "First Name", "Surname"},
    a => a.Item1, a => a.Item2, a => a.Item3));

  /* Result:        
  | Id | First Name | Surname  |
  |----------------------------|
  | 1  | Isaac      | Asimov   |
  | 2  | Robert     | Heinlein |
  | 3  | Frank      | Herbert  |
  | 4  | Aldous     | Huxley   |
  */
}

Ecco la classe:

public static class TableParser
{
  public static string ToStringTable<T>(
    this IEnumerable<T> values,
    string[] columnHeaders,
    params Func<T, object>[] valueSelectors)
  {
    return ToStringTable(values.ToArray(), columnHeaders, valueSelectors);
  }

  public static string ToStringTable<T>(
    this T[] values,
    string[] columnHeaders,
    params Func<T, object>[] valueSelectors)
  {
    Debug.Assert(columnHeaders.Length == valueSelectors.Length);

    var arrValues = new string[values.Length + 1, valueSelectors.Length];

    // Fill headers
    for (int colIndex = 0; colIndex < arrValues.GetLength(1); colIndex++)
    {
      arrValues[0, colIndex] = columnHeaders[colIndex];
    }

    // Fill table rows
    for (int rowIndex = 1; rowIndex < arrValues.GetLength(0); rowIndex++)
    {
      for (int colIndex = 0; colIndex < arrValues.GetLength(1); colIndex++)
      {
        arrValues[rowIndex, colIndex] = valueSelectors[colIndex]
          .Invoke(values[rowIndex - 1]).ToString();
      }
    }

    return ToStringTable(arrValues);
  }

  public static string ToStringTable(this string[,] arrValues)
  {
    int[] maxColumnsWidth = GetMaxColumnsWidth(arrValues);
    var headerSpliter = new string('-', maxColumnsWidth.Sum(i => i + 3) - 1);

    var sb = new StringBuilder();
    for (int rowIndex = 0; rowIndex < arrValues.GetLength(0); rowIndex++)
    {
      for (int colIndex = 0; colIndex < arrValues.GetLength(1); colIndex++)
      {
        // Print cell
        string cell = arrValues[rowIndex, colIndex];
        cell = cell.PadRight(maxColumnsWidth[colIndex]);
        sb.Append(" | ");
        sb.Append(cell);
      }

      // Print end of line
      sb.Append(" | ");
      sb.AppendLine();

      // Print splitter
      if (rowIndex == 0)
      {
        sb.AppendFormat(" |{0}| ", headerSpliter);
        sb.AppendLine();
      }
    }

    return sb.ToString();
  }

  private static int[] GetMaxColumnsWidth(string[,] arrValues)
  {
    var maxColumnsWidth = new int[arrValues.GetLength(1)];
    for (int colIndex = 0; colIndex < arrValues.GetLength(1); colIndex++)
    {
      for (int rowIndex = 0; rowIndex < arrValues.GetLength(0); rowIndex++)
      {
        int newLength = arrValues[rowIndex, colIndex].Length;
        int oldLength = maxColumnsWidth[colIndex];

        if (newLength > oldLength)
        {
          maxColumnsWidth[colIndex] = newLength;
        }
      }
    }

    return maxColumnsWidth;
  }
}

Modifica: ho aggiunto un piccolo miglioramento: se vuoi che le intestazioni delle colonne siano il nome della proprietà, aggiungi il seguente metodo a TableParser(nota che sarà un po 'più lento a causa della riflessione):

public static string ToStringTable<T>(
    this IEnumerable<T> values,
    params Expression<Func<T, object>>[] valueSelectors)
{
  var headers = valueSelectors.Select(func => GetProperty(func).Name).ToArray();
  var selectors = valueSelectors.Select(exp => exp.Compile()).ToArray();
  return ToStringTable(values, headers, selectors);
}

private static PropertyInfo GetProperty<T>(Expression<Func<T, object>> expresstion)
{
  if (expresstion.Body is UnaryExpression)
  {
    if ((expresstion.Body as UnaryExpression).Operand is MemberExpression)
    {
      return ((expresstion.Body as UnaryExpression).Operand as MemberExpression).Member as PropertyInfo;
    }
  }

  if ((expresstion.Body is MemberExpression))
  {
    return (expresstion.Body as MemberExpression).Member as PropertyInfo;
  }
  return null;
}

Esistono diverse librerie open source che consentono la formattazione della tabella della console, che vanno da semplici (come gli esempi di codice nelle risposte qui) a più avanzate.

