如何使用 c# 在 Windows 8 应用程序中打开 pdf 文件?

如何在 windows 8 应用程序中阅读 pdf 文件.在我的 windows 8 应用程序中如何打开 pdf 文件.

How to read the pdf files in windows 8 app .In my windows 8 application how to open the pdf files .

在清单文件中，我编写了以下代码.

In manifest file i wrote the below code.

<Extensions>
        <Extension Category="windows.fileTypeAssociation">
          <FileTypeAssociation Name="pdf">
            <SupportedFileTypes>
              <FileType>.pdf</FileType>
            </SupportedFileTypes>
          </FileTypeAssociation>
        </Extension>
      </Extensions>

和背后的代码.

string imageFile = @"Images\DX730_EN.pdf";

           var file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(imageFile);

            if (file != null)
            {
                // Set the option to show the picker
                var options = new Windows.System.LauncherOptions();
                options.DisplayApplicationPicker = true;

                // Launch the retrieved file
                bool success = await Windows.System.Launcher.LaunchFileAsync(file, options);
                if (success)
                {
                    // File launched
                }
                else
                {
                    // File launch failed
                }
            }
            else
            {
                // Could not find file
            }

我无法打开pdf文件.请告诉我错误在哪里?

i could not able to open the pdf file.please tell me where is error?