C#导出EXCEL(DataTable导出EXCEL)

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C#导出EXCEL(DataTable导出EXCEL)

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("");             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> ");

            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> ");             }             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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原文地址：https://www.cnblogs.com/DTWolf/p/4606798.html