ConsoleTable

A giudicare dalle statistiche di NuGet, la libreria più popolare per la formattazione delle tabelle è ConsoleTable . Le tabelle sono costruite in questo modo (dal file readme):

var table = new ConsoleTable("one", "two", "three");
table.AddRow(1, 2, 3)
     .AddRow("this line should be longer", "yes it is", "oh");

Le tabelle possono essere formattate utilizzando uno degli stili predefiniti. Sarà simile a questo:

--------------------------------------------------
| one                        | two       | three |
--------------------------------------------------
| 1                          | 2         | 3     |
--------------------------------------------------
| this line should be longer | yes it is | oh    |
--------------------------------------------------

Questa libreria prevede celle a riga singola senza formattazione.

Ci sono un paio di librerie basate su ConsoleTable con set di funzionalità leggermente estesi, come più stili di linea.

CsConsoleFormat

Se hai bisogno di una formattazione più complessa, puoi usare CsConsoleFormat . † Ecco una tabella generata da un elenco di processi (da un progetto di esempio):

new Grid { Stroke = StrokeHeader, StrokeColor = DarkGray }
    .AddColumns(
        new Column { Width = GridLength.Auto },
        new Column { Width = GridLength.Auto, MaxWidth = 20 },
        new Column { Width = GridLength.Star(1) },
        new Column { Width = GridLength.Auto }
    )
    .AddChildren(
        new Cell { Stroke = StrokeHeader, Color = White }
            .AddChildren("Id"),
        new Cell { Stroke = StrokeHeader, Color = White }
            .AddChildren("Name"),
        new Cell { Stroke = StrokeHeader, Color = White }
            .AddChildren("Main Window Title"),
        new Cell { Stroke = StrokeHeader, Color = White }
            .AddChildren("Private Memory"),
        processes.Select(process => new[] {
            new Cell { Stroke = StrokeRight }
                .AddChildren(process.Id),
            new Cell { Stroke = StrokeRight, Color = Yellow, TextWrap = TextWrapping.NoWrap }
                .AddChildren(process.ProcessName),
            new Cell { Stroke = StrokeRight, Color = White, TextWrap = TextWrapping.NoWrap }
                .AddChildren(process.MainWindowTitle),
            new Cell { Stroke = LineThickness.None, Align = HorizontalAlignment.Right }
                .AddChildren(process.PrivateMemorySize64.ToString("n0")),
        })
    )

Il risultato finale sarà simile a questo:

Supporta qualsiasi tipo di riga di tabella (diverse incluse e personalizzabili), celle multilinea con ritorno a capo automatico, colori, colonne che crescono in base al contenuto o alla percentuale, allineamento del testo ecc.

_{† CsConsoleFormat è stato sviluppato da me.}

class ArrayPrinter
    {
    #region Declarations

    static bool isLeftAligned = false;
    const string cellLeftTop = "┌";
    const string cellRightTop = "┐";
    const string cellLeftBottom = "└";
    const string cellRightBottom = "┘";
    const string cellHorizontalJointTop = "┬";
    const string cellHorizontalJointbottom = "┴";
    const string cellVerticalJointLeft = "├";
    const string cellTJoint = "┼";
    const string cellVerticalJointRight = "┤";
    const string cellHorizontalLine = "─";
    const string cellVerticalLine = "│";

    #endregion

    #region Private Methods

    private static int GetMaxCellWidth(string[,] arrValues)
    {
        int maxWidth = 1;

        for (int i = 0; i < arrValues.GetLength(0); i++)
        {
            for (int j = 0; j < arrValues.GetLength(1); j++)
            {
                int length = arrValues[i, j].Length;
                if (length > maxWidth)
                {
                    maxWidth = length;
                }
            }
        }

        return maxWidth;
    }

    private static string GetDataInTableFormat(string[,] arrValues)
    {
        string formattedString = string.Empty;

        if (arrValues == null)
            return formattedString;

        int dimension1Length = arrValues.GetLength(0);
        int dimension2Length = arrValues.GetLength(1);

        int maxCellWidth = GetMaxCellWidth(arrValues);
        int indentLength = (dimension2Length * maxCellWidth) + (dimension2Length - 1);
        //printing top line;
        formattedString = string.Format("{0}{1}{2}{3}", cellLeftTop, Indent(indentLength), cellRightTop, System.Environment.NewLine);

