XML读取节点和子节点

我有这个xml:

<?xml version="1.0" encoding="UTF-8"?>
<Dictionary>
<Object name="Ship">
    <Struct_Name>tb_Ship</Struct_Name>
        <Owner> ..... </Owner>
           <Parameters>
        <Parameter>
        <Eng_Name>.....</Eng_Name>
        <Discr>.....</Discr>
        <Type>.....</Type>
        </Parameter>
        <Parameter>
        <Eng_Name>......</Eng_Name>
        <Discr>.........</Discr>
        <Type>.................</Type>
        </Parameter>
</Object>
        <Object name="Car">
        <Struct_Name>tb_Car</Struct_Name>
        <Owner> ..... </Owner>
           <Parameters>
        <Parameter>
        <Eng_Name>.....</Eng_Name>
        <Discr>.....</Discr>
        <Type>.....</Type>
        </Parameter>
        <Parameter>
        <Eng_Name>......</Eng_Name>
        <Discr>.........</Discr>
        <Type>.................</Type>
        </Parameter>
   </Object>
</Dictionary>

我试着像这样读取这个XML:

foreach(var Object in Objects)
print the whole elements values
   foreach(var Parameter in Parameters Of Current Object)
      print the whole elements of current parameter

我试着用2 foreach，它不工作总是得到异常，对象不设置为对象的实例，就像这样。有一种方法可以像我想要的那样读取xml吗?

XmlDocument doc = new XmlDocument();
doc.Load("file.xml");
XmlNodeList parameters = doc.SelectNodes("Dictionary/Object/Parameters/Parameter"); 
// or doc.SelectNodes("//Parameter"); 
foreach(XmlNode parameter in parameters)
{
    // print the whole element
}