Error on the Aspose application

Aspose.Cells Product Family
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1

I decompiled an Aspose application and when I try to run it it’s giving me countless errors i don’t understand where the problem might be.

errors like
‘AutoFilter._0005()’ is a method, which is not valid in the given context
‘Cell._0003(_0006_2005, int, int, int, Worksheet, bool)’ is a method, which is not valid in the given context

and many more like that

2

@MaduvhaRa

The errors you see are typical when code that was decompiled from an obfuscated Aspose assembly is compiled again:

  • Method names such as AutoFilter._0005() or Cell._0003(...) are generated by the obfuscator – they are not valid entry points in the original source.
  • The decompiled code is missing the required Aspose library references (e.g., Aspose.Cells, Aspose.Pdf, etc.) and often targets a different .NET runtime than the one you are using.

What to do next

  1. Use the original source – if you have access to the original project, compile it instead of the decompiled version. Decompilation cannot reliably recreate the exact source, especially when the assembly is obfuscated.
  2. Add the correct Aspose DLLs
    • Identify which Aspose product the code uses (e.g., Aspose.Cells for the Worksheet/Cell references).
    • Download the matching version from the Aspose website or your NuGet feed.
    • Add a reference to that DLL (or the NuGet package) in your project and ensure the using statements match the namespace (e.g., using Aspose.Cells;).
  3. Target the appropriate .NET framework – the original assembly may have been built for .NET Framework 4.x, .NET Core, or .NET 5/6. Set your project’s target framework accordingly.
  4. Re‑compile and capture the full error list – if you still get “method is not valid in the given context” errors, post the exact compiler output, the project file, and the list of referenced Aspose DLL versions.

What we need to help you further

  • Product name and version (Aspose.Cells, Aspose.Pdf, etc.).
  • Target .NET runtime/framework of your project.
  • A minimal reproducible sample (e.g., a small .csproj with the decompiled file and the referenced Aspose DLLs).
  • The complete compiler error messages.

Provide those details and we can pinpoint the missing references or version mismatches.

3

@MaduvhaRa,

Please note that the Aspose.Cells library is provided with obfuscation enabled. This means that class names, method names, and field names may be replaced with tokens such as _0003, _0005, _0041, and similar. Additionally, some methods and properties may be merged or transformed, making the compiled IL challenging to interpret. Decompilers may not always be able to reconstruct valid C# code from the obfuscated IL. It is unlikely that runnable source code can be obtained from an obfuscated commercial library like Aspose.Cells (or other Aspose libraries) due to the heavy obfuscation of method names, class names, private members, and other internal APIs. If you are attempting to reverse-engineer Aspose.Cells, recovering readable code may not be feasible as the obfuscated members are intentionally designed to be unreadable. If possible, could you kindly zip and share the source application utilizing Aspose.Cells? We would be happy to review it further.

4

i don’t have the original source code hence why i decompiled it

i have the correct ones

5

@MaduvhaRa

The errors you see (AutoFilter._0005(), Cell._0003(...) etc.) are generated by the obfuscator that Aspose ships with — the original class and method names are replaced with tokens such as _0003, _0005 【Professionalize.Discourse】. A decompiler cannot reliably reconstruct valid C# from that obfuscated IL, so the resulting source will not compile even when the correct Aspose.Cells DLLs are referenced 【amjad.sahi】.

What can be done

  1. Original source – the only reliable way to rebuild the application is to obtain the original, non‑obfuscated project from the vendor that produced it.
  2. If the original source cannot be provided – you can only use the Aspose library directly (e.g., write new code against Aspose.Cells) rather than trying to re‑compile the decompiled output.
  3. If you still want us to investigate – please supply:
    • Product name and exact version of the Aspose DLL(s) you are referencing.
    • Target .NET framework/runtime of your project (e.g., .NET Framework 4.8, .NET 6).
    • The full compiler error list (copy‑paste the complete output).
    • A minimal reproducible project (e.g., a small .csproj that includes the decompiled file and the referenced DLLs).

Without the original source, the decompiled code will continue to produce “method is not valid in the given context” errors because the obfuscation removes the necessary metadata. Provide the details above if you want us to check for any version‑mismatch or missing references; otherwise the only viable path is to rewrite the required functionality using the proper Aspose API.

6

@MaduvhaRa

As mentioned in the previous reply, the DLL library is obfuscated. Decompiling the DLL library will show you some meaningless strings.

Would you like to describe your requirements in detail? If you can provide sample files, runnable test code, and screenshots highlighting errors, it is very helpful for us to locate the issue. We will check it soon.

7
8

@MaduvhaRa,

When I click on your Google Drive link, it prompts for credentials. Could you kindly provide a download link that does not require credentials (ID, password, etc.) so we can access it smoothly? Additionally, may I confirm if you are sharing your sample app and sample files with us?

9

https://www.dropbox.com/scl/fi/wl8n61rjbinuc2s3f8qh9/Aspose.zip?rlkey=n2a7vbyiakclr328bqr4pacd7&st=amgkk2vp&dl=0

10

@MaduvhaRa,

Thank you for sharing the Dropbox link to the archive.

I have downloaded and extracted the archive. It appears that the provided file contains the decompiled application/solution. As previously mentioned, it is not possible to retrieve runnable source code from an application that uses an obfuscated library such as Aspose.Cells (or other Aspose libraries). This is due to the extensive obfuscation applied to method names, class names, private members, and other internal APIs for security purposes. Please note that the Aspose.Cells library is intentionally obfuscated to ensure security. Consequently, reverse-engineering an application involving Aspose.Cells to recover readable code may not be feasible or reliable.

We request you to either get the original source application. If you cannot obtain the original source app (that uses Aspose libraries), kindly recreate the application by yourselves or share detailed requirements along with sample Excel and other files. This will enable us to guide you effectively on how to create the application using Aspose.Cells APIs to accomplish your tasks. Thank you for your understanding.