        for (int i = 0; i < dimension1Length; i++)
        {
            string lineWithValues = cellVerticalLine;
            string line = cellVerticalJointLeft;
            for (int j = 0; j < dimension2Length; j++)
            {
                string value = (isLeftAligned) ? arrValues[i, j].PadRight(maxCellWidth, ' ') : arrValues[i, j].PadLeft(maxCellWidth, ' ');
                lineWithValues += string.Format("{0}{1}", value, cellVerticalLine);
                line += Indent(maxCellWidth);
                if (j < (dimension2Length - 1))
                {
                    line += cellTJoint;
                }
            }
            line += cellVerticalJointRight;
            formattedString += string.Format("{0}{1}", lineWithValues, System.Environment.NewLine);
            if (i < (dimension1Length - 1))
            {
                formattedString += string.Format("{0}{1}", line, System.Environment.NewLine);
            }
        }

        //printing bottom line
        formattedString += string.Format("{0}{1}{2}{3}", cellLeftBottom, Indent(indentLength), cellRightBottom, System.Environment.NewLine);
        return formattedString;
    }

    private static string Indent(int count)
    {
        return string.Empty.PadLeft(count, '─');                 
    }

    #endregion

    #region Public Methods

    public static void PrintToStream(string[,] arrValues, StreamWriter writer)
    {
        if (arrValues == null)
            return;

        if (writer == null)
            return;

        writer.Write(GetDataInTableFormat(arrValues));
    }

    public static void PrintToConsole(string[,] arrValues)
    {
        if (arrValues == null)
            return;

        Console.WriteLine(GetDataInTableFormat(arrValues));
    }

    #endregion

    static void Main(string[] args)
    {           
        int value = 997;
        string[,] arrValues = new string[5, 5];
        for (int i = 0; i < arrValues.GetLength(0); i++)
        {
            for (int j = 0; j < arrValues.GetLength(1); j++)
            {
                value++;
                arrValues[i, j] = value.ToString();
            }
        }
        ArrayPrinter.PrintToConsole(arrValues);
        Console.ReadLine();
    }
}

Volevo colonne a larghezza variabile e non mi interessavano particolarmente i caratteri della casella. Inoltre, avevo bisogno di stampare alcune informazioni extra per ogni riga.

Quindi, nel caso in cui qualcun altro ne abbia bisogno, ti farò risparmiare qualche minuto:

public class TestTableBuilder
{

    public interface ITextRow
    {
        String Output();
        void Output(StringBuilder sb);
        Object Tag { get; set; }
    }

    public class TableBuilder : IEnumerable<ITextRow>
    {
        protected class TextRow : List<String>, ITextRow
        {
            protected TableBuilder owner = null;
            public TextRow(TableBuilder Owner)
            {
                owner = Owner;
                if (owner == null) throw new ArgumentException("Owner");
            }
            public String Output()
            {
                StringBuilder sb = new StringBuilder();
                Output(sb);
                return sb.ToString();
            }
            public void Output(StringBuilder sb)
            {
                sb.AppendFormat(owner.FormatString, this.ToArray());
            }
            public Object Tag { get; set; }
        }

        public String Separator { get; set; }

        protected List<ITextRow> rows = new List<ITextRow>();
        protected List<int> colLength = new List<int>();

        public TableBuilder()
        {
            Separator = "  ";
        }

        public TableBuilder(String separator)
            : this()
        {
            Separator = separator;
        }

        public ITextRow AddRow(params object[] cols)
        {
            TextRow row = new TextRow(this);
            foreach (object o in cols)
            {
                String str = o.ToString().Trim();
                row.Add(str);
                if (colLength.Count >= row.Count)
                {
                    int curLength = colLength[row.Count - 1];
                    if (str.Length > curLength) colLength[row.Count - 1] = str.Length;
                }
                else
                {
                    colLength.Add(str.Length);
                }
            }
            rows.Add(row);
            return row;
        }

        protected String _fmtString = null;
        public String FormatString
        {
            get
            {
                if (_fmtString == null)
                {
                    String format = "";
                    int i = 0;
                    foreach (int len in colLength)
                    {
                        format += String.Format("{{{0},-{1}}}{2}", i++, len, Separator);
                    }
                    format += "\r\n";
                    _fmtString = format;
                }
                return _fmtString;
            }
        }

        public String Output()
        {
            StringBuilder sb = new StringBuilder();
            foreach (TextRow row in rows)
            {
                row.Output(sb);
            }
            return sb.ToString();
        }

