datatable 转excel

public static void ExportToExcel(System.Data.DataTable dt)
{
if (dt == null) return;
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
if (xlApp == null)
{
MessageBox.Show("无法创建Excel对象，可能您的电脑未安装Excel");
return;
}

System.Windows.Forms.SaveFileDialog saveDia = new SaveFileDialog();
saveDia.Filter = "Excel|*.xls";
saveDia.Title = "导出为Excel文件";

if (saveDia.ShowDialog() == System.Windows.Forms.DialogResult.OK
&& !string.Empty.Equals(saveDia.FileName))
{
Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
Microsoft.Office.Interop.Excel.Range range = null;

long totalCount = dt.Rows.Count;
long rowRead = 0;
float percent = 0;
string fileName = saveDia.FileName;

//写入标题
for (int i = 0; i < dt.Columns.Count; i++)
{
worksheet.Cells[1, i + 1] = dt.Columns[i].ColumnName;
range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, i + 1];
//range.Interior.ColorIndex = 15;//背景颜色
range.Font.Bold = true;//粗体
range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;//居中
//加边框
range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null);

//range.ColumnWidth = 4.63;//设置列宽
//range.EntireColumn.AutoFit();//自动调整列宽
//r1.EntireRow.AutoFit();//自动调整行高
}

//写入内容

for (int r = 0; r < dt.DefaultView.Count; r++)
{
for (int i = 0; i < dt.Columns.Count; i++)
{
worksheet.Cells[r + 2, i + 1] = dt.DefaultView[r][i];
range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[r + 2, i + 1];
range.Font.Size = 9;//字体大小
//加边框
range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null);
range.EntireColumn.AutoFit();//自动调整列宽
}

rowRead++;
percent = ((float)(100 * rowRead)) / totalCount;
System.Windows.Forms.Application.DoEvents();
}

range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
if (dt.Columns.Count > 1)
{
range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
}

try
{
workbook.Saved = true;
workbook.SaveCopyAs(fileName);
}
catch (Exception ex)
{
MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
return;
}

workbooks.Close();
if (xlApp != null)
{
xlApp.Workbooks.Close();
xlApp.Quit();
int generation = System.GC.GetGeneration(xlApp);
System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
xlApp = null;
System.GC.Collect(generation);

}

GC.Collect();//强行销毁
#region 强行杀死最近打开的Excel进程

System.Diagnostics.Process[] excelProc = System.Diagnostics.Process.GetProcessesByName("EXCEL");
System.DateTime startTime = new DateTime();
int m, killId = 0;
for (m = 0; m < excelProc.Length; m++)
{
if (startTime < excelProc[m].StartTime)
{
startTime = excelProc[m].StartTime;
killId = m;
}
}
if (excelProc[killId].HasExited == false)
{
excelProc[killId].Kill();
}

#endregion
MessageBox.Show("导出成功!");
}
}