很多的软件项目几乎都包含着对文档的操作,前面已经介绍过两款操作文档的组件,现在介绍一款文档操作的组件NPOI。
NPOI可以生成没有安装在您的服务器上的Microsoft Office套件的Excel报表,并且在后台调用Microsoft Excel ActiveX更有效率;从Office文档中提取文本,以帮助您实现全文索引功能(大多数时候,此功能用于创建搜索引擎); 从Office文档提取图像; 生成包含公式的Excel工作表。
一.NPOI组件概述:
NPOI是完全免费使用; 涵盖Excel的大多数功能(单元格样式,数据格式,公式等);支持xls,xlsx,docx;设计为面向接口(看看NPOI.SS命名空间);支持不仅导出而且导入; .Net 2.0甚至为xlsx和docx(虽然我们也支持.NET 4.0); 来自世界各地的成功案例;巨大的基本例子;对隔离存储没有依赖。
以上是NPOI的优点,其他一些优点可以不用太在意,估计很多人对“支持xls,xlsx,docx”这一特点感觉有些惊讶,因为在很多人的印象里面NPOI就是对Excel进行相关的操作,但是在这里突然看到了对docx也可以操作,这一特点可能让很多人感到欣喜,因为NPOI的的确确是一个很不错的组件,用过的人都说好,我也不例外。
NPOI的运行要求:VS2010与.NET 4.0运行时;VS2005或VS2008与.NET 2.0运行时(SP1);vs2003与.NET 1.1;Mono;ASP.NET中的中等信任环境。
二.NPOI核心类和方法解析:
以上是对NPOI的相关背景和使用环境做了一个简单的介绍,接下来我具体的看一下NPOI的一些核心类和方法,由于下载的是DLL文件,还是采用.NET Reflector对DLL文件进行反编译,以此查看源代码。
如果需要具体的了解NPOI可以直接访问:http://npoi.codeplex.com/SourceControl/latest,提供了NPOI的源码和一些demo,由于本溪介绍的重点是NPOI对Excel的操作,所以下面的类和实例主要是对操作Excel的介绍,如果需要对docx的操作,可以具体查看相应的类demo。
1.XSSFWorkbook类CreateSheet():创建表。
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public ISheet CreateSheet( string sheetname)
{
if (sheetname == null )
{
throw new ArgumentException( "sheetName must not be null" );
}
if ( this .ContainsSheet(sheetname, this .sheets.Count))
{
throw new ArgumentException( "The workbook already contains a sheet of this name" );
}
if (sheetname.Length > 0x1f)
{
sheetname = sheetname.Substring(0, 0x1f);
}
WorkbookUtil.ValidateSheetName(sheetname);
CT_Sheet sheet = this .AddSheet(sheetname);
int index = 1;
foreach (XSSFSheet sheet2 in this .sheets)
{
index = ( int ) Math.Max(( long ) (sheet2.sheet.sheetId + 1), ( long ) index);
}
Label_0099:
foreach (XSSFSheet sheet3 in this .sheets)
{
index = ( int ) Math.Max(( long ) (sheet3.sheet.sheetId + 1), ( long ) index);
}
string fileName = XSSFRelation.WORKSHEET.GetFileName(index);
foreach (POIXMLDocumentPart part in base .GetRelations())
{
if ((part.GetPackagePart() != null ) && fileName.Equals(part.GetPackagePart().PartName.Name))
{
index++;
goto Label_0099;
}
}
XSSFSheet item = (XSSFSheet) base .CreateRelationship(XSSFRelation.WORKSHEET, XSSFFactory.GetInstance(), index);
item.sheet = sheet;
sheet.id = item.GetPackageRelationship().Id;
sheet.sheetId = ( uint ) index;
if ( this .sheets.Count == 0)
{
item.IsSelected = true ;
}
this .sheets.Add(item);
return item;
}
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2.XSSFSheet类Write():将文件流写入到excel。
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internal virtual void Write(Stream stream)
{
bool flag = false ;
if ( this .worksheet.sizeOfColsArray() == 1)
{
CT_Cols colsArray = this .worksheet.GetColsArray(0);
if (colsArray.sizeOfColArray() == 0)
{
flag = true ;
this .worksheet.SetColsArray( null );
}
else
{
this .SetColWidthAttribute(colsArray);
}
}
if ( this .hyperlinks.Count > 0)
{
if ( this .worksheet.hyperlinks == null )
{
this .worksheet.AddNewHyperlinks();
}
CT_Hyperlink[] array = new CT_Hyperlink[ this .hyperlinks.Count];
for ( int i = 0; i < array.Length; i++)
{
XSSFHyperlink hyperlink = this .hyperlinks[i];
hyperlink.GenerateRelationIfNeeded( base .GetPackagePart());
array[i] = hyperlink.GetCTHyperlink();
}
this .worksheet.hyperlinks.SetHyperlinkArray(array);
}
foreach (XSSFRow row in this ._rows.Values)
{
row.OnDocumentWrite();
}
Dictionary< string , string > dictionary = new Dictionary< string , string >();
dictionary[ST_RelationshipId.NamespaceURI] = "r" ;
