Created an example project on how to use PowerFx in Dynamics 365 Finance and Operations

Samples/Dynamics365FODemo/.gitignore

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+**/.vs
+**/obj
+**/bin/*
+**/Resources
+**/XppMetadata
+**/Reports
+**/references
+
+BuildModelResult.log
+BuildModelResult.xml
+BuildModelResult.err.xml
+BuildProjectResult.log
+BuildProjectResult.xml
+BuildProjectResult.err.xml
+CompileLabels.xml

Samples/Dynamics365FODemo/Dynamics365FODemo.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.34031.81
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PowerFxDemoLibrary", "PowerFxDemoLibrary\PowerFxDemoLibrary.csproj", "{7BACE988-ECCE-4A1A-AF7F-2A400BBF9601}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{7DEDF1AD-DD13-4127-8EEC-12B9E30A7B9D}"
+	ProjectSection(SolutionItems) = preProject
+		.gitignore = .gitignore
+	EndProjectSection
+EndProject
+Project("{FC65038C-1B2F-41E1-A629-BED71D161FFF}") = "PowerFxDemo D365FO (VAR) [PowerFx D365FO Demo]", "PowerFxDemo D365FO\PowerFxDemo D365FO.rnrproj", "{3877D19E-04BE-4209-BFB9-979C95B574BC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{7BACE988-ECCE-4A1A-AF7F-2A400BBF9601}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7BACE988-ECCE-4A1A-AF7F-2A400BBF9601}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7BACE988-ECCE-4A1A-AF7F-2A400BBF9601}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7BACE988-ECCE-4A1A-AF7F-2A400BBF9601}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3877D19E-04BE-4209-BFB9-979C95B574BC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3877D19E-04BE-4209-BFB9-979C95B574BC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3877D19E-04BE-4209-BFB9-979C95B574BC}.Release|Any CPU.ActiveCfg = Debug|Any CPU
+		{3877D19E-04BE-4209-BFB9-979C95B574BC}.Release|Any CPU.Build.0 = Debug|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {914DB8F6-2C93-420B-9F34-90AF1B21D442}
+	EndGlobalSection
+EndGlobal

Samples/Dynamics365FODemo/Metadata/PowerFxDemo/Descriptor/PowerFxDemo.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<AxModelInfo xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
+	<AppliedUpdates xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" />
+	<Customization>Allow</Customization>
+	<Description>PowerFx D365FO Demo</Description>
+	<DisplayName>PowerFx D365FO Demo</DisplayName>
+	<Id>896000516</Id>
+	<InternalsVisibleTo xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays" />
+	<Layer>10</Layer>
+	<Locked>false</Locked>
+	<ModelModule>PowerFxDemo</ModelModule>
+	<ModelReferences xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays"
+		i:nil="true" />
+	<ModuleReferences xmlns:d2p1="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
+		<d2p1:string>ApplicationFoundation</d2p1:string>
+		<d2p1:string>ApplicationPlatform</d2p1:string>
+		<d2p1:string>ApplicationSuite</d2p1:string>
+		<d2p1:string>ContactPerson</d2p1:string>
+		<d2p1:string>Directory</d2p1:string>
+		<d2p1:string>FiscalBooks</d2p1:string>
+		<d2p1:string>Ledger</d2p1:string>
+		<d2p1:string>Retail</d2p1:string>
+		<d2p1:string>SourceDocumentation</d2p1:string>
+		<d2p1:string>SourceDocumentationTypes</d2p1:string>
+		<d2p1:string>Tax</d2p1:string>
+	</ModuleReferences>
+	<Name>PowerFxDemo</Name>
+	<Publisher>Dominik Downarowicz</Publisher>
+	<SolutionId>00000000-0000-0000-0000-000000000000</SolutionId>
+	<VersionBuild>0</VersionBuild>
+	<VersionMajor>1</VersionMajor>
+	<VersionMinor>0</VersionMinor>
+	<VersionRevision>0</VersionRevision>
+</AxModelInfo>

