PropertyValue.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 / PropertyValue.cs / 1305376 / PropertyValue.cs

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

namespace System.Activities.Expressions 
{
    using System.Activities; 
    using System.Activities.Validation; 
    using System.ComponentModel;
    using System.Reflection; 
    using System.Runtime;

    public sealed class PropertyValue : CodeActivity
    { 
        Func operationFunction;
 
        public InArgument Operand 
        {
            get; 
            set;
        }

        [DefaultValue(null)] 
        public string PropertyName
        { 
            get; 
            set;
        } 

        protected override void CacheMetadata(CodeActivityMetadata metadata)
        {
            bool isRequired = false; 
            if (typeof(TOperand).IsEnum)
            { 
                metadata.AddValidationError(SR.TargetTypeCannotBeEnum(this.GetType().Name, this.DisplayName)); 
            }
 
            if (string.IsNullOrEmpty(this.PropertyName))
            {
                metadata.AddValidationError(SR.ActivityPropertyMustBeSet("PropertyName", this.DisplayName));
            } 
            else
            { 
                PropertyInfo propertyInfo = null; 
                Type operandType = typeof(TOperand);
                propertyInfo = operandType.GetProperty(this.PropertyName); 

                if (propertyInfo == null)
                {
                    metadata.AddValidationError(SR.MemberNotFound(this.PropertyName, typeof(TOperand).Name)); 
                }
                else 
                { 
                    Fx.Assert(propertyInfo.GetAccessors().Length > 0, "Property should have at least 1 accessor.");
 
                    isRequired = !propertyInfo.GetAccessors()[0].IsStatic;

                    ValidationError validationError;
                    if (!MemberExpressionHelper.TryGenerateLinqDelegate(this.PropertyName, false, propertyInfo.GetAccessors()[0].IsStatic, out this.operationFunction, out validationError)) 
                    {
                        metadata.AddValidationError(validationError); 
                    } 

                    MethodInfo getMethod = propertyInfo.GetGetMethod(); 
                    MethodInfo setMethod = propertyInfo.GetSetMethod();

                    if ((getMethod != null && !getMethod.IsStatic) || (setMethod != null && !setMethod.IsStatic))
                    { 
                        isRequired = true;
                    } 
                } 
            }
            MemberExpressionHelper.AddOperandArgument(metadata, this.Operand, isRequired); 
        }

        protected override TResult Execute(CodeActivityContext context)
        { 
            TOperand operandValue = this.Operand.Get(context);
            TResult result = this.operationFunction(operandValue); 
            return result; 
        }
    } 
}

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

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK