C# Program to Get the Environment Variables Using Environment Class
Last Updated :
16 Nov, 2021
In C#, Environment Class provides information about the current platform and manipulates, the current platform. It is useful for getting and setting various operating system-related information. We can use it in such a way that it retrieves command-line arguments information, exit codes information, environment variable settings information, contents of the call stack information, and time since the last system boot in milliseconds information. By just using some predefined methods we can get the information of the Operating System using the Environment class and GetEnvironmentVariable() method is one of them. This method is used to find the environment variables. It is overloaded in two different ways:
1. GetEnvironmentVariable(String): This method is used to find the environment variables of the current process. It will find all the environment variables with their values. Always remember the name of the environment variable is case sensitive in macOS and Linux but in Windows, they do not case sensitive.
Syntax:
public static string? GetEnvironmentVariable (string varstring);
Where varstring parameter is of string type and it will represent the name of the environment variable.
Return: This method will return the name of the environment variable. Or return null when the environment variable is not found.
Exceptions: This method will throw the following exception:
- SecurityException: This exception occurs only when the caller does not have the given permission to perform this operation.
- ArgumentNullException: This exception occurs when the variable is null.
2. GetEnvironmentVariable(String, EnvironmentVariableTarget): This method is used to find the environment variables of the current process, or from the Windows OS registry key for the local machine or current user. Always remember the name of the environment variable is case sensitive in macOS and Linux but in Windows, they do not case sensitive.
Syntax:
public static string? GetEnvironmentVariable (string varstr, EnvironmentVariableTarget t);
This method will two parameters named varstr and t. Here, varstr represents the name of the environment variable and t represents the EnvironmentVariableTarget value.
Return: This method will return the name of the environment variable. Or return null when the environment variable is not found.
Exceptions: This method will throw the following exception:
- SecurityException: This exception occurs only when the caller does not have the given permission to perform this operation.
- ArgumentNullException: This exception occurs when the variable is null.
- ArgumentException: This exception occurs when the target is not valid EnvironmentVariableTarget value.
Example:
C#
// C# program to illustrate how to find the
// environment variables Using Environment Class
using System;
using System.Collections;
class GFG{
static public void Main()
{
// Create a IDictionary to get the environment variables
IDictionary data = Environment.GetEnvironmentVariables();
// Display the details with key and value
foreach (DictionaryEntry i in data)
{
Console.WriteLine("{0}:{1}", i.Key, i.Value);
}
}
}
Output:
USER:priya
GOPATH:/Users/priya/Documents/go
rvm_stored_umask:022
rvm_version:1.29.12 (latest)
HOME:/Users/priya
rvm_bin_path:/Users/priya/.rvm/bin
Press any key to continue...
Similar Reads
Non-linear Components In electrical circuits, Non-linear Components are electronic devices that need an external power source to operate actively. Non-Linear Components are those that are changed with respect to the voltage and current. Elements that do not follow ohm's law are called Non-linear Components. Non-linear Co
11 min read
Spring Boot Tutorial Spring Boot is a Java framework that makes it easier to create and run Java applications. It simplifies the configuration and setup process, allowing developers to focus more on writing code for their applications. This Spring Boot Tutorial is a comprehensive guide that covers both basic and advance
10 min read
Class Diagram | Unified Modeling Language (UML) A UML class diagram is a visual tool that represents the structure of a system by showing its classes, attributes, methods, and the relationships between them. It helps everyone involved in a projectâlike developers and designersâunderstand how the system is organized and how its components interact
12 min read
Steady State Response In this article, we are going to discuss the steady-state response. We will see what is steady state response in Time domain analysis. We will then discuss some of the standard test signals used in finding the response of a response. We also discuss the first-order response for different signals. We
9 min read
Backpropagation in Neural Network Back Propagation is also known as "Backward Propagation of Errors" is a method used to train neural network . Its goal is to reduce the difference between the modelâs predicted output and the actual output by adjusting the weights and biases in the network.It works iteratively to adjust weights and
9 min read
Polymorphism in Java Polymorphism in Java is one of the core concepts in object-oriented programming (OOP) that allows objects to behave differently based on their specific class type. The word polymorphism means having many forms, and it comes from the Greek words poly (many) and morph (forms), this means one entity ca
7 min read
3-Phase Inverter An inverter is a fundamental electrical device designed primarily for the conversion of direct current into alternating current . This versatile device , also known as a variable frequency drive , plays a vital role in a wide range of applications , including variable frequency drives and high power
13 min read
What is Vacuum Circuit Breaker? A vacuum circuit breaker is a type of breaker that utilizes a vacuum as the medium to extinguish electrical arcs. Within this circuit breaker, there is a vacuum interrupter that houses the stationary and mobile contacts in a permanently sealed enclosure. When the contacts are separated in a high vac
13 min read
AVL Tree Data Structure An AVL tree defined as a self-balancing Binary Search Tree (BST) where the difference between heights of left and right subtrees for any node cannot be more than one. Example of an AVL Tree:The balance factors for different nodes are : 12 :1, 8:1, 18:1, 5:1, 11:0, 17:0 and 4:0. Since all differences
4 min read
CTE in SQL In SQL, a Common Table Expression (CTE) is an essential tool for simplifying complex queries and making them more readable. By defining temporary result sets that can be referenced multiple times, a CTE in SQL allows developers to break down complicated logic into manageable parts. CTEs help with hi
6 min read