new WorksheetDocument( this .worksheet).Save(stream);
if (flag)
{
this .worksheet.AddNewCols();
}
}
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3.XSSFSheet类CreateRow():创建行。
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public virtual IRow CreateRow( int rownum)
{
CT_Row cTRow;
XSSFRow row2 = this ._rows.ContainsKey(rownum) ? this ._rows[rownum] : null ;
if (row2 != null )
{
cTRow = row2.GetCTRow();
cTRow.Set( new CT_Row());
}
else if (( this ._rows.Count == 0) || (rownum > this .GetLastKey( this ._rows.Keys)))
{
cTRow = this .worksheet.sheetData.AddNewRow();
}
else
{
int count = this .HeadMap( this ._rows, rownum).Count;
cTRow = this .worksheet.sheetData.InsertNewRow(count);
}
XSSFRow row3 = new XSSFRow(cTRow, this ) {
RowNum = rownum
};
this ._rows[rownum] = row3;
return row3;
}
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4.XSSFWorkbook类GetSheet:获取表。
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public ISheet GetSheet( string name)
{
foreach (XSSFSheet sheet in this .sheets)
{
if (name.Equals(sheet.SheetName, StringComparison.InvariantCultureIgnoreCase))
{
return sheet;
}
}
return null ;
}
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5.WorkbookFactory类:
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public class PropertySetFactory
{
public static PropertySet Create(DirectoryEntry dir, string name);
public static PropertySet Create(Stream stream);
public static SummaryInformation CreateSummaryInformation();
public static DocumentSummaryInformation CreateDocumentSummaryInformation();
}
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6.DocumentSummaryInformation:
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[Serializable]
public class DocumentSummaryInformation : SpecialPropertySet
{
// Fields
public const string DEFAULT_STREAM_NAME = "\x0005DocumentSummaryInformation" ;
// Methods
public DocumentSummaryInformation(PropertySet ps);
private void EnsureSection2();
public void RemoveByteCount();
public void RemoveCategory();
public void RemoveCompany();
public void RemoveCustomProperties();
public void RemoveDocparts();
public void RemoveHeadingPair();
public void RemoveHiddenCount();
public void RemoveLineCount();
public void RemoveLinksDirty();
public void RemoveManager();
public void RemoveMMClipCount();
public void RemoveNoteCount();
public void RemoveParCount();
public void RemovePresentationFormat();
public void RemoveScale();
public void RemoveSlideCount();
// Properties
public int ByteCount { get ; set ; }
public string Category { get ; set ; }
public string Company { get ; set ; }
public CustomProperties CustomProperties { get ; set ; }
public byte [] Docparts { get ; set ; }
public byte [] HeadingPair { get ; set ; }
public int HiddenCount { get ; set ; }
public int LineCount { get ; set ; }
public bool LinksDirty { get ; set ; }
public string Manager { get ; set ; }
public int MMClipCount { get ; set ; }
public int NoteCount { get ; set ; }
public int ParCount { get ; set ; }
public string PresentationFormat { get ; set ; }
public override PropertyIDMap PropertySetIDMap { get ; }
public bool Scale { get ; set ; }
public int SlideCount { get ; set ; }
}
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具体方法:
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private void EnsureSection2()
{
if ( this .SectionCount < 2)
{
MutableSection section = new MutableSection();
