New.cs source code in C# .NET

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

namespace System.Activities.Expressions 
{
    using System.Activities; 
    using System.Collections.ObjectModel; 
    using System.Diagnostics.CodeAnalysis;
    using System.Reflection; 
    using System.Runtime;
    using System.Runtime.Collections;
    using System.Windows.Markup;
 
    [SuppressMessage(FxCop.Category.Naming, FxCop.Rule.IdentifiersShouldNotMatchKeywords,
        Justification = "Optimizing for XAML naming. VB imperative users will [] qualify (e.g. New [New])")] 
    [SuppressMessage(FxCop.Category.Naming, FxCop.Rule.IdentifiersShouldNotHaveIncorrectSuffix, 
        Justification = "Optimizing for XAML naming.")]
    [ContentProperty("Arguments")] 
    public sealed class New : CodeActivity
    {
        Collection arguments;
        ConstructorInfo constructorInfo; 

        public New() 
            : base() 
        {
        } 

        [SuppressMessage(FxCop.Category.Naming, FxCop.Rule.PropertyNamesShouldNotMatchGetMethods,
            Justification = "Optimizing for XAML naming.")]
        public Collection Arguments 
        {
            get 
            { 
                if (this.arguments == null)
                { 
                    this.arguments = new ValidatingCollection
                    {
                        // disallow null values
                        OnAddValidationCallback = item => 
                        {
                            if (item == null) 
                            { 
                                throw FxTrace.Exception.ArgumentNull("item");
                            } 
                        }
                    };
                }
                return this.arguments; 
            }
        } 
 
        protected override void CacheMetadata(CodeActivityMetadata metadata)
        { 
            bool foundError = false;

            // Loop through each argument, validate it, and if validation
            // passed expose it to the metadata 
            Type[] types = new Type[this.Arguments.Count];
            for (int i = 0; i < this.Arguments.Count; i++) 
            { 
                Argument argument = this.Arguments[i];
                if (argument == null || argument.Expression == null) 
                {
                    metadata.AddValidationError(SR.ArgumentRequired("Arguments", typeof(New)));
                    foundError = true;
                } 
                else
                { 
                    RuntimeArgument runtimeArgument = new RuntimeArgument("Argument" + i, this.arguments[i].ArgumentType, this.arguments[i].Direction, true); 
                    metadata.Bind(this.arguments[i], runtimeArgument);
                    metadata.AddArgument(runtimeArgument); 
                    types[i] = this.Arguments[i].Direction == ArgumentDirection.In ? this.Arguments[i].ArgumentType : this.Arguments[i].ArgumentType.MakeByRefType();
                }
            }
 
            // If we didn't find any errors in the arguments then
            // we can look for an appropriate constructor. 
            if (!foundError) 
            {
                this.constructorInfo = typeof(TResult).GetConstructor(types); 
                if (this.constructorInfo == null && (!typeof(TResult).IsValueType || types.Length > 0))
                {
                    metadata.AddValidationError(SR.ConstructorInfoNotFound(typeof(TResult).Name));
                } 
            }
        } 
 
        protected override TResult Execute(CodeActivityContext context)
        { 
            object[] objects = new object[this.Arguments.Count];
            for (int i = 0; i < this.Arguments.Count; i++)
            {
                objects[i] = this.Arguments[i].Get(context); 
            }
            TResult result; 
            if (this.constructorInfo != null) 
            {
                result = (TResult)this.constructorInfo.Invoke(objects); 
            }
            else
            {
                Fx.Assert(typeof(TResult).IsValueType, "The type of '" + typeof(TResult).Name + "' must be a value type."); 
                Fx.Assert(this.Arguments.Count == 0, "The number of argument must be zero.");
                result = (TResult)Activator.CreateInstance(typeof(TResult)); 
            } 
            for (int i = 0; i < this.Arguments.Count; i++)
            { 
                Argument argument = this.Arguments[i];
                if (argument.Direction == ArgumentDirection.InOut || argument.Direction == ArgumentDirection.Out)
                {
                    argument.Set(context, objects[i]); 
                }
            } 
            return result; 
        }
 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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New.cs source code in C# .NET

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