/// <summary>
/// try to create delegate using IL generation
/// </summary>
/// <param name="expressionContext">expression context</param>
/// <param name="finalExpression">final expression to convert</param>
/// <param name="newDelegate">created delegate</param>
/// <returns>true if delegate was created</returns>
public virtual bool TryCreateDelegate(IActivationExpressionResult expressionContext, Expression finalExpression,
out ActivationStrategyDelegate newDelegate)
{
newDelegate = null;
try
{
var request = new DynamicMethodGenerationRequest(expressionContext, TryGenerateIL);
var constants = new List <object>();
if (!ImplementationFactory.Locate <IConstantExpressionCollector>().GetConstantExpressions(finalExpression, constants))
{
return(false);
}
request.Constants = constants;
var target = ImplementationFactory.Locate <IDynamicMethodTargetCreator>().CreateMethodTarget(request);
if (target == null)
{
return(false);
}
request.Target = target;
var method = new DynamicMethod(string.Empty,
typeof(object),
new[]
{
target.GetType(),
typeof(IExportLocatorScope),
typeof(IDisposalScope),
typeof(IInjectionContext)
},
target.GetType(),
true);
request.ILGenerator = method.GetILGenerator();
if (!TryGenerateIL(request, finalExpression))
{
return(false);
}
request.ILGenerator.Emit(OpCodes.Ret);
newDelegate = (ActivationStrategyDelegate)method.CreateDelegate(typeof(ActivationStrategyDelegate), target);
return(true);
}
catch (Exception)
{
// ignore exception and compile linq expression normally
}
return(false);
}
/// <summary>
/// try to create delegate using IL generation
/// </summary>
/// <param name="expressionContext">expression context</param>
/// <param name="parameters"></param>
/// <param name="extraExpressions"></param>
/// <param name="finalExpression">final expression to convert</param>
/// <param name="newDelegate">created delegate</param>
/// <returns>true if delegate was created</returns>
public virtual bool TryCreateDelegate(IActivationExpressionResult expressionContext, ParameterExpression[] parameters, Expression[] extraExpressions, Expression finalExpression, out ActivationStrategyDelegate newDelegate)
{
newDelegate = null;
try
{
var request = new DynamicMethodGenerationRequest(expressionContext, TryGenerateIL, parameters);
var constants = new List <object>();
foreach (var expression in extraExpressions)
{
if (!ImplementationFactory.Locate <IConstantExpressionCollector>().GetConstantExpressions(expression, constants))
{
return(false);
}
}
if (!ImplementationFactory.Locate <IConstantExpressionCollector>().GetConstantExpressions(finalExpression, constants))
{
return(false);
}
request.Constants = constants;
var target = ImplementationFactory.Locate <IDynamicMethodTargetCreator>().CreateMethodTarget(request);
if (target == null)
{
return(false);
}
request.Target = target;
var method = new DynamicMethod(string.Empty,
typeof(object),
new[]
{
target.GetType(),
typeof(IExportLocatorScope),
typeof(IDisposalScope),
typeof(IInjectionContext)
},
target.GetType(),
true);
request.ILGenerator = method.GetILGenerator();
foreach (var parameter in parameters)
{
request.ILGenerator.DeclareLocal(parameter.Type);
}
foreach (var expression in extraExpressions)
{
if (!TryGenerateIL(request, expression))
{
return(false);
}
}
if (!TryGenerateIL(request, finalExpression))
{
return(false);
}
request.ILGenerator.Emit(OpCodes.Ret);
newDelegate = (ActivationStrategyDelegate)method.CreateDelegate(typeof(ActivationStrategyDelegate), target);
return(true);
}
catch (Exception exp)
{
expressionContext.Request.RequestingScope.ScopeConfiguration.Trace?.Invoke($"Exception thrown while compiling dynamic method {exp.Message}");
}
return(false);
}
/// <summary>
/// try to create delegate using IL generation
/// </summary>
/// <param name="expressionContext">expression context</param>
/// <param name="parameters"></param>
/// <param name="extraExpressions"></param>
/// <param name="finalExpression">final expression to convert</param>
/// <param name="newDelegateType">created delegate</param>
/// <returns>true if delegate was created</returns>
public virtual Delegate TryCreateDelegate(IActivationExpressionResult expressionContext, ParameterExpression[] parameters, Expression[] extraExpressions, Expression finalExpression, Type newDelegateType)
{
try
{
var request = new DynamicMethodGenerationRequest(expressionContext, TryGenerateIL, parameters);
var constants = new List <object>();
foreach (var expression in extraExpressions)
{
if (!ImplementationFactory.Locate <IConstantExpressionCollector>().GetConstantExpressions(expression, constants))
{
return(null);
}
}
if (!ImplementationFactory.Locate <IConstantExpressionCollector>().GetConstantExpressions(finalExpression, constants))
{
return(null);
}
request.Constants = constants;
var target = ImplementationFactory.Locate <IDynamicMethodTargetCreator>().CreateMethodTarget(request);
request.Target = target;
var invokeMethod = newDelegateType.GetTypeInfo().GetDeclaredMethod("Invoke");
var parameterTypes = new List <Type>();
if (target != null)
{
parameterTypes.Add(target.GetType());
}
parameterTypes.AddRange(invokeMethod.GetParameters().Select(p => p.ParameterType));
var method = new DynamicMethod(string.Empty,
invokeMethod.ReturnType,
parameterTypes.ToArray(),
typeof(LinqToDynamicMethodConverter),
true);
request.ILGenerator = method.GetILGenerator();
foreach (var parameter in parameters)
{
request.ILGenerator.DeclareLocal(parameter.Type);
}
foreach (var expression in extraExpressions)
{
if (!TryGenerateIL(request, expression))
{
return(null);
}
}
if (!TryGenerateIL(request, finalExpression))
{
return(null);
}
request.ILGenerator.Emit(OpCodes.Ret);
return(method.CreateDelegate(newDelegateType, target));
}
catch (Exception exp)
{
expressionContext.Request.RequestingScope.ScopeConfiguration.Trace?.Invoke($"Exception thrown while compiling dynamic method {exp.Message}");
}
return(null);
}
