Reading and Writing Files

Reading and Writing Files:
Reading and writing files in C# is very easy. For reading and writing files in C# you have to include a namespace in your application that is System.IO. This namespace has classes that are used for reading and writing files.                                                                                                          

StreamReader          For reading data from files
StreamWriter           For writing data into the files
Reading data form Files:
Now lets look at an example which reads a file and calculates number of lines,words,characters and number of asteriks and displays the result after closing the file.Data is read character by character.Read() method returns int value so this is converted to char data type.
    class Program
    {
       
        public void OpenFile()
        {
            StreamReader sr;
         
            int words = 0, lines = 0, charc = 0, stars = 0;
            char read;
            string Filepath = @"F:\Antivirus\My Documents\ASSEMBLY ALGOS\4proc.asm";

            sr = new StreamReader(Filepath);
            while (sr.Peek() != -1)
            {
                read = (char)sr.Read();
                charc++;
                if (read == '*')
                    stars++;
                else if (read == ' ')
                    words++;
                else if (read == '\n')
                    lines++;
            }
            sr.Close();
           
            Console.WriteLine("Number of lines are {0} ",lines.ToString());
            Console.WriteLine("Number of words are {0} ",words.ToString());
            Console.WriteLine("Number of characters are {0} ",charc.ToString());
            Console.WriteLine("Number of stars are {0} ", stars.ToString());
         
        }
        static void Main(string[] args)
        {
            Program obj = new Program();
            obj.OpenFile();
        }
       }
Writing Data To Files:
   class Program
    {
         
        public void WriteFile()
        {
            StreamWriter sw;
         
           
            string Filepath = @"F:\abc.txt";

           sw = new StreamWriter(Filepath);
           sw.WriteLine("*********Starting to write*********");  
           sw.WriteLine("My name is Mairaj Ahmed Minhas");
           sw.WriteLine("This is first line ");
           sw.WriteLine("Writing data to file");
           sw.WriteLine("Three lines are written ");
           sw.WriteLine("************Finished******************");
           sw.Close();
            Console.WriteLine("File written");
          
        }
static void Main(string[] args)
        {
            Program obj = new Program();
           
            obj.WriteFile();
        }
}
You must close the file after you have finished reading or writing the file. While writing a file if you do not close that file no data will be written.

Comments

Post a Comment

Popular posts from this blog

Using Progress Bar In C#

Image
Using Progress Bar in C#: Progress Bar is very commonly used control in many applications to display the progress of task being performed. Progress Bar is displayed when copying files, deleting files or installing some software. How to use Progress Bar: ·          Start New Windows Form Application. ·          Go to Toolbox. ·          Select Progress Bar and Drag it to your Form. To make Progress Bar working you need to know some properties of Progress Bar Progress Bar.Maximum: Defines how long it should run Progress Bar.Step: Defines how much it should increase current position of Progress Bar. Progress Bar.Style: How should it look like? There is also a very basic method which is used to run Progress Bar properly. Progress Bar.PerformStep() Let’s see an example. In this example we will copy files and folders from one location to another and show the progress bar wh...
Read more

Get elements by class name in javascript

To get elements using class name we use getElementsByClassName method available with document object. This method takes name of class an argument.  It returns array of elements because more than one element(s) can have same class. < input type ="button" value ="Get By Class" onclick =" GetByClassName() " /> < div id ="myDiv" class ="myClass">     This is a div </ div > < script type ="text/javascript">   function GetByClassName() {         var elements = document.getElementsByClassName( "myClass" );         if (elements.length > 0) {             alert(elements[0].innerHTML);         }     else       alert( "No matching element found" );    }   </ script >
Read more

Jquery serer side datatables in asp.net

In this post we will learn how we can implement jquery   server side datatables in asp.net mvc application. We need to add datatables library to our page, we can add references of libray from datatables <a href="https://datatables.net/" target="_blank">website</a>. We need to create an html table on which we will apply datatable. <table class="table table-striped table-bordered table-hover table-checkable order-column dataTable" id="tblInventoryItems">   <thead>     <tr>       <th>Item Name</th>       <th>Item Price</th>       <th>Item Quantity</th>       <th></th>     </tr>   </thead>   <tbody></tbody> </table> Then we need the code which will apply the datatable to above html table. Below is the code to apply datatable $("yourtableid").DataTable({         "p...
Read more