請教大大~
跑到這行時,一直轉圈圈,跑不出來,可能是哪裡出了問題,謝謝~
var xLocalContext = Bootstrap.bootstrap();

環境
VS2013 C# WebForm
W7
安裝x86LibreOffice
安裝x86LibreOffice的SDK (LibreOffice_6.4.2_Win_x64_sdk.msi)

加入參考
cli_basetypes.dll
cli_cppuhelper.dll
cli_oootypes.dll
cli_ure.dll
cli_uretypes.dll

protected void Button1_Click(object sender, EventArgs e)
{
    ConvertToPdfSdk(@"e:\result.xlsx", @"e:\result.pdf");
}
 /// <summary>
/// 匯出PDF
/// </summary>
/// <param name="inputFile">來源檔案路徑</param>
/// <param name="outputFile">匯出檔案路徑</param>
public static void ConvertToPdfSdk(string inputFile, string outputFile)
{
    if (ConvertExtensionToFilterType(Path.GetExtension(inputFile)) == null)
        throw new InvalidProgramException("Unknown file type for OpenOffice. File = " + inputFile);

    //Get a ComponentContext
    var xLocalContext =
        Bootstrap.bootstrap();
    //Get MultiServiceFactory
    var xRemoteFactory =
        (XMultiServiceFactory)
        xLocalContext.getServiceManager();
    //Get a CompontLoader
    var aLoader =
        (XComponentLoader)xRemoteFactory.createInstance("com.sun.star.frame.Desktop");
    //Load the sourcefile

    XComponent xComponent = null;
    try
    {
        xComponent = InitDocument(aLoader,
            PathConverter(inputFile), "_blank");
        //Wait for loading
        while (xComponent == null)
        {
            Thread.Sleep(1000);
        }

        // save/export the document
        SaveDocument(xComponent, inputFile, PathConverter(outputFile));
    }
    finally
    {
        if (xComponent != null) xComponent.dispose();
    }
}

/// <summary>
/// 文件初始化
/// </summary>
/// <param name="aLoader"></param>
/// <param name="file">來源檔案路徑</param>
/// <param name="target">目標檔案路徑</param>
/// <returns></returns>
private static XComponent InitDocument(XComponentLoader aLoader, string file, string target)
{
    var openProps = new PropertyValue[1];
    openProps[0] = new PropertyValue { Name = "Hidden", Value = new Any(true) };

    var xComponent = aLoader.loadComponentFromURL(
        file, target, 0,
        openProps);

    return xComponent;
}

/// <summary>
/// 儲存檔案
/// </summary>
/// <param name="xComponent">套件</param>
/// <param name="sourceFile">來源檔案路徑</param>
/// <param name="destinationFile">目標檔案路徑</param>
private static void SaveDocument(XComponent xComponent, string sourceFile, string destinationFile)
{
    var propertyValues = new PropertyValue[2];
    // Setting the flag for overwriting
    propertyValues[1] = new PropertyValue { Name = "Overwrite", Value = new Any(true) };
    //// Setting the filter name
    propertyValues[0] = new PropertyValue
    {
        Name = "FilterName",
        Value = new Any(ConvertExtensionToFilterType(Path.GetExtension(sourceFile)))
    };
    ((XStorable)xComponent).storeToURL(destinationFile, propertyValues);
}

/// <summary>
/// 檔案路徑字串格式
/// </summary>
/// <param name="file">檔案路徑</param>
/// <returns></returns>
private static string PathConverter(string file)
{
    if (string.IsNullOrEmpty(file))
        throw new NullReferenceException("Null or empty path passed to OpenOffice");

    return String.Format("file:///{0}", file.Replace(@"\", "/"));
}

/// <summary>
/// 對應檔案類型
/// </summary>
/// <param name="extension">副檔名</param>
/// <returns></returns>
public static string ConvertExtensionToFilterType(string extension)
{
    switch (extension)
    {
        case ".doc":
        case ".docx":
        case ".txt":
        case ".rtf":
        case ".html":
        case ".htm":
        case ".xml":
        case ".odt":
        case ".wps":
        case ".wpd":
            return "writer_pdf_Export";
        case ".xls":
        case ".xlsb":
        case ".xlsx":
        case ".ods":
            return "calc_pdf_Export";
        case ".ppt":
        case ".pptx":
        case ".odp":
            return "impress_pdf_Export";

        default:
            return null;
    }

ref
https://dotblogs.com.tw/WillianHsiaoDotNetBLog/2020/01/07/ExcelToPdf