Print Contents Of A DataTable

Question

Currently I have code which looks up a database table through a SQL connection and inserts the top five rows into a Datatable (Table).

using(SqlCommand _cmd          


        

Answer 1

Building on another answer here, here's a method that converts a DataTable to CSV output and adds the column names as the first row in the output:

public static string DataTableToCsv(DataTable table)
{
    string result = string.Empty;
    StringBuilder resultBuilder = new StringBuilder();

    if (table != null && table.Rows != null && table.Columns != null && table.Columns.Count > 0)
    {
        int lastItemIndex = table.Columns.Count - 1;
        int index = 0;

        foreach (DataColumn column in table.Columns)
        {
            resultBuilder.Append(column.ColumnName);

            if (index < lastItemIndex)       // if not the last element in the row
                resultBuilder.Append(", ");  // add the separator

            index++;
        }

        resultBuilder.AppendLine();  // add a CRLF after column names row

        foreach (DataRow dataRow in table.Rows)
        {
            lastItemIndex = dataRow.ItemArray.Length - 1;
            index = 0;

            foreach (object item in dataRow.ItemArray)
            {
                resultBuilder.Append(item);

                if (index < lastItemIndex)       // if not the last element in the row
                    resultBuilder.Append(", ");  // add the separator

                index++;
            }

            resultBuilder.AppendLine();  // add a CRLF after each data row
        }

        result = resultBuilder.ToString();
    }

    return result;
}

Usage example:

DataTable table = new DataTable();
....
Console.WriteLine(DataTableToCsv(table));

Note that this method does not properly handle (i.e., escape) data that contains quotes or commas. But it should be sufficient as a quick and dirty way to dump a data table to the console or anywhere else for viewing.

Answer 2

Print Datatable contents rows with column

Here is solution 

DataTable datatableinfo= new DataTable();

// Fill data table 

//datatableinfo=fill by function or get data from database

//Print data table with rows and column


for (int j = 0; j < datatableinfo.Rows.Count; j++)
{
    for (int i = 0; i < datatableinfo.Columns.Count; i++)    
        {    
            Console.Write(datatableinfo.Columns[i].ColumnName + " ");    
            Console.WriteLine(datatableinfo.Rows[j].ItemArray[i]); 
        }
}


Ouput :
ColumnName - row Value
ColumnName - row Value
ColumnName - row Value
ColumnName - row Value

Answer 3

you can try this code :

foreach(DataRow dataRow in Table.Rows)
{
    foreach(var item in dataRow.ItemArray)
    {
        Console.WriteLine(item);
    }
}

Update 1

DataTable Table = new DataTable("TestTable");
using(SqlCommand _cmd = new SqlCommand(queryStatement, _con))
{
    SqlDataAdapter _dap = new SqlDataAdapter(_cmd);
    _con.Open();
    _dap.Fill(Table);
    _con.Close();

}
Console.WriteLine(Table.Rows.Count);
foreach(DataRow dataRow in Table.Rows)
{
    foreach(var item in dataRow.ItemArray)
    {
        Console.WriteLine(item);
    }
}

Answer 4

Use the following extension method.

public static string ToCSV(this DataTable t, bool header)
{
    StringBuilder sb = new StringBuilder();
    int i = 0;
    int maxColIdx = 0;
    
    if (t?.Columns?.Count > 0)
    {
        maxColIdx = t.Columns.Count - 1;
        if (header)
        {
            foreach (DataColumn c in t.Columns)
            {
                sb.Append(c.ColumnName);
                if (i < maxColIdx) sb.Append(", ");
                i++;
            }
            sb.AppendLine();
        }

        if (t?.Rows?.Count > 0)
        {
            foreach (DataRow r in t.Rows)
            {
                i = 0;
                foreach (var item in r.ItemArray)
                {
                    sb.Append(item);
                    if( i < maxColIdx) sb.Append(',');
                    i++;
                }
                sb.AppendLine();
            }
        }
    }           
    return sb.ToString();
}

Answer 5

Proper Tabular display

static void print_results(DataTable data)
    {
        Console.WriteLine();
        Dictionary<string, int> colWidths = new Dictionary<string, int>();

        foreach (DataColumn col in data.Columns)
        {
            Console.Write(col.ColumnName);
            var maxLabelSize = data.Rows.OfType<DataRow>()
                    .Select(m => (m.Field<object>(col.ColumnName)?.ToString() ?? "").Length)
                    .OrderByDescending(m => m).FirstOrDefault();

            colWidths.Add(col.ColumnName, maxLabelSize);
            for (int i = 0; i < maxLabelSize - col.ColumnName.Length + 10; i++) Console.Write(" ");
        }

        Console.WriteLine();

        foreach (DataRow dataRow in data.Rows)
        {
            for (int j = 0; j < dataRow.ItemArray.Length; j++)
            {
                Console.Write(dataRow.ItemArray[j]);
                for (int i = 0; i < colWidths[data.Columns[j].ColumnName] - dataRow.ItemArray[j].ToString().Length + 10; i++) Console.Write(" ");
            }
            Console.WriteLine();
        }
    }

Answer 6

Here is another solution which dumps the table to a comma separated string:

using System.Data;

public static string DumpDataTable(DataTable table)
        {
            string data = string.Empty;
            StringBuilder sb = new StringBuilder();

            if (null != table && null != table.Rows)
            {
                foreach (DataRow dataRow in table.Rows)
                {
                    foreach (var item in dataRow.ItemArray)
                    {
                        sb.Append(item);
                        sb.Append(',');
                    }
                    sb.AppendLine();
                }

                data = sb.ToString();
            }
            return data;
        }