Hi!
I am a little trying the radzen trial trying some small things to find out if i can use this in future projects.
If i try to create a CRUD Page with new and edit by using a table that uses a reference to another table the combobox in new and edit seems to be broken. It seems to work on a datagrid with the same datasource.
Here ist the MS-SQL for the 2 Tables:
USE [CManagement]
GO
/****** Object: Table [dbo].[alg_kunden] Script Date: 01.10.2019 15:06:30 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[alg_kunden](
[GUID_Kunde] [uniqueidentifier] ROWGUIDCOL NOT NULL,
[Kundenname] [nvarchar](max) NOT NULL,
CONSTRAINT [PK_alg_kunden] PRIMARY KEY CLUSTERED
(
[GUID_Kunde] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE [dbo].[alg_kunden] ADD CONSTRAINT [DF_alg_kunden_GUID_Kunde] DEFAULT (newid()) FOR [GUID_Kunde]
GO
USE [CManagement]
GO
/****** Object: Table [dbo].[zem_stundenliste] Script Date: 01.10.2019 15:06:55 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[zem_stundenliste](
[GUID_Zeiterfassung] [uniqueidentifier] ROWGUIDCOL NOT NULL,
[Kunde] [uniqueidentifier] NOT NULL,
[Tag] [date] NULL,
[Stundenanzahl] [float] NULL,
[Beschreibung] [text] NULL,
CONSTRAINT [PK_zem_stundenliste] PRIMARY KEY CLUSTERED
(
[GUID_Zeiterfassung] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE [dbo].[zem_stundenliste] ADD CONSTRAINT [DF_zem_stundenliste_GUID_Zeiterfassung] DEFAULT (newid()) FOR [GUID_Zeiterfassung]
GO
ALTER TABLE [dbo].[zem_stundenliste] WITH CHECK ADD CONSTRAINT [FK_t.ZEM.Stundenliste_t.ALG.Kunden] FOREIGN KEY([Kunde])
REFERENCES [dbo].[alg_kunden] ([GUID_Kunde])
GO
ALTER TABLE [dbo].[zem_stundenliste] CHECK CONSTRAINT [FK_t.ZEM.Stundenliste_t.ALG.Kunden]
GO
I generated CRUD sages by using "ZemStundenliste" and did no change to any page.
On the Edit i get this:
If i start the application and try to add a new record - and get an error in the console output:
dotnet: info: Microsoft.EntityFrameworkCore.Database.Command[20100]
Executing DbCommand [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT [z].[GUID_Zeiterfassung], [z].[Beschreibung], [z].[Kunde], [z].[Stundenanzahl], [z].[Tag], [a].[GUID_Kunde], [a].[Kundenname]
FROM [dbo].[zem_stundenliste] AS [z]
INNER JOIN [dbo].[alg_kunden] AS [a] ON [z].[Kunde] = [a].[GUID_Kunde]
dotnet: info: Microsoft.EntityFrameworkCore.Database.Command[20100]
Executing DbCommand [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT [a].[GUID_Kunde], [a].[Kundenname]
FROM [dbo].[alg_kunden] AS [a]
dotnet: warn: Microsoft.AspNetCore.Components.Server.Circuits.RemoteRenderer[100]
Unhandled exception rendering component: Object reference not set to an instance of an object.
System.NullReferenceException: Object reference not set to an instance of an object.
at Radzen.PropertyAccess.GetValue(Object value, String path)
at Radzen.PropertyAccess.GetItemOrValueFromProperty(Object item, String property)
at Radzen.Blazor.RadzenDropDown.BuildRenderTree(RenderTreeBuilder __builder)
at Microsoft.AspNetCore.Components.ComponentBase.<.ctor>b__6_0(RenderTreeBuilder builder)
at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.RenderInExistingBatch(RenderQueueEntry renderQueueEntry)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()
dotnet: fail: Microsoft.AspNetCore.Components.Server.Circuits.CircuitHost[111]
Unhandled exception in circuit 'fbY_Qv3H0H4T9mRT-C8i9V8MDDVg3OfCy-8VqKsNg34'.
System.NullReferenceException: Object reference not set to an instance of an object.
at Radzen.PropertyAccess.GetValue(Object value, String path)
at Radzen.PropertyAccess.GetItemOrValueFromProperty(Object item, String property)
at Radzen.Blazor.RadzenDropDown.BuildRenderTree(RenderTreeBuilder __builder)
at Microsoft.AspNetCore.Components.ComponentBase.<.ctor>b__6_0(RenderTreeBuilder builder)
at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.RenderInExistingBatch(RenderQueueEntry renderQueueEntry)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()
dotnet: info: Microsoft.AspNetCore.Routing.EndpointMiddleware[1]
Executed endpoint '/_blazor'
Am I doing something wrong? Thanks 