/// <summary>
/// Retrieves the value of a text attribute over the entire range.
/// </summary>
/// <param name="attribute">The text attribute.</param>
/// <returns>The value of the attribute across the range.
/// If the attribute's value varies over the range then the value is TextPattern.MixedAttributeValue</returns>
public object GetAttributeValue(AutomationTextAttribute attribute)
{
Misc.ValidateArgumentNonNull(attribute, "attribute");
AutomationAttributeInfo ai;
if (!Schema.GetAttributeInfo(attribute, out ai))
{
throw new ArgumentException(SR.Get(SRID.UnsupportedAttribute));
}
object obj = UiaCoreApi.TextRange_GetAttributeValue(_hTextRange, attribute.Id);
if (ai.Type.IsEnum && obj is int)
{
// Convert ints from COM Interop to the appropriate enum type
obj = Enum.ToObject(ai.Type, (int)obj);
}
else if (obj != AutomationElement.NotSupported && ai.ObjectConverter != null)
{
// Use a custom converter, if needed (eg. converts LCIDs to CultureInfo)
obj = ai.ObjectConverter(obj);
}
return(obj);
}
