144 lines
5.1 KiB
C#
144 lines
5.1 KiB
C#
//-----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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namespace System.Activities.Expressions
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{
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using System.ComponentModel;
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using System.Reflection;
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using System.Runtime;
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using System.Runtime.Serialization;
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public sealed class FieldReference<TOperand, TResult> : CodeActivity<Location<TResult>>
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{
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FieldInfo fieldInfo;
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public FieldReference()
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: base()
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{
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}
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[DefaultValue(null)]
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public string FieldName
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{
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get;
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set;
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}
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[DefaultValue(null)]
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public InArgument<TOperand> Operand
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{
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get;
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set;
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}
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protected override void CacheMetadata(CodeActivityMetadata metadata)
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{
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bool isRequired = false;
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if (typeof(TOperand).IsEnum)
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{
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metadata.AddValidationError(SR.TargetTypeCannotBeEnum(this.GetType().Name, this.DisplayName));
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}
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else if (typeof(TOperand).IsValueType)
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{
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metadata.AddValidationError(SR.TargetTypeIsValueType(this.GetType().Name, this.DisplayName));
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}
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if (string.IsNullOrEmpty(this.FieldName))
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{
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metadata.AddValidationError(SR.ActivityPropertyMustBeSet("FieldName", this.DisplayName));
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}
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else
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{
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Type operandType = typeof(TOperand);
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this.fieldInfo = operandType.GetField(this.FieldName);
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if (this.fieldInfo == null)
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{
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metadata.AddValidationError(SR.MemberNotFound(this.FieldName, typeof(TOperand).Name));
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}
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else
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{
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if (fieldInfo.IsInitOnly)
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{
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metadata.AddValidationError(SR.MemberIsReadOnly(this.FieldName, typeof(TOperand).Name));
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}
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isRequired = !this.fieldInfo.IsStatic;
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}
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}
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MemberExpressionHelper.AddOperandArgument(metadata, this.Operand, isRequired);
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}
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protected override Location<TResult> Execute(CodeActivityContext context)
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{
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Fx.Assert(this.fieldInfo != null, "fieldInfo must not be null.");
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return new FieldLocation(this.fieldInfo, this.Operand.Get(context));
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}
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[DataContract]
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internal class FieldLocation : Location<TResult>
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{
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FieldInfo fieldInfo;
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object owner;
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public FieldLocation(FieldInfo fieldInfo, object owner)
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: base()
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{
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this.fieldInfo = fieldInfo;
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this.owner = owner;
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}
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public override TResult Value
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{
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get
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{
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//if (!this.fieldInfo.IsStatic && this.owner == null)
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//{
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// // The field is non-static, and obj is a null reference
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// if (this.fieldInfo.DeclaringType != null)
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// {
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// throw FxTrace.Exception.AsError(new ValidationException(SR.NullReferencedMemberAccess(this.fieldInfo.DeclaringType.Name, this.fieldInfo.Name)));
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// }
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// else
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// {
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// throw FxTrace.Exception.AsError(new ValidationException(SR.NullReferencedMemberAccess(typeof(FieldInfo), "DeclaringType")));
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// }
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//}
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return (TResult)this.fieldInfo.GetValue(this.owner);
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}
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set
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{
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//if (!this.fieldInfo.IsStatic && this.owner == null)
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//{
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// if (this.fieldInfo.DeclaringType != null)
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// {
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// // The field is non-static, and obj is a null reference
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// throw FxTrace.Exception.AsError(new ValidationException(SR.NullReferencedMemberAccess(this.fieldInfo.DeclaringType.Name, this.fieldInfo.Name)));
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// }
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// else
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// {
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// throw FxTrace.Exception.AsError(new ValidationException(SR.NullReferencedMemberAccess(typeof(FieldInfo), "DeclaringType")));
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// }
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//}
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this.fieldInfo.SetValue(this.owner, value);
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}
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}
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[DataMember(Name = "fieldInfo")]
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internal FieldInfo SerializedFieldInfo
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{
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get { return this.fieldInfo; }
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set { this.fieldInfo = value; }
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}
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[DataMember(EmitDefaultValue = false, Name = "owner")]
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internal object SerializedOwner
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{
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get { return this.owner; }
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set { this.owner = value; }
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}
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}
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}
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}
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