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DataPRO/IService/Classes/Channels/AnalogInputDASChannelComparer.cs

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+using System;
+using System.Collections.Generic;
+
+namespace DTS.DASLib.Service
+{
+    // Custom comparer for the IDASCommunication class.
+    public class AnalogInputDASChannelComparer : IEqualityComparer<AnalogInputDASChannel>
+    {
+        // GainInfo are equal if their Gain is equal.
+        public bool Equals(AnalogInputDASChannel x, AnalogInputDASChannel y)
+        {
+            // Check whether the compared objects reference the same data.
+            if (ReferenceEquals(x, y))
+                return true;
+
+            // Check whether any of the compared objects is null.
+            if (x is null || y is null)
+                return false;
+
+            if (x.OwningModule == null || y.OwningModule == null)
+                return false;
+
+            if (x.OwningModule.OwningDAS == null || y.OwningModule.OwningDAS == null)
+                return false;
+
+            if (string.IsNullOrEmpty(x.OwningModule.OwningDAS.SerialNumber) ||
+                string.IsNullOrEmpty(y.OwningModule.OwningDAS.SerialNumber))
+                return false;
+
+            // Check whether they are equal.
+            return x.ModuleChannelNumber == y.ModuleChannelNumber &&
+                   x.OwningModule.ModuleArrayIndex == y.OwningModule.ModuleArrayIndex &&
+                   x.OwningModule.OwningDAS.SerialNumber == y.OwningModule.OwningDAS.SerialNumber &&
+                   x.AbsoluteDisplayOrder == y.AbsoluteDisplayOrder &&
+                   x.UnitConverision == y.UnitConverision;
+        }
+
+        // If Equals() returns true for a pair of objects,
+        // GetHashCode must return the same value for these objects.
+
+        public int GetHashCode(AnalogInputDASChannel analog)
+        {
+            // Check whether the object is null.
+
+            if (string.IsNullOrEmpty(analog.OwningModule?.OwningDAS?.SerialNumber))
+                return 0;
+
+            // Get the hash code for the fields
+            return analog.ModuleChannelNumber.GetHashCode() ^
+                   analog.OwningModule.ModuleArrayIndex.GetHashCode() ^
+                   analog.OwningModule.OwningDAS.SerialNumber.GetHashCode() ^
+                   analog.AbsoluteDisplayOrder.GetHashCode() ^
+                   analog.UnitConverision.GetHashCode();
+        }
+    }
+}