ABP Framework 4.x to 4.3 Migration Guide

This version comes with some changes in the startup template, mostly related to Blazor UI. This document explains the breaking changes. However, it is suggested to compare the startup templates manually to see all the changes and apply to your solution.


  • app.UseVirtualFiles() has been marked as obsolete. Use app.UseStaticFiles() instead. ABP will handle the virtual file system integrated to the static files middleware.

Blazor UI

Implemented the Blazor Server Side support with this release. It required some packages and namespaces arrangements. Existing Blazor (WebAssembly) applications should done the changes explained in this section.

Namespace Changes

  • AbpBlazorMessageLocalizerHelper -> moved to Volo.Abp.AspNetCore.Components.Web
  • AbpRouterOptions -> moved to Volo.Abp.AspNetCore.Components.Web.Theming.Routing
  • AbpToolbarOptions and IToolbarContributor -> moved to Volo.Abp.AspNetCore.Components.Web.Theming.Toolbars
  • IAbpUtilsService -> moved to Volo.Abp.AspNetCore.Components.Web
  • PageHeader -> moved to Volo.Abp.AspNetCore.Components.Web.Theming.Layout.

In practice, if your application is broken because of the Volo.Abp.AspNetCore.Components.WebAssembly.* namespace, please try to switch to Volo.Abp.AspNetCore.Components.Web.* namespace.

Remember to change namespaces in the _Imports.razor files.

Package Changes

No change on the framework packages, but module packages are separated as Web Assembly & Server;

  • Use Volo.Abp.Identity.Blazor.WebAssembly NuGet package instead of Volo.Abp.Identity.Blazor package. Also, change AbpIdentityBlazorModule usage to AbpIdentityBlazorWebAssemblyModule in the [DependsOn] attribute on your module class.
  • Use Volo.Abp.TenantManagement.Blazor.WebAssembly NuGet package instead of Volo.Abp.TenantManagement.Blazor package. Also, change AbpTenantManagementBlazorModule usage to AbpTenantManagementBlazorWebAssemblyModule in the [DependsOn] attribute on your module class.
  • Use Volo.Abp.PermissionManagement.Blazor.WebAssembly NuGet package instead of Volo.Abp.PermissionManagement.Blazor package. Also, change AbpPermissionManagementBlazorModule usage to AbpPermissionManagementBlazorWebAssemblyModule in the [DependsOn] attribute on your module class.
  • Use Volo.Abp.SettingManagement.Blazor.WebAssembly NuGet package instead of Volo.Abp.SettingManagement.Blazor package. Also, change AbpSettingManagementBlazorModule usage to AbpSettingManagementBlazorWebAssemblyModule in the [DependsOn] attribute on your module class.
  • Use Volo.Abp.FeatureManagement.Blazor.WebAssembly NuGet package instead of Volo.Abp.FeatureManagement.Blazor package. Also, change AbpFeatureManagementBlazorModule usage to AbpFeatureManagementBlazorWebAssemblyModule in the [DependsOn] attribute on your module class.

Other Changes

  • EntityAction.RequiredPermission has been marked as obsolete, because of performance reasons. It is suggested to use the Visible property by checking the permission/policy yourself and assigning to a variable.
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