Environment.xml

<TypeName="Environment"FullName="System.Environment">
 <TypeSignatureLanguage="C#"Value="public static class Environment"FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.6.2-pp;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
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 <TypeSignatureLanguage="DocId"Value="T:System.Environment" />
 <TypeSignatureLanguage="VB.NET"Value="Public Class Environment"FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.6.2-pp;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
 <TypeSignatureLanguage="F#"Value="type Environment = class" />
 <TypeSignatureLanguage="C++ CLI"Value="public ref class Environment abstract sealed"FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.6.2-pp;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
 <TypeSignatureLanguage="C#"Value="public sealed class Environment"FrameworkAlternate="netframework-1.1" />
 <TypeSignatureLanguage="ILAsm"Value=".class public auto ansi sealed beforefieldinit Environment extends System.Object"FrameworkAlternate="netframework-1.1" />
 <TypeSignatureLanguage="VB.NET"Value="Public NotInheritable Class Environment"FrameworkAlternate="netframework-1.1" />
 <TypeSignatureLanguage="C++ CLI"Value="public ref class Environment sealed"FrameworkAlternate="netframework-1.1" />
 <AssemblyInfo>
 <AssemblyName>System.Runtime.Extensions</AssemblyName>
 <AssemblyVersion>4.0.0.0</AssemblyVersion>
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 <Base>
 <BaseTypeName>System.Object</BaseTypeName>
 </Base>
 <Interfaces />
 <Attributes>
 <AttributeFrameworkAlternate="net-10.0;net-8.0;net-9.0">
 <AttributeNameLanguage="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
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 <AttributeNameLanguage="C#">[System.Runtime.InteropServices.ComVisible(true)]</AttributeName>
 <AttributeNameLanguage="F#">[&lt;System.Runtime.InteropServices.ComVisible(true)&gt;]</AttributeName>
 </Attribute>
 </Attributes>
 <Docs>
 <summary>Provides information about, and means to manipulate, the current environment and platform. This class cannot be inherited.</summary>
 <remarks>
 <formattype="text/markdown"><![CDATA[

## Remarks
 Use the <xref:System.Environment> class to retrieve information such as command-line arguments, the exit code, environment variable settings, contents of the call stack, time since last system boot, and the version of the common language runtime.

## Examples
 The following example displays a list of information about the current environment.

 :::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/environment.class/CPP/env0.cpp" id="Snippet1":::
 :::code language="csharp" source="~/snippets/csharp/System/Environment/Overview/env0.cs" id="Snippet1":::
 :::code language="fsharp" source="~/snippets/fsharp/System/Environment/Overview/env0.fs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/environment.class/VB/env0.vb" id="Snippet1":::

]]></format>
 </remarks>
 </Docs>
 <Members>
 <MemberMemberName="CommandLine">
 <MemberSignatureLanguage="C#"Value="public static string CommandLine { get; }" />
 <MemberSignatureLanguage="ILAsm"Value=".property string CommandLine" />
 <MemberSignatureLanguage="DocId"Value="P:System.Environment.CommandLine" />
 <MemberSignatureLanguage="VB.NET"Value="Public Shared ReadOnly Property CommandLine As String" />
 <MemberSignatureLanguage="F#"Value="static member CommandLine : string"Usage="System.Environment.CommandLine" />
 <MemberSignatureLanguage="C++ CLI"Value="public:&#xA; static property System::String ^ CommandLine { System::String ^ get(); };" />
 <MemberType>Property</MemberType>
 <AssemblyInfo>
 <AssemblyName>mscorlib</AssemblyName>
 <AssemblyVersion>1.0.5000.0</AssemblyVersion>
 <AssemblyVersion>2.0.0.0</AssemblyVersion>
 <AssemblyVersion>2.0.5.0</AssemblyVersion>
 <AssemblyVersion>4.0.0.0</AssemblyVersion>
 </AssemblyInfo>
 <AssemblyInfo>
 <AssemblyName>netstandard</AssemblyName>
 <AssemblyVersion>2.0.0.0</AssemblyVersion>
 <AssemblyVersion>2.1.0.0</AssemblyVersion>
 </AssemblyInfo>
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 <AssemblyName>System.Runtime.Extensions</AssemblyName>
 <AssemblyVersion>4.2.0.0</AssemblyVersion>
 <AssemblyVersion>4.2.1.0</AssemblyVersion>
 <AssemblyVersion>4.2.2.0</AssemblyVersion>
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 <AssemblyName>System.Runtime</AssemblyName>
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 <AssemblyVersion>8.0.0.0</AssemblyVersion>
 <AssemblyVersion>9.0.0.0</AssemblyVersion>
 <AssemblyVersion>10.0.0.0</AssemblyVersion>
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 <AttributeNameLanguage="C#">[get: System.Security.SecuritySafeCritical]</AttributeName>
 <AttributeNameLanguage="F#">[&lt;get: System.Security.SecuritySafeCritical&gt;]</AttributeName>
 </Attribute>
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 <ReturnValue>
 <ReturnType>System.String</ReturnType>
 </ReturnValue>
 <Docs>
 <summary>Gets the command line for this process.</summary>
 <value>A string containing command-line arguments.</value>
 <remarks>
 <formattype="text/markdown"><![CDATA[

## Remarks
 This property provides access to the program name and any arguments specified on the command line when the current process was started.

 The program name can include path information, but is not required to do so. Use the <xref:System.Environment.GetCommandLineArgs%2A> method to retrieve the command-line information parsed and stored in an array of strings.

 The maximum size of the command-line buffer is not set to a specific number of characters; it varies depending on the Windows operating system that is running on the computer.

## Examples
 The following example displays its own command line.

 :::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/environment.CommandLine/CPP/commandline.cpp" id="Snippet1":::
 :::code language="csharp" source="~/snippets/csharp/System/Environment/CommandLine/commandline.cs" id="Snippet1":::
 :::code language="fsharp" source="~/snippets/fsharp/System/Environment/CommandLine/commandline.fs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/environment.CommandLine/VB/commandline.vb" id="Snippet1":::

