C# 如何使用NPOI导出列表数据
我正在使用NPOI将数据导出到excel中。 所以我创建了一个列表,可以从我的数据库中提取数据。 现在我的问题是如何读取列表数据并将数据写入excel表格。 以下是我代码的一部分:C# 如何使用NPOI导出列表数据,c#,asp.net,asp.net-core,npoi,C#,Asp.net,Asp.net Core,Npoi,我正在使用NPOI将数据导出到excel中。 所以我创建了一个列表,可以从我的数据库中提取数据。 现在我的问题是如何读取列表数据并将数据写入excel表格。 以下是我代码的一部分: IWorkbook workbook; workbook = new NPOI.XSSF.UserModel.XSSFWorkbook(); ISheet excelSheet = workbook.CreateSheet("Candidates
IWorkbook workbook;
workbook = new NPOI.XSSF.UserModel.XSSFWorkbook();
ISheet excelSheet = workbook.CreateSheet("Candidates");
IRow row = excelSheet.CreateRow(0);
foreach (var data in ApplicationList)
{
}
workbook.Write(fs);
因此,基本上我需要有关
foreach(ApplicationList中的var数据)
的帮助,而编写数据单元格可以创建,SetCellValue可以帮助设置数据
下面我试着迭代一列和一列字符串。
这在我的系统上运行良好
IWorkbook workbook = new HSSFWorkbook();
ISheet excelSheet = workbook.CreateSheet("Candidates");
IRow row = excelSheet.CreateRow(0);
var applicantList = new List<string> { "David", "Paul" };
var excelColumns = new[] { "Name" };
IRow headerRow = excelSheet.CreateRow(0);
var headerColumn = 0;
excelColumns.ToList().ForEach(excelColumn =>
{
var cell = headerRow.CreateCell(headerColumn);
cell.SetCellValue(excelColumn);
headerColumn++;
});
var rowCount = 1;
applicantList.ForEach(applicant => {
var row = excelSheet.CreateRow(rowCount);
var cellCount = 0;
excelColumns.ToList().ForEach(column => {
var cell = row.CreateCell(cellCount);
cell.SetCellValue(applicant);
cellCount++;
});
rowCount++;
});
var stream = new MemoryStream();
workbook.Write(stream);
string FilePath = "/Users/hemkumar/hem.xls"; //path to download
FileStream file = new FileStream(FilePath, FileMode.CreateNew,
FileAccess.Write);
stream.WriteTo(file);
file.Close();
stream.Close();
IWorkbook工作簿=新的HSSFWorkbook();
ISheet excelSheet=workbook.CreateSheet(“候选者”);
IRow row=excelSheet.CreateRow(0);
var applicationlist=新列表{“David”,“Paul”};
var excelColumns=new[]{“Name”};
IRow headerRow=excelSheet.CreateRow(0);
var headerColumn=0;
excelColumns.ToList().ForEach(excelColumn=>
{
变量单元格=headerRow.CreateCell(headerColumn);
cell.SetCellValue(excelColumn);
headerColumn++;
});
var rowCount=1;
申请者列表。ForEach(申请者=>{
var row=excelSheet.CreateRow(行计数);
var-cellCount=0;
excelColumns.ToList().ForEach(列=>{
var cell=row.CreateCell(cellCount);
cell.SetCellValue(申请人);
cellCount++;
});
行计数++;
});
var stream=newmemoryStream();
工作簿。写(流);
字符串FilePath=“/Users/hemkumar/hem.xls”//下载路径
FileStream file=newfilestream(FilePath,FileMode.CreateNew,
FileAccess.Write);
stream.WriteTo(文件);
file.Close();
stream.Close();
我希望这会有帮助。我知道我来晚了一点,但我认为这可能会帮助其他人 我使用NPOI包开发了一个excel实用程序,它可以
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
namespace GenericExcelExport.ExcelExport
{
public interface IAbstractDataExport
{
HttpResponseMessage Export(List exportData, string fileName, string sheetName);
}
public abstract class AbstractDataExport : IAbstractDataExport
{
protected string _sheetName;
protected string _fileName;
protected List _headers;
protected List _type;
protected IWorkbook _workbook;
protected ISheet _sheet;
private const string DefaultSheetName = "Sheet1";
public HttpResponseMessage Export
(List exportData, string fileName, string sheetName = DefaultSheetName)
{
_fileName = fileName;
_sheetName = sheetName;
_workbook = new XSSFWorkbook(); //Creating New Excel object
_sheet = _workbook.CreateSheet(_sheetName); //Creating New Excel Sheet object
var headerStyle = _workbook.CreateCellStyle(); //Formatting
var headerFont = _workbook.CreateFont();
headerFont.IsBold = true;
headerStyle.SetFont(headerFont);
WriteData(exportData); //your list object to NPOI excel conversion happens here
//Header
var header = _sheet.CreateRow(0);
for (var i = 0; i < _headers.Count; i++)
{
var cell = header.CreateCell(i);
cell.SetCellValue(_headers[i]);
cell.CellStyle = headerStyle;
}
for (var i = 0; i < _headers.Count; i++)
{
_sheet.AutoSizeColumn(i);
}
using (var memoryStream = new MemoryStream()) //creating memoryStream
{
_workbook.Write(memoryStream);
var response = new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new ByteArrayContent(memoryStream.ToArray())
};
response.Content.Headers.ContentType = new MediaTypeHeaderValue
("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.Content.Headers.ContentDisposition =
new ContentDispositionHeaderValue("attachment")
{
FileName = $"{_fileName}_{DateTime.Now.ToString("yyyyMMddHHmmss")}.xlsx"
};
return response;
}
}
//Generic Definition to handle all types of List
public abstract void WriteData(List exportData);
}
}
using NPOI.SS.UserModel;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Text.RegularExpressions;
namespace GenericExcelExport.ExcelExport
{
public class AbstractDataExportBridge : AbstractDataExport
{
public AbstractDataExportBridge()
{
_headers = new List<string>();
_type = new List<string>();
}
public override void WriteData<T>(List<T> exportData)
{
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
DataTable table = new DataTable();
foreach (PropertyDescriptor prop in properties)
{
var type = Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType;
_type.Add(type.Name);
table.Columns.Add(prop.Name, Nullable.GetUnderlyingType(prop.PropertyType) ??
