[Video] cannot apply indexing with [] to an expression

Alternatively, you can use the Request.Query.TryGetValue method to retrieve the parameter value and handle scenarios where the parameter is not present:

if (HttpContext.Request.Query.TryGetValue("parameterName", out var parameterValue))
{
    // Use the parameterValue
}
else
{
    // Parameter is not present
}

By using either of these approaches, you can access the values of query string parameters in ASP.NET Core without encountering the "cannot apply indexing with [] to an expression of type QueryString" error.

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