NamespaceListProperty.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / NamespaceListProperty.cs / 1438166 / NamespaceListProperty.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities.Presentation 
{
    using System.Collections; 
    using System.Collections.Generic; 
    using System.Runtime;
    using System.ComponentModel; 
    using Microsoft.VisualBasic.Activities;
    using System.Activities.Presentation.View;

    class NamespaceListPropertyDescriptor : PropertyDescriptor 
    {
        public const string ImportCollectionPropertyName = "Imports"; 
        public const string AvailableNamespacesPropertyName = "AvailableNamespaces"; 
        public const string NamespacePropertyName = "Namespace";
 
        object instance;

        public NamespaceListPropertyDescriptor(object instance)
            : base(ImportCollectionPropertyName, null) 
        {
            this.instance = instance; 
        } 

        public override Type ComponentType 
        {
            get { return this.instance.GetType(); }
        }
 
        public override bool IsReadOnly
        { 
            get 
            {
                return true; 
            }
        }

        public override Type PropertyType 
        {
            get 
            { 
                return typeof(NamespaceList);
            } 
        }

        public override bool IsBrowsable
        { 
            get
            { 
                return false; 
            }
        } 

        public override bool CanResetValue(object component)
        {
            return false; 
        }
 
        public override object GetValue(object component) 
        {
            VisualBasicSettings settings = VisualBasic.GetSettings(component); 
            if (settings == null)
            {
                settings = new VisualBasicSettings();
                VisualBasic.SetSettings(component, settings); 
            }
 
            return new NamespaceList(settings.ImportReferences); 
        }
 
        public override void ResetValue(object component)
        {
            VisualBasic.SetSettings(component, null);
        } 

        public override void SetValue(object component, object value) 
        { 
            throw FxTrace.Exception.AsError(new NotSupportedException());
        } 

        public override bool ShouldSerializeValue(object component)
        {
            throw FxTrace.Exception.AsError(new NotSupportedException()); 
        }
 
        protected override void FillAttributes(IList attributeList) 
        {
            attributeList.Add(new BrowsableAttribute(false)); 
            base.FillAttributes(attributeList);
        }
    }
 
    class NamespaceData
    { 
        public string Namespace 
        {
            get; 
            set;
        }

        //Used by screen reader 
        public override string ToString()
        { 
            return this.Namespace; 
        }
    } 

    //an adaptor to adapt a VisualBasicImportReference set to a list with unique namespaces
    class NamespaceList : IList
    { 
        //Since XAML generated by designer will almost always have some designer type in it, designer namespaces will appear in XAML.
        //And because Runtime design could not destinguish namespaces coming from XAML serialization between namespaces added by users, 
        //designer namespaces will show up in import designer. This is bad user experience because most WF project won't reference designer 
        //assembly. We could safely assume that customers won't use designer namespaces and type in their WF expressions, so we simply
        //---- designer namespaces out of the namespace list 
        static readonly string[] ----edAssemblies = new string[]
        {
            typeof(ViewStateService).Assembly.GetName().FullName,
            typeof(ViewStateService).Assembly.GetName().Name, 
        };
 
        ISet importReferences; 
        //list of uniqueNamespaces, the element is a tuple of the namespace and a arbitary data for consumer to use
        List uniqueNamespaces = new List(); 
        Dictionary> availableNamespaces;

        public NamespaceList(ISet importReferences)
        { 
            this.importReferences = importReferences;
 
            foreach (string ----edAssembly in ----edAssemblies) 
            {
                RemoveAssemblyFromSet(----edAssembly); 
            }
            foreach (VisualBasicImportReference import in importReferences)
            {
                if (Lookup(import.Import) == -1) 
                {
                    uniqueNamespaces.Add(new NamespaceData { Namespace = import.Import }); 
                } 
            }
        } 

        public Dictionary> AvailableNamespaces
        {
            get 
            {
                if (availableNamespaces == null) 
                { 
                    availableNamespaces = new Dictionary>();
                } 

                return availableNamespaces;
            }
        } 

        IEnumerable GetVisualBasicImportReferences(string importNamespace) 
        { 
            List imports = new List();
            List assemblies; 
            //in rehost cases or when some assembiles are not referenced, we may not find that namespace
            if (!this.AvailableNamespaces.TryGetValue(importNamespace, out assemblies))
            {
                return imports; 
            }
 
            foreach (string assembly in assemblies) 
            {
                imports.Add(new VisualBasicImportReference 
                {
                    Import = importNamespace,
                    Assembly = assembly
                }); 
            }
            return imports; 
        } 

        internal void UpdateAssemblyInfo(string importedNamespace) 
        {
            if (this.Lookup(importedNamespace) != -1)
            {
                this.importReferences.UnionWith(GetVisualBasicImportReferences(importedNamespace)); 
            }
            else 
            { 
                Fx.Assert ("UpdateAssemblyInfor should only be called for existed namespace");
            } 
        }

