47 lines
1.5 KiB
C#
47 lines
1.5 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
|
|
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
|
|
|
|
using System;
|
|
using System.ComponentModel;
|
|
using System.Reflection;
|
|
using Microsoft.Extensions.Internal;
|
|
|
|
namespace Microsoft.AspNetCore.Mvc.Internal
|
|
{
|
|
public static class ParameterDefaultValues
|
|
{
|
|
public static object[] GetParameterDefaultValues(MethodInfo methodInfo)
|
|
{
|
|
if (methodInfo == null)
|
|
{
|
|
throw new ArgumentNullException(nameof(methodInfo));
|
|
}
|
|
|
|
var parameters = methodInfo.GetParameters();
|
|
var values = new object[parameters.Length];
|
|
|
|
for (var i = 0; i < parameters.Length; i++)
|
|
{
|
|
values[i] = GetParameterDefaultValue(parameters[i]);
|
|
}
|
|
|
|
return values;
|
|
}
|
|
|
|
private static object GetParameterDefaultValue(ParameterInfo parameterInfo)
|
|
{
|
|
if (!ParameterDefaultValue.TryGetDefaultValue(parameterInfo, out var defaultValue))
|
|
{
|
|
var defaultValueAttribute = parameterInfo.GetCustomAttribute<DefaultValueAttribute>(inherit: false);
|
|
defaultValue = defaultValueAttribute?.Value;
|
|
|
|
if (defaultValue == null && parameterInfo.ParameterType.IsValueType)
|
|
{
|
|
defaultValue = Activator.CreateInstance(parameterInfo.ParameterType);
|
|
}
|
|
}
|
|
return defaultValue;
|
|
}
|
|
}
|
|
}
|