section.SetFormatID(SectionIDMap.DOCUMENT_SUMMARY_INFORMATION_ID2);
this .AddSection(section);
}
}
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以上只是对部分的类和方法做了简单的说明,需要了解更多的内容,可以进入官网下载源码,或者使用软件查看DLL文件。
三.NPOI操作实例:
1.枚举(Excel单元格数据类型):
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/// <summary>
/// 枚举(Excel单元格数据类型)
/// </summary>
public enum NpoiDataType
{
/// <summary>
/// 字符串类型-值为1
/// </summary>
String,
/// <summary>
/// 布尔类型-值为2
/// </summary>
Bool,
/// <summary>
/// 时间类型-值为3
/// </summary>
Datetime,
/// <summary>
/// 数字类型-值为4
/// </summary>
Numeric,
/// <summary>
/// 复杂文本类型-值为5
/// </summary>
Richtext,
/// <summary>
/// 空白
/// </summary>
Blank,
/// <summary>
/// 错误
/// </summary>
Error
}
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2. 将DataTable数据导入到excel中:
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/// <summary>
/// 将DataTable数据导入到excel中
/// </summary>
/// <param name="data">要导入的数据</param>
/// <param name="isColumnWritten">DataTable的列名是否要导入</param>
/// <param name="sheetName">要导入的excel的sheet的名称</param>
/// <param name="fileName">文件夹路径</param>
/// <returns>导入数据行数(包含列名那一行)</returns>
public static int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten, string fileName)
{
if (data == null )
{
throw new ArgumentNullException( "data" );
}
if ( string .IsNullOrEmpty(sheetName))
{
throw new ArgumentNullException(sheetName);
}
if ( string .IsNullOrEmpty(fileName))
{
throw new ArgumentNullException(fileName);
}
IWorkbook workbook = null ;
if (fileName.IndexOf( ".xlsx" , StringComparison.Ordinal) > 0)
{
workbook = new XSSFWorkbook();
}
else if (fileName.IndexOf( ".xls" , StringComparison.Ordinal) > 0)
{
workbook = new HSSFWorkbook();
}
FileStream fs = null ;
try
{
fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
ISheet sheet;
if (workbook != null )
{
sheet = workbook.CreateSheet(sheetName);
}
else
{
return -1;
}
int j;
int count;
//写入DataTable的列名,写入单元格中
if (isColumnWritten)
{
var row = sheet.CreateRow(0);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
}
count = 1;
}
else
{
count = 0;
}
//遍历循环datatable具体数据项
int i;
for (i = 0; i < data.Rows.Count; ++i)
{
var row = sheet.CreateRow(count);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
++count;
}
//将文件流写入到excel
workbook.Write(fs);
return count;
}
catch (IOException ioex)
{
throw new IOException(ioex.Message);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if (fs != null )
{
fs.Close();
}
}
}
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3.将excel中的数据导入到DataTable中:
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/// <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>
/// <param name="fileName">文件路径</param>
/// <returns>返回的DataTable</returns>
public static DataTable ExcelToDataTable( string sheetName, bool isFirstRowColumn, string fileName)
{
if ( string .IsNullOrEmpty(sheetName))
{
throw new ArgumentNullException(sheetName);
}
if ( string .IsNullOrEmpty(fileName))
{
throw new ArgumentNullException(fileName);
}
var data = new DataTable();
IWorkbook workbook = null ;
FileStream fs = null ;
try
{
fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
if (fileName.IndexOf( ".xlsx" , StringComparison.Ordinal) > 0)
{
workbook = new XSSFWorkbook(fs);
}
else if (fileName.IndexOf( ".xls" , StringComparison.Ordinal) > 0)
{
workbook = new HSSFWorkbook(fs);
}
ISheet sheet = null ;
if (workbook != null )
{
//如果没有找到指定的sheetName对应的sheet,则尝试获取第一个sheet
