C# download file from url check if file exists

WriteLine "And" ; sw. Exists String Method The Directory. Exists is Determines whether the given path refers to an existing directory on disk.

Syntax public static bool Exists string path ; Example. View All. Check if a File Exists in C. Dinesh Beniwal Updated date Jan 07, This method used to Day and night are parts of a Boolean condition. The Exists method should not be used for path validation, this method merely checks if the file specified in path exists file.

The File Class is Provides static methods for the creation, copying, deletion, moving, and opening of a single file, and aids in the creation of FileStream objects. The following example demonstrates how to use the File class to check whether a file exists in File class, and depending on the result, either create a new file and write to it or open the existing file and read from it.

The Directory. This example takes an array of file or directory names on the command line, determines what kind of name it is, and processes it appropriately. The path parameter is permitted to specify relative or absolute path information.

Only the response headers will be returned, even if the resource exists. Of course, if you want to download the resource if it exists it would most likely be more efficient to send a GET request instead by not setting the Method property to "HEAD" , or by using the WebClient class. If you want to download the resource, and it exists, it would be more efficient to send a GET request instead by not setting the Method property to "HEAD" or by using the WebClient class. If you are using a web address http, ftp etc you are better off using WebClient - you will get a WebException if it doesn't exist.

WebRequest will waiting long time ignore the timeout user set because not set proxy, so I change to use RestSharp to do this. Thanks for all answers. And I would like to add my implementation which includes default state when we get errors, for specific cases like mine. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Asked 11 years, 11 months ago. Active 5 months ago.

Viewed 88k times. I know I can locally, on my filesystem, check if a file exists: if File. Marc, why would using a custom class be better in this case? This email is in use. Do you need your password? Submit your solution! When answering a question please: Read the question carefully. Understand that English isn't everyone's first language so be lenient of bad spelling and grammar. If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem.

Insults are not welcome. Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question. Let's work to help developers, not make them feel stupid. Related Questions. Append a column to existing csv file. It should have thrown instead.

Calendar Software Calendar Software 91 1 1 bronze badge. Yes, perhaps you can refine the solution by differentiating between different cases TCP connection failure - host refuses connection, 5xx - Something fatal happened, - Resource not found etc. Very good point David! That would give us more detailed feedback so that we could handle the error more astutely. My point is that there are several layers to this onion, each of which can throw a wrench into the works.

IMHO a good design should be able to discriminate between the different failure conditions to provide informative feedback and usable diagnostics. Try this Make sure you use System.

Praveen Dasare Praveen Dasare 41 1 1 bronze badge. Please add some explanation to your answer. Code-only answers tend to be confusing and not helpful to future readers and can attract downvotes that way. Zain Ali Zain Ali That might be useful for checking if a host exists. The question is obviously not worried about whether or not the host exists. It is concerned with handling a bad HTTP path given the host is known to exist and be fine. I have always found Exceptions are much slower to be handled.

Perhaps a less intensive way would yeild a better, faster, result? GetAsync uri. Accepted: return true; case HttpStatusCode. Rusty Nail Rusty Nail 2, 3 3 gold badges 28 28 silver badges 52 52 bronze badges. David Taylor David Taylor 1, 20 20 silver badges 23 23 bronze badges. Marc, you absolutely are correct. I intentionally avoided get into the "class of error" concept e.

Even handling the standard codes , , , etc is much better than ignoring the codes completely. No, this method doesn't check whether the url is really accessible.

It even returns true when Uri. IsWellFormedUriString " Create url ; request. Head, url ; if response. Daniel W. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.