I'm changing the font color to Transparent based on a condition in my report.
This works in the Standalone Designers for .NET and for .NET Framework.
In the WPF Report Viewers for .NET and .NET Framework though the Transparent color is not respected. Other Font colors like green are properly shown conditionally in the WPF viewers.

In PDF rendering, my SVG image does not get clipped according to the design-time look of the report while in Excel(XLSX), the same SVG content appears almost correctly.

As documented slightly comically here: https://www.telerik.com/forums/can-not-for-the-life-of-me-get-a-report-to-run  , and confirmed by other users on that thread, Telerik reporting can be incredibly unintuitive in the configuration steps.

Having just been through the wringer yet again - I just wanted to copy the configuration from one working project to another, and it's taken me about 6 hours of tearing my hair out to get it working, I'm giving some suggestions for improving this. These really are bugs, not features, hence the bug report.

My use case is the HTML5 report viewer running off the REST service in dotNet 6.

(1) Try systematically breaking one component at a time of the configuration, and check that the error message is correct.

eg. in builder.Services.AddControllersWithViews().AddNewtonsoftJson();

if .AddNewtonsoftJson() is left out, we get the error:

Cannot access the Reporting REST service. (serviceUrl = '/api/TelerikReportHandler/'). Make sure the service address is correct and enable CORS if needed. (https://enable-cors.org)

It is almost impossible to diagnose this - there is no reason that error could not indicate that NewtonsoftJson is not available. I working it out by going through the white paper, and thought 'that's in there but it's surely not going to fix that error message' but I added it anyway and hey presto, fixed.

Another example, not having the .css file referenced correctly in the HTML file referencing the viewer template, displayed a message telling me that the report viewer did not match the REST service version number, a completely incorrect error. Again, I realised the error, thought 'there is no way this is going to fix it', and it did. That's how misleading the errors are.

(2) Don't cache everything

Once I finally got it all working, I decided to break things deliberately to get the error messages so I could record them for my information next time I have to go around this loop. However, I then found that nothing on the client side could be broken. That .css file that was missing a minute ago and causing the error, now I could delete it completely and the reports ran just fine. I could delete the entire template folder and same behaviour, even after closing and restarting the project.

So clearly, once it's working your code is caching the files and/or config internally somewhere. That's a really, really astoundingly bad idea.

The reason I had all these problems in the first place was that I copied all the configuration code and files from a working project, and then the project I copied it to didn't work. I triple checked everything. No go.

I now realise that the working project had probably cached all the files it needed, but then I must have updated the project with non working files, but the project ignored all that and continued to work with its cached files. When I copied the files to a new project, only then did the problem become evident. This is incredibly unintuitive, frustrating and undocumented.

Telerik is not a bad product, but I have never failed to take less than half a day every time I have needed to change anything. If I thought the competitiors were any better, I'd jump ship but frankly I think they're all probably the same.

But if you took this advice, the process would become way, way easier to work through. All we need is good, clear, specific error messages and, for the love of god, *no* caching.

Running the Native Blazor Viewer page VS item template in a project that has authentication and authorization configured, breaks the application.

If the application contains an authorize attribute in its _Imports.razor file, the Reporting-related usings are placed in the middle of it.

@attribute [Authorize@using Telerik.Blazor
@using Telerik.Blazor.Components
@using Telerik.ReportViewer.BlazorNative
]

Additionally, the declaration that introduces the EndpointMiddleware in the Program.cs file of the application is added directly after the UseRouting declaration. This breaks applications that already have the UseAuthentication and UseAuthorization declarations because the UseAuthorization call needs to appear between the UseRouting and UseEndpoints calls.

app.UseRouting();
app.UseEndpoints(endpoints =>
{
	endpoints.MapControllers();
	// ... 
});

app.UseAuthentication();
app.UseAuthorization();

It would be lovely to be able to string multiple emails in the "To" and "CC" fields so users could email a batch of users at once. In my scenario there is an email distro group that needs to get a report when printed. I could write logic to pass multiple email accounts into the "CC" field, however, the functionality doesn't exist. Below is a visual example of what I'd like to achieve.

Currently, the Map's TileProvider UrlTemplate property may be set only to a hard-coded string. It would be very useful to be configurable as an Expression to allow for dynamic values.

When I am sending an email through the native Blazor Report Viewer and I type in the CC field, even if I delete what I have typed there, an "Email format is not valid" error will be displayed below the input and I will be unable to send the email.

This does not occur if I do not type in the CC input at all and it also works if I provide a valid email there.

When HtmlTextBox is empty and i click some expression is added like this " = Len("bla")", but when something is already put is added like this "{Len("bla")}

Problem with version " =" is it does not work with neither text.

This is my scenerio, I pick some function for example Len(), and then i want to add some info, and i've got

= Len("numbers") numbers

and there is error in viewer


but when i put first "numbers" and click expresion len
expression is added with {} and it works ok in viewer

this behavior is annoying, in htmltextbox expressions should always be added with {}

Currently the interface for `IReportSourceResolver.Resolve` only allows for a synchronous implementation of `Resolve`. It'd be nice if the interface allowed for an asynchronous implementation, too.

