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namespace System.Workflow.Activities
{
using System;
using System.Reflection;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Drawing.Design;
using System.Workflow.ComponentModel;
using System.Workflow.ComponentModel.Design;
using System.Workflow.ComponentModel.Compiler;
using System.Runtime.Serialization;
using System.ComponentModel.Design.Serialization;
using System.Collections.Specialized;
using System.Collections.Generic;
using System.Workflow.Runtime;
using System.Runtime.Serialization.Formatters.Binary;
using System.Workflow.Activities.Common;
[SRDescription(SR.CallExternalMethodActivityDescription)]
[Designer(typeof(CallExternalMethodActivityDesigner), typeof(IDesigner))]
[DefaultEvent("MethodInvoking")]
[ActivityValidator(typeof(CallExternalMethodActivityValidator))]
[SRCategory(SR.Base)]
[Obsolete("The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*")]
public class CallExternalMethodActivity : Activity, IPropertyValueProvider, IDynamicPropertyTypeProvider
{
//instance properties
public static readonly DependencyProperty CorrelationTokenProperty = DependencyProperty.Register("CorrelationToken", typeof(CorrelationToken), typeof(CallExternalMethodActivity), new PropertyMetadata(DependencyPropertyOptions.Metadata));
public static readonly DependencyProperty ParameterBindingsProperty = DependencyProperty.Register("ParameterBindings", typeof(WorkflowParameterBindingCollection), typeof(CallExternalMethodActivity), new PropertyMetadata(DependencyPropertyOptions.Metadata | DependencyPropertyOptions.ReadOnly, new Attribute[] { new BrowsableAttribute(false), new DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Content) }));
//metadata properties
public static readonly DependencyProperty InterfaceTypeProperty = DependencyProperty.Register("InterfaceType", typeof(System.Type), typeof(CallExternalMethodActivity), new PropertyMetadata(null, DependencyPropertyOptions.Metadata, new Attribute[] { new ValidationOptionAttribute(ValidationOption.Required) }));
public static readonly DependencyProperty MethodNameProperty = DependencyProperty.Register("MethodName", typeof(string), typeof(CallExternalMethodActivity), new PropertyMetadata("", DependencyPropertyOptions.Metadata, new Attribute[] { new ValidationOptionAttribute(ValidationOption.Required) }));
//event
public static readonly DependencyProperty MethodInvokingEvent = DependencyProperty.Register("MethodInvoking", typeof(EventHandler), typeof(CallExternalMethodActivity));
internal static readonly ArrayList ReservedParameterNames = new ArrayList(new string[] { "Name", "Enabled", "Description", "MethodName", "MethodInvoking", "InterfaceType" });
#region Constructors
public CallExternalMethodActivity()
{
base.SetReadOnlyPropertyValue(ParameterBindingsProperty, new WorkflowParameterBindingCollection(this));
}
public CallExternalMethodActivity(string name)
: base(name)
{
base.SetReadOnlyPropertyValue(ParameterBindingsProperty, new WorkflowParameterBindingCollection(this));
}
#endregion
[SRCategory(SR.Activity)]
[SRDescription(SR.HelperExternalDataExchangeDesc)]
[RefreshProperties(RefreshProperties.All)]
[Editor(typeof(TypeBrowserEditor), typeof(UITypeEditor))]
[TypeFilterProviderAttribute(typeof(ExternalDataExchangeInterfaceTypeFilterProvider))]
[DefaultValue(null)]
public virtual Type InterfaceType
{
get
{
return base.GetValue(InterfaceTypeProperty) as Type;
}
set
{
base.SetValue(InterfaceTypeProperty, value);
}
}
[RefreshProperties(RefreshProperties.All)]
[TypeConverter(typeof(PropertyValueProviderTypeConverter))]
[SRCategory(SR.Activity)]
[SRDescription(SR.ExternalMethodNameDescr)]
[MergablePropertyAttribute(false)]
[DefaultValue("")]
public virtual string MethodName
{
get
{
return base.GetValue(MethodNameProperty) as string;
}
set
{
base.SetValue(MethodNameProperty, value);
}
}
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
[Browsable(false)]
public WorkflowParameterBindingCollection ParameterBindings
{
get
{
return base.GetValue(ParameterBindingsProperty) as WorkflowParameterBindingCollection;
}
}
[SRCategory(SR.Activity)]
[RefreshProperties(RefreshProperties.All)]
[SRDescription(SR.CorrelationSetDescr)]
[MergableProperty(false)]
[TypeConverter(typeof(CorrelationTokenTypeConverter))]
[DefaultValue(null)]
public virtual CorrelationToken CorrelationToken
{
get
{
return base.GetValue(CorrelationTokenProperty) as CorrelationToken;
}
set
{
base.SetValue(CorrelationTokenProperty, value);
}
}
[SRDescription(SR.OnBeforeMethodInvokeDescr)]
[SRCategory(SR.Handlers)]
[MergableProperty(false)]
public event EventHandler MethodInvoking
{
add
{
base.AddHandler(MethodInvokingEvent, value);
}
remove
{
base.RemoveHandler(MethodInvokingEvent, value);
}
}
ICollection IPropertyValueProvider.GetPropertyValues(ITypeDescriptorContext context)
{
StringCollection names = new StringCollection();
if (this.InterfaceType == null)
return names;
if (context.PropertyDescriptor.Name == "MethodName")
{
foreach (MethodInfo method in this.InterfaceType.GetMethods(BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public))
{
if (method.IsSpecialName)
continue;
names.Add(method.Name);
}
}
return names;
}
protected override void InitializeProperties()
{
ActivityHelpers.InitializeCorrelationTokenCollection(this, this.CorrelationToken);
Type type = this.InterfaceType;
if (type == null)
throw new InvalidOperationException(SR.GetString(SR.InterfaceTypeMissing, this.Name));
string methodName = this.MethodName;
if (methodName == null)
throw new InvalidOperationException(SR.GetString(SR.MethodNameMissing, this.Name));
MethodInfo methodInfo = type.GetMethod(methodName);
if (methodInfo != null)
InvokeHelper.InitializeParameters(methodInfo, this.ParameterBindings);
else
throw new InvalidOperationException(SR.GetString(SR.MethodInfoMissing, this.MethodName, this.InterfaceType.Name));
base.InitializeProperties();
}
protected virtual void OnMethodInvoking(EventArgs e)
{
}
protected virtual void OnMethodInvoked(EventArgs e)
{
}
protected sealed override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
if (executionContext == null)
throw new ArgumentNullException("executionContext");
if (this.InterfaceType == null)
throw new ArgumentException(
SR.GetString(SR.Error_MissingInterfaceType), "executionContext");
Type type = this.InterfaceType;
string methodName = this.MethodName;
object serviceValue = executionContext.GetService(type);
if (serviceValue == null)
throw new InvalidOperationException(SR.GetString(SR.Error_ServiceNotFound, this.InterfaceType));
this.RaiseEvent(MethodInvokingEvent, this, EventArgs.Empty);
OnMethodInvoking(EventArgs.Empty);
MethodInfo methodInfo = type.GetMethod(methodName, BindingFlags.Instance | BindingFlags.Public);
ParameterModifier[] parameterModifiers = null;
object[] actualParameters = InvokeHelper.GetParameters(methodInfo, this.ParameterBindings, out parameterModifiers);
WorkflowParameterBinding resultBinding = null;
if (this.ParameterBindings.Contains("(ReturnValue)"))
resultBinding = this.ParameterBindings["(ReturnValue)"];
CorrelationService.InvalidateCorrelationToken(this, type, methodName, actualParameters);
object result = type.InvokeMember(this.MethodName, BindingFlags.InvokeMethod, new ExternalDataExchangeBinder(), serviceValue, actualParameters, parameterModifiers, null, null);
if (resultBinding != null)
resultBinding.Value = InvokeHelper.CloneOutboundValue(result, new BinaryFormatter(), "(ReturnValue)");
InvokeHelper.SaveOutRefParameters(actualParameters, methodInfo, this.ParameterBindings);
OnMethodInvoked(EventArgs.Empty);
return ActivityExecutionStatus.Closed;
}
#region IDynamicPropertyTypeProvider
Type IDynamicPropertyTypeProvider.GetPropertyType(IServiceProvider serviceProvider, string propertyName)
{
if (propertyName == null)
throw new ArgumentNullException("propertyName");
Dictionary<string, object> parameters = new Dictionary<string, object>();
this.GetParameterPropertyDescriptors(parameters);
if (parameters.ContainsKey(propertyName))
{
ParameterInfoBasedPropertyDescriptor descriptor = parameters[propertyName] as ParameterInfoBasedPropertyDescriptor;
if (descriptor != null)
return descriptor.ParameterType;
}
return null;
}
AccessTypes IDynamicPropertyTypeProvider.GetAccessType(IServiceProvider serviceProvider, string propertyName)
{
if (propertyName == null)
throw new ArgumentNullException("propertyName");
return AccessTypes.Read;
}
internal void GetParameterPropertyDescriptors(IDictionary properties)
{
if (((IComponent)this).Site == null)
return;
ITypeProvider typeProvider = (ITypeProvider)((IComponent)this).Site.GetService(typeof(ITypeProvider));
if (typeProvider == null)
throw new InvalidOperationException(SR.GetString(SR.General_MissingService, typeof(ITypeProvider).FullName));
if (this.GetType() != typeof(CallExternalMethodActivity))
return; // if custom activity do not add parameter binding
Type type = this.InterfaceType;
if (type == null)
return;
MethodInfo method = type.GetMethod(this.MethodName);
if (method != null)
{
ArrayList paramInfo = new ArrayList(method.GetParameters());
if (!(method.ReturnType == typeof(void)))
paramInfo.Add(method.ReturnParameter);
foreach (ParameterInfo param in paramInfo)
{
if (param.ParameterType != null)
{
PropertyDescriptor prop = new ParameterInfoBasedPropertyDescriptor(typeof(CallExternalMethodActivity), param, true, DesignOnlyAttribute.Yes);
properties[prop.Name] = prop;
}
}
}
}
#endregion
}
[Obsolete("The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*")]
public class CallExternalMethodActivityValidator : ActivityValidator
{
public override ValidationErrorCollection Validate(ValidationManager manager, object obj)
{
CallExternalMethodActivity methodInvoke = obj as CallExternalMethodActivity;
if (methodInvoke == null)
throw new ArgumentException(SR.GetString(SR.Error_UnexpectedArgumentType, typeof(CallExternalMethodActivity).FullName), "obj");
ValidationErrorCollection validationErrors = base.Validate(manager, obj);
validationErrors.AddRange(CorrelationSetsValidator.Validate(manager, obj));
validationErrors.AddRange(ParameterBindingValidator.Validate(manager, obj));
return validationErrors;
}
}
}
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