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Update feature switch doc to remove duplication of official docs (#104673)

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* Sort the current table by the build properties

* Document WinForms feature switches

* FB
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Lakshan Fernando 2024-07-22 07:40:18 -07:00 • committed by GitHub
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docs/workflow/trimming/feature-switches.md
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Starting with .NET 5 there are several [feature-switches](https://github.com/dotnet/designs/blob/master/accepted/2020/feature-switch.md) available which
can be used to control the size of the final binary. They are available in all
configurations but their defaults might vary as any SDK can set the defaults differently.
configurations but their defaults might vary as any SDK can set the defaults differently. Publicly documented feature switches can be found on the [official docs](https://learn.microsoft.com/en-us/dotnet/core/deploying/trimming/trimming-options#trimming-framework-library-features). Non-public feature switches that impact the runtime libraries can be found in the following table.
## Available Feature Switches
| MSBuild Property Name | AppContext Setting | Description |
|-|-|-|
| DebuggerSupport | System.Diagnostics.Debugger.IsSupported | Any dependency that enables better debugging experience to be trimmed when set to false |
| EnableUnsafeUTF7Encoding | System.Text.Encoding.EnableUnsafeUTF7Encoding | Insecure UTF-7 encoding is trimmed when set to false |
| EnableUnsafeBinaryFormatterSerialization | System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization | BinaryFormatter serialization support is trimmed when set to false |
| EventSourceSupport | System.Diagnostics.Tracing.EventSource.IsSupported | Any EventSource related code or logic is trimmed when set to false |
| InvariantGlobalization | System.Globalization.Invariant | All globalization specific code and data is trimmed when set to true |
| MetricsSupport | System.Diagnostics.Metrics.Meter.IsSupported | Any Metrics related code or logic is trimmed when set to false |
| PredefinedCulturesOnly | System.Globalization.PredefinedCulturesOnly | Don't allow creating a culture for which the platform does not have data |
| HybridGlobalization | System.Globalization.Hybrid | Properties connected with the mixed: platform-specific + icu-based globalization will be trimmed |
| UseSystemResourceKeys | System.Resources.UseSystemResourceKeys | Any localizable resources for system assemblies is trimmed when set to true |
| HttpActivityPropagationSupport | System.Net.Http.EnableActivityPropagation | Any dependency related to diagnostics support for System.Net.Http is trimmed when set to false |
| UseNativeHttpHandler | System.Net.Http.UseNativeHttpHandler | HttpClient uses by default platform native implementation of HttpMessageHandler if set to true. |
| StartupHookSupport | System.StartupHookProvider.IsSupported | Startup hooks are disabled when set to false. Startup hook related functionality can be trimmed. |
| AutoreleasePoolSupport | System.Threading.Thread.EnableAutoreleasePool | When set to true, creates an NSAutoreleasePool for each thread and thread pool work item on applicable platforms. |
| CustomResourceTypesSupport | System.Resources.ResourceManager.AllowCustomResourceTypes | Use of custom resource types is disabled when set to false. ResourceManager code paths that use reflection for custom types can be trimmed. |
| EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization | System.ComponentModel.TypeConverter.EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization | BinaryFormatter serialization support is trimmed when set to false. |
| BuiltInComInteropSupport | System.Runtime.InteropServices.BuiltInComInterop.IsSupported | Built-in COM support is trimmed when set to false. |
| EnableCppCLIHostActivation | System.Runtime.InteropServices.EnableCppCLIHostActivation | C++/CLI host activation code is disabled when set to false and related functionality can be trimmed. |
| MetadataUpdaterSupport | System.Reflection.Metadata.MetadataUpdater.IsSupported | Metadata update related code to be trimmed when set to false |
| _EnableConsumingManagedCodeFromNativeHosting | System.Runtime.InteropServices.EnableConsumingManagedCodeFromNativeHosting | Getting a managed function from native hosting is disabled when set to false and related functionality can be trimmed. |
| VerifyDependencyInjectionOpenGenericServiceTrimmability | Microsoft.Extensions.DependencyInjection.VerifyOpenGenericServiceTrimmability | When set to true, DependencyInjection will verify trimming annotations applied to open generic services are correct |
| DisableDependencyInjectionDynamicEngine | Microsoft.Extensions.DependencyInjection.DisableDynamicEngine | When set to true, DependencyInjection will avoid using System.Reflection.Emit when realizing services |
| DynamicCodeSupport | System.Runtime.CompilerServices.RuntimeFeature.IsDynamicCodeSupported | Changes RuntimeFeature.IsDynamicCodeSupported to false to allow testing AOT-safe fallback code without publishing for Native AOT. |
| _AggressiveAttributeTrimming | System.AggressiveAttributeTrimming | When set to true, aggressively trims attributes to allow for the most size savings possible, even if it could result in runtime behavior changes |
| JsonSerializerIsReflectionEnabledByDefault | System.Text.Json.JsonSerializer.IsReflectionEnabledByDefault | When set to false, disables using reflection as the default contract resolver in System.Text.Json |
| EnableGeneratedComInterfaceComImportInterop | System.Runtime.InteropServices.Marshalling.EnableGeneratedComInterfaceComImportInterop | When set to true, enables casting source-generated COM object wrappers to built-in COM-based COM interfaces. |
| _UseManagedNtlm | System.Net.Security.UseManagedNtlm | When set to true, uses built-in managed implementation of NTLM and SPNEGO algorithm for HTTP, SMTP authentication, and NegotiateAuthentication API instead of system provided GSSAPI implementation. |
| _ComObjectDescriptorSupport | System.ComponentModel.TypeDescriptor.IsComObjectDescriptorSupported | When set to true, supports creating a TypeDescriptor based view of COM objects. |
| _DesignerHostSupport | System.ComponentModel.Design.IDesignerHost.IsSupported | When set to true, supports creating design components at runtime. |
| _DefaultValueAttributeSupport | System.ComponentModel.DefaultValueAttribute.IsSupported | When set to true, supports creating a DefaultValueAttribute at runtime. |
| _DesignerHostSupport | System.ComponentModel.Design.IDesignerHost.IsSupported | When set to true, supports creating design components at runtime. |
| _EnableConsumingManagedCodeFromNativeHosting | System.Runtime.InteropServices.EnableConsumingManagedCodeFromNativeHosting | Getting a managed function from native hosting is disabled when set to false and related functionality can be trimmed. |
| _UseManagedNtlm | System.Net.Security.UseManagedNtlm | When set to true, uses built-in managed implementation of NTLM and SPNEGO algorithm for HTTP, SMTP authentication, and NegotiateAuthentication API instead of system provided GSSAPI implementation. |
Any feature-switch which defines property can be set in csproj file or
on the command line as any other MSBuild property. Those without predefined property name