Parameters

Pass the arguments

Execute and ExecuteAsync take the arguments as an object?[], with exactly one entry per parameter of the method, in order. A wrong number of arguments throws an ArgumentException. For a method without parameters, null and an empty array are both accepted.

The executor does not apply the default values of optional parameters: pass a value for each parameter.

Keep default values

Create(methodInfo, parameterDefaultValues) stores one default value per parameter with the executor, and GetDefaultValueForParameter(index) returns it. Use them to build the arguments when the caller has no value for some parameters, for instance a parameter that a framework did not bind:

var methodInfo = typeof(Sample).GetMethod(nameof(Sample.AsyncMethod))!;
var executor = ObjectMethodExecutor.Create(methodInfo, parameterDefaultValues: [0, 100]);

// The caller has a value for the first parameter only
var parameters = new object?[] { 5, executor.GetDefaultValueForParameter(1) };
Assert.Equal(105, await executor.ExecuteAsync(new Sample(), parameters));

The executor never reads these values: they are only stored for the caller. Create throws an ArgumentException when the array does not have one entry per parameter, and GetDefaultValueForParameter throws an InvalidOperationException when the executor was created without default values.