前些天写了一篇JQGRID导出数据的文章，为什么在客户端实现，其实是被逼无奈，因为在服务器上安装EXCEL，然后配置DCOM一直不成功，老是不能成功调用服务器上的EXCEL应用程序，然后今天发现上次那个JQGRID导出在IE8和FF浏览器中不兼容，只能在IE6使用，因为里面使用了document.execCommand命令来导出，而在IE8或者FF中出于安全性问题这个命令只能用来导出txt或者html文件，不能用来导出xls文件了.今天无意中百度到了一个第三方EXCEL插件，可以不用在服务器上安装EXCEL配置DCOM都能实现从服务器下载EXCEL文件。org.in2bits.MyXls.dll请在百度里搜索一下就能下载到。下面提供一个ExcelHelper，这个类从网上找到的，我自己根据自己的需求改动了一下，用来构造并发送excel文件给客户端下载.
using System; using System.Data; using System.Configuration; using System.Web; using System.Collections.Generic; using org.in2bits.MyXls; using org.in2bits.MyXls.ByteUtil; /// <summary> ///ExcelHelper 的摘要说明 /// </summary> public class ExcelHelper { protected ExcelHelper() { } public class TableStruct { private string _TableName; private string _TableCaption; private List<ColumnStruct> _ColumnInfoAry; public string TableName { get { if (string.IsNullOrEmpty(_TableName)) { return string.Empty; } return _TableName; } set { _TableName = value; } } public string TableCaption { get { if (string.IsNullOrEmpty(_TableCaption)) { return TableName; } return _TableCaption; } set { _TableCaption = value; } } public List<ColumnStruct> ColumnInfoAry { get { if (_ColumnInfoAry == null) { _ColumnInfoAry = new List<ColumnStruct>(); } return _ColumnInfoAry; } } public void AddColumnInfo(ColumnStruct ColumnInfo) { if (ColumnInfo == null) { return; } if (_ColumnInfoAry == null) { _ColumnInfoAry = new List<ColumnStruct>(); } foreach (ColumnStruct col in _ColumnInfoAry) { if (col.ColumnName.Equals(ColumnInfo.ColumnName, StringComparison.OrdinalIgnoreCase)) { return; } } _ColumnInfoAry.Add(ColumnInfo); } public ColumnStruct GetColumnInfo(string ColumnName) { if (string.IsNullOrEmpty(ColumnName)) { return null; } if (_ColumnInfoAry == null) { return null; } ColumnStruct ColumnInfo = null; foreach (ColumnStruct col in _ColumnInfoAry) { if (col.ColumnName.Equals(ColumnName, StringComparison.OrdinalIgnoreCase)) { ColumnInfo = col; } } return ColumnInfo; } } public class ColumnStruct { private string _ColumnName; private string _ColumnCaption; private string _ColumnTextFormat; public string ColumnName { get { if (string.IsNullOrEmpty(_ColumnName)) { return string.Empty; } return _ColumnName; } set { _ColumnName = value; } } public string ColumnCaption { get { if (string.IsNullOrEmpty(_ColumnCaption)) { return ColumnName; } return _ColumnCaption; } set { _ColumnCaption = value; } } public string ColumnTextFormat { get { if (string.IsNullOrEmpty(_ColumnTextFormat)) { return string.Empty; } return _ColumnTextFormat; } set { _ColumnTextFormat = value; } } } public static void ExportToExcel(DataSet ds, List<TableStruct> TableInfoAry) { if (ds == null) { ds = new DataSet(); } if (TableInfoAry == null) { TableInfoAry = new List<TableStruct>(); } XlsDocument xls = new XlsDocument(); xls.FileName = DateTime.Now.ToString("yyyyMMddHHmmssffff", System.Globalization.DateTimeFormatInfo.InvariantInfo); xls.SummaryInformation.Author = "wangmh"; //填加xls文件作者信息 xls.SummaryInformation.NameOfCreatingApplication = "Microsoft Excel"; //填加xls文件创建程序信息 xls.SummaryInformation.LastSavedBy = "wangmh"; //填加xls文件最后保存者信息 xls.SummaryInformation.Comments = "Gwm"; //填加xls文件作者信息 xls.SummaryInformation.Title = "Gwm"; //填加xls文件标题信息 xls.SummaryInformation.Subject = "Gwm";//填加文件主题信息 xls.DocumentSummaryInformation.Company = "Gwm";//填加文件公司信息 foreach (TableStruct TableInfo in TableInfoAry) { DataTable dt = ds.Tables[TableInfo.TableName]; if (dt == null) { continue; } Worksheet sheet = xls.Workbook.Worksheets.Add(TableInfo.TableCaption); //设置标头栏 ushort ColumnIndex = 1; foreach (ColumnStruct ColStruct in TableInfo.ColumnInfoAry) { ushort RowIndex = 1; Row row = sheet.Rows.AddRow(RowIndex); if (!dt.Columns.Contains(ColStruct.ColumnName)) { continue; } Cell cell = null; if (row.CellExists(ColumnIndex)) { cell = row.GetCell(ColumnIndex); } else { cell = sheet.Cells.Add(RowIndex, ColumnIndex, null); //row.AddCell(cell); } cell.Value = ColStruct.ColumnCaption; cell.Font.Weight = FontWeight.Bold; cell.HorizontalAlignment = HorizontalAlignments.Centered; cell.BottomLineStyle = 2; cell.BottomLineColor = Colors.Grey; cell.Font.Height = 10 * 20; cell.VerticalAlignment = VerticalAlignments.Centered; ushort ColumnMaxLength = GetColumnValueMaxLength(dt, ColStruct); //设定列宽为自适应宽度 ColumnInfo colInfo = new ColumnInfo(xls, sheet);//生成列格式对象 //设定colInfo格式的起作用的列为第1列到第5列(列格式为0-base) colInfo.ColumnIndexStart = (ushort)(ColumnIndex - 1); colInfo.ColumnIndexEnd = colInfo.ColumnIndexStart; colInfo.Width = (ushort)(ColumnMaxLength * 256);//列的宽度计量单位为 1/256 字符宽 sheet.AddColumnInfo(colInfo);//把格式附加到sheet页上（注：AddColumnInfo方法有点小问题，不能把colInfo对象多次附给sheet页） ColumnIndex++; } for (ushort i = 0; i < dt.Rows.Count; i++) { ushort RowIndex = (ushort)(i + 2); Row row = sheet.Rows.AddRow(RowIndex); int j = 0; foreach (ColumnStruct ColStruct in TableInfo.ColumnInfoAry) { if (!dt.Columns.Contains(ColStruct.ColumnName)) { continue; } ColumnIndex = (ushort)(j + 1); Cell cell = null; if (row.CellExists(ColumnIndex)) { cell = row.GetCell(ColumnIndex); } else { cell = sheet.Cells.Add(RowIndex, ColumnIndex, null); //row.AddCell(cell); } object objValue = dt.Rows[i][ColStruct.ColumnName]; cell.Value = GetColumnValueFormat(dt, ColStruct, objValue); cell.Font.Weight = FontWeight.Normal; cell.HorizontalAlignment = HorizontalAlignments.Centered; j++; } } } xls.Send(); } private static string GetColumnValueFormat(DataTable dt, ColumnStruct ColStruct, Object ObjValue) { string ColumnValue = string.Empty; if (ObjValue != null && ObjValue != DBNull.Value) { string ColumnDataType = dt.Columns[ColStruct.ColumnName].DataType.ToString(); switch (ColumnDataType) { case "System.Boolean": case "System.Byte": { ColumnValue = ObjValue.ToString(); break; } case "System.Decimal": { if (string.IsNullOrEmpty(ColStruct.ColumnTextFormat)) { ColumnValue = Convert.ToDecimal(ObjValue).ToString(); } else { ColumnValue = Convert.ToDecimal(ObjValue).ToString(ColStruct.ColumnTextFormat); } break; } case "System.Double": { if (string.IsNullOrEmpty(ColStruct.ColumnTextFormat)) { ColumnValue = Convert.ToDouble(ObjValue).ToString(); } else { ColumnValue = Convert.ToDouble(ObjValue).ToString(ColStruct.ColumnTextFormat); } break; } case "System.Int64": { if (string.IsNullOrEmpty(ColStruct.ColumnTextFormat)) { ColumnValue = Convert.ToInt64(ObjValue).ToString(); } else { ColumnValue = Convert.ToInt64(ObjValue).ToString(ColStruct.ColumnTextFormat); } break; } case "System.Int16": { if (string.IsNullOrEmpty(ColStruct.ColumnTextFormat)) { ColumnValue = Convert.ToInt16(ObjValue).ToString(); } else { ColumnValue = Convert.ToInt16(ObjValue).ToString(ColStruct.ColumnTextFormat); } break; } case "System.Int32": { if (string.IsNullOrEmpty(ColStruct.ColumnTextFormat)) { ColumnValue = Convert.ToInt32(ObjValue).ToString(); } else { ColumnValue = Convert.ToInt32(ObjValue).ToString(ColStruct.ColumnTextFormat); } break; } case "System.DateTime": { if (string.IsNullOrEmpty(ColStruct.ColumnTextFormat)) { ColumnValue = Convert.ToDateTime(ObjValue).ToString(); } else { ColumnValue = Convert.ToDateTime(ObjValue).ToString(ColStruct.ColumnTextFormat, System.Globalization.DateTimeFormatInfo.InvariantInfo); } break; } default: { ColumnValue = ObjValue.ToString(); break; } } } return ColumnValue.Trim(); } private static ushort GetColumnValueMaxLength(DataTable dt, ColumnStruct ColStruct) { ushort InitLenth = (ushort)System.Text.Encoding.Default.GetByteCount(ColStruct.ColumnCaption); ushort MaxLenth = InitLenth; foreach (DataRow Row in dt.Rows) { object ObjValue = Row[ColStruct.ColumnName]; if (ObjValue == null || ObjValue == DBNull.Value) { continue; } string ColumnValue = GetColumnValueFormat(dt, ColStruct, ObjValue); ushort ColumnValueLenth = (ushort)System.Text.Encoding.Default.GetByteCount(ColumnValue); MaxLenth = ColumnValueLenth > MaxLenth ? ColumnValueLenth : MaxLenth; } if (MaxLenth == InitLenth) { //标题栏字体较大 MaxLenth += 4; } else { //内容文本前后与边框空余出一字的间隔 MaxLenth += 2; } return (ushort)(MaxLenth * 1.2); } /// <summary> /// /// </summary> /// <param name="ds">要导出的数据集</param> /// <param name="columncaptions">要导出的列标题</param> /// <param name="columnnames">要导出的列名，用来与ds数据集中的列进行匹配</param> /// <param name="tableCaption">sheet名</param> public static void ExportDataToExcel(DataSet ds, string[] columncaptions, string[] columnnames, string tableCaption) { System.Collections.Generic.List<ExcelHelper.TableStruct> TableInfoAry = new System.Collections.Generic.List<ExcelHelper.TableStruct>(); ExcelHelper.TableStruct TableInfo = new ExcelHelper.TableStruct(); TableInfo.TableName = ds.Tables[0].TableName; TableInfo.TableCaption = tableCaption; if (columncaptions == null && columnnames == null) { foreach (DataColumn dc in ds.Tables[0].Columns) { ExcelHelper.ColumnStruct ColStruct = new ExcelHelper.ColumnStruct(); ColStruct.ColumnName = dc.ColumnName; ColStruct.ColumnTextFormat = string.Empty; ColStruct.ColumnCaption = dc.Caption; TableInfo.AddColumnInfo(ColStruct); } } else if(columnnames.Length!=columncaptions.Length) { throw new ArgumentException("列名和列标题长度不一致"); } else { for (int i = 0; i < columnnames.Length; i++) { ExcelHelper.ColumnStruct ColStruct = new ExcelHelper.ColumnStruct(); ColStruct.ColumnName = columnnames[i]; ColStruct.ColumnTextFormat = string.Empty; ColStruct.ColumnCaption = columncaptions[i]; TableInfo.AddColumnInfo(ColStruct); } } TableInfoAry.Add(TableInfo); ExcelHelper.ExportToExcel(ds, TableInfoAry); } public static void ExportDataToExcel(DataSet ds, string tableCaption) { ExportDataToExcel(ds, null, null, tableCaption); } }
这个HELPER主要就是使用public static void ExportDataToExcel(DataSet ds, string[] columncaptions, string[] columnnames, string tableCaption)这个方法。参数说明已经在方法上注明了。调用可以这样调用：
string[] columncaptions = { "列1", "列2" }; string[] columnsname = { "column1", "column2" };//注意这里的值要与 DataTable的列名一致 DataSet ds2 = new DataSet(); DataTable dt = new DataTable("test"); DataColumn col = new DataColumn("column1"); col.Caption = "我是列1"; dt.Columns.Add(col); col = new DataColumn("column2"); col.Caption = "我是列2"; dt.Columns.Add(col); DataRow dr = dt.NewRow(); dr[0] = "列1"; dr[1] = "列2"; dt.Rows.Add(dr); ds2.Tables.Add(dt); ExcelHelper.ExportDataToExcel(ds, columncaptions, columnsname, ds.Tables[0].TableName);
具体需求可以自己改动ExcelHelper的代码来实现，而不应该局限于我这种方式。