Merge pull request #7 from Broda/master

Null warning cleanup and String/Xml Extension creation

Author: rwp0001

CnE2PLC.Helpers/StringHelper.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace CnE2PLC.Helpers
+{
+    public static class StringHelper
+    {
+        public static int ContainsAsBit(this string? str, string searchStr)
+        {
+            return (str ?? String.Empty).Contains(searchStr) ? 1 : 0;
+        }
+
+        public static T? ParseEnum<T>(this string str) where T : struct, Enum
+        {
+            return Enum.TryParse<T>(str, out var t) ? t : (T?)null;
+        }
+    }
+}

CnE2PLC.Helpers/XMLHelper.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Xml;
+using System.Xml.Linq;
+
+namespace CnE2PLC.Helpers;
+
+public static class XMLHelper
+{
+    public static XmlNode CreateGenericXmlNode()
+    {
+        XmlDocument document = new XmlDocument();
+        return document.CreateNode(XmlNodeType.Element, "Generic", "");
+    }
+
+    public static string GetNamedAttributeItemValue(this XmlNode node, string name)
+    {
+        return node.Attributes?.GetNamedItem(name)?.Value ?? String.Empty;
+    }
+
+    public static string GetNamedAttributeItemInnerText(this XmlNode node, string name)
+    {
+        return node.Attributes?.GetNamedItem(name)?.InnerText ?? String.Empty;
+    }
+
+    public static int? GetNamedAttributeItemInnerTextAsInt(this XmlNode node, string name)
+    {
+        return int.TryParse(node.GetNamedAttributeItemInnerText(name), out var value) ? value : null;
+    }
+
+    public static DateTime? GetNameAttributeItemInnerTextAsDateTime(this XmlNode node, string name)
+    {
+        string input = node.GetNamedAttributeItemInnerText(name);
+        var sp = input.Split(' ');
+        input = sp[1] + " " + sp[2] + ", " + sp[4] + " " + sp[3];
+        return DateTime.TryParse(input, out DateTime dt) ? dt : null;
+        // Sat May 11 10:43:06 2024
+        
+    }
+
+    public static XmlNode SelectSingleNode(this XmlNode node, string name, XmlNode defaultIfNull)
+    {
+        return node.SelectSingleNode(name) ?? defaultIfNull;
+    }
+
+    public static string GetChildNodeInnerText(this XmlNode node, string name, bool useLast)
+    {
+        XmlNode? child = useLast ? node.ChildNodes.Cast<XmlNode>().LastOrDefault(n => n?.Name == name, null) : node.ChildNodes.Cast<XmlNode>().FirstOrDefault(n => n?.Name == name, null);
+        return child == null ? String.Empty : child.InnerText;
+    }
+
+    public static bool AttributeExists(this XmlNode node, string name)
+    {
+        return node.Attributes?.GetNamedItem(name) != null;
+    }
+
+    public static bool AttributeExists(this XmlNode node, string name, out XmlNode attribute)
+    {
+        XmlNode? temp = node.Attributes?.GetNamedItem(name);
+        if (temp != null)
+        {
+            attribute = temp;
+            return true;
+        }
+        attribute = CreateGenericXmlNode();
+        return false;
+        
+    }
+}

CnE2PLC.PLC/CnE2PLC.PLC.csproj

@@ -8,7 +8,10 @@
 
   <ItemGroup>
     <PackageReference Include="libplctag" Version="1.5.2" />
-    <PackageReference Include="System.Xml.XDocument" Version="4.3.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CnE2PLC.Helpers\CnE2PLC.Helpers.csproj" />
   </ItemGroup>
 
 </Project>