This is in reference to Telerik Reporting API Server with a custom report source resolver.

In some scenarios, it is necessary to execute a special code when the user cancels report rendering in Report Viewers.
A special event raised when the report rendering is canceled will be very useful for these scenarios.

When the Report has a Picture Watermark or BackgroundOveray with Opacity 1, in the preview of the viewer, in PDF and PPTX the watermark is displayed behind the text. In DOCX though, the watermark covers the text.

Since R3 2023, all HTML5IntegrationDemo examples found in the Telerik Reporting installation directory (C:\Program Files (x86)\Progress\Telerik Reporting R3 2023\Examples\CSharp) target .NET 6.

To work around the issue, open the .csproj file of each demo and set the target framework to the corresponding version.

The native Angular Report Viewer does not expose a 'setReportSource' or similar method that can be used to update the reportSource object of the viewer after initialization.

This means that the parameters or the report loaded by the viewer cannot be changed in code and I have to expose the report parameters and use Navigate To Report actions for loading different reports.

For my Object Data Source, I am using a nuget package that has a dependency on Microsoft.Extension.Primitives.  The custom assembly is correctly registered in the designer's configuration file and the DLLs are copied to the Report Designer (.NET version) directory. I get this error:

Telerik.Reporting.Expressions.InvalidExpressionException: An error has occurred while executing function UsePrimitives(). Check the InnerException for more information.
 ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 ---> System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Extensions.Primitives, Version=3.1.18.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. Could not find or load a specific file. (0x80131621)
File name: 'Microsoft.Extensions.Primitives, Version=3.1.18.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'
 ---> System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Extensions.Primitives, Version=3.1.18.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
   at System.Runtime.Loader.AssemblyLoadContext.LoadFromPath(IntPtr ptrNativeAssemblyLoadContext, String ilPath, String niPath, ObjectHandleOnStack retAssembly)
   at System.Runtime.Loader.AssemblyLoadContext.LoadFromAssemblyPath(String assemblyPath)
   at System.Reflection.Assembly.LoadFrom(String assemblyFile)
   at System.Reflection.Assembly.LoadFromResolveHandler(Object sender, ResolveEventArgs args)
   at System.Runtime.Loader.AssemblyLoadContext.InvokeResolveEvent(ResolveEventHandler eventHandler, RuntimeAssembly assembly, String name)
   at System.Runtime.Loader.AssemblyLoadContext.OnAssemblyResolve(RuntimeAssembly assembly, String assemblyFullName)
   at ClassLibrary1.Class1.UsePrimitives()
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Span`1& arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   at Telerik.Reporting.Expressions.FunctionNodeEval.Eval(Object row, Object context)
   --- End of inner exception stack trace ---
   at Telerik.Reporting.Expressions.FunctionNodeEval.Eval(Object row, Object context)
   at Telerik.Reporting.Expressions.EvalObject.Eval(ExpressionNode expressionNode, Object data, Object context)
   at Telerik.Reporting.Processing.ProcessingElement.Evaluate(Object value, Object data, EvalObject evalObject)
   at Telerik.Reporting.Processing.ProcessingElement.Evaluate(Object value)
   at Telerik.Reporting.Processing.TextBox.ProcessItem()
   at Telerik.Reporting.Processing.ReportItemBase.ProcessElement()
   at Telerik.Reporting.Processing.ProcessingElement.Process(IDataMember dataContext)

When using the HTML5 Report Viewers, if I override the GetDocumentFormats() method of the ReportsController and return a localized list, the export dropdown in the toolbar is still populated with the default values.

On the other hand, the available export formats list is respected in the email dialog.

In both scenarios, the dropdown with the rendering formats should respect the overridden method's return value.

The following exception can be thrown when setting the Value of a PictureBox to an invalid type:

System.ArgumentException: You can assign System.String, IImage, System.Drawing.Image or SkiaImage objects only.
at Telerik.Reporting.PictureBox.set_Value(Object value) 

This is misleading because an object of type System.Drawing.Image is not supported when using the Skia graphics engine. Passing an SKImage does not work either due to an error in the processing stage.

If you need to use a System.Drawing.Image object or an SKBitmap instance, you can take advantage of the DrawingFactory class.

When a report that has no significant content is added to a report book, an invalid entry inside the report book's ToC is added. The page number shown is zero and trying to navigate to the page throws an error "Resource with name ... not found."

When the service of the Web Report Designer is running in a .NET Framework application, the preview page of the WebServiceDataSource component displays [object Object] instead of the data string.

The WRD front end expects the ReportDesignerController's PreviewWebServiceData(DataSourceInfo) method to return stringified JSON but instead, it currently(R3 2023) returns a JSON.

As a workaround, the method can be overridden so that the string result is returned instead:

        public override IHttpActionResult PreviewWebServiceData(DataSourceInfo dataSourceInfo)
        {
            var baseResult = (ResponseMessageResult)base.PreviewWebServiceData(dataSourceInfo);
            var jsonString = baseResult.Response.Content.ReadAsStringAsync().Result;

            return Ok(jsonString);
        }