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Conditional compilation symbols
Gert Driesen edited this page May 3, 2020
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In our codebase, we use the following conditional compilation symbols to identity features supported by a given target framework:
| Symbol | Description |
|---|---|
| FEATURE_ENCODING_ASCII | Encoding.ASCII is available |
| FEATURE_BINARY_SERIALIZATION | Binary serialization is supported. |
| FEATURE_DIAGNOSTICS_TRACESOURCE | TraceSource is available |
| FEATURE_DIRECTORYINFO_ENUMERATEFILES | DirectoryInfo.EnumerationFiles(string) is available |
| FEATURE_DYNAMIC_TYPE | Dynamic type is supported |
| FEATURE_RNG_CSP | RandomNumberGenerator can be created using default ctor of RNGCryptoServiceProvider |
| FEATURE_RNG_CREATE | RandomNumberGenerator can be created using static Create method on RandomNumberGenerator |
| FEATURE_HASHALGORITHM_DISPOSE | HashAlgortihm.Dispose() is available |
| FEATURE_HASH_MD5 | |
| FEATURE_HASH_SHA1_CREATE | |
| FEATURE_HASH_SHA1_MANAGED | |
| FEATURE_HASH_SHA256_CREATE | |
| FEATURE_HASH_SHA256_MANAGED | |
| FEATURE_HASH_SHA384_CREATE | |
| FEATURE_HASH_SHA384_MANAGED | |
| FEATURE_HASH_SHA512_CREATE | |
| FEATURE_HASH_SHA512_MANAGED | |
| FEATURE_HASH_RIPEMD160_CREATE | |
| FEATURE_HASH_RIPEMD160_MANAGED | |
| FEATURE_HMAC_MD5 | |
| FEATURE_HMAC_SHA1 | |
| FEATURE_HMAC_SHA256 | |
| FEATURE_HMAC_SHA384 | |
| FEATURE_HMAC_SHA512 | |
| FEATURE_HMAC_RIPEMD160 | |
| FEATURE_THREAD_COUNTDOWNEVENT | |
| FEATURE_THREAD_SLEEP | Current thread can be suspended using static Sleep method on Thread class |
| FEATURE_THREAD_TAP | Task-based Asynchronous Pattern is supported |
| FEATURE_THREAD_THREADPOOL | ThreadPool is supported |
| FEATURE_WAITHANDLE_DISPOSE | WaitHandle.Dispose() is available |
| FEATURE_MEMORYSTREAM_GETBUFFER | MemoryStream features a GetBuffer() method which allows access to the byte array from which this stream was created, or the underlying array |
| FEATURE_MEMORYSTREAM_TRYGETBUFFER | MemoryStream features a TryGetBuffer(out ArraySegment) method which allows access to the byte array from which this stream was created, or the underlying array |
| FEATURE_STREAM_TAP | Stream supports Task-based Asynchronous Pattern (TAP) |
| FEATURE_STREAM_APM | Stream supports Asynchronous Programming Model (APM) |
| FEATURE_SOCKET_TAP | Socket supports Task-based Asynchronous Pattern (TAP) |
| FEATURE_SOCKET_EAP | Socket supports Event-based Asynchronous Pattern (EAP) |
| FEATURE_SOCKET_APM | Socket supports Asynchronous Programming Model (APM) |
| FEATURE_SOCKET_SYNC | Socket supports synchronous execution |
| FEATURE_SOCKET_POLL | Socket features a Poll(Int32,SelectMode) method |
| FEATURE_SOCKET_SELECT | Socket features a Select(IList,IList,IList,Int32) method that is reliable |
| FEATURE_SOCKET_DISPOSE | Socket.Dispose() is available |
| FEATURE_DNS_TAP | Dns supports Task-based Asynchronous Pattern (TAP) |
| FEATURE_DNS_APM | Dns supports Asynchronous Programming Model (APM) |
| FEATURE_DNS_SYNC | Dns supports synchronous execution |
| FEATURE_REFLECTION_TYPEINFO | Type.GetTypeInfo() extension method is required to get a full reflection object from a given 'Type' |
| FEATURE_STRINGBUILDER_CLEAR | StringBuilder.Clear() is available |
Below you find a detailed overview on the target frameworks for which these conditional compilation symbols are defined.