]]></format>
 </remarks>
 <altmembercref="M:System.Environment.GetCommandLineArgs" />
 </Docs>
 </Member>
 <MemberMemberName="CpuUsage">
 <MemberSignatureLanguage="C#"Value="public static Environment.ProcessCpuUsage CpuUsage { get; }" />
 <MemberSignatureLanguage="ILAsm"Value=".property valuetype System.Environment/ProcessCpuUsage CpuUsage" />
 <MemberSignatureLanguage="DocId"Value="P:System.Environment.CpuUsage" />
 <MemberSignatureLanguage="VB.NET"Value="Public Shared ReadOnly Property CpuUsage As Environment.ProcessCpuUsage" />
 <MemberSignatureLanguage="F#"Value="static member CpuUsage : Environment.ProcessCpuUsage"Usage="System.Environment.CpuUsage" />
 <MemberSignatureLanguage="C++ CLI"Value="public:&#xA; static property Environment::ProcessCpuUsage CpuUsage { Environment::ProcessCpuUsage get(); };" />
 <MemberType>Property</MemberType>
 <AssemblyInfo>
 <AssemblyName>System.Runtime</AssemblyName>
 <AssemblyVersion>9.0.0.0</AssemblyVersion>
 <AssemblyVersion>10.0.0.0</AssemblyVersion>
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 <AssemblyName>System.Runtime.Extensions</AssemblyName>
 </AssemblyInfo>
 <AssemblyInfo>
 <AssemblyName>mscorlib</AssemblyName>
 </AssemblyInfo>
 <AssemblyInfo>
 <AssemblyName>netstandard</AssemblyName>
 </AssemblyInfo>
 <Attributes>
 <AttributeFrameworkAlternate="net-10.0;net-9.0">
 <AttributeNameLanguage="C#">[System.Runtime.Versioning.SupportedOSPlatform("maccatalyst")]</AttributeName>
 <AttributeNameLanguage="F#">[&lt;System.Runtime.Versioning.SupportedOSPlatform("maccatalyst")&gt;]</AttributeName>
 </Attribute>
 <AttributeFrameworkAlternate="net-10.0;net-9.0">
 <AttributeNameLanguage="C#">[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]</AttributeName>
 <AttributeNameLanguage="F#">[&lt;System.Runtime.Versioning.UnsupportedOSPlatform("browser")&gt;]</AttributeName>
 </Attribute>
 <AttributeFrameworkAlternate="net-10.0;net-9.0">
 <AttributeNameLanguage="C#">[System.Runtime.Versioning.UnsupportedOSPlatform("ios")]</AttributeName>
 <AttributeNameLanguage="F#">[&lt;System.Runtime.Versioning.UnsupportedOSPlatform("ios")&gt;]</AttributeName>
 </Attribute>
 <AttributeFrameworkAlternate="net-10.0;net-9.0">
 <AttributeNameLanguage="C#">[System.Runtime.Versioning.UnsupportedOSPlatform("tvos")]</AttributeName>
 <AttributeNameLanguage="F#">[&lt;System.Runtime.Versioning.UnsupportedOSPlatform("tvos")&gt;]</AttributeName>
 </Attribute>
 </Attributes>
 <ReturnValue>
 <ReturnType>System.Environment+ProcessCpuUsage</ReturnType>
 </ReturnValue>
 <Docs>
 <summary>
 <para>Get the CPU usage, including the process time spent running the application code, the process time spent running the operating system code, and the total time spent running both the application and operating system code.</para>
 </summary>
 <value>To be added.</value>
 <remarks>To be added.</remarks>
 </Docs>
 </Member>
 <MemberMemberName="CurrentDirectory">
 <MemberSignatureLanguage="C#"Value="public static string CurrentDirectory { get; set; }" />
 <MemberSignatureLanguage="ILAsm"Value=".property string CurrentDirectory" />
 <MemberSignatureLanguage="DocId"Value="P:System.Environment.CurrentDirectory" />
 <MemberSignatureLanguage="VB.NET"Value="Public Shared Property CurrentDirectory As String" />
 <MemberSignatureLanguage="F#"Value="static member CurrentDirectory : string with get, set"Usage="System.Environment.CurrentDirectory" />
 <MemberSignatureLanguage="C++ CLI"Value="public:&#xA; static property System::String ^ CurrentDirectory { System::String ^ get(); void set(System::String ^ value); };" />
 <MemberType>Property</MemberType>
 <AssemblyInfo>
 <AssemblyName>mscorlib</AssemblyName>
 <AssemblyVersion>1.0.5000.0</AssemblyVersion>
 <AssemblyVersion>2.0.0.0</AssemblyVersion>
 <AssemblyVersion>2.0.5.0</AssemblyVersion>
 <AssemblyVersion>4.0.0.0</AssemblyVersion>
 </AssemblyInfo>
 <AssemblyInfo>
 <AssemblyName>netstandard</AssemblyName>
 <AssemblyVersion>2.0.0.0</AssemblyVersion>
 <AssemblyVersion>2.1.0.0</AssemblyVersion>
 </AssemblyInfo>
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 <AssemblyName>System.Runtime.Extensions</AssemblyName>
 <AssemblyVersion>4.2.0.0</AssemblyVersion>
 <AssemblyVersion>4.2.1.0</AssemblyVersion>
 <AssemblyVersion>4.2.2.0</AssemblyVersion>
 </AssemblyInfo>
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 <AssemblyName>System.Runtime</AssemblyName>
 <AssemblyVersion>5.0.0.0</AssemblyVersion>
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 <AssemblyVersion>7.0.0.0</AssemblyVersion>
 <AssemblyVersion>8.0.0.0</AssemblyVersion>
 <AssemblyVersion>9.0.0.0</AssemblyVersion>
 <AssemblyVersion>10.0.0.0</AssemblyVersion>
 </AssemblyInfo>
 <ReturnValue>
 <ReturnType>System.String</ReturnType>
 </ReturnValue>
 <Docs>
 <summary>Gets or sets the fully qualified path of the current working directory.</summary>
 <value>The directory path.</value>
 <remarks>
 <formattype="text/markdown"><![CDATA[

