LINQ to XML和GridView.ImageField

XDocument xmlDoc = XDocument.Load(Server.MapPath(\"XMLFile.xml\"));

var q = from c in xmlDoc.Descendants(\"Images\")
        where c.Element(\"PropertyId\").Value.ToString() == DropDownList1.SelectedValue.ToString()
        select new
        {
            Id = c.Element(\"PropertyId\").Value,
            Thumb = c.Element(\"ThumbUrl\").Value                
        };
GridView1.DataSource = q;
GridView1.DataBind();

<asp:GridView runat=\"server\">
    <Columns>
        <ImageField DataImageUrlField=\"PhotoPath\" />
    </Columns>
</<asp:GridView>

string selectedValue =  DropDownList1.SelectedValue.ToString(); // cache it!
var q = from c in xmlDoc.Descendants(\"Images\")
        where c.Element(\"PropertyId\").Value.ToString() == selectedValue 
        select new
        {
            PhotoPath = c.Element(\"PhotoPath\").Value         
        };

GridView1.DataSource = q;
GridView1.DataBind();