/// <summary>
/// Check if the input is a valid url.
/// </summary>
/// <param name="url">Url to validate.</param>
/// <returns>
/// Returns input if it's a valid url. If the input is not a valid url, returns empty string.
/// </returns>
public static string CleanUrl(string url)
{
if (string.IsNullOrWhiteSpace(url))
{
return(string.Empty);
}
const string prefix = "http";
if (url.Substring(0, prefix.Length) != prefix)
{
url = prefix + "://" + url;
}
using (MyClient client = new MyClient())
{
client.HeadOnly = true;
try
{
client.DownloadString(url);
}
catch (WebException)
{
url = string.Empty;
}
return(url);
}
}
/// <summary>
/// Check if the input is a valid url.
/// </summary>
/// <param name="url"></param>
/// <returns>Returns input if it's a valid url. If the input is not a valid url, returns empty string.</returns>
public static string CleanUrl(string url)
{
if(string.IsNullOrWhiteSpace(url))
{
return string.Empty;
}
string prefix = "http";
if(url.Substring(0, prefix.Length) != prefix)
{
url = prefix + "://" + url;
}
using(var client = new MyClient())
{
client.HeadOnly = true;
try
{
client.DownloadString(url);
}
catch(WebException)
{
url = string.Empty;
}
return url;
}
}
/// <summary>
///
/// </summary>
/// <param name="url"></param>
/// <param name="brute"></param>
/// <returns></returns>
public static bool IsURLValid(string url, bool brute = false)
{
if (!brute)
{
Uri uri = null;
return(Uri.TryCreate(url, UriKind.Absolute, out uri));
}
else
{
// using MyClient from linked post
using (var client = new MyClient()
{
HeadOnly = true
})
{
try
{
var s1 = client.DownloadString(url);
// no error has occured so,
return(true);
}
catch
{
return(false);
}
}
}
}
/// <summary>
/// <see cref="https://stackoverflow.com/questions/924679/c-sharp-how-can-i-check-if-a-url-exists-is-valid"/>
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static bool UrlIsValid(string url)
{
try
{
using (var client = new MyClient())
{
client.HeadOnly = true;
client.DownloadString(url);
return(true);
}
}
catch
{
//either 404 or 503
return(false);
}
}
static void Main()
{
using (MyClient client = new MyClient())
{
client.HeadOnly = true;
string uri = "http://www.google.com";
byte[] body = client.DownloadData(uri); // note should be 0-length
string type = client.ResponseHeaders["content-type"];
client.HeadOnly = false;
// check 'tis not binary... we'll use text/, but could
// check for text/html
if (type.StartsWith(@"text/"))
{
string text = client.DownloadString(uri);
Console.WriteLine(text);
}
}
}
/// <summary>
/// <see cref="https://stackoverflow.com/questions/924679/c-sharp-how-can-i-check-if-a-url-exists-is-valid"/>
/// <seealso cref="https://www.c-sharpcorner.com/forums/c-sharp-webclient-throws-error-while-downloading-a-url-string"/>
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static bool UrlIsValid(string url)
{
try
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
using (var client = new MyClient())
{
client.HeadOnly = true;
client.DownloadString(url);
return(true);
}
}
catch (Exception x)
{
x.Data.Add("url", url);
//either 404 or 503
XLogger.Error(x);
return(false);
}
}
private static string GetWebContentCore5(string url)
{
string res = "";
try
{
using (MyClient client = new MyClient()) // WebClient class inherits IDisposable
{
//client.DownloadFile(url, @"C:\localfile.html");
// Or you can get the file content without saving it
res = client.DownloadString(url);
}
return(res);
}
catch (Exception x)
{
x.Data.Add("url", url);
throw;
}
}
private static string GetContent(String csvLink)
{
if (System.IO.File.Exists(csvLink))
return System.IO.File.ReadAllText(csvLink);
String content = "";
using (MyClient client = new MyClient())
{
client.HeadOnly = true;
string uri = csvLink;
byte[] body = client.DownloadData(uri); // note should be 0-length
string type = client.ResponseHeaders["content-type"];
client.HeadOnly = false;
// check 'tis not binary... we'll use text/, but could
// check for text/html
if (type.StartsWith(@"text/") || IsTextExtension(csvLink))
{
client.HeadOnly = false;
content = client.DownloadString(uri);
}
else
throw new Exception(@"Dokumentet skal være tekst-baseret. Se den gratis demo for hjælp");
}
return content;
}
private void toolStripMenuUpdate_Click(object sender, EventArgs e)
{
string currentVersionUrlTxt = _YameConst.Updateurl + _YameConst.Updatefilename;
using (var client = new MyClient())
{
string updateversion = client.DownloadString(currentVersionUrlTxt);
if (String.Empty != updateversion)
{
Version assemblyVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
string currentVersion = assemblyVersion.Major.ToString() + assemblyVersion.Minor.ToString() + assemblyVersion.Build.ToString();
string updateVersionFileUrl = _YameConst.Updateurl + _YameConst.Appname + "_" + updateversion + ".zip";
if (updateversion != currentVersion)
{
string message = "Update " + updateversion + " available !\r\n" + "\r\nVisit website for download ?";
DialogResult result = SMARTDIALOG.SmartDialog.Show(message, "V" + currentVersion, "Server found.", "Update found", "NO", "YES");
if(result == DialogResult.No) // Inverted button on frame ;)
System.Diagnostics.Process.Start(_YameConst.Helpurl + "#download");
}
else
{
SMARTDIALOG.SmartDialog.Show("Current version is up to date !", "V"+currentVersion, "Server found.", "No update found", "OK");
}
}
else
{
MessageBox.Show("Website unreachable!");
}
}
}
