private SvgDocument CreateDocument(string userCode)
{
var source = $@"using System;
using System.Drawing;
using System.IO;
using Svg;
class Program
{{
public static SvgDocument CreateDocument()
{{
SvgDocument svgDoc = null;
{userCode}
return svgDoc;
}}
}}
";
var sourcePath = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly()?.Location ?? string.Empty);
var sourceText = SourceText.From(source, Encoding.UTF8);
var options = CSharpParseOptions.Default
.WithLanguageVersion(LanguageVersion.CSharp8);
var syntaxTree = CSharpSyntaxTree.ParseText(
sourceText,
options
)
.WithFilePath(Path.Combine(sourcePath, "Program.cs"));
var runtimeDirectoryPath = System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory();
var references = new MetadataReference[]
{
MetadataReference.CreateFromFile(typeof(object).Assembly.Location),
MetadataReference.CreateFromFile(Path.Combine(runtimeDirectoryPath, "mscorlib.dll")),
MetadataReference.CreateFromFile(Path.Combine(runtimeDirectoryPath, "System.Runtime.dll")),
#if NETFRAMEWORK
MetadataReference.CreateFromFile(Path.Combine(runtimeDirectoryPath, "System.Drawing.dll")),
MetadataReference.CreateFromFile(Path.Combine(runtimeDirectoryPath, "System.Xml.dll")),
#else
MetadataReference.CreateFromFile(Path.Combine(runtimeDirectoryPath, "System.Drawing.Primitives.dll")),
MetadataReference.CreateFromFile(Path.Combine(runtimeDirectoryPath, "System.Private.Xml.dll")),
MetadataReference.CreateFromFile(Path.Combine(runtimeDirectoryPath, "System.Xml.ReaderWriter.dll")),
#endif
MetadataReference.CreateFromFile(Path.Combine(sourcePath, "Svg.dll")),
};
var compilationOptions = new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary)
.WithOptimizationLevel(OptimizationLevel.Release);
var compilation = CSharpCompilation.Create(
"ConsoleApp",
new[] { syntaxTree },
references,
compilationOptions);
using (var stream = new MemoryStream())
{
var emitResult = compilation.Emit(stream);
if (!emitResult.Success)
{
var messages = new StringBuilder();
foreach (var diagnostic in emitResult.Diagnostics)
{
var pos = diagnostic.Location.GetLineSpan();
var location = $"({pos.StartLinePosition.Line + 1 - 10},{pos.StartLinePosition.Character + 1})";
messages.AppendLine($"{location}: {diagnostic.Severity} {diagnostic.Id}: {diagnostic.GetMessage()}");
}
throw new InvalidProgramException(messages.ToString());
}
#if !NETFRAMEWORK
var assemblyLoadContext = new System.Runtime.Loader.AssemblyLoadContext(compilation.AssemblyName, true);
#endif
try
{
stream.Seek(0, SeekOrigin.Begin);
#if NETFRAMEWORK
var assembly = System.Reflection.Assembly.Load(stream.ToArray());
#else
var assembly = assemblyLoadContext.LoadFromStream(stream);
#endif
var type = assembly.GetType("Program");
var method = type?.GetMethod("CreateDocument");
return(method?.Invoke(null, null) as SvgDocument);
}
catch (Exception ex)
{
throw ex.InnerException ?? ex;
}
#if !NETFRAMEWORK
finally
{
assemblyLoadContext.Unload();
}
#endif
}
}
/// <inheritdoc />
public IAssembly LoadFromStream(Stream assembly)
{
return(Assembly.ToIAssembly(
assemblyLoadContext.LoadFromStream(assembly)
));
}