## Remarks
 By definition, if this process starts in the root directory of a local or network drive, the value of this property is the drive name followed by a trailing slash (for example, "C:\\"). If this process starts in a subdirectory, the value of this property is the drive and subdirectory path, without a trailing slash (for example, "C:\mySubDirectory").

## Examples
 The following example demonstrates setting the <xref:System.Environment.CurrentDirectory%2A> property.

 :::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.Environment/CPP/Vars1.cpp" id="Snippet4":::
 :::code language="csharp" source="~/snippets/csharp/System/Environment/CurrentDirectory/Vars1.cs" id="Snippet4":::
 :::code language="fsharp" source="~/snippets/fsharp/System/Environment/CurrentDirectory/Vars1.fs" id="Snippet4":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Environment/VB/Vars1.vb" id="Snippet4":::

]]></format>
 </remarks>
 <exceptioncref="T:System.ArgumentException">Attempted to set to an empty string ("").</exception>
 <exceptioncref="T:System.ArgumentNullException">Attempted to set to <seelangword="null" />.</exception>
 <exceptioncref="T:System.IO.IOException">An I/O error occurred.</exception>
 <exceptioncref="T:System.IO.DirectoryNotFoundException">Attempted to set a local path that cannot be found.</exception>
 <exceptioncref="T:System.Security.SecurityException">The caller does not have the appropriate permission.</exception>
 </Docs>
 </Member>
 <MemberMemberName="CurrentManagedThreadId">
 <MemberSignatureLanguage="C#"Value="public static int CurrentManagedThreadId { get; }" />
 <MemberSignatureLanguage="ILAsm"Value=".property int32 CurrentManagedThreadId" />
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 <MemberSignatureLanguage="VB.NET"Value="Public Shared ReadOnly Property CurrentManagedThreadId As Integer" />
 <MemberSignatureLanguage="F#"Value="static member CurrentManagedThreadId : int"Usage="System.Environment.CurrentManagedThreadId" />
 <MemberSignatureLanguage="C++ CLI"Value="public:&#xA; static property int CurrentManagedThreadId { int get(); };" />
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 <AssemblyName>System.Runtime.Extensions</AssemblyName>
 <AssemblyVersion>4.0.0.0</AssemblyVersion>
 <AssemblyVersion>4.0.10.0</AssemblyVersion>
 <AssemblyVersion>4.1.0.0</AssemblyVersion>
 <AssemblyVersion>4.2.0.0</AssemblyVersion>
 <AssemblyVersion>4.2.1.0</AssemblyVersion>
 <AssemblyVersion>4.2.2.0</AssemblyVersion>
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 <AssemblyVersion>2.0.5.0</AssemblyVersion>
 <AssemblyVersion>4.0.0.0</AssemblyVersion>
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 <ReturnType>System.Int32</ReturnType>
 </ReturnValue>
 <Docs>
 <summary>Gets a unique identifier for the current managed thread.</summary>
 <value>A unique identifier for this managed thread.</value>
 <remarks>To be added.</remarks>
 </Docs>
 </Member>
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 <MemberSignatureLanguage="ILAsm"Value=".method public static hidebysig void Exit(int32 exitCode) cil managed" />
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 <AttributeNameLanguage="C#">[System.Diagnostics.CodeAnalysis.DoesNotReturn]</AttributeName>
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 <AttributeNameLanguage="C#">[System.Security.SecuritySafeCritical]</AttributeName>
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 <formattype="text/markdown"><![CDATA[

## Remarks
 For the `exitCode` parameter, use a non-zero number to indicate an error. In your application, you can define your own error codes in an enumeration, and return the appropriate error code based on the scenario. For example, return a value of 1 to indicate that the required file is not present, and a value of 2 to indicate that the file is in the wrong format. For a list of exit codes used by the Windows operating system, see [System Error Codes](/windows/win32/debug/system-error-codes) in the Windows documentation.