        #region IEnumerable Members

        public IEnumerator<ITextRow> GetEnumerator()
        {
            return rows.GetEnumerator();
        }

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            return rows.GetEnumerator();
        }

        #endregion
    }



    static void Main(String[] args)
    {
        TableBuilder tb = new TableBuilder();
        tb.AddRow("When", "ID", "Name");
        tb.AddRow("----", "--", "----");

        tb.AddRow(DateTime.Now, "1", "Name1");
        tb.AddRow(DateTime.Now, "1", "Name2");

        Console.Write(tb.Output());
        Console.WriteLine();

        // or

        StringBuilder sb = new StringBuilder();
        int i = 0;
        foreach (ITextRow tr in tb)
        {
            tr.Output(sb);
            if (i++ > 1) sb.AppendLine("more stuff per line");
        }
        Console.Write(sb.ToString());
    }
}

Produzione:

Quando ID nome
---- - ----
2/4/2013 8:37:44 PM 1 Nome1
2/4/2013 8:37:44 PM 1 Nome2

Quando ID nome
---- - ----
2/4/2013 8:37:44 PM 1 Nome1
più cose per riga
2/4/2013 8:37:44 PM 1 Nome2
più cose per riga

Questo è un miglioramento rispetto a una risposta precedente. Aggiunge il supporto per valori con lunghezze variabili e righe con un numero variabile di celle. Per esempio:

┌──────────┬─────────┬──────────────────────────┬────────────────┬─────┬───────┐
│Identifier│     Type│               Description│  CPU Credit Use│Hours│Balance│
├──────────┼─────────┼──────────────────────────┼────────────────┼─────┼───────┘
│ i-1234154│ t2.small│       This is an example.│         3263.75│  360│
├──────────┼─────────┼──────────────────────────┼────────────────┼─────┘
│ i-1231412│ t2.small│  This is another example.│         3089.93│
└──────────┴─────────┴──────────────────────────┴────────────────┘

Ecco il codice:

public class ArrayPrinter
{
    const string TOP_LEFT_JOINT = "┌";
    const string TOP_RIGHT_JOINT = "┐";
    const string BOTTOM_LEFT_JOINT = "└";
    const string BOTTOM_RIGHT_JOINT = "┘";
    const string TOP_JOINT = "┬";
    const string BOTTOM_JOINT = "┴";
    const string LEFT_JOINT = "├";
    const string JOINT = "┼";
    const string RIGHT_JOINT = "┤";
    const char HORIZONTAL_LINE = '─';
    const char PADDING = ' ';
    const string VERTICAL_LINE = "│";

    private static int[] GetMaxCellWidths(List<string[]> table)
    {
        int maximumCells = 0;
        foreach (Array row in table)
        {
            if (row.Length > maximumCells)
                maximumCells = row.Length;
        }

        int[] maximumCellWidths = new int[maximumCells];
        for (int i = 0; i < maximumCellWidths.Length; i++)
            maximumCellWidths[i] = 0;

        foreach (Array row in table)
        {
            for (int i = 0; i < row.Length; i++)
            {
                if (row.GetValue(i).ToString().Length > maximumCellWidths[i])
                    maximumCellWidths[i] = row.GetValue(i).ToString().Length;
            }
        }

        return maximumCellWidths;
    }

    public static string GetDataInTableFormat(List<string[]> table)
    {
        StringBuilder formattedTable = new StringBuilder();
        Array nextRow = table.FirstOrDefault();
        Array previousRow = table.FirstOrDefault();

        if (table == null || nextRow == null)
            return String.Empty;

        // FIRST LINE:
        int[] maximumCellWidths = GetMaxCellWidths(table);
        for (int i = 0; i < nextRow.Length; i++)
        {
            if (i == 0 && i == nextRow.Length - 1)
                formattedTable.Append(String.Format("{0}{1}{2}", TOP_LEFT_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE), TOP_RIGHT_JOINT));
            else if (i == 0)
                formattedTable.Append(String.Format("{0}{1}", TOP_LEFT_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE)));
            else if (i == nextRow.Length - 1)
                formattedTable.AppendLine(String.Format("{0}{1}{2}", TOP_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE), TOP_RIGHT_JOINT));
            else
                formattedTable.Append(String.Format("{0}{1}", TOP_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE)));
        }

