Question

我有一个代码，它读取pdfpath并显示在新的popupwindow中，这是我的代码

string path = Request.QueryString["val"].ToString();
string extention = Path.GetExtension(path);
int len = extention.Length - 1;
string extwithoutdot = extention.Substring(1, len);

if (extwithoutdot.Equals("JPG") || 
    extwithoutdot.Equals("jpg") || 
    extwithoutdot.Equals("jpeg") || 
    extwithoutdot.Equals("JPEG"))
{
    extwithoutdot = "jpeg";
}
if (extwithoutdot.Equals("TIF") || extwithoutdot.Equals("tif"))
{
    extwithoutdot = "tiff";
}
if (extwithoutdot.Equals("GIF") || extwithoutdot.Equals("gif"))
{
    extwithoutdot = "gif";
}
if (extwithoutdot.Equals("BMP") || extwithoutdot.Equals("bmp"))
{
    extwithoutdot = "bmp";
}



string filetype = "";
if (extention.Equals(".pdf") || extention.Equals(".PDF"))
{
    extwithoutdot = "pdf";
    filetype = "PDF";
}

WebClient client = new WebClient();
//driveInfo.IsReady;
Byte[] buffer = client.DownloadData(path);

因设备未准备好而收到错误如何解决这个问题？

Answer 1

我知道这并没有回答你的问题（因为它的当前状态，我们无法诊断问题），但你的代码却在困扰我！你的if语句非常低效，可以用一个很好的switch块来重写：

//First make the string lowercase:
string extwithoutdot = extention.Substring(1, len).ToLower();

switch(extwithoutdot)
{
    case "jpg":
        extwithoutdot = "jpeg";
        break;

    case "tif":
        extwithoutdot = "tiff";
        break;

    default:
        //Don't need to do anything
}

webexception未通过usercode处理，ioexception - 查看pdf或图像文件时设备尚未就绪

1 个答案: