尝试Aspose。
http://www.aspose.com/categories/.net-components/aspose.cells-for-.net/default.aspx
您可能还需要PDF组件，不确定他们现在是如何做到的。

你能简单地使用一些pdf打印机来做吗？

尝试使用免费解决方案（EpPlus）：https://github.com/EPPlusSoftware/EPPlus或电子表格https://spreadsheetlight.com/另一种方法：

static void ConvertFromStream()
    {

      
        // The conversion process will be done completely in memory.
        string inpFile = @"..\..\..\example.xml";
        string outFile = @"ResultStream.pdf";
        byte[] inpData = File.ReadAllBytes(inpFile);
        byte[] outData = null;

        using (MemoryStream msInp = new MemoryStream(inpData))
        {

            // Load a document.
            DocumentCore dc = DocumentCore.Load(msInp, new XMLLoadOptions());

            // Save the document to PDF format.
            using (MemoryStream outMs = new MemoryStream())
            {
                dc.Save(outMs, new PdfSaveOptions() );
                outData = outMs.ToArray();                    
            }
            // Show the result for demonstration purposes.
            if (outData != null)
            {
                File.WriteAllBytes(outFile, outData);
                System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile) { UseShellExecute = true });
            }
        }