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Item type not specified error when working with DynamicContent API

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TitleItem type not specified error when working with DynamicContent API
URL NameItem-type-not-specified-error-when-working-with-DynamicContent-API
Article Number000179075
EnvironmentProduct: Sitefinity
Version: 13.x
OS: All supported OS versions
Database: All supported Microsoft SQL Server versions
Question/Problem Description
An error "Item type not correctly specified. Use the item's actual type. DynamicContent and null values are not supported." is thrown when working with DynamicContent API.
The error can occur in the following scenarios:
  1. Passing typeof(DynamicContent) as the type parameter on the GetDataItems or GetDataItem methods of the DynamicModuleManager class.
  2. Inheriting the OpenAccessDynamicModuleProvider class and overriding the GetDataItems, GetDataItem, GetItemOrDefault or GetCount methods.
  3. Importing a dynamic module that was exported from a Sitefinity application on version 9.0 or lower. In this case the error manifests in two places:
    1. When going to edit the permissions for this type under Actions -> Permissions
    2. When trying to edit the content of a dynamic content item displayed with a WebForms widget on a page using in-line editing
Steps to ReproduceCall the DynamicContent API with DynamicContent type.

DynamicContent testItem = DynamicModuleManager.GetManager().GetDataItems(typeof(DynamicContent)).FirstOrDefault();
Clarifying Information
Error MessageItem type not correctly specified. Use the item's actual type. DynamicContent and null values are not supported.
Defect Number
Enhancement Number
This is the expected behavior. Using the API with no type or a base type causes severe performance degradation. Refer to following KnowledgeBase articles for example issues:
-  Huge database queries when unlocking a dynamic content item in the backend 
-  Unable to request a page with dynamic content due to a timeout
-  Unable to create dynamic content items due to a timeout

Issue 1:

Pass the correct, fully-qualified type of the specific module. Dynamic module types are constructed in the format Telerik.Sitefinity.DynamicTypes.Model.<DynamicModuleName>.<DynamicTypeName>
Type countryType = TypeResolutionService.ResolveType("Telerik.Sitefinity.DynamicTypes.Model.TravellingAgency.Country");
DynamicContent country = dynamicModuleManager.GetDataItems(countryType).FirstOrDefault();

Issue 2:

Add the following code to the beginning of the overridden methods to prevent the execution of problematic queries:
if (itemType == null || itemType == typeof(DynamicContent))
    throw new ArgumentException("Item type not correctly specified. Use the item's actual type. DynamicContent and null values are not supported.");

Issue 3.a:

1. Navigate to Administartion -> Settings -> Advanced -> DynamicModules -> Controls -> Telerik.Sitefinity.DynamicTypes.Model.<DynamicModuleName>.<DynamicTypeName>Definition -> Views -> <DynamicModuleName>BackendList -> Dialogs -> ModulePermissionsDialog on permissionsDynamicContent -> Parameters
2. Change
Telerik.Sitefinity.DynamicModules.Model.DynamicContent to Telerik.Sitefinity.DynamicTypes.Model.<DynamicModuleName>.<DynamicTypeName>Definition

Issue 3.b:

Replace the WebForms widget with an MVC widget.
Last Modified Date11/20/2020 6:53 AM
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