How can I resolve receiving null while passing QueryParameters in .NET MAUI?

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If you are receiving null while passing QueryParameters in .NET MAUI, there are several possible reasons and solutions:

1. Make sure that you are passing the QueryParameters correctly. QueryParameters should be passed as a dictionary of key-value pairs, and should be appended to the URL string with a question mark "?" followed by the key-value pairs separated by ampersands "&". For example:

// Define the QueryParameters dictionary
var queryParameters = new Dictionary<string, string>
{
    { "name", "John" },
    { "age", "30" }
};

// Construct the URL string with QueryParameters
var url = $"http://example.com/home?{string.Join("&", queryParameters.Select(kv => $"{kv.Key}={kv.Value}"))}";

1. Check if the QueryParameters are being lost during navigation. If you are using a navigation framework like NavigationView, it may be stripping out the QueryParameters during navigation. To preserve the QueryParameters, you can use the parameter preservation feature of the navigation framework. For example, in NavigationView, you can set the NavigationCacheMode property to "Enabled" to preserve the QueryParameters.

2. Verify that the endpoint you are calling is accepting QueryParameters. Some endpoints may only accept data in the request body or as part of the URL path, and may not recognize QueryParameters. Check the documentation or API reference of the endpoint to see how it accepts data.

3. Check if there are any errors or exceptions being thrown during the request. If there are errors or exceptions, they may be causing the QueryParameters to be lost. Check the logs or error messages to see if there are any issues with the request.

4. Finally, if none of the above solutions work, try debugging the code step by step to see where the QueryParameters are being lost or becoming null. This may help you identify the root cause of the issue and find a solution.