Add check logics for beam shear

StructureHelperCommon/Models/Forces/BeamShearActions/CheckBeamShearActionLogic.cs

@@ -0,0 +1,52 @@
+using StructureHelperCommon.Infrastructures.Interfaces;
+
+namespace StructureHelperCommon.Models.Forces.BeamShearActions
+{
+    public class CheckBeamShearActionLogic : ICheckEntityLogic<IBeamShearAction>
+    {
+        private string checkResult;
+        private bool result;
+
+        public string CheckResult => checkResult;
+        public IBeamShearAction Entity { get; set; }
+
+        public IShiftTraceLogger? TraceLogger { get; set; }
+        public CheckBeamShearActionLogic(IBeamShearAction entity, IShiftTraceLogger? traceLogger)
+        {
+            Entity = entity;
+            TraceLogger = traceLogger;
+        }
+
+        public bool Check()
+        {
+            checkResult = string.Empty;
+            result = true;
+            if (Entity is null)
+            {
+                result = false;
+                string errorString = "\nInclined section is not assigned";
+                TraceMessage(errorString);
+            }
+            else
+            {
+                if (Entity.ExternalForce is null)
+                {
+                    result = false;
+                    TraceMessage($"\nExternal force is null");
+                }
+                if (Entity.SupportAction is null)
+                {
+                    result = false;
+                    TraceMessage($"\nSupport action is null");
+                }
+            }
+            return result;
+        }
+
+        private void TraceMessage(string errorString)
+        {
+            checkResult += errorString;
+            TraceLogger?.AddMessage(errorString, TraceLogStatuses.Error);
+        }
+    }
+}