Check if dynamic property exists during add operation

src/Abp/DynamicEntityProperties/DynamicPropertyManager.cs

@@ -78,6 +78,12 @@ protected virtual void CheckDynamicProperty(DynamicProperty dynamicProperty)
             {
                 throw new ApplicationException($"Input type is invalid, if you want to use \"{dynamicProperty.InputType}\" input type, define it in DynamicEntityPropertyDefinitionProvider.");
             }
+
+            var existingProperty = _dynamicPropertyStore.Get(dynamicProperty.PropertyName);
+            if (existingProperty != null)
+            {
+                throw new ArgumentException($"There is already a dynamic property with name: '{dynamicProperty.PropertyName}'");
+            }
         }
 
         public virtual DynamicProperty Add(DynamicProperty dynamicProperty)

test/Abp.Zero.SampleApp.Tests/DynamicEntityProperties/DynamicPropertyManager_Tests.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Linq;
 using System.Threading.Tasks;
+using Abp.Dependency;
+using Abp.Domain.Uow;
 using Abp.DynamicEntityProperties;
 using Abp.Runtime.Caching;
 using NSubstitute;
@@ -172,6 +174,31 @@ public void Should_Not_Add_If_Property_Name_Is_Null_Or_Empty()
                 Should.Throw<ArgumentNullException>(() => dynamicPropertyManager.Add(testDynamicProperty2));
             exception2.Message.ShouldContain(nameof(testDynamicProperty.PropertyName));
         }
+
+        [Fact]
+        public void Should_Not_Add_Duplicate_Property_Name()
+        {
+            var propertyName = "Age";
+            var testDynamicProperty1 = new DynamicProperty
+            {
+                PropertyName = propertyName,
+                InputType = Resolve<IDynamicEntityPropertyDefinitionManager>().GetAllAllowedInputTypeNames().First(),
+                TenantId = AbpSession.TenantId
+            };
+
+            var testDynamicProperty2 = new DynamicProperty
+            {
+                PropertyName = propertyName,
+                InputType = Resolve<IDynamicEntityPropertyDefinitionManager>().GetAllAllowedInputTypeNames().First(),
+                TenantId = AbpSession.TenantId
+            };
+
+            var dynamicPropertyManager = Resolve<IDynamicPropertyManager>();
+
+            dynamicPropertyManager.Add(testDynamicProperty1);
+            var exception = Should.Throw<ArgumentException>(() => dynamicPropertyManager.Add(testDynamicProperty2));
+            exception.Message.ShouldBe($"There is already a dynamic property with name: '{propertyName}'");
+        }
 
         [Fact]
         public void Should_Update_And_Change_Cache()