 Calling the <xref:System.Environment.Exit%2A> method differs from using your programming language's `return` statement in the following ways:

- <xref:System.Environment.Exit%2A> always terminates an application. Using the `return` statement may terminate an application only if it is used in the application entry point, such as in the `Main` method.

- <xref:System.Environment.Exit%2A> terminates an application immediately, even if other threads are running. If the `return` statement is called in the application entry point, it causes an application to terminate only after all foreground threads have terminated.

- <xref:System.Environment.Exit%2A> requires the caller to have permission to call unmanaged code. The `return` statement does not.

- If <xref:System.Environment.Exit%2A> is called from a `try` or `catch` block, the code in any `finally` block does not execute. If the `return` statement is used, the code in the `finally` block does execute.

- If <xref:System.Environment.Exit%2A> is called when code in a [constrained execution region](/dotnet/framework/performance/constrained-execution-regions) (CER) is running, the CER will not complete execution. If the `return` statement is used, the CER completes execution.

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 <formattype="text/markdown"><![CDATA[

## Remarks
 If the `Main` method returns `void`, you can use this property to set the exit code that will be returned to the calling environment. If `Main` does not return `void`, this property is ignored. The initial value of this property is zero.

> [!WARNING]
> The <xref:System.Environment.ExitCode%2A> property is a signed 32-bit integer. To prevent the property from returning a negative exit code, you should not use values greater than or equal to 0x80000000.

 Use a non-zero number to indicate an error. In your application, you can define your own error codes in an enumeration, and return the appropriate error code based on the scenario. For example, return a value of 1 to indicate that the required file is not present and a value of 2 to indicate that the file is in the wrong format. For a list of exit codes used by the Windows operating system, see [System Error Codes](/windows/win32/debug/system-error-codes) in the Windows documentation.

## Examples
 The following is a simple app named Double.exe that doubles an integer value passed to it as a command-line argument. The value assigns error codes to the <xref:System.Environment.ExitCode%2A> property to indicate error conditions. Note that you must add a reference to the System.Numerics.dll assembly to successfully compile the example.

 :::code language="csharp" source="~/snippets/csharp/System/Environment/ExitCode/double.cs" id="Snippet1":::
 :::code language="fsharp" source="~/snippets/fsharp/System/Environment/ExitCode/double.fs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.environment.exitcode/vb/double.vb" id="Snippet1":::

 The example can then be invoked from a batch file such as the following, which makes its error codes accessible by using the `ERRORLEVEL` command.

```bat
@echo off
Double.exe %1
if errorlevel 1639 goto NoArg
if errorlevel 534 goto Overflow
if errorlevel 160 goto BadArg
if errorlevel 0 echo Completed Successfully
goto :EOF

:NoArg
echo Missing argument
goto :EOF

:Overflow
echo Arithmetic overflow
goto :EOF

:BadArg
echo Invalid argument
goto :EOF
```

 The following shows some sample output produced by invoking the batch file.

```txt
>getdouble 123
Result: 246
Completed Successfully

>getdouble 5912323109093
Arithmetic overflow

>getdouble
Missing argument

>getdouble "a string"
Invalid argument
```

 Note that code for Double.exe is identical in function to the following example, except that the former defines an entry point named `Main` that has no return value, whereas this example defines an entry point named `Main` that returns an integer.

