c# - 将 LINQ 对象列表导出到 Excel 文件

Question

从 Web 应用程序，是否有一种简单的方法可以将 LINQ 对象列表导出到 Excel 文件？有什么好的图书馆可以做到这一点吗？

Answer 1

这是我根据上面 VB 视频的链接最终导出的 Excel。它采用任何对象列表(不包括 Entity Framework 对象上的导航属性和集合)并将它们导出到 Excel。它在大约 4 秒内导出大约 35K 条记录。

public void ExportToExcel<T>(List<T> list)
    {
        int columnCount = 0;

        DateTime StartTime = DateTime.Now;

        StringBuilder rowData = new StringBuilder();

        PropertyInfo[] properties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);

        rowData.Append("<Row ss:StyleID=\"s62\">");
        foreach (PropertyInfo p in properties)
        {
            if (p.PropertyType.Name != "EntityCollection`1" && p.PropertyType.Name != "EntityReference`1" && p.PropertyType.Name != p.Name)
            {
                columnCount++;
                rowData.Append("<Cell><Data ss:Type=\"String\">" + p.Name + "</Data></Cell>");
            }
            else
                break;

        }
        rowData.Append("</Row>");

        foreach (T item in list)
        {                
            rowData.Append("<Row>");
            for (int x = 0; x < columnCount; x++) //each (PropertyInfo p in properties)
            {                    
                object o = properties[x].GetValue(item, null);
                string value = o == null ? "" : o.ToString();                    
                rowData.Append("<Cell><Data ss:Type=\"String\">" + value + "</Data></Cell>");

            }
            rowData.Append("</Row>");
        }

        var sheet = @"<?xml version=""1.0""?>
                    <?mso-application progid=""Excel.Sheet""?>
                    <Workbook xmlns=""urn:schemas-microsoft-com:office:spreadsheet""
                        xmlns:o=""urn:schemas-microsoft-com:office:office""
                        xmlns:x=""urn:schemas-microsoft-com:office:excel""
                        xmlns:ss=""urn:schemas-microsoft-com:office:spreadsheet""
                        xmlns:html=""http://www.w3.org/TR/REC-html40"">
                        <DocumentProperties xmlns=""urn:schemas-microsoft-com:office:office"">
                            <Author>MSADMIN</Author>
                            <LastAuthor>MSADMIN</LastAuthor>
                            <Created>2011-07-12T23:40:11Z</Created>
                            <Company>Microsoft</Company>
                            <Version>12.00</Version>
                        </DocumentProperties>
                        <ExcelWorkbook xmlns=""urn:schemas-microsoft-com:office:excel"">
                            <WindowHeight>6600</WindowHeight>
                            <WindowWidth>12255</WindowWidth>
                            <WindowTopX>0</WindowTopX>
                            <WindowTopY>60</WindowTopY>
                            <ProtectStructure>False</ProtectStructure>
                            <ProtectWindows>False</ProtectWindows>
                        </ExcelWorkbook>
                        <Styles>
                            <Style ss:ID=""Default"" ss:Name=""Normal"">
                                <Alignment ss:Vertical=""Bottom""/>
                                <Borders/>
                                <Font ss:FontName=""Calibri"" x:Family=""Swiss"" ss:Size=""11"" ss:Color=""#000000""/>
                                <Interior/>
                                <NumberFormat/>
                                <Protection/>
                            </Style>
                            <Style ss:ID=""s62"">
                                <Font ss:FontName=""Calibri"" x:Family=""Swiss"" ss:Size=""11"" ss:Color=""#000000""
                                    ss:Bold=""1""/>
                            </Style>
                        </Styles>
                        <Worksheet ss:Name=""Sheet1"">
                            <Table ss:ExpandedColumnCount=""" + (properties.Count() + 1) + @""" ss:ExpandedRowCount=""" + (list.Count() + 1) + @""" x:FullColumns=""1""
                                x:FullRows=""1"" ss:DefaultRowHeight=""15"">
                                " + rowData.ToString() +@"
                            </Table>
                            <WorksheetOptions xmlns=""urn:schemas-microsoft-com:office:excel"">
                                <PageSetup>
                                    <Header x:Margin=""0.3""/>
                                    <Footer x:Margin=""0.3""/>
                                    <PageMargins x:Bottom=""0.75"" x:Left=""0.7"" x:Right=""0.7"" x:Top=""0.75""/>
                                </PageSetup>
                                <Print>
                                    <ValidPrinterInfo/>
                                    <HorizontalResolution>300</HorizontalResolution>
                                    <VerticalResolution>300</VerticalResolution>
                                </Print>
                                <Selected/>
                                <Panes>
                                    <Pane>
                                        <Number>3</Number>
                                        <ActiveCol>2</ActiveCol>
                                    </Pane>
                                </Panes>
                                <ProtectObjects>False</ProtectObjects>
                                <ProtectScenarios>False</ProtectScenarios>
                            </WorksheetOptions>
                        </Worksheet>
                        <Worksheet ss:Name=""Sheet2"">
                            <Table ss:ExpandedColumnCount=""1"" ss:ExpandedRowCount=""1"" x:FullColumns=""1""
                                x:FullRows=""1"" ss:DefaultRowHeight=""15"">
                            </Table>
                            <WorksheetOptions xmlns=""urn:schemas-microsoft-com:office:excel"">
                                <PageSetup>
                                    <Header x:Margin=""0.3""/>
                                    <Footer x:Margin=""0.3""/>
                                    <PageMargins x:Bottom=""0.75"" x:Left=""0.7"" x:Right=""0.7"" x:Top=""0.75""/>
                                </PageSetup>
                                <ProtectObjects>False</ProtectObjects>
                                <ProtectScenarios>False</ProtectScenarios>
                            </WorksheetOptions>
                        </Worksheet>
                        <Worksheet ss:Name=""Sheet3"">
                            <Table ss:ExpandedColumnCount=""1"" ss:ExpandedRowCount=""1"" x:FullColumns=""1""
                                x:FullRows=""1"" ss:DefaultRowHeight=""15"">
                            </Table>
                            <WorksheetOptions xmlns=""urn:schemas-microsoft-com:office:excel"">
                                <PageSetup>
                                    <Header x:Margin=""0.3""/>
                                    <Footer x:Margin=""0.3""/>
                                    <PageMargins x:Bottom=""0.75"" x:Left=""0.7"" x:Right=""0.7"" x:Top=""0.75""/>
                                </PageSetup>
                                <ProtectObjects>False</ProtectObjects>
                                <ProtectScenarios>False</ProtectScenarios>
                            </WorksheetOptions>
                        </Worksheet>
                    </Workbook>";

        System.Diagnostics.Debug.Print(StartTime.ToString() + " - " + DateTime.Now);
        System.Diagnostics.Debug.Print((DateTime.Now - StartTime).ToString());

        string attachment = "attachment; filename=Report.xml";
        HttpContext.Current.Response.ClearContent();
        HttpContext.Current.Response.AddHeader("content-disposition", attachment);
        HttpContext.Current.Response.Write(sheet);
        HttpContext.Current.Response.ContentType = "application/ms-excel";
        HttpContext.Current.Response.End();

    }