sheet = workbook.GetSheet(sheetName) ?? workbook.GetSheetAt(0);
}
if (sheet == null ) return data;
var firstRow = sheet.GetRow(0);
//一行最后一个cell的编号 即总的列数
int cellCount = firstRow.LastCellNum;
int startRow;
if (isFirstRowColumn)
{
for ( int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
var cell = firstRow.GetCell(i);
var cellValue = cell.StringCellValue;
if (cellValue == null ) continue ;
var column = new DataColumn(cellValue);
data.Columns.Add(column);
}
startRow = sheet.FirstRowNum + 1;
}
else
{
startRow = sheet.FirstRowNum;
}
//最后一列的标号
var rowCount = sheet.LastRowNum;
for (var i = startRow; i <= rowCount; ++i)
{
var row = sheet.GetRow(i);
//没有数据的行默认是null
if (row == null ) continue ;
var dataRow = data.NewRow();
for ( int j = row.FirstCellNum; j < cellCount; ++j)
{
//同理,没有数据的单元格都默认是null
if (row.GetCell(j) != null )
dataRow[j] = row.GetCell(j).ToString();
}
data.Rows.Add(dataRow);
}
return data;
}
catch (IOException ioex)
{
throw new IOException(ioex.Message);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if (fs != null )
{
fs.Close();
}
}
}
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4.读取Excel文件内容转换为DataSet:
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/// <summary>
/// 读取Excel文件内容转换为DataSet,列名依次为 "c0"……c[columnlength-1]
/// </summary>
/// <param name="fileName">文件绝对路径</param>
/// <param name="startRow">数据开始行数(1为第一行)</param>
/// <param name="columnDataType">每列的数据类型</param>
/// <returns></returns>
public static DataSet ReadExcel( string fileName, int startRow, params NpoiDataType[] columnDataType)
{
var ds = new DataSet( "ds" );
var dt = new DataTable( "dt" );
var sb = new StringBuilder();
using (var stream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
//使用接口,自动识别excel2003/2007格式
var workbook = WorkbookFactory.Create(stream);
//得到里面第一个sheet
var sheet = workbook.GetSheetAt(0);
int j;
IRow row;
//ColumnDataType赋值
if (columnDataType.Length <= 0)
{
//得到第i行
row = sheet.GetRow(startRow - 1);
columnDataType = new NpoiDataType[row.LastCellNum];
for (var i = 0; i < row.LastCellNum; i++)
{
var hs = row.GetCell(i);
columnDataType[i] = GetCellDataType(hs);
}
}
for (j = 0; j < columnDataType.Length; j++)
{
var tp = GetDataTableType(columnDataType[j]);
dt.Columns.Add( "c" + j, tp);
}
for (var i = startRow - 1; i <= sheet.PhysicalNumberOfRows; i++)
{
//得到第i行
row = sheet.GetRow(i);
if (row == null ) continue ;
try
{
var dr = dt.NewRow();
for (j = 0; j < columnDataType.Length; j++)
{
dr[ "c" + j] = GetCellData(columnDataType[j], row, j);
}
dt.Rows.Add(dr);
}
catch (Exception er)
{
sb.Append( string .Format( "第{0}行出错:{1}\r\n" , i + 1, er.Message));
}
}
ds.Tables.Add(dt);
}
if (ds.Tables[0].Rows.Count == 0 && sb.ToString() != "" ) throw new Exception(sb.ToString());
return ds;
}
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5.从DataSet导出到2003:
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/// <summary>
/// 从DataSet导出到MemoryStream流2003
/// </summary>
/// <param name="saveFileName">文件保存路径</param>
/// <param name="sheetName">Excel文件中的Sheet名称</param>
/// <param name="ds">存储数据的DataSet</param>
/// <param name="startRow">从哪一行开始写入,从0开始</param>
/// <param name="datatypes">DataSet中的各列对应的数据类型</param>
public static bool CreateExcel2003( string saveFileName, string sheetName, DataSet ds, int startRow, params NpoiDataType[] datatypes)
{
try
{
if (startRow < 0) startRow = 0;
var wb = new HSSFWorkbook();
var dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "pkm" ;
