EXCEL导入导出自己整理的一些方法

//导入Excel代码
protected DataTable ExcelHelper(string filePaht)
{
string sFilePath2003 = Server.MapPath("ExcelData/2003.xls");
//string sFilePath2007 = Server.MapPath("ExcelData/2007.xlsx");

// 支持Excel2003 和 Excel2007 的连接字符串
// "HDR=yes;"是说第一行是列名而不是数据，"HDR=No;"正好与前面的相反。
// 如果列中的数据类型不一致，使用"IMEX=1"可必免数据类型冲突。
string sConn = "provider=Microsoft.ACE.OleDb.12.0; Data Source ='" + sFilePath2003 + "';Extended Properties='Excel 12.0;HDR=yes;IMEX=1';";
if (string.IsNullOrEmpty(sConn)) {  return null ; }

DataTable dtExcel = new DataTable();
using (OleDbConnection conn = new OleDbConnection(sConn))
{
conn.Open();
// 获取Excel的第一个SheetName
string sSheetName = "";
DataTable dtSheet = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" });
if (dtSheet.Rows.Count > 0)
sSheetName = dtSheet.Rows[0]["Table_Name"].ToString();
else
return null;
// 获取Excel数据
string sSql = string.Format("select * from [{0}]", sSheetName);
OleDbDataAdapter adapter = new OleDbDataAdapter(sSql, conn);
adapter.Fill(dtExcel);
conn.Close();
}

return dtExcel;
}

/// <summary>
/// 导出EXCEL，直接传入一个List对象

List<Students> list = new List<Students> {
new Students{name="xiaochun",sex="man",age="20"},
new Students{name="xiaochun",sex="man",age="20"},
new Students{name="xiaochun",sex="man",age="20"},
new Students{name="xiaochun",sex="man",age="20"},
};
GridView gvw=new GridView ();
gvw.AllowPaging=false;
gvw.DataSource= list.Select(s => new { 姓名 = s.name, 性别 = s.sex, 年龄 = s.age });
gvw.DataBind();

ObjectToExcel(gvw);

/// <summary>
/// 导出EXCEL[直接传入一个GridView]
/// </summary>
private void ObjectToExcel(System.Web.UI.WebControls.GridView gvw)
{
System.Web.UI.WebControls.GridView gvExport = gvw;
System.Web.HttpContext curContext = System.Web.HttpContext.Current;
System.IO.StringWriter strWriter = null;
System.Web.UI.HtmlTextWriter htmlWriter = null;
if (gvw.Rows.Count>0)
{
curContext.Response.AddHeader("content-disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode("财务报表", System.Text.Encoding.UTF8) + ".xlsx");
curContext.Response.ContentType = "application/vnd.ms-excel";
curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
curContext.Response.Charset = "utf-8";
strWriter = new System.IO.StringWriter();
htmlWriter = new HtmlTextWriter(strWriter);

gvExport.RenderControl(htmlWriter);
curContext.Response.Write(strWriter.ToString());
curContext.Response.End();

}
}

/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
private void ObjectToExcel<T>(List<T> list)
{
System.Web.UI.WebControls.GridView gvExport = null;
System.Web.HttpContext curContext = System.Web.HttpContext.Current;
System.IO.StringWriter strWriter = null;
System.Web.UI.HtmlTextWriter htmlWriter = null;
if (list != null)
{
curContext.Response.AddHeader("content-disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode("财务报表", System.Text.Encoding.UTF8) + ".xlsx");
curContext.Response.ContentType = "application/vnd.ms-excel";
curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
curContext.Response.Charset = "utf-8";
strWriter = new System.IO.StringWriter();
htmlWriter = new HtmlTextWriter(strWriter);

gvExport = new GridView();
gvExport.DataSource = list;
gvExport.AllowPaging = false;
gvExport.DataBind();

gvExport.RenderControl(htmlWriter);
curContext.Response.Write(strWriter.ToString());
curContext.Response.End();

}
}