Скачать или смотреть Understanding the System.Object[*] Dimension in C# for Excel VSTO Add-Ins

Learn how to efficiently determine the dimension of `System.Object[*]` in C# when converting an Excel VSTO Add-In from VB.NET using `Application.Evaluate()`.
---
This video is based on the question https://stackoverflow.com/q/62396753/ asked by the user 'Raghu' ( https://stackoverflow.com/u/9156775/ ) and on the answer https://stackoverflow.com/a/62406097/ provided by the user 'Raghu' ( https://stackoverflow.com/u/9156775/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Dimension of System.Object[*] C#

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Resolving Dimension Issues with System.Object[*] in C# for Excel VSTO Add-Ins

When transitioning from VB.NET to C# for your Excel VSTO (Visual Studio Tools for Office) Add-Ins, you might encounter certain challenges that can be puzzling, especially when dealing with types such as System.Object[*]. One common issue arises when you attempt to retrieve the dimensions of the object returned by Application.Evaluate().

This article will explore a solution to this dimensionality problem, enhancing your understanding and providing you with a practical approach for smooth conversions.

Problem Overview

During the conversion process, when the Application.Evaluate() method is called, you may face the following error:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates a complication when trying to directly cast the output of the Evaluate() function into a specific array type in C# . The original VB.NET implementation handled dimension evaluation seamlessly, but let's understand how to achieve it in C# .

Original VB.NET Code

The original implementation in VB.NET for getting the dimension looks like this:

[[See Video to Reveal this Text or Code Snippet]]

This function loops through the dimensions until it can no longer access the upper bound of the matrix, thus determining how many dimensions the matrix has.

C# Conversion Challenges

In the C# version of the code, the challenge was to effectively evaluate and obtain the dimensions of the matrix without running into casting issues. The initial attempt ended in errors because C# handles arrays and types differently from VB.NET.

Initial C# Code Attempt

The first C# attempt was as follows:

[[See Video to Reveal this Text or Code Snippet]]

This code attempts to cast the object to an Array type directly, which leads to casting issues with System.Object[*].

The Solution

To resolve this issue effectively, the revised solution is much simpler and directly retrieves the rank of the array, eliminating the complex looping mechanism. Here's the working C# code:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Solution

Type Checking: The function first checks if the type is a single value (either double or string). If it is, we return 0, indicating a single dimension.

Casting: The object is cast to an Array.

Utilization of Rank: The use of CastedMat.Rank directly provides the number of dimensions the array contains without the need for a loop, thus streamlining the process.

Conclusion

Transitioning from VB.NET to C# for Excel VSTO Add-Ins can be challenging, particularly when dealing with complex data types like System.Object[*]. By understanding the appropriate casting and using C# ’s properties effectively, you can avoid runtime errors and efficiently obtain the dimensions of arrays returned from Application.Evaluate().

This refined approach not only fixes the problem but enhances performance and readability. Now you are equipped with a clear method to seamlessly adapt your code from VB.NET to C# .