Populating parameter value for nullable types when input binding data is missing the value for the parameter

[kshyju]

Populating parameter value for nullable types when input binding data is missing the value for the parameter.
Currently when the parameter is nullable type & default value not defined, we are throwing an exception

azure-functions-dotnet-worker/src/DotNetWorker.Core/Context/Features/DefaultFunctionInputBindingFeature.cs

Lines 71 to 81 in 5045bf5

	if (parameter.HasDefaultValue)
	{
	parameterValues[i] = parameter.DefaultValue;
	}
	else
	{
	// We could not find a value for this param. should throw.
	errors ??= new List<string>();
	errors.Add(
	$"Could not populate the value for '{parameter.Name}' parameter. Consider updating the parameter with a default value.");
	}

which was different than previous behavior where null value was assigned.

In this PR, If the parameter is nullable or reference types and no value was present in input binding data, we will set the value as null.

Behavior with changes from this PR, when input binding data is missing the value for the parameter/binding.

Parameter signature	Populated parameter value	Error
int foo		Could not populate the value for 'foo' parameter. Consider updating the parameter with a default value
int? foo	null
string foo	null
string? foo	null
int foo = 100	100
int? foo = 100	100
string foo = "bar"	"bar"

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  • Otherwise: I've added my notes to release_notes.md
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• I have added all required tests (Unit tests, E2E tests)

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