C#导出EXCEL(DataTable导出EXCEL)
2017-11-14 09:25
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using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.IO;
using System.Web;
using Microsoft.Office.Interop.Excel;
using System.Reflection;
/*
* 开发人员：Hisen
* 时间：2008年11月24日
* 功能：将数据导出Excel
*
*/
namespace XT.LiTree.Logic
{
public class ExcelExport
{
private ExcelExport()
{ }
private static ExcelExport _instance = null;
public static ExcelExport Instance
{
get
{
if (_instance == null) _instance = new ExcelExport();
return _instance;
}
}
/// <summary>
/// DataTable直接导出Excel,此方法会把DataTable的数据用Excel打开,再自己手动去保存到确切的位置
/// </summary>
/// <param name="dt">要导出Excel的DataTable</param>
/// <returns></returns>
public bool DoExport(DataTable dt)
{
Application app = new ApplicationClass();
if (app == null)
{
throw new Exception("Excel无法启动");
}
app.Visible = true;
Workbooks wbs = app.Workbooks;
Workbook wb = wbs.Add(Missing.Value);
Worksheet ws = (Worksheet)wb.Worksheets[1];
int cnt = dt.Rows.Count;
int columncnt = dt.Columns.Count;
// *****************获取数据********************
object[,] objData = new Object[cnt + 1, columncnt]; // 创建缓存数据
// 获取列标题
for (int i = 0; i < columncnt; i++)
{
objData[0, i] = dt.Columns[i].ColumnName;
}
// 获取具体数据
for (int i = 0; i < cnt; i++)
{
System.Data.DataRow dr = dt.Rows[i];
for (int j = 0; j < columncnt; j++)
{
objData[i + 1, j] = dr[j];
}
}
//********************* 写入Excel******************
Range r = ws.get_Range(app.Cells[1, 1], app.Cells[cnt + 1, columncnt]);
r.NumberFormat = "@";
//r = r.get_Resize(cnt+1, columncnt);
r.Value2 = objData;
r.EntireColumn.AutoFit();
app = null;
return true;
}
/// <summary>
/// DataTable通过流导出Excel
/// </summary>
/// <param name="ds">数据源DataSet</param>
/// <param name="columns">DataTable中列对应的列名(可以是中文),若为null则取DataTable中的字段名</param>
/// <param name="fileName">保存文件名(例如：a.xls)</param>
/// <returns></returns>
public bool StreamExport(DataTable dt, string[] columns, string fileName, System.Web.UI.Page pages)
{
if (dt.Rows.Count > 65535) //总行数大于Excel的行数
{
throw new Exception("预导出的数据总行数大于excel的行数");
}
if (string.IsNullOrEmpty(fileName)) return false;
StringBuilder content = new StringBuilder();
StringBuilder strtitle = new StringBuilder();
content.Append("<html xmlns:o='urn:schemas-microsoft-com:office:office' xmlns:x='urn:schemas-microsoft-com:office:excel' xmlns='http://www.w3.org/TR/REC-html40'>");
content.Append("<head><title></title><meta http-equiv='Content-Type' content=\"text/html; charset=gb2312\">");
//注意：[if gte mso 9]到[endif]之间的代码，用于显示Excel的网格线，若不想显示Excel的网格线，可以去掉此代码
content.Append("<!--[if gte mso 9]>");
content.Append("<xml>");
content.Append(" <x:ExcelWorkbook>");
content.Append(" <x:ExcelWorksheets>");
content.Append(" <x:ExcelWorksheet>");
content.Append(" <x:Name>Sheet1</x:Name>");
content.Append(" <x:WorksheetOptions>");
content.Append(" <x:Print>");
content.Append(" <x:ValidPrinterInfo />");
content.Append(" </x:Print>");
content.Append(" </x:WorksheetOptions>");
content.Append(" </x:ExcelWorksheet>");
content.Append(" </x:ExcelWorksheets>");
content.Append("</x:ExcelWorkbook>");
content.Append("</xml>");
content.Append("<![endif]-->");
content.Append("</head><body><table style='border-collapse:collapse;table-layout:fixed;'><tr>");
if (columns != null)
{
for (int i = 0; i < columns.Length; i++)
{
if (columns[i] != null && columns[i] != "")
{
content.Append("<td><b>" + columns[i] + "</b></td>");
}
else
{
content.Append("<td><b>" + dt.Columns[i].ColumnName + "</b></td>");
}
}
}
else
{
for (int j = 0; j < dt.Columns.Count; j++)
{
content.Append("<td><b>" + dt.Columns[j].ColumnName + "</b></td>");
}
}
content.Append("</tr>\n");
for (int j = 0; j < dt.Rows.Count; j++)
{
content.Append("<tr>");
for (int k = 0; k < dt.Columns.Count; k++)
{
object obj = dt.Rows[j][k];
Type type = obj.GetType();
if (type.Name == "Int32" || type.Name == "Single" || type.Name == "Double" || type.Name == "Decimal")
{
double d = obj == DBNull.Value ? 0.0d : Convert.ToDouble(obj);
if (type.Name == "Int32" || (d - Math.Truncate(d) == 0))
content.AppendFormat("<td style='vnd.ms-excel.numberformat:#,##0'>{0}</td>", obj);
else
content.AppendFormat("<td style='vnd.ms-excel.numberformat:#,##0.00'>{0}</td>", obj);
}
else
content.AppendFormat("<td style='vnd.ms-excel.numberformat:@'>{0}</td>", obj);
}
content.Append("</tr>\n");
}
content.Append("</table></body></html>");
content.Replace(" ", "");
pages.Response.Clear();
pages.Response.Buffer = true;
pages.Response.ContentType = "application/ms-excel"; //"application/ms-excel";
pages.Response.Charset = "UTF-8";
pages.Response.ContentEncoding = System.Text.Encoding.UTF7;
fileName = System.Web.HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8);
pages.Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName);
pages.Response.Write(content.ToString());
//pages.Response.End(); //注意，若使用此代码结束响应可能会出现“由于代码已经过优化或者本机框架位于调用堆栈之上,无法计算表达式的值。”的异常。
HttpContext.Current.ApplicationInstance.CompleteRequest(); //用此行代码代替上一行代码，则不会出现上面所说的异常。
return true;
}
/// <summary>
/// 直接由GridView导出Excel
/// </summary>
/// <param name="ctl">控件(一般是GridView)</param>
/// <param name="FileName">导出的文件名</param>
/// <param name="removeIndexs">要移除的列的索引数组(因为有时我们并不希望把GridView中的所有列全部导出)</param>
/// <param name="pages"></param>
public void ControlToExcel(System.Web.UI.WebControls.GridView ctl, string FileName, string[] removeIndexs, System.Web.UI.Page pages)
{
if (removeIndexs != null)
{
foreach (string index in removeIndexs)
{
ctl.Columns[int.Parse(index)].Visible = false;
}
}
pages.Response.Charset = "UTF-8";
pages.Response.ContentEncoding = System.Text.Encoding.UTF7;
pages.Response.ContentType = "application/ms-excel";
FileName = System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);
pages.Response.AppendHeader("Content-Disposition", "attachment;filename=" + "" + FileName);
ctl.Page.EnableViewState = false;
System.IO.StringWriter tw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
ctl.RenderControl(hw);
pages.Response.Write(tw.ToString());
HttpContext.Current.ApplicationInstance.CompleteRequest();
}
}
}
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