        int rowIndex = 0;
        int lastRowIndex = table.Count - 1;
        foreach (Array thisRow in table)
        {
            // LINE WITH VALUES:
            int cellIndex = 0;
            int lastCellIndex = thisRow.Length - 1;
            foreach (object thisCell in thisRow)
            {
                string thisValue = thisCell.ToString().PadLeft(maximumCellWidths[cellIndex], PADDING);

                if (cellIndex == 0 && cellIndex == lastCellIndex)
                    formattedTable.AppendLine(String.Format("{0}{1}{2}", VERTICAL_LINE, thisValue, VERTICAL_LINE));
                else if (cellIndex == 0)
                    formattedTable.Append(String.Format("{0}{1}", VERTICAL_LINE, thisValue));
                else if (cellIndex == lastCellIndex)
                    formattedTable.AppendLine(String.Format("{0}{1}{2}", VERTICAL_LINE, thisValue, VERTICAL_LINE));
                else
                    formattedTable.Append(String.Format("{0}{1}", VERTICAL_LINE, thisValue));

                cellIndex++;
            }

            previousRow = thisRow;

            // SEPARATING LINE:
            if (rowIndex != lastRowIndex)
            {
                nextRow = table[rowIndex + 1];

                int maximumCells = Math.Max(previousRow.Length, nextRow.Length);
                for (int i = 0; i < maximumCells; i++)
                {
                    if (i == 0 && i == maximumCells - 1)
                    {
                        formattedTable.Append(String.Format("{0}{1}{2}", LEFT_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE), RIGHT_JOINT));
                    }
                    else if (i == 0)
                    {
                        formattedTable.Append(String.Format("{0}{1}", LEFT_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE)));
                    }
                    else if (i == maximumCells - 1)
                    {
                        if (i > previousRow.Length)
                            formattedTable.AppendLine(String.Format("{0}{1}{2}", TOP_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE), TOP_RIGHT_JOINT));
                        else if (i > nextRow.Length)
                            formattedTable.AppendLine(String.Format("{0}{1}{2}", BOTTOM_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE), BOTTOM_RIGHT_JOINT));
                        else if (i > previousRow.Length - 1)
                            formattedTable.AppendLine(String.Format("{0}{1}{2}", JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE), TOP_RIGHT_JOINT));
                        else if (i > nextRow.Length - 1)
                            formattedTable.AppendLine(String.Format("{0}{1}{2}", JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE), BOTTOM_RIGHT_JOINT));
                        else
                            formattedTable.AppendLine(String.Format("{0}{1}{2}", JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE), RIGHT_JOINT));
                    }
                    else
                    {
                        if (i > previousRow.Length)
                            formattedTable.Append(String.Format("{0}{1}", TOP_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE)));
                        else if (i > nextRow.Length)
                            formattedTable.Append(String.Format("{0}{1}", BOTTOM_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE)));
                        else
                            formattedTable.Append(String.Format("{0}{1}", JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE)));
                    }
                }
            }

            rowIndex++;
        }

        // LAST LINE:
        for (int i = 0; i < previousRow.Length; i++)
        {
            if (i == 0)
                formattedTable.Append(String.Format("{0}{1}", BOTTOM_LEFT_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE)));
            else if (i == previousRow.Length - 1)
                formattedTable.AppendLine(String.Format("{0}{1}{2}", BOTTOM_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE), BOTTOM_RIGHT_JOINT));
            else
                formattedTable.Append(String.Format("{0}{1}", BOTTOM_JOINT, String.Empty.PadLeft(maximumCellWidths[i], HORIZONTAL_LINE)));
        }

        return formattedTable.ToString();
    }
}

Ho un progetto su GitHub che puoi usare

https://github.com/BrunoVT1992/ConsoleTable

Puoi usarlo in questo modo:

var table = new Table();

table.SetHeaders("Name", "Date", "Number");

for (int i = 0; i <= 10; i++)
{
    if (i % 2 == 0)
        table.AddRow($"name {i}", DateTime.Now.AddDays(-i).ToLongDateString(), i.ToString());
    else
        table.AddRow($"long name {i}", DateTime.Now.AddDays(-i).ToLongDateString(), (i * 5000).ToString());
}

Console.WriteLine(table.ToString());

Darà questo risultato:

Usa la libreria MarkDownLog (puoi trovarla su NuGet)

puoi semplicemente usare l'estensione ToMarkdownTable () a qualsiasi raccolta, fa tutta la formattazione per te.

