Solving the AllFindedBrands Property Not Passed to Controller Action in ASP.NET Core

Описание: Discover how to properly pass complex model properties in ASP.NET Core's controller actions with practical examples and solutions.
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This video is based on the question https://stackoverflow.com/q/74016542/ asked by the user 'Serg.T.Russia' ( https://stackoverflow.com/u/9141152/ ) and on the answer https://stackoverflow.com/a/74022453/ provided by the user 'Rena' ( https://stackoverflow.com/u/11398810/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Issue: AllFindedBrands Not Passed to Controller Action

When working with ASP.NET Core, developers sometimes encounter issues where certain properties in their model do not get passed correctly to controller actions. A common example of this is when the AllFindedBrands property is not successfully passed to the SearchBrandResult action within a controller. In this guide, we will explore the root cause of this problem and provide two effective solutions for passing complex model properties seamlessly.

Why Is AllFindedBrands Not Being Passed?

The problem arises from the fact that the AllFindedBrands property is a complex type (a list of brands), and the default routing mechanism within ASP.NET Core does not handle the dynamic binding of complex types through the URL parameters (asp-route-*). This results in the model not being populated as expected when the form is submitted.

Solutions: How to Properly Pass Complex Model Properties

To tackle the issue of passing complex model properties like AllFindedBrands effectively, there are two recommended approaches:

Solution 1: Using asp-all-route-data

This approach leverages the ability to bind all route data from a dictionary, enabling the passing of complex model contents as route values.

Define Your ViewModel

First, ensure your SearchViewModel and BrandList classes are defined correctly:

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Modify Your View

In the Razor view, create a dictionary to store your brand names and utilize the asp-all-route-data attribute in your form:

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Solution 2: Utilizing Hidden Inputs

Another effective approach is to use hidden input fields in your form to directly submit the values of the complex model properties.

Update Your View for Hidden Inputs

Using a loop, add hidden input fields for each member of the AllFindedBrands list:

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

Conclusion

By implementing one of the above solutions, you can successfully pass complex model properties such as AllFindedBrands from your view to the controller action in ASP.NET Core. Choose the method that best suits your needs based on your application’s structure and requirements. With these strategies, you can ensure that all relevant data is transmitted accurately, paving the way for a robust and functional ASP.NET Core application.