OrElse.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Expressions / OrElse.cs / 1305376 / OrElse.cs
                        

                        
                            //---------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------

namespace System.Activities.Expressions 
{
    using System.Activities; 
    using System.Activities.Statements; 
    using System.ComponentModel;
    using System.Diagnostics.CodeAnalysis; 
    using System.Runtime;

    [SuppressMessage(FxCop.Category.Naming, FxCop.Rule.IdentifiersShouldNotMatchKeywords, Justification = "Optimizing for XAML naming. VB imperative users will [] qualify (e.g. New [OrElse])")]
    public sealed class OrElse : Activity 
    {
        public OrElse() 
            :base() 
        {
            this.Implementation = 
                () =>
                {
                    if (this.Left != null && this.Right != null)
                    { 
                        return new If
                        { 
                            Condition = this.Left, 
                            Then = new Assign
                            { 
                                To = new OutArgument(context => this.Result.Get(context)),
                                Value = true,
                            },
                            Else = new Assign 
                            {
                                To = new OutArgument(context => this.Result.Get(context)), 
                                Value = new InArgument(this.Right) 
                            }
                        }; 
                    }
                    else
                    {
                        return null; 
                    }
                }; 
        } 

        [DefaultValue(null)] 
        public Activity Left
        {
            get;
            set; 
        }
 
        [DefaultValue(null)] 
        public Activity Right
        { 
            get;
            set;
        }
 
        protected override void CacheMetadata(ActivityMetadata metadata)
        { 
            metadata.AddImportedChild(this.Left); 
            metadata.AddImportedChild(this.Right);
 
            if (this.Left == null)
            {
                metadata.AddValidationError(SR.BinaryExpressionActivityRequiresArgument("Left", "OrElse", this.DisplayName));
            } 

            if (this.Right == null) 
            { 
                metadata.AddValidationError(SR.BinaryExpressionActivityRequiresArgument("Right", "OrElse", this.DisplayName));
            } 
        }
    }
}

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

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