 :::code language="csharp" source="~/snippets/csharp/System/Environment/ExitCode/double1.cs" id="Snippet2":::
 :::code language="fsharp" source="~/snippets/fsharp/System/Environment/ExitCode/double1.fs" id="Snippet2":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.environment.exitcode/vb/double1.vb" id="Snippet2":::

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## Remarks
 COM interop is used to retrieve the environment variables from the operating system. If the environment variables cannot be retrieved due to a COM error, the HRESULT that explains the cause of the failure is used to generate one of several possible exceptions; that is, the exception depends on the HRESULT. For more information about how the HRESULT is processed, see the Remarks section of the <xref:System.Runtime.InteropServices.Marshal.ThrowExceptionForHR%2A?displayProperty=nameWithType> method.

 Replacement only occurs for environment variables that are set. For example, suppose `name` is "MyENV = %MyENV%". If the environment variable, MyENV, is set to 42, this method returns "MyENV = 42". If MyENV is not set, no change occurs; this method returns "MyENV = %MyENV%".

 The size of the return value is limited to 32K.

## Examples
 The following example shows how to obtain the system drive and system root variables.

 :::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/environment.ExpandEnvironmentVariables/CPP/expandenvironmentvariables.cpp" id="Snippet1":::
 :::code language="csharp" source="~/snippets/csharp/System/Environment/ExpandEnvironmentVariables/expandenvironmentvariables.cs" id="Snippet1":::
 :::code language="fsharp" source="~/snippets/fsharp/System/Environment/ExpandEnvironmentVariables/expandenvironmentvariables.fs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/environment.ExpandEnvironmentVariables/VB/expandenvironmentvariables.vb" id="Snippet1":::

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## Remarks
 This method terminates a process without running any active `try`/`finally` blocks or finalizers.

 On Windows, the `Environment.FailFast` method writes the `message` string to the Windows Application event log, creates a dump of your application, and then terminates the current process. The `message` string is also included in error reporting to Microsoft via Windows Error Reporting. For more information, see [Windows Error Reporting: Getting Started](/windows-hardware/drivers/dashboard/).

 On Unix-like systems, the message is written to the standard error stream, alongside the stack trace information.

 Use the `Environment.FailFast` method instead of the <xref:System.Environment.Exit%2A> method to terminate your application if the state of your application is damaged beyond repair, and executing your application's `try`/`finally` blocks and finalizers will corrupt program resources.

Calling the `Environment.FailFast` method to terminate execution of an application running in the Visual Studio debugger throws an <xref:System.ExecutionEngineException> and automatically triggers the [fatalExecutionEngineError managed debugging assistant (MDA)](/dotnet/framework/debug-trace-profile/fatalexecutionengineerror-mda).

## Examples
 The following example writes a log entry to the Windows Application event log when running under Windows, or writes the error message to the standard error stream when running under a Unix-like system, and terminates the current process.

 :::code language="csharp" source="~/snippets/csharp/System/Environment/FailFast/ff.cs" id="Snippet1":::
 :::code language="fsharp" source="~/snippets/fsharp/System/Environment/FailFast/ff.fs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/environment.FailFast/vb/ff.vb" id="Snippet1":::

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## Remarks
 This method terminates the process without running any active `try`/`finally` blocks or finalizers.

 On Windows, the `Environment.FailFast` method writes the `message` string to the Windows Application event log, creates a dump of your application, and then terminates the current process.

 Information is reported to Microsoft by using Windows Error Reporting. For more information, see [Windows Error Reporting: Getting Started](/windows-hardware/drivers/dashboard/). Error reporting to Microsoft includes `message` and `exception` information, which provides details used to classify the error. Although `exception` is not handled because the process is terminated, the contextual information that raised the exception is still obtained.

 On Unix-like systems, the message is written to the standard error stream, alongside the stack trace information.

 If `exception` is `null`, or if `exception` is not thrown, this method operates the same as the <xref:System.Environment.FailFast%28System.String%29> method overload.

 Use the `Environment.FailFast` method instead of the <xref:System.Environment.Exit%2A> method to terminate your application if the state of your application is damaged beyond repair, and executing your application's `try`/`finally` blocks and finalizers will corrupt program resources.

