private static HostedCompiler GetCachedHostedCompiler(HashSet <Assembly> assemblySet)
{
if (HostedCompilerCache == null)
{
IEqualityComparer <HashSet <Assembly> > comparer = HashSet <Assembly> .CreateSetComparer();
HostedCompilerCache = new Dictionary <HashSet <Assembly>, HostedCompiler>(10, comparer);
}
lock (HostedCompilerCache)
{
HostedCompiler compiler;
if (!HostedCompilerCache.TryGetValue(assemblySet, out compiler))
{
if (HostedCompilerCache.Count >= 10)
{
HashSet <Assembly> key = HostedCompilerCache.Keys.ElementAtOrDefault <HashSet <Assembly> >(1);
HostedCompilerCache.Remove(key);
}
compiler = new HostedCompiler(assemblySet.ToList <Assembly>());
HostedCompilerCache[assemblySet] = compiler;
}
return(compiler);
}
}
public Expression <Func <ActivityContext, T> > Compile <T>(LocationReferenceEnvironment environment)
{
CompilerResults results;
Type type = typeof(T);
this.environment = environment;
if (this.referencedAssemblies == null)
{
this.referencedAssemblies = new HashSet <Assembly>();
}
this.referencedAssemblies.UnionWith(DefaultReferencedAssemblies);
List <Import> importList = new List <Import>();
foreach (string str in this.namespaceImports)
{
if (!string.IsNullOrEmpty(str))
{
importList.Add(new Import(str));
}
}
HashSet <Type> typeReferences = null;
EnsureTypeReferenced(type, ref typeReferences);
foreach (Type type2 in typeReferences)
{
this.referencedAssemblies.Add(type2.Assembly);
}
VisualBasicScriptAndTypeScope scriptScope = new VisualBasicScriptAndTypeScope(this.environment, this.referencedAssemblies.ToList <Assembly>());
IImportScope importScope = new VisualBasicImportScope(importList);
CompilerOptions options = new CompilerOptions {
OptionStrict = OptionStrictSetting.On
};
CompilerContext context = new CompilerContext(scriptScope, scriptScope, importScope, options);
HostedCompiler cachedHostedCompiler = GetCachedHostedCompiler(this.referencedAssemblies);
lock (cachedHostedCompiler)
{
try
{
results = cachedHostedCompiler.CompileExpression(this.textToCompile, context, type);
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
FxTrace.Exception.TraceUnhandledException(exception);
throw;
}
}
if (scriptScope.ErrorMessage != null)
{
throw FxTrace.Exception.AsError(new SourceExpressionException(System.Activities.SR.CompilerErrorSpecificExpression(this.textToCompile, scriptScope.ErrorMessage)));
}
if ((results.Errors != null) && (results.Errors.Count > 0))
{
StringBuilder builder = new StringBuilder();
builder.AppendLine();
foreach (Microsoft.Compiler.VisualBasic.Error error in results.Errors)
{
builder.AppendLine(error.Description);
}
throw FxTrace.Exception.AsError(new SourceExpressionException(System.Activities.SR.CompilerErrorSpecificExpression(this.textToCompile, builder.ToString())));
}
LambdaExpression codeBlock = results.CodeBlock;
if (codeBlock == null)
{
return(null);
}
Expression expression = this.Rewrite(codeBlock.Body, null);
ParameterExpression[] parameters = new ParameterExpression[] { FindParameter(expression) ?? ExpressionUtilities.RuntimeContextParameter };
return(Expression.Lambda <Func <ActivityContext, T> >(expression, parameters));
}