| Symbol | net35 | net40 | netstandard1.3 | netstandard2.0 | sl4 | sl5 | uap10 | wp8 | wp71 |
|---|---|---|---|---|---|---|---|---|---|
| FEATURE_RNG_CSP | o | o | o | o | x | x | o | x | x |
| FEATURE_RNG_CREATE | x | x | x | x | o | o | o | o | o |
| FEATURE_HASHALGORITHM_DISPOSE | o | x | x | x | o | o | x | o | o |
| FEATURE_HASH_MD5 | x | x | x | x | o | o | o | o | o |
| FEATURE_HASH_SHA1_CREATE | x | x | x | x | o | o | o | o | o |
| FEATURE_HASH_SHA1_MANAGED | o | o | o | o | x | x | o | x | x |
| FEATURE_HASH_SHA256_CREATE | x | x | x | x | o | o | o | o | o |
| FEATURE_HASH_SHA256_MANAGED | o | o | o | o | x | x | o | x | x |
| FEATURE_HASH_SHA384_CREATE | x | x | x | x | o | o | o | o | o |
| FEATURE_HASH_SHA384_MANAGED | o | o | o | o | o | o | o | o | o |
| FEATURE_HASH_SHA512_CREATE | x | x | x | x | o | o | o | o | o |
| FEATURE_HASH_SHA512_MANAGED | o | o | o | o | o | o | o | o | o |
| FEATURE_HASH_RIPEMD160_CREATE | x | x | o | o | o | o | o | o | o |
| FEATURE_HASH_RIPEMD160_MANAGED | o | o | o | o | o | o | o | o | o |
| FEATURE_HMAC_MD5 | x | x | x | x | o | o | o | o | o |
| FEATURE_HMAC_SHA1 | x | x | x | x | x | x | o | x | x |
| FEATURE_HMAC_SHA256 | x | x | x | x | x | x | o | x | x |
| FEATURE_HMAC_SHA384 | x | x | x | x | o | o | o | o | o |
| FEATURE_HMAC_SHA512 | x | x | x | x | o | o | o | o | o |
| FEATURE_HMAC_RIPEMD160 | x | x | o | o | o | o | o | o | o |
| Symbol | net35 | net40 | netstandard1.3 | netstandard2.0 | sl4 | sl5 | uap10 | wp8 | wp71 |
|---|---|---|---|---|---|---|---|---|---|
| FEATURE_THREAD_COUNTDOWNEVENT | o | x | x | x | o | o | x | x | o |
| FEATURE_THREAD_SLEEP | x | x | x | x | x | x | o | x | x |
| FEATURE_THREAD_TAP | o | o | o | x | o | o | x | o | o |
| FEATURE_THREAD_THREADPOOL | x | x | x | x | x | x | o | x | x |
| FEATURE_WAITHANDLE_DISPOSE | o | x | x | x | x | x | x | x | x |
| Symbol | net35 | net40 | netstandard1.3 | netstandard2.0 | sl4 | sl5 | uap10 | wp8 | wp71 |
|---|---|---|---|---|---|---|---|---|---|
| FEATURE_DIRECTORYINFO_ENUMERATEFILES | o | x | x | x | x | x | x | o | o |
| FEATURE_MEMORYSTREAM_GETBUFFER | x | x | o | x | x | x | o | x | x |
| FEATURE_MEMORYSTREAM_TRYGETBUFFER | o | o | x | x | o | o | x | o | o |
| FEATURE_STREAM_TAP | o | o | x | x | o | o | x | x | o |
| FEATURE_STREAM_APM | x | x | o | x | x | x | o | x | x |
Remarks:
-
The following symbols are treated as mutually exclusive in the listed order:
- FEATURE_MEMORYSTREAM_GETBUFFER
- FEATURE_MEMORYSTREAM_TRYGETBUFFER
When, for example, both FEATURE_MEMORYSTREAM_GETBUFFER and FEATURE_MEMORYSTREAM_TRYGETBUFFER are defined for a given target framework, then FEATURE_MEMORYSTREAM_GETBUFFER will take precedence.
