using System;
using System.Data;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;
using Microsoft.Office.Core;
using Excel = Microsoft.Office.Interop.Excel;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
private bool isStartPrint = false;

public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
//string OriginalPath = Path.GetDirectoryName(Application.ExecutablePath) + "\\IMS.accdb";
////初始化数据库
//DataBase.OleDbObject.InitDatabase(OriginalPath);
//DataBase.OleDbObject.OpenDb();
//int k=DataBase.OleDbObject.Select("select * from ElementInventory").Rows.Count;

//初始化要写入Excel的数据
DataTable dt = new DataTable();
for (int i = 0; i < 11; i++)
{
DataColumn dc = new DataColumn();
dc.ColumnName = "name" + i;
dc.DataType = typeof(string);
dt.Columns.Add(dc);
}
for (int i = 0; i < 30; i++)
{
DataRow dr = dt.NewRow();
if (i % 2 == 0)
{
dr[0] = "测试用例" + i + "号，开始测试是否自动换行，以及页面高度自适应。";
}
else
{
dr[0] = "测试用例" + i + "号";
}
for (int j = 1; j < 11; j++)
{
dr[j] = j;
}
dt.Rows.Add(dr);
}
if (!isStartPrint)
{
Thread th = new Thread(delegate()
{
DataTabletoExcel(dt, "测试.xlsx");
});
th.Start();
isStartPrint = true;
}
else
{
MessageBox.Show("打印程序已启用，请稍后……", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
//DataTabletoExcel(dt, "测试.xlsx");
}

public void DataTabletoExcel(System.Data.DataTable dtTemp, string strFileName)
{
int rowNum = dtTemp.Rows.Count; //先得到dtTemp的行数
int columnNum = dtTemp.Columns.Count; //列数
Excel.Application ExcelApp = new Excel.Application(); //声明一个应用程序类实例

//ExcelApp.DefaultFilePath = ""; //默认文件路径导出excel的路径还是在参数strFileName里设置
//ExcelApp.DisplayAlerts = true;
//ExcelApp.SheetsInNewWorkbook = 1;///返回或设置 Microsoft Excel 自动插入到新工作簿中的工作表数目。
Excel.Workbook worksBook = ExcelApp.Workbooks.Add(); //创建一个新工作簿
Excel.Worksheet workSheet = (Excel.Worksheet)worksBook.Worksheets[1]; //在工作簿中得到sheet。
if (workSheet == null)
{
System.Diagnostics.Debug.WriteLine("ERROR: worksheet == null");
return;
}
workSheet.Name = "测试Sheet1"; //工作表的名称
workSheet.Cells.WrapText=true; //设置所有列的文本自动换行
workSheet.Cells.EntireRow.AutoFit(); //设置所有列自动调整行高
#region 绘制列
///自定义方法，向sheet中绘制列
RangeMark(workSheet, "A1", "A2", "合并竖列1");
RangeMark(workSheet, "B1", "B2", "合并竖列2");
RangeMark(workSheet, "C1", "C2", "合并竖列3");
RangeMark(workSheet, "D1", "D2", "合并竖列4");
RangeMark(workSheet, "E1", "E2", "合并竖列5");
RangeMark(workSheet, "F1", "H1", "合并横行1");
RangeMark(workSheet, "F2", "F2", "合并横行1.1");
RangeMark(workSheet, "G2", "G2", "合并横行1.2");
RangeMark(workSheet, "H2", "H2", "合并横行1.3");
RangeMark(workSheet, "I1", "K1", "合并横行2");
RangeMark(workSheet, "I2", "J2", "合并横行2.1");
RangeMark(workSheet, "K2", "K2", "合并横行2.2");
#endregion
//将DataTable中的数据导入Excel中
for (int i = 0; i < rowNum; i++)
{
for (int j = 0; j < columnNum; j++)
{
workSheet.Cells[i + 3, j + 1] = dtTemp.Rows[i][j].ToString(); //文本

}
}
///保存路径
string filePath = @"C:\Users\Admin\Desktop\" + strFileName;
if (File.Exists(filePath))
{
try
{
File.Delete(filePath);
}
catch(Exception)
{

