XmlSerializer属性不适用于某些项目

Question

当某些属性有时可用时尝试序列化项目，有时则不然。问题是错误地我将VerifyMinAmount作为bool，因为这个XmlDeserialize抛出了异常。现在已修复

<items>
    <item idimagelogo="892"  verifyamount="True" receipt="02" >
    </item>
    <item idimagelogo="893"  Receipt="02" >
    </item>
    <item idimagelogo="893"  verifyamount="True" >
    </item>
</items>    

[XmlRoot(ElementName = "item")]
public class Item
{
    [XmlAttribute(AttributeName = "idimagelogo")]
    public string idimagelogo { get; set; }

    [XmlAttribute(AttributeName = "verifyamount")]
    public string VerifyMinAmount { get; set; }

    [XmlAttribute(AttributeName = "receipt")]
    public string Receipt { get; set; }
}

public static T XmlDeserialize<T>(XNode data,string rootAttribute = "") where T : class, new()
{
    if (data == null) {
        return null;
    }

    XmlSerializer ser=null;
    if(String.IsNullOrEmpty(rootAttribute))
        ser = new XmlSerializer(typeof (T));
    else
        ser = new XmlSerializer(typeof(T), new XmlRootAttribute(rootAttribute));

    return (T) ser.Deserialize(data.CreateReader());
}