Description
Homework 3
1. Download and install an IDE for C# for your platform, e.g. Visual Studio.
2. Take “A Tour of the C# Language”: https://docs.microsoft.com/en-us/dotnet/articles/csharp/
tour-of-csharp
3. Read the “Introduction to LINQ Queries (C#)”: https://docs.microsoft.com/en-us/dotnet/
articles/csharp/programming-guide/concepts/linq/introduction-to-linq-queries
4. Get a LINQ cheat sheet, e.g. the one that I shared in the Lecture Notes Repository.
Lab Assignment 3
Overview
In this lab, you will use C# and LINQ to iterate files, to query, group and order data, and to
create an XML document based on that data.
Implementation
You must follow these implementation guidelines:
1. Create a C# console application.
This application has two command line arguments: A path to a folder and a name for a
HTML report output file. The application collects all files with the same extension (converted
to lower case) and determines for each extension, i.e. file type, the number of files and the
total size of all files of this type.
2. Implement a class with the following 4 static functions:
static IEnumerable
Enumerate all files in a given folder recursively including the entire sub-folder hierarchy. You
can use System.IO.Directory. You could use the generator pattern (yield keyword) to
implement the iterator.
static string FormatByteSize(long byteSize)
Format a byte size in human readable form. Use the following units: B, kB, MB, GB, TB, PB,
EB, and ZB where 1kB = 1000B. The numerical value should be greater or equal to 1, less
than 1000 and formatted with 2 fixed digits after the decimal point, e.g. 1.30kB.
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static XDocument CreateReport(IEnumerable
Create a HTML document containing a table with three columns: “Type”, “Count”, and “Size”
for the file name extension (converted to lower case), the number of files with this type, and
the total size of all files with this type, respectively.
You can use System.IO.FileInfo to get the size of a file with a given path.
Sort the table by the byte size value of the “Size” column in descending order.
Use your FormatByteSize function to format the value printed in the “Size” column.
Implement this function using LINQ queries making use of group by and orderby.
Use the System.Xml.Linq.XElement constructor to functionally construct the XML
document.
public static void Main(string[] args)
Take two command line arguments. The first value is the path of the input folder and the
second the path of the HTML report output file. Call the functions above to create the report
file.
3. Do not use lists or arrays to store intermediate data. Instead you should use iterators to
process the sequences of data element by element without storing it all.
Testing Your Code
Demonstrate that your console application works correctly by creating a report file from some
folder on your machine.
Deliverable
1. You can work on this assignment in a group of up to 6 students.
2. At the due date you will take a brief quiz to test your understanding of the assignment.
3. During the lab session on the due date each group will do
1. A brief demonstration of the running applications.
2. A presentation explaining the source code.
4. Due date: Tuesday 17 November 2020 at the beginning of lecture.
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