前言:
用传统的导出方法:只是将DataGrid信息用html输出,文件名后辍是.xls而已。如果想将这个方法导入到Sql Server 中,会提示出错。因为它不是标准的Excel格式文件。
用本例中的导出方法:会输出标准的Excel格式文件,非常稳定,不会死锁Excel进程,支持中文文件名,支持表头导出,支持大多数数据库导入。
实现算法:
利用Excel组件将DataGrid控件内容生成Excel临时文件,并存放在服务器上,并用Response方法将生成的Excel文件下载到客户端,再将生成的临时文件删除。
具体步骤:
1.在项目中引用Excel组件
Interop.Excel.dll 文件版本1.3.0.0
2.项目中应有一个目录(本例中Template目录),以便存放Excel文件(名字自己定)
3.导入方法类
以下是代码片段:
/// <summary>
/// 将DataGrid中数据导出至Excel,生成标准的Excel文件
/// </summary>
/// <param name="grid">DataGrid控件ID</param>
/// <param name="fileName">导出文件名</param>
protected void ExportToExcel(System.Web.UI.WebControls.DataGrid grid,string fileName)
{
string templetFilePath;
templetFilePath = Server.MapPath("../").ToString() + @"Template\";
object missing = Missing.Value;
Excel.Application app;
Excel.Workbook workBook;
Excel.Worksheet workSheet;
Excel.Range range;
//创建一个Application对象并使其不可见
app = new Excel.ApplicationClass();
app.Visible=false;
//打开模板文件,得到WorkBook对象
//workBook = app.Workbooks.Open(templetFilePath + "SuperTemplet.xls", missing, missing, missing, missing, missing,
// missing, missing, missing, missing, missing, missing, missing);
//创建一个WorkBook对象
workBook = app.Workbooks.Add(missing);
//得到WorkSheet对象
workSheet = (Excel.Worksheet)workBook.Sheets.get_Item(1);
int rowCount = grid.Items.Count + 1; //DataTable行数+GirdHead
int colCount = grid.Columns.Count; //DataTable列数
//利用二维数组批量写入
string[,] arr = new string[rowCount, colCount];
for (int j = 0; j < rowCount; j++)
{
for (int k = 0; k < colCount; k++)
{
if (j == 0)
{
arr[j, k] = grid.Columns[k].HeaderText;
}
else
{
arr[j, k] = grid.Items[j - 1].Cells[k].Text.ToString();
}
}
}
range = (Excel.Range)workSheet.Cells[1, 1]; //写入Exel的坐标
range = range.get_Resize(rowCount, colCount);
range.Value = arr;
workBook.SaveAs(templetFilePath + fileName, missing, missing, missing, missing, missing,Excel.XlSaveAsAccessMode.xlExclusive, missing, missing, missing, missing);
if (workBook.Saved)
{
workBook.Close(null, null, null);
app.Workbooks.Close();
app.Quit();
}
if (range != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(range);
range = null;
}
if (workSheet != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(workSheet);
workSheet = null;
}
if (workBook != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(workBook);
workBook = null;
}
if (app != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
app = null;
}
GC.Collect();//强制代码垃圾回收
//下载文件
DownLoadFile(templetFilePath,fileName);
}
4.下载文件方法类
以下是代码片段:
/// <summary>
/// 下载服务器文件到客户端
/// </summary>
/// <param name="_FilePath">文件路径</param>
/// <param name="_FileName">文件名</param>
/// <returns>返回 bool型</returns>
private bool DownLoadFile(string _FilePath,string _FileName)
{
try
{
System.IO.FileStream fs = System.IO.File.OpenRead(_FilePath+_FileName);
byte[] FileData = new byte[fs.Length];
fs.Read(FileData, 0, (int)fs.Length);
Response.Clear();
Response.AddHeader("Content-Type", "application/ms-excel");
string FileName = System.Web.HttpUtility.UrlEncode(System.Text.Encoding.UTF8.GetBytes(_FileName));
Response.AddHeader("Content-Disposition", "inline;filename=" + System.Convert.ToChar(34) + FileName + System.Convert.ToChar(34));
Response.AddHeader("Content-Length", fs.Length.ToString());
Response.BinaryWrite(FileData);
fs.Close();
//删除服务器临时文件
System.IO.File.Delete(_FilePath+_FileName);
Response.Flush();
Response.End();
return true;
}
catch(Exception ex)
{
ex.Message.ToString();
return false;
}
}
5.应用方法
以下是代码片段:
protected void btnExportToExcel_Click(object sender, EventArgs e)
{
this.ExportToExcel(grdBudget,"中国石油大港油田油管厂发料记录.xls");//grdBudget 是DataGrid的ID
}