prop.PropertyType);
string name = Regex.Replace(prop.Name, "([A-Z])", " $1").Trim(); //space separated
//name by caps for header
_headers.Add(name);
}
foreach (T item in exportData)
{
DataRow row = table.NewRow();
foreach (PropertyDescriptor prop in properties)
row[prop.Name] = prop.GetValue(item) ?? DBNull.Value;
table.Rows.Add(row);
}
IRow sheetRow = null;
for (int i = 0; i < table.Rows.Count; i++)
{
sheetRow = _sheet.CreateRow(i + 1);
for (int j = 0; j < table.Columns.Count; j++)
{
ICell Row1 = sheetRow.CreateCell(j);
string type = _type[j].ToLower();
var currentCellValue = table.Rows[i][j];
if (currentCellValue != null &&
!string.IsNullOrEmpty(Convert.ToString(currentCellValue)))
{
if (type == "string")
{
Row1.SetCellValue(Convert.ToString(currentCellValue));
}
else if (type == "int32")
{
Row1.SetCellValue(Convert.ToInt32(currentCellValue));
}
else if (type == "double")
{
Row1.SetCellValue(Convert.ToDouble(currentCellValue));
}
}
else
{
Row1.SetCellValue(string.Empty);
}
}
}
}
}
}
使用NPOI.SS.UserModel;
使用NPOI.XSSF.UserModel;
使用制度;
使用System.Collections.Generic;
使用System.IO;
Net系统;
使用System.Net.Http;
使用System.Net.Http.Header;
命名空间GenericExcelExport.ExcelExport
{
公共接口IAbstractDataExport
{
HttpResponseMessage导出(列表导出数据、字符串文件名、字符串名称);
}
公共抽象类AbstractDataExport:IAbstractDataExport
{
受保护的字符串\u sheetName;
受保护的字符串\u文件名;
受保护的列表头;
受保护列表类型;
受保护的IWorkbook\u工作簿;
受保护的ISHET_表;
private const string DefaultSheetName=“Sheet1”;
公共HttpResponseMessage导出
(列出exportData、字符串文件名、字符串sheetName=DefaultSheetName)
{
_fileName=文件名;
_sheetName=sheetName;
_工作簿=新建XSSF工作簿();//创建新的Excel对象
_工作表=\u工作簿.CreateSheet(\u sheetName);//创建新的Excel工作表对象
var headerStyle=_工作簿.CreateCellStyle();//格式
var headerFont=_workbook.CreateFont();
headerFont.IsBold=true;
headerStyle.SetFont(headerFont);
WriteData(exportData);//列表对象到NPOI excel的转换在此处进行
//标题
var头=_sheet.CreateRow(0);
对于(变量i=0;i<\u headers.Count;i++)
{
var cell=header.CreateCell(i);
cell.SetCellValue(_头[i]);
cell.CellStyle=headerStyle;
}
对于(变量i=0;i<\u headers.Count;i++)
{
_表1.AutoSizeColumn(i);
}
使用(var memoryStream=new memoryStream())//创建memoryStream
{
_工作簿。编写(memoryStream);
var响应=新的HttpResponseMessage(HttpStatusCode.OK)
{
Content=newbyteArray内容(memoryStream.ToArray())
};
response.Content.Headers.ContentType=新的MediaTypeHeaderValue
(“application/vnd.openxmlformats of cedocument.spreadsheetml.sheet”);
response.Content.Headers.ContentDisposition=
新内容配置HeaderValue(“附件”)
{
FileName=$“{{u FileName}{DateTime.Now.ToString(“yyyyMMddHHmmss”)}.xlsx”
};
返回响应;
}
}
//处理所有类型列表的通用定义
公共摘要无效写入数据(列表导出数据);
}
}
这是第二个也是最后一个文件AbstractDataExportBridge.cs:
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
namespace GenericExcelExport.ExcelExport
{
public interface IAbstractDataExport
{
HttpResponseMessage Export(List exportData, string fileName, string sheetName);
}
public abstract class AbstractDataExport : IAbstractDataExport
{
protected string _sheetName;
protected string _fileName;
protected List _headers;
protected List _type;
protected IWorkbook _workbook;
protected ISheet _sheet;
private const string DefaultSheetName = "Sheet1";
public HttpResponseMessage Export
(List exportData, string fileName, string sheetName = DefaultSheetName)
{
_fileName = fileName;
_sheetName = sheetName;
_workbook = new XSSFWorkbook(); //Creating New Excel object
_sheet = _workbook.CreateSheet(_sheetName); //Creating New Excel Sheet object