var si = PropertySetFactory.CreateSummaryInformation();
si.Title =
si.Subject = "automatic genereted document" ;
si.Author = "pkm" ;
wb.DocumentSummaryInformation = dsi;
wb.SummaryInformation = si;
var sheet = wb.CreateSheet(sheetName);
//sheet.SetColumnWidth(0, 50 * 256);
//sheet.SetColumnWidth(1, 100 * 256);
ICell cell;
int j;
var maxLength = 0;
var curLength = 0;
object columnValue;
var dt = ds.Tables[0];
if (datatypes.Length < dt.Columns.Count)
{
datatypes = new NpoiDataType[dt.Columns.Count];
for (var i = 0; i < dt.Columns.Count; i++)
{
var dtcolumntype = dt.Columns[i].DataType.Name.ToLower();
switch (dtcolumntype)
{
case "string" :
datatypes[i] = NpoiDataType.String;
break ;
case "datetime" :
datatypes[i] = NpoiDataType.Datetime;
break ;
case "boolean" :
datatypes[i] = NpoiDataType.Bool;
break ;
case "double" :
datatypes[i] = NpoiDataType.Numeric;
break ;
default :
datatypes[i] = NpoiDataType.String;
break ;
}
}
}
// 创建表头
var row = sheet.CreateRow(0);
//样式
var style1 = wb.CreateCellStyle();
//字体
var font1 = wb.CreateFont();
//字体颜色
font1.Color = HSSFColor.White.Index;
//字体加粗样式
font1.Boldweight = ( short )FontBoldWeight.Bold;
//style1.FillBackgroundColor = HSSFColor.WHITE.index;
style1.FillForegroundColor = HSSFColor.Green.Index;
//GetXLColour(wb, LevelOneColor);// 设置图案色
//GetXLColour(wb, LevelOneColor);// 设置背景色
style1.FillPattern = FillPattern.SolidForeground;
//样式里的字体设置具体的字体样式
style1.SetFont(font1);
//文字水平对齐方式
style1.Alignment = HorizontalAlignment.Center;
//文字垂直对齐方式
style1.VerticalAlignment = VerticalAlignment.Center;
row.HeightInPoints = 25;
for (j = 0; j < dt.Columns.Count; j++)
{
columnValue = dt.Columns[j].ColumnName;
curLength = Encoding.Default.GetByteCount(columnValue.ToString());
maxLength = (maxLength < curLength ? curLength : maxLength);
var colounwidth = 256 * maxLength;
sheet.SetColumnWidth(j, colounwidth);
try
{
//创建第0行的第j列
cell = row.CreateCell(j);
//单元格式设置样式
cell.CellStyle = style1;
try
{
cell.SetCellType(CellType.String);
cell.SetCellValue(columnValue.ToString());
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
// 创建每一行
for (var i = startRow; i < ds.Tables[0].Rows.Count; i++)
{
var dr = ds.Tables[0].Rows[i];
//创建第i行
row = sheet.CreateRow(i + 1);
for (j = 0; j < dt.Columns.Count; j++)
{
columnValue = dr[j];
curLength = Encoding.Default.GetByteCount(columnValue.ToString());
maxLength = (maxLength < curLength ? curLength : maxLength);
var colounwidth = 256 * maxLength;
sheet.SetColumnWidth(j, colounwidth);
try
{
//创建第i行的第j列
cell = row.CreateCell(j);
// 插入第j列的数据
try
{
var dtype = datatypes[j];
switch (dtype)
{
case NpoiDataType.String:
{
cell.SetCellType(CellType.Numeric);
cell.SetCellValue(columnValue.ToString());
}
break ;
case NpoiDataType.Datetime:
{
cell.SetCellType(CellType.Numeric);
cell.SetCellValue(columnValue.ToString());
}
break ;
case NpoiDataType.Numeric:
{
cell.SetCellType(CellType.Numeric);
cell.SetCellValue(Convert.ToDouble(columnValue));
}
break ;
case NpoiDataType.Bool:
{
cell.SetCellType(CellType.Numeric);
cell.SetCellValue(Convert.ToBoolean(columnValue));
}
break ;
case NpoiDataType.Richtext:
{
cell.SetCellType(CellType.Numeric);
cell.SetCellValue(columnValue.ToString());
}
break ;
}
}
catch (Exception ex)
{
cell.SetCellType(CellType.Numeric);
cell.SetCellValue(columnValue.ToString());
throw new Exception(ex.Message);
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
}
//生成文件在服务器上
using (var fs = new FileStream(saveFileName, FileMode.OpenOrCreate, FileAccess.Write))
{
wb.Write(fs);
}
return true ;
}
catch (Exception er)
{
throw new Exception(er.Message);
}
}
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6.从DataSet导出到MemoryStream流2007:
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/// <summary>
/// 从DataSet导出到MemoryStream流2007
/// </summary>
/// <param name="saveFileName">文件保存路径</param>
/// <param name="sheetName">Excel文件中的Sheet名称</param>
/// <param name="ds">存储数据的DataSet</param>
/// <param name="startRow">从哪一行开始写入,从0开始</param>
/// <param name="datatypes">DataSet中的各列对应的数据类型</param>
public static bool CreateExcel2007( string saveFileName, string sheetName, DataSet ds, int startRow, params NpoiDataType[] datatypes)
{
try
{
if (startRow < 0) startRow = 0;
var wb = new XSSFWorkbook();
var sheet = wb.CreateSheet(sheetName);
ICell cell;
int j;
var maxLength = 0;
int curLength;
object columnValue;
var dt = ds.Tables[0];
if (datatypes.Length < dt.Columns.Count)
{
datatypes = new NpoiDataType[dt.Columns.Count];
for (var i = 0; i < dt.Columns.Count; i++)
{
var dtcolumntype = dt.Columns[i].DataType.Name.ToLower();
switch (dtcolumntype)
{
case "string" :
datatypes[i] = NpoiDataType.String;
break ;
case "datetime" :
datatypes[i] = NpoiDataType.Datetime;
break ;
case "boolean" :
datatypes[i] = NpoiDataType.Bool;
break ;
case "double" :
datatypes[i] = NpoiDataType.Numeric;
break ;
default :
datatypes[i] = NpoiDataType.String;
break ;
}
}
}
//创建表头
var row = sheet.CreateRow(0);
//样式
var style1 = wb.CreateCellStyle();
//字体
var font1 = wb.CreateFont();
//字体颜色
font1.Color = HSSFColor.White.Index;
//字体加粗样式
font1.Boldweight = ( short )FontBoldWeight.Bold;
//style1.FillBackgroundColor = HSSFColor.WHITE.index;
//GetXLColour(wb, LevelOneColor);
// 设置图案色
style1.FillForegroundColor = HSSFColor.Green.Index;
//GetXLColour(wb, LevelOneColor);// 设置背景色
style1.FillPattern = FillPattern.SolidForeground;
//样式里的字体设置具体的字体样式
style1.SetFont(font1);
//文字水平对齐方式
style1.Alignment = HorizontalAlignment.Center;
//文字垂直对齐方式
style1.VerticalAlignment = VerticalAlignment.Center;
row.HeightInPoints = 25;
for (j = 0; j < dt.Columns.Count; j++)
{
columnValue = dt.Columns[j].ColumnName;
curLength = Encoding.Default.GetByteCount(columnValue.ToString());
maxLength = (maxLength < curLength ? curLength : maxLength);
var colounwidth = 256 * maxLength;
sheet.SetColumnWidth(j, colounwidth);
try
{
//创建第0行的第j列
cell = row.CreateCell(j);
//单元格式设置样式
cell.CellStyle = style1;
try
{
cell.SetCellValue(columnValue.ToString());
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
// 创建每一行
for (var i = startRow; i < ds.Tables[0].Rows.Count; i++)
{
var dr = ds.Tables[0].Rows[i];
//创建第i行
row = sheet.CreateRow(i + 1);
for (j = 0; j < dt.Columns.Count; j++)
{
columnValue = dr[j];
curLength = Encoding.Default.GetByteCount(columnValue.ToString());
maxLength = (maxLength < curLength ? curLength : maxLength);
var colounwidth = 256 * maxLength;
sheet.SetColumnWidth(j, colounwidth);
try
{
//创建第i行的第j列
cell = row.CreateCell(j);
// 插入第j列的数据
try
{
var dtype = datatypes[j];
switch (dtype)
{
case NpoiDataType.String:
{
cell.SetCellValue(columnValue.ToString());
}
break ;
case NpoiDataType.Datetime:
{
cell.SetCellValue(columnValue.ToString());
}
break ;
case NpoiDataType.Numeric:
{
cell.SetCellValue(Convert.ToDouble(columnValue));
}
break ;
case NpoiDataType.Bool:
{
