DynamicActivityTypeDescriptor.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / DynamicActivityTypeDescriptor.cs / 1305376 / DynamicActivityTypeDescriptor.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities 
{
    using System; 
    using System.Collections; 
    using System.Collections.Generic;
    using System.Collections.ObjectModel; 
    using System.ComponentModel;
    using System.Xml.Linq;

    class DynamicActivityTypeDescriptor : ICustomTypeDescriptor 
    {
        PropertyDescriptorCollection cachedProperties; 
        Activity owner; 

        public DynamicActivityTypeDescriptor(Activity owner) 
        {
            this.owner = owner;
            this.Properties = new ActivityPropertyCollection(this);
        } 

        public string Name 
        { 
            get;
            set; 
        }

        public KeyedCollection Properties
        { 
            get;
            private set; 
        } 

        public AttributeCollection GetAttributes() 
        {
            return TypeDescriptor.GetAttributes(this.owner, true);
        }
 
        public string GetClassName()
        { 
            if (this.Name != null) 
            {
                return this.Name; 
            }

            return TypeDescriptor.GetClassName(this.owner, true);
        } 

        public string GetComponentName() 
        { 
            return TypeDescriptor.GetComponentName(this.owner, true);
        } 

        public TypeConverter GetConverter()
        {
            return TypeDescriptor.GetConverter(this.owner, true); 
        }
 
        public EventDescriptor GetDefaultEvent() 
        {
            return TypeDescriptor.GetDefaultEvent(this.owner, true); 
        }

        public PropertyDescriptor GetDefaultProperty()
        { 
            return TypeDescriptor.GetDefaultProperty(this.owner, true);
        } 
 
        public object GetEditor(Type editorBaseType)
        { 
            return TypeDescriptor.GetEditor(this.owner, editorBaseType, true);
        }

        public EventDescriptorCollection GetEvents(Attribute[] attributes) 
        {
            return TypeDescriptor.GetEvents(this.owner, attributes, true); 
        } 

        public EventDescriptorCollection GetEvents() 
        {
            return TypeDescriptor.GetEvents(this.owner, true);
        }
 
        public PropertyDescriptorCollection GetProperties()
        { 
            return GetProperties(null); 
        }
 
        public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
        {
            PropertyDescriptorCollection result = this.cachedProperties;
            if (result != null) 
            {
                return result; 
            } 

            PropertyDescriptorCollection dynamicProperties; 
            if (attributes != null)
            {
                dynamicProperties = TypeDescriptor.GetProperties(this.owner, attributes, true);
            } 
            else
            { 
                dynamicProperties = TypeDescriptor.GetProperties(this.owner, true); 
            }
 
            // initial capacity is Properties + Name + Body
            List propertyDescriptors = new List(this.Properties.Count + 2);
            for (int i = 0; i < dynamicProperties.Count; i++)
            { 
                PropertyDescriptor dynamicProperty = dynamicProperties[i];
                if (dynamicProperty.IsBrowsable) 
                { 
                    propertyDescriptors.Add(dynamicProperty);
                } 
            }

            foreach (DynamicActivityProperty property in Properties)
            { 
                if (string.IsNullOrEmpty(property.Name))
                { 
                    throw FxTrace.Exception.AsError(new ValidationException(SR.ActivityPropertyRequiresName(this.owner.DisplayName))); 
                }
                if (property.Type == null) 
                {
                    throw FxTrace.Exception.AsError(new ValidationException(SR.ActivityPropertyRequiresType(this.owner.DisplayName)));
                }
                propertyDescriptors.Add(new DynamicActivityPropertyDescriptor(property, this.owner.GetType())); 
            }
 
            result = new PropertyDescriptorCollection(propertyDescriptors.ToArray()); 
            this.cachedProperties = result;
            return result; 
        }

        public object GetPropertyOwner(PropertyDescriptor pd)
        { 
            return this.owner;
        } 
 
        class DynamicActivityPropertyDescriptor : PropertyDescriptor
        { 
            AttributeCollection attributes;
            DynamicActivityProperty activityProperty;
            Type componentType;
 
            public DynamicActivityPropertyDescriptor(DynamicActivityProperty activityProperty, Type componentType)
                : base(activityProperty.Name, null) 
            { 
                this.activityProperty = activityProperty;
                this.componentType = componentType; 
            }

            public override Type ComponentType
            { 
                get
                { 
                    return this.componentType; 
                }
            } 

            public override AttributeCollection Attributes
            {
                get 
                {
                    if (this.attributes == null) 
                    { 
                        AttributeCollection inheritedAttributes = base.Attributes;
                        Collection propertyAttributes = this.activityProperty.Attributes; 
                        Attribute[] totalAttributes = new Attribute[inheritedAttributes.Count + propertyAttributes.Count + 1];
                        inheritedAttributes.CopyTo(totalAttributes, 0);
                        propertyAttributes.CopyTo(totalAttributes, inheritedAttributes.Count);
                        totalAttributes[inheritedAttributes.Count + propertyAttributes.Count] = new DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Hidden); 
                        this.attributes = new AttributeCollection(totalAttributes);
                    } 
                    return this.attributes; 
                }
            } 

            public override bool IsReadOnly
            {
                get 
                {
                    return false; 
                } 
            }
 
            public override Type PropertyType
            {
                get
                { 
                    return this.activityProperty.Type;
                } 
            } 

            public override object GetValue(object component) 
            {
                IDynamicActivity owner = component as IDynamicActivity;
                if (owner == null || !owner.Properties.Contains(this.activityProperty))
                { 
                    throw FxTrace.Exception.AsError(new InvalidOperationException(SR.InvalidDynamicActivityProperty(this.Name)));
                } 
 
                return this.activityProperty.Value;
            } 

            public override void SetValue(object component, object value)
            {
                IDynamicActivity owner = component as IDynamicActivity; 
                if (owner == null || !owner.Properties.Contains(this.activityProperty))
                { 
                    throw FxTrace.Exception.AsError(new InvalidOperationException(SR.InvalidDynamicActivityProperty(this.Name))); 
                }
 
                this.activityProperty.Value = value;
            }

            public override bool CanResetValue(object component) 
            {
                return false; 
            } 

            public override void ResetValue(object component) 
            {
            }

            public override bool ShouldSerializeValue(object component) 
            {
                return false; 
            } 

            protected override void FillAttributes(IList attributeList) 
            {
                if (attributeList == null)
                {
                    throw FxTrace.Exception.ArgumentNull("attributeList"); 
                }
 
                attributeList.Add(new DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Hidden)); 
            }
        } 

        class ActivityPropertyCollection : KeyedCollection
        {
            DynamicActivityTypeDescriptor parent; 

            public ActivityPropertyCollection(DynamicActivityTypeDescriptor parent) 
                : base() 
            {
                this.parent = parent; 
            }

            protected override void InsertItem(int index, DynamicActivityProperty item)
            { 
                if (item == null)
                { 
                    throw FxTrace.Exception.ArgumentNull("item"); 
                }
 
                if (this.Contains(item.Name))
                {
                    throw FxTrace.Exception.AsError(new ArgumentException(SR.DynamicActivityDuplicatePropertyDetected(item.Name), "item"));
                } 

                InvalidateCache(); 
                base.InsertItem(index, item); 
            }
 
            protected override void SetItem(int index, DynamicActivityProperty item)
            {
                if (item == null)
                { 
                    throw FxTrace.Exception.ArgumentNull("item");
                } 
 
                // We don't want self-assignment to throw. Note that if this[index] has the same
                // name as item, no other element in the collection can. 
                if (!this[index].Name.Equals(item.Name) && this.Contains(item.Name))
                {
                    throw FxTrace.Exception.AsError(new ArgumentException(SR.DynamicActivityDuplicatePropertyDetected(item.Name), "item"));
                } 

                InvalidateCache(); 
                base.SetItem(index, item); 
            }
 
            protected override void RemoveItem(int index)
            {
                InvalidateCache();
                base.RemoveItem(index); 
            }
 
            protected override void ClearItems() 
            {
                InvalidateCache(); 
                base.ClearItems();
            }

            protected override string GetKeyForItem(DynamicActivityProperty item) 
            {
                return item.Name; 
            } 

            void InvalidateCache() 
            {
                this.parent.cachedProperties = null;
            }
        } 
    }
} 
 


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DynamicActivityTypeDescriptor.cs source code in C# .NET

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