How to replace characters in a string while looping?

Question

I would like to verify if a file exists on multiple servers. The only thing that's different on the servers is the number on the server, ex. Server1, Server2, Server3, etc.

How would I write a loop that replaces each number with the next highest number up until, say Server 10?

Here is what I have so far:

var fileLocation = @"\\Server1\documents\File.txt";
var newFileInfoTest = fileLocation.Replace("Server1", "Server2");

if (File.Exists(newFileInfoTest))
    txtTextBox.Text = "Server1 -- File copy successful.";
else
    txtTextBox.Text = "Server1 -- File copy unsuccessful";

There is no loop in your code example. Please provide the code you need help with. — dymanoid
– dymanoid, Commented Oct 4, 2019 at 17:43

littlerufe · Accepted Answer · 2019-10-04 21:47:00Z

3

"How would I write a loop that replaces each number with the next highest number up until, say Server 10?"

You can set the server name in a loop, using the loop iterator value as part of the server name

for(int i = 1; i <= 10; i++)
{
    txtTextBox.Text = File.Exists($@"\\Server{i}\documents\File.txt")
        ? $"Server{i} -- File copy successful."
        : $"Server{i} -- File copy unsuccessful";
}

Note that the code above will overwrite the txtTextBox.Text value on each iteration. You may instead want to capture all the statuses in the loop and then display them at the end:

txtTextBox.Text = string.Join(Environment.NewLine, Enumerable.Range(1, 10)
    .Select(i => File.Exists($@"\\Server{i}\documents\File.txt")
        ? $"Server{i} -- File copy successful."
        : $"Server{i} -- File copy unsuccessful."));

In the comments you asked:

"How would you do this if the file location was in a variable?"

One way to do this is to use a format string with a placeholder ({0}) where the number would go, and then use string.Format to fill in that placeholder inside the loop.

We can extract the server name from this string using string.Split on the \ character and grabbing the first item.

For example:

var serverPath = @"\\Server{0}\documents\File.txt";

txtTextBox.Text = string.Join(Environment.NewLine, Enumerable.Range(1, 10)
    .Select(i =>
    {
        var thisPath = string.Format(serverPath, i);
        var serverName = thisPath.Split(new[] { '\\' },
            StringSplitOptions.RemoveEmptyEntries).First();
        return File.Exists(thisPath)
            ? $"{serverName} -- File copy successful."
            : $"{serverName} -- File copy unsuccessful.";
    }));

edited Oct 4, 2019 at 21:47

answered Oct 4, 2019 at 17:46

littlerufe

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4 Comments

Pavel Anikhouski Over a year ago

Actually, I did the same:)

JM1 Over a year ago

Thanks @RufusL, this was what I was looking for. How would you do this if the file location was in a variable? Or would that be a different question to ask?

YankTHEcode Over a year ago

See my answer for the variable version.

littlerufe Over a year ago

I posted a sample that uses a variable to store the template for the server path, if that helps.

ssilas777 · Accepted Answer · 2019-10-04 22:17:49Z

1

You can do something like this, make sure your message will not get over write, you can use string builder instead of concatenation. hope you can get the logic

    var msg = string.Empty;
    for(int i = 1; i <  11; i++) { 
        var fileLocation = $"\\Server{i}\documents\File.txt";

         if (File.Exists(fileLocation))
         {
           msg += $"Server{i} -- File copy successful.";
         }
         else
         {
           msg += $"Server{i} -- File copy unsuccessful."; 
         }
    }

    txtTextBox.Text = msg;

edited Oct 4, 2019 at 22:17

answered Oct 4, 2019 at 17:48

ssilas777

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1 Comment

ssilas777 Over a year ago

@SQLPolice - Right, the first answer will be always in hurry!

Evik Ghazarian · Accepted Answer · 2019-10-04 17:48:46Z

0

Try this:

for (int i = 0; i < 11; i++){
 var fileLocation = $@"\\Server{i}\documents\File.txt";

 if (File.Exists(fileLocation))
    txtTextBox.Text = $"Server{i} -- File copy successful.";
 else
    txtTextBox.Text = $"Server{i} -- File copy unsuccessful";
 }
}

edited Oct 4, 2019 at 17:48

answered Oct 4, 2019 at 17:46

Evik Ghazarian

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Comments

YankTHEcode · Accepted Answer · 2019-10-04 17:59:23Z

0

"How would I write a loop that replaces each number with the next highest number up until, say Server 10?"

var numberofServers = 10;
for(int i =0; i <= numberOfServers; i++){
var fileLocation = $"\\Server{i}\\documents\\File.txt";

if(File.Exists(fileLocation)){
//Success
}    
else{
//UnSuccessful
}
}

answered Oct 4, 2019 at 17:59

YankTHEcode

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