Calling the `Environment.FailFast` method to terminate execution of an application running in the Visual Studio debugger throws an <xref:System.ExecutionEngineException> and automatically triggers the [fatalExecutionEngineError managed debugging assistant (MDA)](/dotnet/framework/debug-trace-profile/fatalexecutionengineerror-mda).

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## Remarks
 The first element in the array contains the file name of the executing program. If the file name is not available, the first element is equal to <xref:System.String.Empty?displayProperty=nameWithType>. The remaining elements contain any additional tokens entered on the command line.

In .NET 5 and later versions, for single-file publishing, the first element is the name of the host executable.

 The program file name can, but is not required to, include path information.

 Command line arguments are delimited by spaces. You can use double quotation marks (") to include spaces within an argument. The single quotation mark ('), however, does not provide this functionality.

 If a double quotation mark follows two or an even number of backslashes, each proceeding backslash pair is replaced with one backslash and the double quotation mark is removed. If a double quotation mark follows an odd number of backslashes, including just one, each preceding pair is replaced with one backslash and the remaining backslash is removed; however, in this case the double quotation mark is not removed.

 The following table shows how command line arguments can be delimited, and assumes `MyApp` as the current executing application.

|Input at the command line|Resulting command line arguments|
|-------------------------------|--------------------------------------|
|`MyApp alpha beta`|`MyApp, alpha, beta`|
|`MyApp "alpha with spaces" "beta with spaces"`|`MyApp, alpha with spaces, beta with spaces`|
|`MyApp 'alpha with spaces' beta`|`MyApp, 'alpha, with, spaces', beta`|
|`MyApp \\\alpha \\\\"beta`|`MyApp, \\\alpha, \\beta`|
|`MyApp \\\\\"alpha \"beta`|`MyApp, \\"alpha, "beta`|

 To obtain the command line as a single string, use the <xref:System.Environment.CommandLine%2A> property.

## Examples
 The following example displays the application's command line arguments.

 :::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/Environment.GetCommandLineArgs/CPP/getcommandlineargs.cpp" id="Snippet1":::
 :::code language="csharp" source="~/snippets/csharp/System/Environment/GetCommandLineArgs/getcommandlineargs.cs" id="Snippet1":::
 :::code language="fsharp" source="~/snippets/fsharp/System/Environment/GetCommandLineArgs/getcommandlineargs.fs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/Environment.GetCommandLineArgs/VB/getcommandlineargs.vb" id="Snippet1":::

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The following example uses the <xref:System.Environment.GetEnvironmentVariable%2A> method to retrieve the `windir` environment variable, which contains the path of the Windows directory.

:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_System/system.Environment/CPP/Vars1.cpp" id="Snippet4":::
:::code language="csharp" source="~/snippets/csharp/System/Environment/CurrentDirectory/Vars1.cs" id="Snippet4":::
:::code language="fsharp" source="~/snippets/fsharp/System/Environment/CurrentDirectory/Vars1.fs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Environment/VB/Vars1.vb" id="Snippet4":::

The following example attempts to retrieve the value of an environment variable named `Test1` from the process environment block. If the variable doesn't exist, the example creates it and retrieves its value. The example displays the value of the variable. If the example created the variable, it also calls the <xref:System.Environment.GetEnvironmentVariables%28System.EnvironmentVariableTarget%29> method with each member of the <xref:System.EnvironmentVariableTarget> enumeration to establish that the variable can be retrieved only from the current process environment block. Finally, if the example created the variable, it deletes it.

:::code language="csharp" source="~/snippets/csharp/System/Environment/GetEnvironmentVariable/getenvironmentvariableex1.cs":::
:::code language="fsharp" source="~/snippets/fsharp/System/Environment/GetEnvironmentVariable/getenvironmentvariableex1.fs":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.environment.getenvironmentvariable/vb/getenvironmentvariableex1.vb":::
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