 Console.WriteLine(
    yourCollection.Select(s => new
                    {
                        column1 = s.col1,
                        column2 = s.col2,
                        column3 = s.col3,
                        StaticColumn = "X"
                    })
                    .ToMarkdownTable());

L'output è simile a questo:

Column1  | Column2   | Column3   | StaticColumn   
--------:| ---------:| ---------:| --------------
         |           |           | X              

Nel caso in cui questo aiuti qualcuno, questa è una semplice lezione che ho scritto per le mie necessità. Puoi cambiarlo facilmente per adattarlo alle tue esigenze.

using System.Collections.Generic;
using System.Linq;

namespace Utilities
{
    public class TablePrinter
    {
        private readonly string[] titles;
        private readonly List<int> lengths;
        private readonly List<string[]> rows = new List<string[]>();

        public TablePrinter(params string[] titles)
        {
            this.titles = titles;
            lengths = titles.Select(t => t.Length).ToList();
        }

        public void AddRow(params object[] row)
        {
            if (row.Length != titles.Length)
            {
                throw new System.Exception($"Added row length [{row.Length}] is not equal to title row length [{titles.Length}]");
            }
            rows.Add(row.Select(o => o.ToString()).ToArray());
            for (int i = 0; i < titles.Length; i++)
            {
                if (rows.Last()[i].Length > lengths[i])
                {
                    lengths[i] = rows.Last()[i].Length;
                }
            }
        }

        public void Print()
        {
            lengths.ForEach(l => System.Console.Write("+-" + new string('-', l) + '-'));
            System.Console.WriteLine("+");

            string line = "";
            for (int i = 0; i < titles.Length; i++)
            {
                line += "| " + titles[i].PadRight(lengths[i]) + ' ';
            }
            System.Console.WriteLine(line + "|");

            lengths.ForEach(l => System.Console.Write("+-" + new string('-', l) + '-'));
            System.Console.WriteLine("+");

            foreach (var row in rows)
            {
                line = "";
                for (int i = 0; i < row.Length; i++)
                {
                    if (int.TryParse(row[i], out int n))
                    {
                        line += "| " + row[i].PadLeft(lengths[i]) + ' ';  // numbers are padded to the left
                    }
                    else
                    {
                        line += "| " + row[i].PadRight(lengths[i]) + ' ';
                    }
                }
                System.Console.WriteLine(line + "|");
            }

            lengths.ForEach(l => System.Console.Write("+-" + new string('-', l) + '-'));
            System.Console.WriteLine("+");
        }
    }
}

Utilizzo del campione:

var t = new TablePrinter("id", "Column A", "Column B");
t.AddRow(1, "Val A1", "Val B1");
t.AddRow(2, "Val A2", "Val B2");
t.AddRow(100, "Val A100", "Val B100");
t.Print();

Produzione:

+-----+----------+----------+
| id  | Column A | Column B |
+-----+----------+----------+
|   1 | Val A1   | Val B1   |
|   2 | Val A2   | Val B2   |
| 100 | Val A100 | Val B100 |
+-----+----------+----------+

public static void ToPrintConsole(this DataTable dataTable)
    {
        // Print top line
        Console.WriteLine(new string('-', 75));

        // Print col headers
        var colHeaders = dataTable.Columns.Cast<DataColumn>().Select(arg => arg.ColumnName);
        foreach (String s in colHeaders)
        {
            Console.Write("| {0,-20}", s);
        }
        Console.WriteLine();

        // Print line below col headers
        Console.WriteLine(new string('-', 75));

        // Print rows
        foreach (DataRow row in dataTable.Rows)
        {
            foreach (Object o in row.ItemArray)
            {
                Console.Write("| {0,-20}", o.ToString());
            }
            Console.WriteLine();
        }

        // Print bottom line
        Console.WriteLine(new string('-', 75));
    }

È più facile in VisualBasic.net!

Se desideri che l'utente possa inserire manualmente i dati in una tabella:

Console.Write("Enter Data For Column 1: ")
    Dim Data1 As String = Console.ReadLine
    Console.Write("Enter Data For Column 2: ")
    Dim Data2 As String = Console.ReadLine

    Console.WriteLine("{0,-20} {1,-10} {2,-10}", "{Data Type}", "{Column 1}", "{Column 2}")
    Console.WriteLine("{0,-20} {1,-10} {2,-10}", "Data Entered:", Data1, Data2)

    Console.WriteLine("ENTER To Exit: ")
    Console.ReadLine()

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