C# ASP.NET MVC-如何检查ftp服务器上是否存在文件

我正在开发一个ASP.NETMVC5.1网站，如果它存在于ftp服务器（CDN）中，我需要显示一张图片。Foldername和filename与规则绑定，因此我事先就知道它们。如果此文件不存在，我需要显示一条消息

如何检查此文件是否存在

没有帮助，因为我需要检查文件是否存在于远程服务器上而不是本地文件夹上。

请尝试以下代码

  string destination = "ftp://something.com/";
    string file = "test.jpg";
    string extention = Path.GetExtension(file);
    string fileName = file.Remove(file.Length - extention.Length);
    string fileNameCopy = fileName;
    int attempt = 1;

    while (!CheckFileExists(GetRequest(destination + "//" + fileNameCopy + extention)))
    {
        fileNameCopy = fileName + " (" + attempt.ToString() + ")";
        attempt++;
    }

    // do your upload, we've got a name that's OK
}

private static FtpWebRequest GetRequest(string uriString)
{
    var request = (FtpWebRequest)WebRequest.Create(uriString);
    request.Credentials = new NetworkCredential("", "");
    request.Method = WebRequestMethods.Ftp.GetFileSize;

    return request;
}

private static bool checkFileExists(WebRequest request)
{
    try
    {
        request.GetResponse();
        return true;
    }
    catch
    {
        return false;
    }
}

请尝试以下代码

  string destination = "ftp://something.com/";
    string file = "test.jpg";
    string extention = Path.GetExtension(file);
    string fileName = file.Remove(file.Length - extention.Length);
    string fileNameCopy = fileName;
    int attempt = 1;

    while (!CheckFileExists(GetRequest(destination + "//" + fileNameCopy + extention)))
    {
        fileNameCopy = fileName + " (" + attempt.ToString() + ")";
        attempt++;
    }

    // do your upload, we've got a name that's OK
}

private static FtpWebRequest GetRequest(string uriString)
{
    var request = (FtpWebRequest)WebRequest.Create(uriString);
    request.Credentials = new NetworkCredential("", "");
    request.Method = WebRequestMethods.Ftp.GetFileSize;

    return request;
}

private static bool checkFileExists(WebRequest request)
{
    try
    {
        request.GetResponse();
        return true;
    }
    catch
    {
        return false;
    }
}

请尝试以下代码

  string destination = "ftp://something.com/";
    string file = "test.jpg";
    string extention = Path.GetExtension(file);
    string fileName = file.Remove(file.Length - extention.Length);
    string fileNameCopy = fileName;
    int attempt = 1;

    while (!CheckFileExists(GetRequest(destination + "//" + fileNameCopy + extention)))
    {
        fileNameCopy = fileName + " (" + attempt.ToString() + ")";
        attempt++;
    }

    // do your upload, we've got a name that's OK
}

private static FtpWebRequest GetRequest(string uriString)
{
    var request = (FtpWebRequest)WebRequest.Create(uriString);
    request.Credentials = new NetworkCredential("", "");
    request.Method = WebRequestMethods.Ftp.GetFileSize;

    return request;
}

private static bool checkFileExists(WebRequest request)
{
    try
    {
        request.GetResponse();
        return true;
    }
    catch
    {
        return false;
    }
}

请尝试以下代码

  string destination = "ftp://something.com/";
    string file = "test.jpg";
    string extention = Path.GetExtension(file);
    string fileName = file.Remove(file.Length - extention.Length);
    string fileNameCopy = fileName;
    int attempt = 1;

    while (!CheckFileExists(GetRequest(destination + "//" + fileNameCopy + extention)))
    {
        fileNameCopy = fileName + " (" + attempt.ToString() + ")";
        attempt++;
    }

    // do your upload, we've got a name that's OK
}

private static FtpWebRequest GetRequest(string uriString)
{
    var request = (FtpWebRequest)WebRequest.Create(uriString);
    request.Credentials = new NetworkCredential("", "");
    request.Method = WebRequestMethods.Ftp.GetFileSize;

    return request;
}

private static bool checkFileExists(WebRequest request)
{
    try
    {
        request.GetResponse();
        return true;
    }
    catch
    {
        return false;
    }
}

---

这是您的示例问题：这是您的示例问题：这是您的示例问题：这是您的示例问题：谢谢，我也会在需要上传文件时使用此选项。谢谢，我也会在需要上传文件时使用此选项。谢谢，如果我需要上传文件，我也会用这个。谢谢，如果我需要上传文件，我也会用这个。