        internal int Lookup(string ns)
        { 
            for (int i = 0; i < this.uniqueNamespaces.Count; i++)
            { 
                if (this.uniqueNamespaces[i].Namespace == ns) 
                {
                    return i; 
                }
            }

            return -1; 
        }
 
        void RemoveNamespaceFromSet(string ns) 
        {
            List toRemoves = new List(); 
            foreach (VisualBasicImportReference import in this.importReferences)
            {
                if (import.Import == ns)
                { 
                    toRemoves.Add(import);
                } 
            } 

            foreach (VisualBasicImportReference toRemove in toRemoves) 
            {
                this.importReferences.Remove(toRemove);
            }
        } 

        void RemoveAssemblyFromSet(string assembly) 
        { 
            List toRemoves = new List();
            foreach (VisualBasicImportReference import in this.importReferences) 
            {
                if (import.Assembly == assembly)
                {
                    toRemoves.Add(import); 
                }
            } 
 
            foreach (VisualBasicImportReference toRemove in toRemoves)
            { 
                this.importReferences.Remove(toRemove);
            }
        }
 
        public int Add(object value)
        { 
            NamespaceData ns = value as NamespaceData; 
            if (ns == null)
            { 
                throw FxTrace.Exception.AsError(new ArgumentException(SR.NamespaceListArgumentMustBeNamespaceData, "value"));
            }

            if (Lookup(ns.Namespace) == -1) 
            {
                this.importReferences.UnionWith(GetVisualBasicImportReferences(ns.Namespace)); 
                return ((IList)this.uniqueNamespaces).Add(ns); 
            }
            else 
            {
                return -1;
            }
        } 

        public void Clear() 
        { 
            this.importReferences.Clear();
            this.uniqueNamespaces.Clear(); 
        }

        public bool Contains(object value)
        { 
            return ((IList)this.uniqueNamespaces).Contains(value);
        } 
 
        public int IndexOf(object value)
        { 
            return ((IList)this.uniqueNamespaces).IndexOf(value);
        }

        public void Insert(int index, object value) 
        {
            NamespaceData ns = value as NamespaceData; 
            if (ns == null) 
            {
                throw FxTrace.Exception.AsError(new ArgumentException(SR.NamespaceListArgumentMustBeNamespaceData, "value")); 
            }

            if (Lookup(ns.Namespace) == -1)
            { 
                this.uniqueNamespaces.Insert(index, ns);
                this.importReferences.UnionWith(GetVisualBasicImportReferences(ns.Namespace)); 
            } 
            else
            { 
                throw FxTrace.Exception.AsError(new InvalidOperationException());
            }
        }
 
        public bool IsFixedSize
        { 
            get { return false; } 
        }
 
        public bool IsReadOnly
        {
            get { return false; }
        } 

        public void Remove(object value) 
        { 
            NamespaceData ns = value as NamespaceData;
            if (ns == null) 
            {
                throw FxTrace.Exception.AsError(new ArgumentException(SR.NamespaceListArgumentMustBeNamespaceData, "value"));
            }
 
            int index = this.Lookup(ns.Namespace);
            if (index != -1) 
            { 
                RemoveAt(index);
            } 
        }

        public void RemoveAt(int index)
        { 
            NamespaceData ns = this.uniqueNamespaces[index];
 
            RemoveNamespaceFromSet(ns.Namespace); 

            this.uniqueNamespaces.RemoveAt(index); 
        }

        public object this[int index]
        { 
            get
            { 
                return this.uniqueNamespaces[index]; 
            }
            set 
            {
                NamespaceData ns = value as NamespaceData;
                if (ns == null)
                { 
                    throw FxTrace.Exception.AsError(new ArgumentException(SR.NamespaceListArgumentMustBeNamespaceData, "value"));
                } 
 
                if (Lookup(ns.Namespace) == -1)
                { 
                    RemoveNamespaceFromSet(this.uniqueNamespaces[index].Namespace);
                    this.uniqueNamespaces[index] = ns;
                    this.importReferences.UnionWith(GetVisualBasicImportReferences(ns.Namespace));
                } 
                else
                { 
                    throw FxTrace.Exception.AsError(new InvalidOperationException(SR.NamespaceListNoDuplicate)); 
                }
            } 
        }

        public void CopyTo(Array array, int index)
        { 
            ((IList)this.uniqueNamespaces).CopyTo(array, index);
        } 
 
        public int Count
        { 
            get { return this.uniqueNamespaces.Count; }
        }

        public bool IsSynchronized 
        {
            get { return false; } 
        } 

        public object SyncRoot 
        {
            get { return null; }
        }
 
        public IEnumerator GetEnumerator()
        { 
            return this.uniqueNamespaces.GetEnumerator(); 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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