31 lines
1.1 KiB
C#
31 lines
1.1 KiB
C#
|
namespace System.Web.Mvc {
|
|||
|
|
using System;
|
|||
|
|
using System.ComponentModel;
|
|||
|
|
using System.Reflection;
|
|||
|
|
|
|||
|
|
internal static class ParameterInfoUtil {
|
|||
|
|
|
|||
|
|
public static bool TryGetDefaultValue(ParameterInfo parameterInfo, out object value) {
|
|||
|
|
// this will get the default value as seen by the VB / C# compilers
|
|||
|
|
// if no value was baked in, RawDefaultValue returns DBNull.Value
|
|||
|
|
object defaultValue = parameterInfo.DefaultValue;
|
|||
|
|
if (defaultValue != DBNull.Value) {
|
|||
|
|
value = defaultValue;
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// if the compiler did not bake in a default value, check the [DefaultValue] attribute
|
|||
|
|
DefaultValueAttribute[] attrs = (DefaultValueAttribute[])parameterInfo.GetCustomAttributes(typeof(DefaultValueAttribute), false);
|
|||
|
|
if (attrs == null || attrs.Length == 0) {
|
|||
|
|
value = default(object);
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
value = attrs[0].Value;
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
}
|
|||
|
|
}
|