83 lines
2.2 KiB
C#
83 lines
2.2 KiB
C#
//-----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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namespace Microsoft.CSharp.Activities
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{
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using System;
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using System.Activities;
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using System.Activities.Expressions;
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using System.Activities.XamlIntegration;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.Linq.Expressions;
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using System.Windows.Markup;
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[DebuggerStepThrough]
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[ContentProperty("ExpressionText")]
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public class CSharpReference<TResult> : CodeActivity<Location<TResult>>, ITextExpression
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{
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CompiledExpressionInvoker invoker;
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public CSharpReference()
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{
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this.UseOldFastPath = true;
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}
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public CSharpReference(string expressionText) :
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this()
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{
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this.ExpressionText = expressionText;
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}
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public string ExpressionText
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{
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get;
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set;
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}
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
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public string Language
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{
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get
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{
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return "C#";
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}
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}
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public bool RequiresCompilation
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{
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get
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{
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return true;
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}
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}
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protected override void CacheMetadata(CodeActivityMetadata metadata)
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{
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this.invoker = new CompiledExpressionInvoker(this, true, metadata);
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}
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protected override Location<TResult> Execute(CodeActivityContext context)
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{
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Location<TResult> value = (Location<TResult>)this.invoker.InvokeExpression(context);
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return value;
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}
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public Expression GetExpressionTree()
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{
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if (this.IsMetadataCached)
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{
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return this.invoker.GetExpressionTree();
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}
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else
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{
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throw FxTrace.Exception.AsError(new InvalidOperationException(SR.ActivityIsUncached));
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}
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}
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}
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}
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