cell.SetCellValue(Convert.ToBoolean(columnValue));
}
break ;
case NpoiDataType.Richtext:
{
cell.SetCellValue(columnValue.ToString());
}
break ;
}
}
catch (Exception ex)
{
cell.SetCellValue(columnValue.ToString());
throw new Exception(ex.Message);
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
}
//生成文件在服务器上
using (var fs = new FileStream(saveFileName, FileMode.OpenOrCreate, FileAccess.Write))
{
wb.Write(fs);
}
return true ;
}
catch (Exception er)
{
throw new Exception(er.Message);
}
}
|
7.读Excel-根据NpoiDataType创建的DataTable列的数据类型:
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/// <summary>
/// 读Excel-根据NpoiDataType创建的DataTable列的数据类型
/// </summary>
/// <param name="datatype"></param>
/// <returns></returns>
private static Type GetDataTableType(NpoiDataType datatype)
{
var tp = typeof ( string );
switch (datatype)
{
case NpoiDataType.Bool:
tp = typeof ( bool );
break ;
case NpoiDataType.Datetime:
tp = typeof (DateTime);
break ;
case NpoiDataType.Numeric:
tp = typeof ( double );
break ;
case NpoiDataType.Error:
tp = typeof ( string );
break ;
case NpoiDataType.Blank:
tp = typeof ( string );
break ;
}
return tp;
}
/// <summary>
/// 读Excel-得到不同数据类型单元格的数据
/// </summary>
/// <param name="datatype">数据类型</param>
/// <param name="row">数据中的一行</param>
/// <param name="column">哪列</param>
/// <returns></returns>
private static object GetCellData(NpoiDataType datatype, IRow row, int column)
{
switch (datatype)
{
case NpoiDataType.String:
try
{
return row.GetCell(column).DateCellValue;
}
catch
{
try
{
return row.GetCell(column).StringCellValue;
}
catch
{
return row.GetCell(column).NumericCellValue;
}
}
case NpoiDataType.Bool:
try { return row.GetCell(column).BooleanCellValue; }
catch { return row.GetCell(column).StringCellValue; }
case NpoiDataType.Datetime:
try { return row.GetCell(column).DateCellValue; }
catch { return row.GetCell(column).StringCellValue; }
case NpoiDataType.Numeric:
try { return row.GetCell(column).NumericCellValue; }
catch { return row.GetCell(column).StringCellValue; }
case NpoiDataType.Richtext:
try { return row.GetCell(column).RichStringCellValue; }
catch { return row.GetCell(column).StringCellValue; }
case NpoiDataType.Error:
try { return row.GetCell(column).ErrorCellValue; }
catch { return row.GetCell(column).StringCellValue; }
case NpoiDataType.Blank:
try { return row.GetCell(column).StringCellValue; }
catch { return "" ; }
default : return "" ;
}
}
/// <summary>
/// 获取单元格数据类型
/// </summary>
/// <param name="hs">单元格对象</param>
/// <returns></returns>
private static NpoiDataType GetCellDataType(ICell hs)
{
NpoiDataType dtype;
DateTime t1;
var cellvalue = "" ;
switch (hs.CellType)
{
case CellType.Blank:
dtype = NpoiDataType.String;
cellvalue = hs.StringCellValue;
break ;
case CellType.Boolean:
dtype = NpoiDataType.Bool;
break ;
case CellType.Numeric:
dtype = NpoiDataType.Numeric;
cellvalue = hs.NumericCellValue.ToString(CultureInfo.InvariantCulture);
break ;
case CellType.String:
dtype = NpoiDataType.String;
cellvalue = hs.StringCellValue;
break ;
case CellType.Error:
dtype = NpoiDataType.Error;
break ;
default :
dtype = NpoiDataType.Datetime;
break ;
}
if (cellvalue != "" && DateTime.TryParse(cellvalue, out t1)) dtype = NpoiDataType.Datetime;
return dtype;
}
|
四.总结:
本文是接着上五篇介绍.NET组件,目的只是在于总结一些组件的用法,将文章作为一个引子,各位读者可以根据文章的介绍更加深入的去了解相关组件。有些地方写的有误,还望多多包涵和指正,欢迎大家给我建议介绍一些你们在项目中经常使用的组件,可以跟大家做一个分享。
原文链接:http://www.cnblogs.com/pengze0902/p/6150070.html