Samples/Dynamics365FODemo/Metadata/PowerFxDemo/PowerFxDemo/AxClass/PowerFxDeliveryAddressContract.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<AxClass xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
+	<Name>PowerFxDeliveryAddressContract</Name>
+	<SourceCode>
+		<Declaration><![CDATA[
+[DataContractAttribute]
+class PowerFxDeliveryAddressContract
+{
+    str name;
+    str street;
+    str city;
+    str zipCode;
+    str countryCode;
+
+}
+]]></Declaration>
+		<Methods>
+			<Method>
+				<Name>parmName</Name>
+				<Source><![CDATA[
+    [DataMemberAttribute('AddressName')]
+    public str parmName(str _AddressName = name)
+    {
+        name = _AddressName;
+        return name;
+    }
+
+]]></Source>
+			</Method>
+			<Method>
+				<Name>parmStreet</Name>
+				<Source><![CDATA[
+    [DataMemberAttribute('Street')]
+    public str parmStreet(str _Street = street)
+    {
+        street = _Street;
+        return street;
+    }
+
+]]></Source>
+			</Method>
+			<Method>
+				<Name>parmCity</Name>
+				<Source><![CDATA[
+    [DataMemberAttribute('City')]
+    public str parmCity(str _City = city)
+    {
+        city = _City;
+        return city;
+    }
+
+]]></Source>
+			</Method>
+			<Method>
+				<Name>parmZipCode</Name>
+				<Source><![CDATA[
+    [DataMemberAttribute('PostCode')]
+    public str parmZipCode(str _ZipCode = zipCode)
+    {
+        zipCode = _ZipCode;
+        return zipCode;
+    }
+
+]]></Source>
+			</Method>
+			<Method>
+				<Name>parmCountryCode</Name>
+				<Source><![CDATA[
+    [DataMemberAttribute('ISOCountry')]
+    public str parmCountryCode(str _CountryCode = countryCode)
+    {
+        countryCode = _CountryCode;
+        return countryCode;
+    }
+
+]]></Source>
+			</Method>
+			<Method>
+				<Name>getInstance</Name>
+				<Source><![CDATA[
+    public static PowerFxDeliveryAddressContract getInstance(LogisticsPostalAddress _postalAddress)
+    {
+        PowerFxDeliveryAddressContract deliveryAddress = new PowerFxDeliveryAddressContract();
+        deliveryAddress.parmName(_postalAddress.Address);
+        deliveryAddress.parmStreet(_postalAddress.Street);
+        deliveryAddress.parmCity(_postalAddress.City);
+        deliveryAddress.parmZipCode(_postalAddress.ZipCode);
+        deliveryAddress.parmCountryCode(_postalAddress.CountryRegionId);
+        return deliveryAddress;
+    }
+
+]]></Source>
+			</Method>
+		</Methods>
+	</SourceCode>
+</AxClass>

Samples/Dynamics365FODemo/Metadata/PowerFxDemo/PowerFxDemo/AxClass/PowerFxDemoRunnable.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<AxClass xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
+	<Name>PowerFxDemoRunnable</Name>
+	<SourceCode>
+		<Declaration><![CDATA[
+using PowerFxDemoLibrary;
+
+internal final class PowerFxDemoRunnable
+{
+    Dialog dialog;
+    DialogField contextField, formulaField, evaluationField, errorField, salesOrderLookup;
+
+    Evaluation evaluator = new Evaluation();
+}
+]]></Declaration>
+		<Methods>
+			<Method>
+				<Name>main</Name>
+				<Source><![CDATA[
+    public static void main(Args _args)
+    {
+        new PowerFxDemoRunnable().run();
+    }
+
+]]></Source>
+			</Method>
+			<Method>
+				<Name>run</Name>
+				<Source><![CDATA[
+    public void run()
+    {
+        dialog = new Dialog("PowerFX Test");
+        dialog.form().design().dialogSize(DialogSize::Large);
+        dialog.addText("Test the new PowerFx engine");
+
+        salesOrderLookup = dialog.addField(extendedTypeStr(SalesId), "Select sales order context");
+
+        contextField = dialog.addField(extendedTypeStr(WebText), "Context");
+        contextField.multiLine(true);
+        contextField.enabled(false);
+
+        formulaField = dialog.addField(extendedTypeStr(WebText), "Formula");
+        formulaField.multiLine(true);
+        evaluationField = dialog.addField(extendedTypeStr(WebText), "Evaluation Result");
+        evaluationField.multiLine(true);
+        errorField = dialog.addField(extendedTypeStr(WebText), "Error");
+        errorField.multiLine(true);
+        errorField.enabled(false);
+
+        formulaField.registerOverrideMethod(methodStr(FormStringControl, modified), methodStr(PowerFxDemoRunnable, modifiedFormula), this);
+        salesOrderLookup.registerOverrideMethod(methodStr(FormStringControl, modified), methodStr(PowerFxDemoRunnable, modifiedSalesOrderSelection), this);
+
+        dialog.run();
+        if(dialog.closedOk())
+        {
+            Info(evaluationField.value());
+        }
+
+    }
+
+]]></Source>
+			</Method>
+			<Method>
+				<Name>modifiedSalesOrderSelection</Name>
+				<Source><![CDATA[
+    public boolean modifiedSalesOrderSelection(FormStringControl _control)
+    {
+        if(salesOrderLookup.value()){
+            PowerFxSalesHeaderContract contract = PowerFxSalesHeaderContract::getInstance(SalesTable::find(salesOrderLookup.value()));
+            contextField.value(FormJsonSerializer::serializeClass(contract));
+        }
+        return true;
+    }
+
+]]></Source>
+			</Method>
+			<Method>
+				<Name>modifiedFormula</Name>
+				<Source><![CDATA[
+    public boolean modifiedFormula(FormStringControl _control)
+    {
+        Evaluation.Response response = evaluator.EvaluateInput(contextField.value(), formulaField.value());
+
+        if(response.errorThrown == true){
+            //Split string
+            List errorList = new List(Types::String);
+            errorList=strSplit(response.error,'\n');
+            ListIterator iterator = new ListIterator(errorList);
+            while(iterator.more())
+            {
+                if(iterator.value() != "")
+                {
+                    Global::error(iterator.value());
+                }
+                iterator.next();
+            }
+        }
+        evaluationField.value(response.output);
+        errorField.value(response.error);
+        return true;
+    }
+
+]]></Source>
+			</Method>
+		</Methods>
+	</SourceCode>
+</AxClass>