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Fix DataFrame ToString() method to use correct alignment for columns to produce readable output #6673

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merged 1 commit into from
May 11, 2023
Merged

Fix DataFrame ToString() method to use correct alignment for columns to produce readable output #6673

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8 changes: 5 additions & 3 deletions src/Microsoft.Data.Analysis/DataFrame.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -671,18 +671,20 @@ public override string ToString()
{
longestColumnName = Math.Max(longestColumnName, Columns[i].Name.Length);
}

int padding = Math.Max(10, longestColumnName + 1);
for (int i = 0; i < Columns.Count; i++)
{
// Left align by 10
sb.Append(string.Format(Columns[i].Name.PadRight(longestColumnName)));
// Left align by 10 or more (in case of longer column names)
sb.Append(string.Format(Columns[i].Name.PadRight(padding)));
}
sb.AppendLine();
long numberOfRows = Math.Min(Rows.Count, 25);
for (int i = 0; i < numberOfRows; i++)
{
foreach (object obj in Rows[i])
{
sb.Append((obj ?? "null").ToString().PadRight(longestColumnName));
sb.Append((obj ?? "null").ToString().PadRight(padding));
}
sb.AppendLine();
}
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