一个关于Excel的处理类（部分参考网络上）

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Data.OleDb;

using System.IO;

namespace Northwind.Web.common

{

public class ExcelHelper

{

//将控件转换为Excel表

public static void ExportToExcel(Control c, string fileName)

{

HttpContext.Current.Response.Clear();

HttpContext.Current.Response.Buffer = true;

HttpContext.Current.Response.Charset = "utf-7";//不行就改为utf-7

HttpContext.Current.Response.AppendHeader("Content-Disposition", string.Format("attachment;filename={0}.xls", fileName));

HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-7");//设置输出流为简体中文

HttpContext.Current.Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。

//this.EnableViewState = false;

System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN", true);

System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);

System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);

c.RenderControl(oHtmlTextWriter);

HttpContext.Current.Response.Write(oStringWriter.ToString());

HttpContext.Current.Response.End();

}

//判断有没有相同的列，暂时只支持一列

public static bool CanImport(string filename, string sheetName, string column)

{

string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filename + ";Extended Properties=Excel 8.0;";

if (column != "")

{

using (OleDbConnection conn = new OleDbConnection(strConn))

{

OleDbDataAdapter oada = new OleDbDataAdapter(string.Format("select {0} from [{1}$] group by {0} having count({0})=2", column, sheetName), strConn);

DataTable dt = new DataTable();

oada.Fill(dt);

conn.Close();

if (dt.Rows.Count > 0) { return false; }

}

}

return true;

}

//将excel数据转换为DataTable

public static DataTable ImportToTable(string filename, string sheetName)

{

DataTable dt = new DataTable();

string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filename + ";Extended Properties=Excel 8.0;";

using (OleDbConnection conn = new OleDbConnection(strConn))

{

OleDbDataAdapter oada = new OleDbDataAdapter(string.Format("select * from [{0}$]", sheetName), strConn);

oada.Fill(dt);

}

return dt;

}

//从gridview导出Excel

public static void ExportFromGridview(string fileName, GridView gv)

{

HttpContext.Current.Response.Clear();

HttpContext.Current.Response.Charset = "utf-7";

HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-7");//设置输出流为简体中文

HttpContext.Current.Response.AddHeader(

"content-disposition", string.Format("attachment; filename={0}.xls", fileName));

HttpContext.Current.Response.ContentType = "application/ms-excel";

using (StringWriter sw = new StringWriter())

{

using (HtmlTextWriter htw = new HtmlTextWriter(sw))

{

// Create a form to contain the grid

Table table = new Table();

// add the header row to the table

if (gv.HeaderRow != null)

{

PrepareControlForExport(gv.HeaderRow);

table.Rows.Add(gv.HeaderRow);

}

// add each of the data rows to the table

foreach (GridViewRow row in gv.Rows)

{

PrepareControlForExport(row);

table.Rows.Add(row);

}

// add the footer row to the table

if (gv.FooterRow != null)

{

PrepareControlForExport(gv.FooterRow);

table.Rows.Add(gv.FooterRow);

}

// render the table into the htmlwriter

table.RenderControl(htw);

// render the htmlwriter into the response

HttpContext.Current.Response.Write(sw.ToString());

HttpContext.Current.Response.End();

}

}

}

//处理gridview里面的特殊控件，如下拉列表或文本框等

private static void PrepareControlForExport(Control control)

{

for (int i = 0; i < control.Controls.Count; i++)

{

Control current = control.Controls[i];

if (current is LinkButton)

{

control.Controls.Remove(current);

control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));

}

else if (current is ImageButton)

{

control.Controls.Remove(current);

control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText));

}

else if (current is HyperLink)

{

control.Controls.Remove(current);

control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text));

}

else if (current is DropDownList)

{

control.Controls.Remove(current);

control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text));

}

else if (current is CheckBox)

{

control.Controls.Remove(current);

control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False"));

}

if (current.HasControls())

{

PrepareControlForExport(current);

}

}

}

}

}