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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections;
using System.Diagnostics;
using System.Reflection;
using System.Threading;
namespace System
{
public static partial class Environment
{
public static string? GetEnvironmentVariable(string variable)
{
if (variable == null)
throw new ArgumentNullException(nameof(variable));
return GetEnvironmentVariableCore(variable);
}
public static string? GetEnvironmentVariable(string variable, EnvironmentVariableTarget target)
{
if (target == EnvironmentVariableTarget.Process)
return GetEnvironmentVariable(variable);
if (variable == null)
throw new ArgumentNullException(nameof(variable));
bool fromMachine = ValidateAndConvertRegistryTarget(target);
return GetEnvironmentVariableFromRegistry(variable, fromMachine);
}
public static IDictionary GetEnvironmentVariables(EnvironmentVariableTarget target)
{
if (target == EnvironmentVariableTarget.Process)
return GetEnvironmentVariables();
bool fromMachine = ValidateAndConvertRegistryTarget(target);
return GetEnvironmentVariablesFromRegistry(fromMachine);
}
public static void SetEnvironmentVariable(string variable, string? value)
{
ValidateVariableAndValue(variable, ref value);
SetEnvironmentVariableCore(variable, value);
}
public static void SetEnvironmentVariable(string variable, string? value, EnvironmentVariableTarget target)
{
if (target == EnvironmentVariableTarget.Process)
{
SetEnvironmentVariable(variable, value);
return;
}
ValidateVariableAndValue(variable, ref value);
bool fromMachine = ValidateAndConvertRegistryTarget(target);
SetEnvironmentVariableFromRegistry(variable, value, fromMachine: fromMachine);
}
public static string CommandLine => PasteArguments.Paste(GetCommandLineArgs(), pasteFirstArgumentUsingArgV0Rules: true);
public static string CurrentDirectory
{
get => CurrentDirectoryCore;
set
{
if (value == null)
throw new ArgumentNullException(nameof(value));
if (value.Length == 0)
throw new ArgumentException(SR.Argument_PathEmpty, nameof(value));
CurrentDirectoryCore = value;
}
}
public static string ExpandEnvironmentVariables(string name)
{
if (name == null)
throw new ArgumentNullException(nameof(name));
if (name.Length == 0)
return name;
return ExpandEnvironmentVariablesCore(name);
}
private static string[]? s_commandLineArgs;
internal static void SetCommandLineArgs(string[] cmdLineArgs) // invoked from VM
{
s_commandLineArgs = cmdLineArgs;
}
public static string GetFolderPath(SpecialFolder folder) => GetFolderPath(folder, SpecialFolderOption.None);
public static string GetFolderPath(SpecialFolder folder, SpecialFolderOption option)
{
if (!Enum.IsDefined(typeof(SpecialFolder), folder))
throw new ArgumentOutOfRangeException(nameof(folder), folder, SR.Format(SR.Arg_EnumIllegalVal, folder));
if (option != SpecialFolderOption.None && !Enum.IsDefined(typeof(SpecialFolderOption), option))
throw new ArgumentOutOfRangeException(nameof(option), option, SR.Format(SR.Arg_EnumIllegalVal, option));
return GetFolderPathCore(folder, option);
}
public static bool Is64BitProcess => IntPtr.Size == 8;
public static bool Is64BitOperatingSystem => Is64BitProcess || Is64BitOperatingSystemWhen32BitProcess;
private static OperatingSystem? s_osVersion;
public static OperatingSystem OSVersion
{
get
{
if (s_osVersion == null)
{
Interlocked.CompareExchange(ref s_osVersion, GetOSVersion(), null);
}
return s_osVersion!; // TODO-NULLABLE: Remove ! when compiler specially-recognizes CompareExchange for nullability
}
}
public static bool UserInteractive => true;
public static Version Version
{
get
{
// FX_PRODUCT_VERSION is expected to be set by the host
string? versionString = (string?)AppContext.GetData("FX_PRODUCT_VERSION");
if (versionString == null)
{
// Use AssemblyInformationalVersionAttribute as fallback if the exact product version is not specified by the host
versionString = typeof(object).Assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>()?.InformationalVersion;
}
ReadOnlySpan<char> versionSpan = versionString.AsSpan();
// Strip optional suffixes
int separatorIndex = versionSpan.IndexOfAny("-+ ");
if (separatorIndex != -1)
versionSpan = versionSpan.Slice(0, separatorIndex);
// Return zeros rather then failing if the version string fails to parse
return Version.TryParse(versionSpan, out Version? version) ? version! : new Version(); // TODO-NULLABLE: Remove ! when nullable attributes are respected
}
}
public static long WorkingSet
{
get
{
// Use reflection to access the implementation in System.Diagnostics.Process.dll. While far from ideal,
// we do this to avoid duplicating the Windows, Linux, macOS, and potentially other platform-specific implementations
// present in Process. If it proves important, we could look at separating that functionality out of Process into
// Common files which could also be included here.
Type? processType = Type.GetType("System.Diagnostics.Process, System.Diagnostics.Process, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", throwOnError: false);
IDisposable? currentProcess = processType?.GetMethod("GetCurrentProcess")?.Invoke(null, BindingFlags.DoNotWrapExceptions, null, null, null) as IDisposable;
if (currentProcess != null)
{
using (currentProcess)
{
object? result = processType!.GetMethod("get_WorkingSet64")?.Invoke(currentProcess, BindingFlags.DoNotWrapExceptions, null, null, null);
if (result is long) return (long)result;
}
}
// Could not get the current working set.
return 0;
}
}
private static bool ValidateAndConvertRegistryTarget(EnvironmentVariableTarget target)
{
Debug.Assert(target != EnvironmentVariableTarget.Process);
if (target == EnvironmentVariableTarget.Machine)
return true;
if (target == EnvironmentVariableTarget.User)
return false;
throw new ArgumentOutOfRangeException(nameof(target), target, SR.Format(SR.Arg_EnumIllegalVal, target));
}
private static void ValidateVariableAndValue(string variable, ref string? value)
{
if (variable == null)
throw new ArgumentNullException(nameof(variable));
if (variable.Length == 0)
throw new ArgumentException(SR.Argument_StringZeroLength, nameof(variable));
if (variable[0] == '\0')
throw new ArgumentException(SR.Argument_StringFirstCharIsZero, nameof(variable));
if (variable.Contains('='))
throw new ArgumentException(SR.Argument_IllegalEnvVarName, nameof(variable));
if (string.IsNullOrEmpty(value) || value[0] == '\0')
{
// Explicitly null out value if it's empty
value = null;
}
}
}
}
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