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using System;
using System.Reflection;
using System.Collections;
using System.Diagnostics;
using System.Workflow.ComponentModel;
using System.Workflow.Runtime;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
namespace System.Workflow.Activities
{
internal static class InvokeHelper
{
internal static void InitializeParameters(MethodInfo methodBase, WorkflowParameterBindingCollection parameterBindings)
{
ParameterInfo[] parameters = methodBase.GetParameters();
foreach (ParameterInfo parameter in parameters)
{
if (!parameterBindings.Contains(parameter.Name))
parameterBindings.Add(new WorkflowParameterBinding(parameter.Name));
}
if (methodBase.ReturnType != typeof(void))
{
if (!parameterBindings.Contains("(ReturnValue)"))
parameterBindings.Add(new WorkflowParameterBinding("(ReturnValue)"));
}
}
internal static object[] GetParameters(MethodBase methodBase, WorkflowParameterBindingCollection parameterBindings)
{
ParameterInfo[] formalParameters = methodBase.GetParameters();
object[] actualParameters = new object[formalParameters.Length];
int index = 0;
foreach (ParameterInfo formalParameter in formalParameters)
{
if (parameterBindings.Contains(formalParameter.Name))
{
WorkflowParameterBinding binding = parameterBindings[formalParameter.Name];
actualParameters[index] = binding.Value;
}
index++;
}
return actualParameters;
}
internal static object[] GetParameters(MethodBase methodBase, WorkflowParameterBindingCollection parameterBindings, out ParameterModifier[] parameterModifiers)
{
ParameterInfo[] formalParameters = methodBase.GetParameters();
object[] actualParameters = new object[formalParameters.Length];
if (actualParameters.Length == 0)
{
parameterModifiers = new ParameterModifier[0];
return actualParameters;
}
int index = 0;
BinaryFormatter formatter = null;
ParameterModifier parameterModifier = new ParameterModifier(actualParameters.Length);
foreach (ParameterInfo formalParameter in formalParameters)
{
if (formalParameter.ParameterType.IsByRef)
{
parameterModifier[index] = true;
}
else
{
parameterModifier[index] = false;
}
if (parameterBindings.Contains(formalParameter.Name))
{
WorkflowParameterBinding binding = parameterBindings[formalParameter.Name];
if (formatter == null)
formatter = new BinaryFormatter();
actualParameters[index] = CloneOutboundValue(binding.Value, formatter, formalParameter.Name);
}
index++;
}
parameterModifiers = new ParameterModifier[1] { parameterModifier };
return actualParameters;
}
internal static object CloneOutboundValue(object source, BinaryFormatter formatter, string name)
{
if (source == null || source.GetType().IsValueType)
return source;
ICloneable clone = source as ICloneable;
if (clone != null)
return clone.Clone();
System.IO.MemoryStream stream = new System.IO.MemoryStream(1024);
try
{
formatter.Serialize(stream, source);
}
catch (SerializationException e)
{
throw new InvalidOperationException(SR.GetString(SR.Error_CallExternalMethodArgsSerializationException, name), e);
}
stream.Position = 0;
object cloned = formatter.Deserialize(stream);
return cloned;
}
internal static void SaveOutRefParameters(object[] actualParameters, MethodBase methodBase, WorkflowParameterBindingCollection parameterBindings)
{
int index = 0;
BinaryFormatter formatter = null;
foreach (ParameterInfo formalParameter in methodBase.GetParameters())
{
if (parameterBindings.Contains(formalParameter.Name))
{
if (formalParameter.ParameterType.IsByRef || (formalParameter.IsIn && formalParameter.IsOut))
{
WorkflowParameterBinding binding = parameterBindings[formalParameter.Name];
if (formatter == null)
formatter = new BinaryFormatter();
binding.Value = CloneOutboundValue(actualParameters[index], formatter, formalParameter.Name);
}
}
index++;
}
}
}
}
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