Tuesday 23 August 2016



Convert HTML Tables to DataSet in C#

 

private DataSet ConvertHTMLTablesToDataSet(string HTML)
{
// Declarations
DataSet ds = new DataSet();
DataTable dt = null;
DataRow dr = null;
DataColumn dc = null;
string TableExpression = "<TABLE[^>]*>(.*?)</TABLE>";
string HeaderExpression = "<TH[^>]*>(.*?)</TH>";
string RowExpression = "<TR[^>]*>(.*?)</TR>";
string ColumnExpression = "<TD[^>]*>(.*?)</TD>";
bool HeadersExist = false;
int iCurrentColumn = 0;
int iCurrentRow = 0;
// Get a match for all the tables in the HTML
MatchCollection Tables = Regex.Matches(HTML, TableExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase);
// Loop through each table element
foreach (Match Table in Tables)
{
// Reset the current row counter and the header flag
iCurrentRow = 0;
HeadersExist = false;
// Add a new table to the DataSet
dt = new DataTable();
//Create the relevant amount of columns for this table (use the headers if they exist, otherwise use default names)
// if (Table.Value.Contains("<th"))
if (Table.Value.Contains("<TH"))
{
// Set the HeadersExist flag
HeadersExist = true;
// Get a match for all the rows in the table
MatchCollection Headers = Regex.Matches(Table.Value, HeaderExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase);
// Loop through each header element
foreach (Match Header in Headers)
{
dt.Columns.Add(Header.Groups[1].ToString());
}
}
else
{
for (int iColumns = 1; iColumns <= Regex.Matches(Regex.Matches(Regex.Matches(Table.Value, TableExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase)[0].ToString(), RowExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase)[0].ToString(), ColumnExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase).Count; iColumns++)
{
dt.Columns.Add("Column " + iColumns);
}
}
//Get a match for all the rows in the table
MatchCollection Rows = Regex.Matches(Table.Value, RowExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase);
// Loop through each row element
foreach (Match Row in Rows)
{
// Only loop through the row if it isn't a header row
if (!(iCurrentRow == 0 && HeadersExist))
{
// Create a new row and reset the current column counter
dr = dt.NewRow();
iCurrentColumn = 0;
// Get a match for all the columns in the row
MatchCollection Columns = Regex.Matches(Row.Value, ColumnExpression, RegexOptions.Multiline | RegexOptions.Singleline | RegexOptions.IgnoreCase);
// Loop through each column element
foreach (Match Column in Columns)
{
// Add the value to the DataRow
dr[iCurrentColumn] = Column.Groups[1].ToString();
// Increase the current column
iCurrentColumn++;
}
// Add the DataRow to the DataTable
dt.Rows.Add(dr);
}
// Increase the current row counter
iCurrentRow++;
}
// Add the DataTable to the DataSet
ds.Tables.Add(dt);
}
return ds;
}

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