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Reliable Directory.Exists using C#


Reliable Directory.Exists using C#

By : Dragnnight
Date : November 17 2020, 01:00 AM
should help you out You could try to create a DirectoryInfo object instead. The constructor should throw exceptions if the path is invalid or if the user does not have access. You would still have to check if it exists though.
code :
try
{
    var di = new DirectoryInfo(path);
    if(di.Exists)
    {
        //The directory exists
    }
    else
    {
        //The path is valid, but does not exist.
    }
}
catch(Exception e)
{
    //The path is invalid or user does not have access.
}


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nant directory::exists returns false even though directory exists

nant directory::exists returns false even though directory exists


By : user2768032
Date : March 29 2020, 07:55 AM
I hope this helps . I'm trying to check for if a directory exists as part of a NAnt script and getting a false negative. Here is the script fragment: , You must not use ${} in a nested way:
code :
<echo message="${backup.dir} --> ${directory::exists(backup.dir)}"/>
For a Ruby CLI, what is the most reliable way to change directory to users root/home directory?

For a Ruby CLI, what is the most reliable way to change directory to users root/home directory?


By : coder90
Date : March 29 2020, 07:55 AM
I wish did fix the issue. To summarize Avdi Grimm's screencast on the same subject,
If you're using a Ruby version greater than 1.9, the Dir module provides a method #home. However, this depends on the environment variable HOME set on the user's shell session. To reliably get the home dir, you should pass in the login name of the current user to the Dir.home command. Or, in code:
code :
# Works if HOME is set in the environment i.e., if "echo $HOME" returns the home directory
# when that command is run on the command-line
Dir.home     # => /Users/<username>, Works if HOME is set

# If the HOME environment variable is not set, you should explicitly pass in the username
# of the currently logged-in user
Dir.home(username)     # => /Users/<username>

# The current username can be obtained using
username = `whoami`

# or

require 'etc'
username = Etc.getlogin
ElasticSearch index exists not working / reliable

ElasticSearch index exists not working / reliable


By : Kiran Shetty
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , OK, I figured out a solution. Since the java client's calls are done asynchronously you have to use the variant which takes an action listener. The solution still gets a bit contrived though:
code :
// Inner class because it's just used to be thrown out of
// the action listener implementation to signal that the
// index exists
private class ExistsException extends RuntimeException {
}

public boolean exists() {
    logger.info(String.format("Verifying existence of index \"%s\"", indexName));
    IndicesExistsRequest request = new IndicesExistsRequest(indexName);
    try {
        adminClient.exists(request, new ActionListener<IndicesExistsResponse>() {
            public void onResponse(IndicesExistsResponse response) {
                if (response.isExists()) {
                    throw new ExistsException();
                }
            }
            public void onFailure(Throwable e) {
                ExceptionUtil.smash(e);
            }
        });
    }
    catch (ExistsException e) {
        return true;
    }
    return false;
}
Reliable check if a variable exists in R

Reliable check if a variable exists in R


By : Root Tn
Date : March 29 2020, 07:55 AM
To fix this issue I figured it out. It is a wrapper around try, which is itself a wrapper for tryCatch. Here is the function:
code :
#this tries to evaluate the expression and returns it, but if it does not work, returns the alternative value. It is simply a wrapper for trycatch. 
#This is similar to python's try except
#e.g.
#the_value=tryExcept(the_matrix[[1]][i,3],0)
#This will return the value of  the_matrix [[1]][i,3], unless it does not exist, in which case it will return zero

tryExcept <- function(expr,alternative)
{
    tryCatch(expr,error=function(e) alternative)
}
FileInfo.Exists not reliable with UNC path

FileInfo.Exists not reliable with UNC path


By : Daniel Hiberus
Date : March 29 2020, 07:55 AM
will be helpful for those in need You can't do this in a general sense, because as Ben mentions, you might not have ACLs to see if it exists. That being said, the best way to determine if a file exists (based on your scenario) is to attempt to open the file
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