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POWF 4.5. Using C# expressions with external class references
 

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  1. POWF 4.5. Using C# expressions with external class references
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    <p>I am trying to compile Dynamic activity using the new WF 4.5 features - C# expression. It works until I add an external class in the expression.</p> <p>If the expression contains basic objects it's complied. If I add a reference to an external class it's generates an error "The type or namespace name 'xxxxx' could not be found (are you missing a using directive or an assembly reference?)"</p> <p>So, the question is how can I reference external classes for C# expressions?</p> <p>P.S. It works fine with VisualBasic expression type</p> <p>Thanks</p> <pre><code>//Compiled without errors var errorCodeWorkflow = new DynamicActivity { Name = "DynamicActivity", Implementation = () =&gt; new WriteLine { Text = new CSharpValue&lt;String&gt; { ExpressionText = "new Random().Next(1, 101).ToString()" } } }; CompileExpressions(errorCodeWorkflow); WorkflowInvoker.Invoke(errorCodeWorkflow); //Error using System; using System.Activities; using System.Activities.Expressions; using System.Activities.Statements; using System.Activities.XamlIntegration; using System.Collections.Generic; using System.Linq; using Microsoft.CSharp.Activities; namespace CSharpExpression { class Program { static void Main() { var errorCodeWorkflow = new DynamicActivity { Name = "MyScenario.MyDynamicActivity3", Properties = { new DynamicActivityProperty { Name = "Address", Type = typeof(InArgument&lt;MailAddress&gt;), }, }, Implementation = () =&gt; new WriteLine { Text = new CSharpValue&lt;String&gt; { ExpressionText = "\"MyDynamicActivity \" + Address.DisplayName" } } }; CompileExpressions(errorCodeWorkflow); WorkflowInvoker.Invoke(errorCodeWorkflow, new Dictionary&lt;String, Object&gt; { { "Address", new MailAddress { DisplayName = "TestDisplayName" } } }); } static void CompileExpressions(DynamicActivity dynamicActivity) { var activityName = dynamicActivity.Name; var activityType = activityName.Split('.').Last() + "_CompiledExpressionRoot"; var activityNamespace = string.Join(".", activityName.Split('.').Reverse().Skip(1).Reverse()); var settings = new TextExpressionCompilerSettings { Activity = dynamicActivity, Language = "C#", ActivityName = activityType, ActivityNamespace = activityNamespace, RootNamespace = "CSharpExpression", GenerateAsPartialClass = false, AlwaysGenerateSource = true, ForImplementation = true }; var results = new TextExpressionCompiler(settings).Compile(); if (results.HasErrors) { throw new Exception("Compilation failed."); } var compiledExpressionRoot = Activator.CreateInstance(results.ResultType, new object[] { dynamicActivity }) as ICompiledExpressionRoot; CompiledExpressionInvoker.SetCompiledExpressionRootForImplementation(dynamicActivity, compiledExpressionRoot); } } public class MailAddress { public String Address { get; set; } public String DisplayName { get; set; } } } </code></pre>
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