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Console.OpenStandardInput Method in C# - GeeksforGeeks

Last Updated : 11 Jul, 2025

Console.OpenStandardInput Method is used to get the standard input stream. There are two overloads of OpenStandardInput method available in C# which are listed below:

• OpenStandardInput() Method
• OpenStandardInput(int32) Method

It is used to get the standard input stream. Make the object of

class and by using this method, the user can give the Input reference to that object. It creates a buffer which is used to take user input. This method can also be used to

the standard input stream after it has been changed by the

method.

public static System.IO.Stream OpenStandardInput ();

// C# program to illustrate the 
// OpenStandardInput() Method
using System;
using System.Text;
using System.IO;

class GFG {

    public static void Main()
    {

        // Stream Object declared and 
        // OpenStandardInput method is used
        Stream inputStream = Console.OpenStandardInput(); 
        byte[] bytes = new byte[50];
        int outputLength = inputStream.Read(bytes, 0, 50);
        char[] chars = Encoding.UTF7.GetChars(bytes, 0, outputLength); 
        Console.WriteLine(new string(chars));
    }
}

It is also used to get the standard input stream which is set to specified buffer size. The value passed in this method determines the size of the buffer. This method can also be used to

the standard input stream after it has been changed by the

method.

Syntax: public static System.IO.Stream OpenStandardInput (int bufferSize); Parameters: buffersize: It is the internal stream buffer size. Return Value: It returns the standard input stream. Exception: This method will give ArgumentOutOfRangeException if the buffersize is less than or equal to zero.

// C# program to illustrate the 
// OpenStandardInput(Int32) Method
using System;
using System.Text;
using System.IO;

class GFG {

    // Main Method
    public static void Main()
    {

        // Using the Method
        Stream inputStream = Console.OpenStandardInput(100);
        byte[] bytes = new byte[100];
        int outputLength = inputStream.Read(bytes, 0, 100);
        char[] chars = Encoding.UTF7.GetChars(bytes, 0, outputLength);
        Console.WriteLine(new string(chars));
    }
}

• https://learn.microsoft.com/en-us/dotnet/api/system.console.openstandardinput?view=netframework-4.7.2

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