How to convert Dictionary<string, List<object>> into DataTable in C#?

Question

I have a Dictionary<string, AFValues> which AFValues is a collection of type AFValue object.

A snapshot of what is behind the scene of the dictionary data structure:

The Value for each Key has this AFValues collection:

Then, this is what I have written so far to convert the dictionary into a data table.

private DataTable dataTable = null;    
private DataTable ConvertToDataTable(Dictionary<string, AFValues> dict)
        {
            using (dataTable = new DataTable())
            {
                if (dict.Count > 0)
                {
                    var headers = dict.Keys;
                    foreach (var colHeader in headers)
                    {
                        dataTable.Columns.Add(colHeader);
                    }

                    foreach (var row in dict)
                    {
                        DataRow dataRow = dataTable.NewRow();
                        foreach (var afVal in row.Value)
                        {
                            dataRow[row.Key] = afVal.Value;
                        }
                        dataTable.Rows.Add(dataRow);
                    }
                }
            }
            return dataTable;
        }

I have successfully created the DataTable columns based on the dict.Keys which is fairly straightforward. However, my problem lies on how to correctly loop through AFValues and mapped each AFValue to their corresponding column ( dict.Key )?

I have done my research, but couldn't find any related scenario which is the same as mine.

This is the returned DataTable based on the code above which is incorrect.

This should be the expected output (sample table)

Any help is greatly appreciated.

Answer 1

You can use a code block like this for your inner loop:

for (int i = 0; i < dict.Values.Max(item => item.Count()); i++)
{
    DataRow dataRow = dataTable.NewRow();

    foreach (var key in dict.Keys)
    {
        if (dict[key].Count > i)
            dataRow[key] = dict[key][i];
    }
    dataTable.Rows.Add(dataRow);
}