1､安装引用DotNetCore.NPOI

1）使用Nuget界面管理器

搜索"DotNetCore.NPOI",在列表中找到它，点击"安装"

相关文档：VS(Visual Studio)中Nuget的使用

2）使用Package Manager命令安装

PM> Install-Package DotNetCore.NPOI

3）使用.NET CLI命令安装

> dotnet add TodoApi.csproj package DotNetCore.NPOI

2､生成Excel文件代码

var newFile = @"newbook.core.xlsx";
using (var fs = new FileStream(newFile, FileMode.Create, FileAccess.Write)) {
    IWorkbook workbook = new XSSFWorkbook();
    ISheet sheet1 = workbook.CreateSheet("Sheet1");
    sheet1.AddMergedRegion(new CellRangeAddress(0, 0, 0, 10));
    var rowIndex = 0;
    IRow row = sheet1.CreateRow(rowIndex);
    row.Height = 30 * 80;
    row.CreateCell(0).SetCellValue("this is content");
    sheet1.AutoSizeColumn(0);
    rowIndex++;
    var sheet2 = workbook.CreateSheet("Sheet2");
    var style1 = workbook.CreateCellStyle();
    style1.FillForegroundColor = HSSFColor.Blue.Index2;
    style1.FillPattern = FillPattern.SolidForeground;
    var style2 = workbook.CreateCellStyle();
    style2.FillForegroundColor = HSSFColor.Yellow.Index2;
    style2.FillPattern = FillPattern.SolidForeground;
    var cell2 = sheet2.CreateRow(0).CreateCell(0);
    cell2.CellStyle = style1;
    cell2.SetCellValue(0);
    cell2 = sheet2.CreateRow(1).CreateCell(0);
    cell2.CellStyle = style2;
    cell2.SetCellValue(1);
    workbook.Write(fs);
}

3､生成Word文件代码

var newFile2 = @"newbook.core.docx";
using (var fs = new FileStream(newFile2, FileMode.Create, FileAccess.Write)) {
    XWPFDocument doc = new XWPFDocument();
    var p0 = doc.CreateParagraph();
    p0.Alignment = ParagraphAlignment.CENTER;
    XWPFRun r0 = p0.CreateRun();
    r0.FontFamily = "microsoft yahei";
    r0.FontSize = 18;
    r0.IsBold = true;
    r0.SetText("This is title");
    var p1 = doc.CreateParagraph();
    p1.Alignment = ParagraphAlignment.LEFT;
    p1.IndentationFirstLine = 500;
    XWPFRun r1 = p1.CreateRun();
    r1.FontFamily = "·ÂËÎ";
    r1.FontSize = 12;
    r1.IsBold = true;
    r1.SetText("This is content, content content content content content content content content content");
    doc.Write(fs);
}

4､配置Linux上使用NPOI

在Linux上，您需要安装 libgdiplus。从1.2.0开始，还需要libdl。

1) Ubuntu 16.04及以上版本配置

apt-get install libgdiplus libc6-dev
cd /usr/lib
ln -s libgdiplus.so gdiplus.dll

2) Fedora 23及以上版本配置

dnf install libgdiplus
cd /usr/lib64/
ln -s libgdiplus.so.0 gdiplus.dll 

3) CentOS 7及以上版本配置

yum install autoconf automake libtool
yum install freetype-devel fontconfig libXft-devel
yum install libjpeg-turbo-devel libpng-devel giflib-devel libtiff-devel libexif-devel
yum install glib2-devel cairo-devel
git clone https://github.com/mono/libgdiplus
cd libgdiplus
./autogen.sh
make
make install
cd /usr/lib64/
ln -s /usr/local/lib/libgdiplus.so gdiplus.dll

4) Docker中配置

Alpine：

# base sdk-alpine/aspnetcore-runtime-alpine images
RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
RUN apk --update add libgdiplus

Debian：

FROM microsoft/dotnet:2.1-aspnetcore-runtime
RUN apt-get update && apt-get install -y libgdiplus libc6-dev && ln -s /usr/lib/libgdiplus.so /usr/lib/gdiplus.dll

相关文档：

https://github.com/dotnetcore/NPOI

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