From [the docs](https://docs.microsoft.com/en-us/dotnet/api/system.io.directory.enumeratefiles#System_IO_Directory_EnumerateFiles_System_String_System_String_System_IO_SearchOption_):

&gt; The EnumerateFiles and GetFiles methods differ as follows: When you use EnumerateFiles, you can start enumerating the collection of names before the whole collection is returned; when you use GetFiles, you must wait for the whole array of names to be returned before you can access the array. Therefore, when you are working with many files and directories, EnumerateFiles can be more efficient.

So basically, `EnumerateFiles` returns an `IEnumerable` which can be lazily evaluated somewhat, whereas `GetFiles` returns a `string[]` which has to be fully populated before it can return.

`EnumerateFiles` returns `IEnumerable&lt;string&gt;` and that implies deferred execution. It is only available in .net 4 and up. 

As the File system is notoriously slow (especially for large folders) the deferred execution can be a real bonus for sequential processing.  Depending on lots of other factors. 


When using EnumerateFiles, all speed is lost if you are then using `.Last`.  This makes sense of course, because to get to the last file, it will need to enumerate all files, then grab the last one.

However, using `.First` or `.FirstOrDefault` becomes very fast, because it simply grabs the first item and moves on.

I&#39;m working on an ios game that&#39;s targeting as a minimum the 3gs. We are using HD assets for retina display devices (iphone 4, ipod touch 4th gen).

Memory wise, Ipod Touch 4th gen seems to be the most constraint device for us since it has the same amount of RAM (256 compared to Iphone 4&#39;s 512) as 3gs but we&#39;re using HD assets on it. The app used to crash when trying to load 100-110mb of ram but now that we&#39;re down to 70MB, we&#39;ve never had loading crash.

After lots of searching around, there seems to be no official hard limit so how should we go about knowing what memory budget to use to be safe?  We want to be able to give the artists a budget they can use without memory worries for each map.

ios app maximum memory budget

I have a couple of gem files which I install via `gem install xx.gem`.  Can I tell Bundler to use them?  Or do I have to specify the source path?

How do I specify local .gem files in my Gemfile?

What is the difference between `Directory.EnumerateFiles` vs `GetFiles`?

Obviously one returns an array and the other return Enumerable.

Anything else?

What is the difference between Directory.EnumerateFiles vs Directory.GetFiles?

What is the difference between <code>Directory.EnumerateFiles</code> vs <code>GetFiles</code>?
Obviously one returns an array and the other return Enumerable.
Anything else?

I have an `IEnumerable&lt;TravelDetails&gt;` and I am trying to add the vales in the `for`-loop to a `List&lt;TravelDetails&gt;`. I keep getting the errors. 

&gt;Error	15	Argument 1: cannot convert from &#39;System.Collections.Generic.List&lt;TrafficCore.DataObjects.TripDetails&gt;&#39; to &#39;TrafficCore.DataObjects.TripDetails&#39;	C:\TrafficNew\TI 511-Web\Traffic 2.0\511Traffic\511Traffic\Models\DrivingTime.cs	

My code is

    List&lt;TripDetails&gt; tripDetailsCollection = new List&lt;TripDetails&gt;();
    foreach (DrivingTimeRoute dtr in dtRoutes)
    {
        foreach (Trip trip in dtr.Trips)
        {
            foreach (TripPathLink tpl in trip.TripPathLinks)
            {
                tplCollection.Add(tpl);
            }
            IEnumerable&lt;TripDetails&gt; tripDetails = //long Linq-to-Sql here
            List&lt;TripDetails&gt; td = tripDetails.ToList();
            tripDetailsCollection.Add(td); // &lt;&lt;&lt; Error here
        }
    }

Can some one help me with this.  
Thanks,
Pawan


Adding List&lt;t&gt;.add() another list

I would like to know a simple algorithm to check if the given instance of `datetime` lies between another two instances in `C#`.

**Note:**

I skimmed though this https://stackoverflow.com/questions/2634127/how-do-i-check-if-a-given-datetime-object-is-between-two-datetimes and it was for python and many more for php. Most of the other questions were regarding difference between the two.

**Details:**

I am more specific about the time, date does not matter to me. For example i got `DataBase` entry for a staff who works between `10:00` Am - `9:00` Pm and I would like to know which staff is engaged in class at the given time like `2:00 Pm`. Now this would return me the staff&#39;s details who are engaged at this time.

**Edit**

After accepting the answer(been more than year back), i realized i had incorrectly described the problem. But all i think that was to be done back then was to do date and time comparison. So answers by both Jason and VikciaR work. 

Check if datetime instance falls in between other two datetime objects

i was reading about WCF security implementations and found out that there are 2 types of security:
    `Transport Mode and Message Mode (or both)`

If i used HTTPS for Transport Mode, is it more secured if i used Message security also? i am asking this because what i understand is as follows:

https uses SSL protocol which encrypts messages... so why should i add Message Security and encrypt the SSL encrypted message? or am i misunderstanding stuff?

WCF Transport vs Message

I cannot see a app.config file generated for a class library by the VS2008 wizard. In my research I found that in an application only one app.config exists. 

Is it a bad thing to add an app.config manually to a class library or are there any other methods which will serve the purpose of an app.config in class library?

I need to store log4net config information inside the app.config file.


app.config for a class library

I have got a combo box with items source attached using simple binding. Is there any way to refresh this binding once combo box is loaded?

How to force a WPF binding to refresh?

To throw exceptions, I usually use built-in exception classes, e.g. `ArgumentNullException` and `NotSupportedException`. However, sometimes I need to use a custom exception and in that case I write:

    class SlippedOnABananaException : Exception { }
    class ChokedOnAnAppleException : Exception { }

and so on. Then I throw and catch these in my code. But today I came across the `ApplicationException` class - should I be using that instead? What&#39;s it for?

