Zero length string now handled for the Depth property

XML_Engine/Query/Depth.cs

@@ -0,0 +1,66 @@
+/*
+ * This file is part of the Buildings and Habitats object Model (BHoM)
+ * Copyright (c) 2015 - 2022, the respective contributors. All rights reserved.
+ *
+ * Each contributor holds copyright over their respective contributions.
+ * The project versioning (Git) records all such contribution source information.
+ *                                           
+ *                                                                              
+ * The BHoM is free software: you can redistribute it and/or modify         
+ * it under the terms of the GNU Lesser General Public License as published by  
+ * the Free Software Foundation, either version 3.0 of the License, or          
+ * (at your option) any later version.                                          
+ *                                                                              
+ * The BHoM is distributed in the hope that it will be useful,              
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of               
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                 
+ * GNU Lesser General Public License for more details.                          
+ *                                                                            
+ * You should have received a copy of the GNU Lesser General Public License     
+ * along with this code. If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.      
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using BH.oM.Environment.Elements;
+using BH.Engine.Environment;
+
+using System.ComponentModel;
+using BH.oM.Base.Attributes;
+using BH.oM.XML.Bluebeam;
+using System.Text;
+using System.Threading.Tasks;
+
+using BH.oM.Adapters.XML;
+using BH.oM.Adapters.XML.Enums;
+
+namespace BH.Engine.Adapters.XML
+{
+    public static partial class Query
+    {
+        /***************************************************/
+        /**** Public Methods                            ****/
+        /***************************************************/
+
+        [Description("Returns the 'depth' property of a markup object as a double. If the value cannot be converted to a double (if the value is null or blank for example) then an error will be provided and -1 will be returned.")]
+        [Input("markup", "A markup object which contains the 'depth' property.")]
+        [Output("depth", "The depth value as a double, or -1 if the value could not be converted to a double.")]
+        public static double Depth(this Markup markup)
+        {
+            if (markup == null)
+                return -1;
+
+            try
+            {
+                return System.Convert.ToDouble(markup.XMLDepth);
+            }
+            catch (Exception e)
+            {
+                BH.Engine.Base.Compute.RecordError($"Could not convert XMLDepth value {markup.XMLDepth} to numerical depth.");
+                return -1;
+            }
+        }
+    }
+}
+

XML_Engine/XML_Engine.csproj

@@ -46,6 +46,11 @@
       <Private>False</Private>
       <SpecificVersion>False</SpecificVersion>
     </Reference>
+    <Reference Include="BHoM_Engine">
+      <HintPath>C:\ProgramData\BHoM\Assemblies\BHoM_Engine.dll</HintPath>
+      <Private>False</Private>
+      <SpecificVersion>False</SpecificVersion>
+    </Reference>
     <Reference Include="Dimensional_oM">
       <HintPath>C:\ProgramData\BHoM\Assemblies\Dimensional_oM.dll</HintPath>
       <Private>False</Private>
@@ -107,6 +112,7 @@
     <Compile Include="Query\CleanName.cs" />
     <Compile Include="Query\ExposedToSun.cs" />
     <Compile Include="Query\ExternalElements.cs" />
+    <Compile Include="Query\Depth.cs" />
     <Compile Include="Query\IsExternal.cs" />
   </ItemGroup>
   <ItemGroup>

XML_oM/Bluebeam/Markup.cs

@@ -65,8 +65,8 @@ public class Markup : BluebeamObject
         public virtual string Label { get; set; }
 
         [XmlElement("Depth")]
-        public virtual double Depth { get; set; }
-
+        public virtual string XMLDepth { get; set; }
+        
         [XmlElement("Layer")]
         public virtual string Layer { get; set; }
     }