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copied!<p>Yes, you can use Linq queries with Workflow. In WF what you are referring to as a rule is an expression that is evaluated at runtime. Your query is selecting a subset of the orderliness based on a criteria. </p> <p>For example, if I have a collection of names and I want to see only names that begin with 'R'. I could write the following code.</p> <pre><code>private static void ShowQueryWithCode(IEnumerable<string> names) { Console.WriteLine("LINQ Query in Code - show names that start with 'R'"); // Assuming there are no null entries in the names collection var query = from name in names where name.StartsWith("R") select name; // This is the same thing as // var query = names.Where(name => name.StartsWith("R")); foreach (var name in query) { Console.WriteLine(name); } Console.WriteLine(); } </code></pre> <p>To do the same with Workflow</p> <p><strong>Step 1: Create a Workflow with an In Argument of type IEnumerable</strong></p> <p>Here you can see that I've added the in argument <img src="https://i.stack.imgur.com/K9RNy.png" alt="in argument"></p> <p><strong>Step 2: Add a Variable for the query of type IEnumerable</strong></p> <p>Before you can add a variable you need to include an activity which has variables. In this workflow I've added a sequence.</p> <p><img src="https://i.stack.imgur.com/xTpKD.png" alt="variable"></p> <p><strong>Step 3: Assign the query the LINQ expression you want to use</strong> You can use a method chain or query syntax.</p> <p><img src="https://i.stack.imgur.com/GIn9c.png" alt="expression"></p> <p><strong>Step 4: Iterate over the collection</strong></p> <p>In the completed workflow I used a ForEach activity to iterate the list of names and write them to the console.</p> <p><img src="https://i.stack.imgur.com/UlGAw.jpg" alt="Workflow1"></p> <p>This example uses C# in .NET 4.5 but the same technique can be used with Visual Basic.</p> <p>You can download the sample code <a href="http://code.msdn.microsoft.com/Using-Linq-Queries-in-5b17f6be" rel="nofollow noreferrer">here</a></p>

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