Description:
About Classes used -
#1: StreamReader class provides an access to read the data from Stream such as Text File.
#2: StreamWriter class provides an access to write the data from Stream such as Text File.
Namespace Required - System.IO, System.Diagnostics
Controls Used-
1. TextBox Control (txtInput, txtOutput)
2. Button Control (btnSelect, btnCreatePDF)
Here I implemented the Code for copying and appending Text Document to another Text Document.
The Code:
1. Variable Declarations
StreamReader rdr; //StreamReader Object for Reading File
StreamWriter wrt; //StreamWriter Object for Writing File
Listing 1
2. Select the Text Input & Output File (code both for “Select” Button).
//Select File with OpenFileDialog Box
String SelectFile(TextBox t)
{
using (OpenFileDialog file = new OpenFileDialog())
{
file.Filter = "Only Text Documents|*.txt";
//Show the Dialog Box & Select the File
file.ShowDialog();
//Return the selected File Name as String
return file.FileName;
}
}
Listing 2
3. Copy Data from one to another Text File (code for “Copy All” Button).
//Input File
rdr = new StreamReader(txtInput.Text);
//Output File
wrt = new StreamWriter(txtOutput.Text, false);
//Copy All Data From Input file to Output file
wrt.Write(rdr.ReadToEnd().ToString());
//Close the StreamWriter instance
wrt.Close();
MessageBox.Show("File Copied Successfully....");
//Open the Output file
Process.Start(txtOutput.Text);
Listing 3
4. Append Data from one to another Text File (code for “Append All” Button).
//Input File
rdr = new StreamReader(txtInput.Text);
//Output File
wrt = new StreamWriter(txtOutput.Text, true);
//Append All Data From Input file to Output file
wrt.WriteLine(Environment.NewLine +
"--------------- Appended File Start from here ---------------" +
Environment.NewLine);
wrt.Write(rdr.ReadToEnd().ToString());
//Close the StreamWriter instance
wrt.Close();
MessageBox.Show("File Appended Successfully....");
//Open the Output file
Process.Start(txtOutput.Text);
Listing 3
5. Now execute the Application and see the result (Figure 1).
Intended Result:
![New Picture.png]()
Figure 1
Summary:
In this piece of writing, using C# environment, we have seen basic stream input/output operation for copying & appending text files using StreamWriter & StreamReader classes.