fix: Add NextBytes(Span<byte>) to RandomSource

src/Numerics/Numerics.csproj

@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
  <OutputType>Library</OutputType>
- <TargetFrameworks>net5.0;net461;net48;netstandard2.0</TargetFrameworks>
+ <TargetFrameworks>net5.0;netcoreapp2.1;net461;net48;netstandard2.1;netstandard2.0</TargetFrameworks>
  <AssemblyName>MathNet.Numerics</AssemblyName>
  <RootNamespace>MathNet.Numerics</RootNamespace>
  <IsPackable>true</IsPackable>

src/Numerics/Random/RandomSource.cs

@@ -470,6 +470,27 @@ public sealed override void NextBytes(byte[] buffer)
  DoSampleBytes(buffer);
  }
 
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ /// <summary>
+ /// Fills the elements of a specified array of bytes with random numbers.
+ /// </summary>
+ /// <param name="buffer">An array of bytes to contain random numbers.</param>
+ public sealed override void NextBytes(Span<byte> buffer)
+ {
+ if (_threadSafe)
+ {
+ lock (_lock)
+ {
+ DoSampleBytes(buffer);
+ }
+
+ return;
+ }
+
+ DoSampleBytes(buffer);
+ }
+#endif
+
  /// <summary>
  /// Returns a random number between 0.0 and 1.0.
  /// </summary>
@@ -511,6 +532,18 @@ protected virtual void DoSampleBytes(byte[] buffer)
  }
  }
 
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+ /// <summary>
+ /// Fills the elements of a specified array of bytes with random numbers in full range, including zero and 255 (<see cref="F:System.Byte.MaxValue"/>).
+ /// </summary>
+ protected virtual void DoSampleBytes(Span<byte> buffer)
+ {
+ var temp = new byte[buffer.Length];
+ DoSampleBytes(temp);
+ temp.CopyTo(buffer);
+ }
+#endif
+
  /// <summary>
  /// Returns a random N-bit signed integer greater than or equal to zero and less than 2^N.
  /// N (bit count) is expected to be greater than zero and less than 32 (not verified).