JsonToExcel：
public static void JsonToExcel(List<Dictionary<string, object>> json, string fileName)
{
using (MemoryStream ms = new MemoryStream())
{ IWorkbook workbook = null; if (fileName.IndexOf(".xlsx") > )
workbook = new XSSFWorkbook();
if (fileName.IndexOf(".xls") > )
workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet();
IRow headerRow = sheet.CreateRow(); //// handling header.
//foreach (DataColumn column in table.Columns)
// headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//If Caption not set, returns the ColumnName value var keys = json.FirstOrDefault().Keys.ToList();
for (var i = ; i < keys.Count(); i++)
{
headerRow.CreateCell(i).SetCellValue(keys[i]);
} // handling value.
int rowIndex = ; for (var i = ; i < json.Count(); i++)
{
IRow dataRow = sheet.CreateRow(rowIndex); var values=json[i].Values.ToList();
for (var j = ; j <values.Count();j++)
{
dataRow.CreateCell(j).SetCellValue(values[j].ToString());
} rowIndex++;
} workbook.Write(ms);
ms.Flush(); using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray(); fs.Write(data, , data.Length);
fs.Flush(); data = null;
}
}
}
DataTableToExcel:
public static void dataTableToExcel(DataTable table, string fileName)
{
using (MemoryStream ms = new MemoryStream())
{ IWorkbook workbook = null; if (fileName.IndexOf(".xlsx") > )
workbook = new XSSFWorkbook();
if (fileName.IndexOf(".xls") > )
workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet();
IRow headerRow = sheet.CreateRow(); // handling header.
foreach (DataColumn column in table.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//If Caption not set, returns the ColumnName value // handling value.
int rowIndex = ; foreach (DataRow row in table.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex); foreach (DataColumn column in table.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
} rowIndex++;
} workbook.Write(ms);
ms.Flush(); using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray(); fs.Write(data, , data.Length);
fs.Flush(); data = null;
}
}
}
ExcelToDataTable:
/// <summary>
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="sheetName">excel工作薄sheet的名称</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
/// <returns>返回的DataTable</returns>
public static DataTable ExcelToDataTable(string filePath, bool isColumnName, int sheetName)
{
DataTable dataTable = null;
FileStream fs = null;
DataColumn column = null;
DataRow dataRow = null;
IWorkbook workbook = null;
ISheet sheet = null;
IRow row = null;
ICell cell = null;
int startRow = ;
try
{
using (fs = File.OpenRead(filePath))
{
// 2007版本
if (filePath.IndexOf(".xlsx") > )
workbook = new XSSFWorkbook(fs);
// 2003版本
else if (filePath.IndexOf(".xls") > )
workbook = new HSSFWorkbook(fs); if (workbook != null)
{
sheet = workbook.GetSheetAt(sheetName);//读取第一个sheet，当然也可以循环读取每个sheet
dataTable = new DataTable();
if (sheet != null)
{
int rowCount = sheet.LastRowNum;//总行数
if (rowCount > )
{
IRow firstRow = sheet.GetRow();//第一行
int cellCount = firstRow.LastCellNum;//列数 //构建datatable的列
if (isColumnName)
{
startRow = ;//如果第一行是列名，则从第二行开始读取
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
cell = firstRow.GetCell(i);
if (cell != null)
{
if (cell.StringCellValue != null)
{
column = new DataColumn(cell.StringCellValue);
dataTable.Columns.Add(column);
}
}
}
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
column = new DataColumn("column" + (i + ));
dataTable.Columns.Add(column);
}
} //填充行
for (int i = startRow; i <= rowCount; ++i)
{
row = sheet.GetRow(i);
if (row == null) continue;
dataRow = dataTable.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
cell = row.GetCell(j);
if (cell == null)
{
dataRow[j] = "";
}
else
{
//CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
switch (cell.CellType)
{
case CellType.Blank:
dataRow[j] = "";
break;
case CellType.Numeric:
short format = cell.CellStyle.DataFormat;
//对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理
if (format == || format == || format == || format == )
dataRow[j] = cell.DateCellValue;
else
dataRow[j] = cell.NumericCellValue;
break;
case CellType.String:
dataRow[j] = cell.StringCellValue;
break;
}
}
}
dataTable.Rows.Add(dataRow);
}
}
}
}
}
return dataTable;
}
catch (Exception ex)
{
Console.WriteLine("exception:" + ex.ToString());
Console.ReadLine();
if (fs != null)
{
fs.Close();
}
return null;
}
}