var headerStyle = _workbook.CreateCellStyle(); //Formatting
var headerFont = _workbook.CreateFont();
headerFont.IsBold = true;
headerStyle.SetFont(headerFont);
WriteData(exportData); //your list object to NPOI excel conversion happens here
//Header
var header = _sheet.CreateRow(0);
for (var i = 0; i < _headers.Count; i++)
{
var cell = header.CreateCell(i);
cell.SetCellValue(_headers[i]);
cell.CellStyle = headerStyle;
}
for (var i = 0; i < _headers.Count; i++)
{
_sheet.AutoSizeColumn(i);
}
using (var memoryStream = new MemoryStream()) //creating memoryStream
{
_workbook.Write(memoryStream);
var response = new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new ByteArrayContent(memoryStream.ToArray())
};
response.Content.Headers.ContentType = new MediaTypeHeaderValue
("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.Content.Headers.ContentDisposition =
new ContentDispositionHeaderValue("attachment")
{
FileName = $"{_fileName}_{DateTime.Now.ToString("yyyyMMddHHmmss")}.xlsx"
};
return response;
}
}
//Generic Definition to handle all types of List
public abstract void WriteData(List exportData);
}
}
using NPOI.SS.UserModel;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Text.RegularExpressions;
namespace GenericExcelExport.ExcelExport
{
public class AbstractDataExportBridge : AbstractDataExport
{
public AbstractDataExportBridge()
{
_headers = new List<string>();
_type = new List<string>();
}
public override void WriteData<T>(List<T> exportData)
{
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
DataTable table = new DataTable();
foreach (PropertyDescriptor prop in properties)
{
var type = Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType;
_type.Add(type.Name);
table.Columns.Add(prop.Name, Nullable.GetUnderlyingType(prop.PropertyType) ??
prop.PropertyType);
string name = Regex.Replace(prop.Name, "([A-Z])", " $1").Trim(); //space separated
//name by caps for header
_headers.Add(name);
}
foreach (T item in exportData)
{
DataRow row = table.NewRow();
foreach (PropertyDescriptor prop in properties)
row[prop.Name] = prop.GetValue(item) ?? DBNull.Value;
table.Rows.Add(row);
}
IRow sheetRow = null;
for (int i = 0; i < table.Rows.Count; i++)
{
sheetRow = _sheet.CreateRow(i + 1);
for (int j = 0; j < table.Columns.Count; j++)
{
ICell Row1 = sheetRow.CreateCell(j);
string type = _type[j].ToLower();
var currentCellValue = table.Rows[i][j];
if (currentCellValue != null &&
!string.IsNullOrEmpty(Convert.ToString(currentCellValue)))
{
if (type == "string")
{
Row1.SetCellValue(Convert.ToString(currentCellValue));
}
else if (type == "int32")
{
Row1.SetCellValue(Convert.ToInt32(currentCellValue));
}
else if (type == "double")
{
Row1.SetCellValue(Convert.ToDouble(currentCellValue));
}
}
else
{
Row1.SetCellValue(string.Empty);
}
}
}
}
}
}
使用NPOI.SS.UserModel;
使用制度;
使用System.Collections.Generic;
使用系统组件模型;
使用系统数据;
使用System.Text.RegularExpressions;
命名空间GenericExcelExport.ExcelExport
{
公共类AbstractDataExportBridge:AbstractDataExport
{
公共抽象数据导出桥()
{
_headers=新列表();
_类型=新列表();
}
公共覆盖无效写入数据(列表导出数据)
{
PropertyDescriptorCollection属性=TypeDescriptor.GetProperties(typeof(T));
DataTable=新的DataTable();
foreach(属性中的PropertyDescriptor属性)
{
var type=Nullable.getUnderlineType(prop.PropertyType)??prop.PropertyType;
_type.Add(type.Name);
table.Columns.Add(prop.Name,null.getUnderlinegType(prop.PropertyType)??
属性类型);