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Environment.GetEnvironmentVariables Method

Retrieves all environment variable names and their values from the current process.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static IDictionary GetEnvironmentVariables()

Return Value

Type: System.Collections.IDictionary
A dictionary that contains all environment variable names and their values; otherwise, an empty dictionary if no environment variables are found.


The caller does not have the required permission to perform this operation.


The buffer is out of memory.

The names and values for the environment variables are stored as key-value pairs in the returned IDictionary.

The following example demonstrates the GetEnvironmentVariables method.

// Sample for the Environment.GetEnvironmentVariables method 
using System;
using System.Collections;

class Sample 
    public static void Main() 
       Console.WriteLine("GetEnvironmentVariables: ");
       foreach (DictionaryEntry de in Environment.GetEnvironmentVariables()) 
           Console.WriteLine("  {0} = {1}", de.Key, de.Value);
// Output from the example is not shown, since it is: 
//    Lengthy. 
//    Specific to the machine on which the example is run. 
//    May reveal information that should remain secure.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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