-
The following symbols are treated as mutually exclusive in the listed order:
- FEATURE_STREAM_TAP
- FEATURE_STREAM_APM
When, for example, both FEATURE_STREAM_TAP and FEATURE_STREAM_APM are defined for a given target framework, then FEATURE_STREAM_TAP will take precedence.
| Symbol | net35 | net40 | netstandard1.3 | netstandard2.0 | sl4 | sl5 | uap10 | wp8 | wp71 |
|---|---|---|---|---|---|---|---|---|---|
| FEATURE_DNS_TAP | o | o | x | x | o | o | o | o | o |
| FEATURE_DNS_APM | x | x | o | x | o | o | o | o | o |
| FEATURE_DNS_SYNC | x | x | o | x | o | o | o | o | o |
| FEATURE_DEVICEINFORMATION_APM | o | o | o | o | o | o | o | x | x |
| FEATURE_DATAGRAMSOCKET | o | o | o | o | o | o | x | o | o |
Remarks:
-
Name resolution is not supported on Silverlight 4 and 5.
-
The following symbols are treated as mutually exclusive in the listed order:
- FEATURE_DNS_SYNC
- FEATURE_DNS_APM
- FEATURE_DNS_TAP
When, for example, both FEATURE_DNS_SYNC and FEATURE_DNS_APM are defined for a given target framework, then FEATURE_DNS_SYNC will take precedence.
| Symbol | net35 | net40 | netstandard1.3 | netstandard2.0 | sl4 | sl5 | uap10 | wp8 | wp71 |
|---|---|---|---|---|---|---|---|---|---|
| FEATURE_SOCKET_TAP | o | o | x | x | o | o | o | o | o |
| FEATURE_SOCKET_EAP | x | x | x | x | x | x | x | x | x |
| FEATURE_SOCKET_APM | x | x | o | x | o | o | o | o | o |
| FEATURE_SOCKET_SYNC | x | x | x | x | o | o | o | o | o |
| FEATURE_SOCKET_POLL | x | x | x | x | o | o | o | o | o |
| FEATURE_SOCKET_SELECT | o | x | x | x | o | o | o | o | o |
| FEATURE_SOCKET_DISPOSE | o | x | x | x | x | x | x | x | x |
Remarks:
-
FEATURE_SOCKET_POLL is preferred over FEATURE_SOCKET_SELECT due to issues in:
- .NET Framework 3.5 (https://support.microsoft.com/kb/2615314)
- .NET Core up to 3.x (https://github.com/dotnet/runtime/issues/26957)
-
The following symbols are treated as mutually exclusive in the listed order:
- FEATURE_SOCKET_SYNC
- FEATURE_SOCKET_EAP
- FEATURE_SOCKET_APM
- FEATURE_SOCKET_TAP
When, for example, both FEATURE_SOCKET_SYNC and FEATURE_SOCKET_EAP are defined for a given target framework, then FEATURE_SOCKET_SYNC will take precedence.
| Symbol | net35 | net40 | netstandard1.3 | netstandard2.0 | sl4 | sl5 | uap10 | wp8 | wp71 |
|---|---|---|---|---|---|---|---|---|---|
| FEATURE_ENCODING_ASCII | x | x | x | x | o | o | x | o | o |
| FEATURE_REGEX_COMPILE | x | x | x | x | o | o | x | x | x |
| FEATURE_BINARY_SERIALIZATION | x | x | o | o | o | o | o | o | o |
| FEATURE_DIAGNOSTICS_TRACESOURCE | x | x | x | x | o | o | o | o | o |
| FEATURE_REFLECTION_TYPEINFO | o | o | x | o | o | o | x | o | o |
| FEATURE_STRINGBUILDER_CLEAR | o | x | x | x | o | o | x | o | o |