C#自定义DataGridView打印功能：适应列宽与分页

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Drawing;
using System.Collections;
using System.Data;
using System.Text;

namespace testPrint
{
    class PrintDGV
    {
        private static StringFormat StrFormat;  // Holds content of a TextBox Cell to write by DrawString
        private static StringFormat StrFormatComboBox; // Holds content of a Boolean Cell to write by DrawImage
        private static Button CellButton;       // Holds the Contents of Button Cell
        private static CheckBox CellCheckBox;   // Holds the Contents of CheckBox Cell 
        private static ComboBox CellComboBox;   // Holds the Contents of ComboBox Cell

        private static int TotalWidth;          // Summation of Columns widths
        private static int RowPos;              // Position of currently printing row 
        private static bool NewPage;            // Indicates if a new page reached
        private static int PageNo;              // Number of pages to print
        private static ArrayList ColumnLefts = new ArrayList();  // Left Coordinate of Columns
        private static ArrayList ColumnWidths = new ArrayList(); // Width of Columns
        private static ArrayList ColumnTypes = new ArrayList();  // DataType of Columns
        private static int CellHeight;          // Height of DataGrid Cell
        private static int RowsPerPage;         // Number of Rows per Page
        private static System.Drawing.Printing.PrintDocument printDoc =
                       new System.Drawing.Printing.PrintDocument();  // PrintDocumnet Object used for printing

        private static string PrintTitle = "";  // Header of pages
        private static DataGridView dgv;        // Holds DataGridView Object to print its contents
        private static List<string> SelectedColumns = new List<string>();   // The Columns Selected by user to print.
        private static List<string> AvailableColumns = new List<string>();  // All Columns avaiable in DataGrid 
        private static bool PrintAllRows = true;   // True = print all rows,  False = print selected rows    
        private static bool FitToPageWidth = true; // True = Fits selected columns to page width ,  False = Print columns as showed    
        private static int HeaderHeight = 0;

        public static void Print_DataGridView(DataGridView dgv1)
        {
            PrintPreviewDialog ppvw;
            try 
            {    
                // Getting DataGridView object to print
                dgv = dgv1;

                // Getting all Coulmns Names in the DataGridView
                AvailableColumns.Clear();
                foreach (DataGridViewColumn c in dgv.Columns)
                {
                    if (!c.Visible) continue;
                    AvailableColumns.Add(c.HeaderText);
                }

                // Showing the PrintOption Form
                PrintOptions dlg = new PrintOptions(AvailableColumns);
                if (dlg.ShowDialog() != DialogResult.OK) return;

                PrintTitle = dlg.PrintTitle;
                PrintAllRows = dlg.PrintAllRows;