/// <summary>
/// Obtain the backing field for an auto-implemented property.
/// </summary>
/// <param name="property">An auto-implemented property.</param>
/// <param name="bindingFlags">Flags filtering the visibility of the property.</param>
/// <returns>The field for an auto-implemented property if it exists.</returns>
/// <exception cref="ArgumentNullException"><paramref name="property"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentException"><paramref name="bindingFlags"/> is not a valid enumeration.</exception>
public static FieldInfo?GetAutoBackingField(this PropertyInfo property, BindingFlags bindingFlags = BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy)
{
if (property == null)
{
throw new ArgumentNullException(nameof(property));
}
if (!bindingFlags.IsValid())
{
throw new ArgumentException($"The { nameof(BindingFlags) } provided must be a valid enum.", nameof(bindingFlags));
}
var backingFieldName = $"<{ property.Name }>k__BackingField";
var field = property.DeclaringType.GetField(backingFieldName, bindingFlags);
var compilerAttr = field?.GetCustomAttribute <CompilerGeneratedAttribute>(true);
return(compilerAttr != null ? field : null);
}