It does seem inefficient to have lots of effectively identical Exception classes with different names (I don&#39;t usually need any individual functionality). But I dislike the idea of catching a generic `ApplicationException` and having to use extra code to determine what the error was.

Where should `ApplicationException` fit in with my code?

What is ApplicationException for in .NET?

What is the URL for NuGet Gallery to access (nuget.org) from VS2010 
via Package Manager Console? I tried to use the Web site URL 
(http://nuget.org/List/Packages) but it didn&#39;t work.

What is the URL for NuGet Gallery to access (nuget.org) from VS2010?

In C# the method `Math.Ceiling` returns a `double` value. Why does it not return `int`? 

Why Math.Ceiling returns double?

I have created a class Person that looks like this: 

    public class Person
    {
        public enum GenderType
        {
            Female, 
            Male
        }

        public string Name
        {
            get; set;
        }

        public GenderType? Gender
        {
            get; set;
        }
    }

Next, I created data template that is going to present objects of type Person.  
Here&#39;s XAML code: 

    &lt;DataTemplate 
        x:Key=&quot;personTemplate&quot; 
        DataType=&quot;{x:Type model:Person}&quot;&gt;
      &lt;StackPanel&gt;
        &lt;RadioButton 
            Content=&quot;Female&quot; 
            IsChecked=&quot;{Binding Path=Gender, 
                        Converter={StaticResource genderConverter}, 
                        ConverterParameter=???}&quot;/&gt;
        &lt;RadioButton 
            Content=&quot;Male&quot; 
            IsChecked=&quot;{Binding Path=Gender, 
                        Converter={StaticResource genderConverter}, 
                        ConverterParameter=???}&quot;/&gt;
        &lt;RadioButton 
            Content=&quot;Not specified&quot; 
            IsChecked=&quot;{Binding Path=Gender, 
                        Converter={StaticResource genderConverter}, 
                        ConverterParameter=???}&quot;/&gt;
      &lt;/StackPanel&gt;
    &lt;/DataTemplate&gt;

Of course the `???`s in the code won&#39;t work :) The problem is that I want to create a `genderConverter` converter which will compare the given value, i.e. `personObject.Gender`, against the given `Person.GenderType` value provided in the parameter and return `true` if the values match. 

I don&#39;t know how to make the converter parameter pass `Person.GenderType.Female`, `Person.GenderType.Male` and `null`, for the first, second and third radio button, respectively.

 How to pass specific value to the converter parameter?

I need to create a list with all names of the files in a folder.

For example, if I have:

    000.jpg
    012.jpg
    013.jpg

I want to store them in a `ArrayList` with `[000,012,013]` as values.

What&#39;s the best way to do it in Java ?

PS: I&#39;m on Mac OS X

Getting the filenames of all files in a folder

I have hundreds of directories and files in one directory.

What is the best way deleting only directories (no matter if the directories have anything in it or not, just delete them all)

Currently I use `ls -1 -d */`, and record them in a file, and do `sed`, and then run it. It rather long way. I&#39;m looking for better way deleting only directories

How to delete only directories and leave files untouched

I have a directory of pictures that I want to loop through and do some file calculations on. It might just be lack of sleep, but how would I use PHP to look in a given directory, and loop through each file using some sort of for loop?

Thanks!

Loop code for each file in a directory

I know `du -sh` in common Linux filesystems. But how to do that with HDFS?

The way to check a HDFS directory&#39;s size?

1. I need to write a function which when given the path of a folder 
scans the files rooted at that folder. 
2. And then I need to display the directory structure at that folder. 

I know how to do 2 (I am going to use jstree to display it in the browser). 

How to perform file system scanning

How can I print 0x0a, instead of 0xa using cout?

    #include  &lt;iostream&gt;
    
    using std::cout;  
    using std::endl;  
    using std::hex;
    
    int main()  
    {  
        cout &lt;&lt; hex &lt;&lt; showbase &lt;&lt; 10 &lt;&lt; endl;  
    }


How can I print 0x0a instead of 0xa using cout?

I need to read a large text file of around 5-6 GB line by line using Java.

How can I do this quickly?


How can I read a large text file line by line using Java?

I&#39;ve generally heard that production code should avoid using Lazy I/O. My question is, why? Is it ever OK to use Lazy I/O outside of just toying around? And what makes the alternatives (e.g. enumerators) better?

What&#39;s so bad about Lazy I/O?

I have read in [wikipedia][1] that *Decorator pattern* is used for *.Net* and *Java IO* classes.

Can anybody explain how this is being used? And what is the benefit of it with a possible example?

There is an example of *Windows forms* on wikipedia but I want to know how it happens with *Java IO* classes.

  [1]: http://en.wikipedia.org/wiki/Decorator_pattern

Use Cases and Examples of GoF Decorator Pattern for IO

I am sure this is an easy one; I just couldn&#39;t find the answer *immediately* from Google.

I know I could do this (right?):

	text = &quot;&quot;
	File.open(path).each_line do |line|
		text += line
	end

	# Do something with text

But that seems a bit excessive, doesn&#39;t it? Or is that the way one would do it in Ruby?

Content Type	Original Author	Original Content on Stackoverflow
Question	DarthVader	View Question on Stackoverflow
Solution 1 - C#	Daniel DiPaolo	View Answer on Stackoverflow
Solution 2 - C#	Henk Holterman	View Answer on Stackoverflow
Solution 3 - C#	Skotte	View Answer on Stackoverflow

What is the difference between Directory.EnumerateFiles vs Directory.GetFiles?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

How do I specify local .gem files in my Gemfile?

ios app maximum memory budget

Attributions