}
}
ExcelApp.Visible = true;
//------------------------打印页面相关设置--------------------------------
workSheet.PageSetup.PaperSize = Excel.XlPaperSize.xlPaperA4;//纸张大小
workSheet.PageSetup.Orientation = Excel.XlPageOrientation.xlLandscape;//页面横向
//workSheet.PageSetup.Zoom = 75; //打印时页面设置,缩放比例百分之几
workSheet.PageSetup.Zoom = false; //打印时页面设置,必须设置为false,页高,页宽才有效
workSheet.PageSetup.FitToPagesWide = 1; //设置页面缩放的页宽为1页宽
workSheet.PageSetup.FitToPagesTall = false; //设置页面缩放的页高自动
workSheet.PageSetup.LeftHeader = "成都盛特（Esimtech）";//页面左上边的标志
workSheet.PageSetup.CenterFooter = "第 &P 页，共 &N 页";//页面下标
workSheet.PageSetup.PrintGridlines = true; //打印单元格网线
workSheet.PageSetup.TopMargin = 1.5 / 0.035; //上边距为2cm（转换为in）
workSheet.PageSetup.BottomMargin = 1.5 / 0.035; //下边距为1.5cm
workSheet.PageSetup.LeftMargin = 2 / 0.035; //左边距为2cm
workSheet.PageSetup.RightMargin = 2 / 0.035; //右边距为2cm
workSheet.PageSetup.CenterHorizontally = true; //文字水平居中
//------------------------打印页面设置结束--------------------------------
///http://blog.csdn.net/wanmingtom/article/details/6125599
worksBook.PrintPreview(); //打印预览
//worksBook.PrintOutEx(); //直接打印
//worksBook.Close(); //关闭工作空间
//ExcelApp.Quit(); //退出程序
//workSheet.SaveAs(filePath); //另存表
KillProcess(ExcelApp); //杀掉生成的进程
isStartPrint = false; //打印完毕
GC.Collect(); //垃圾回收机制
}
/// <summary>
/// 引用Windows句柄，获取程序PID
/// </summary>
/// <param name="Hwnd"></param>
/// <param name="PID"></param>
/// <returns></returns>
[DllImport("User32.dll")]
public static extern int GetWindowThreadProcessId(IntPtr Hwnd, out int PID);
/// <summary>
/// 杀掉生成的进程
/// </summary>
/// <param name="AppObject">进程程对象</param>
private static void KillProcess(Excel.Application AppObject)
{
int Pid = 0;
IntPtr Hwnd = new IntPtr(AppObject.Hwnd);
System.Diagnostics.Process p = null;
try
{
GetWindowThreadProcessId(Hwnd, out Pid);
p = System.Diagnostics.Process.GetProcessById(Pid);
if (p != null)
{
p.Kill();
p.Dispose();
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("进程关闭失败！异常信息：" + ex);
}
}

/// <summary>
/// 创建表头单元格，包括合并单元格
/// </summary>
/// <param name="workSheet">工作表</param>
/// <param name="startCell">单元格起始格编号</param>
/// <param name="endCell">单元格结束编号</param>
/// <param name="strText">单元格名称</param>
private static bool RangeMark(Excel.Worksheet workSheet, string startCell, string endCell, string strText)
{
//创建一个区域对象。第一个参数是开始格子号，第二个参数是终止格子号。比如选中A1——D3这个区域。
Excel.Range range = (Excel.Range)workSheet.get_Range(startCell, endCell);
if (range == null)
{
System.Diagnostics.Debug.WriteLine("ERROR: range == null");
return false;
}
range.Merge(0); //合并方法，0的时候直接合并为一个单元格
range.Font.Size = 16; //字体大小
range.Font.Name = "黑体"; //字体
range.WrapText = true; //文本自动换行
range.EntireRow.AutoFit(); //自动调整行高
//range.RowHeight = 20;
//range.EntireColumn.AutoFit(); //自动调整列宽
range.ColumnWidth = 15;
range.HorizontalAlignment = XlVAlign.xlVAlignCenter; //横向居中
range.Value = http://www.mamicode.com/strText; //合并单元格之后，设置其中的文本
range.Interior.ColorIndex = 20; //填充颜色
range.Cells.Borders.LineStyle = 1; //设置单元格边框的粗细

return true;
}
}
}

C#操作excel打印