IEnumerable<ERec> list = retailerList.Cast<ERec>();
lvwRetailStores.DataSource = list.OrderByDescending(r => r.Properties["RS_Partner Type"].ToString())
                                 .ThenBy(r => r.Properties["RS_Title"].ToString());

解决方法

list.Where(r => r.Properties["RS_Partner_Type"] != null && r.Properties["RS_Title"] != null)
    .OrderByDescending(r => r.Properties["RS_Partner Type"].ToString())
    .ThenBy(r => r.Properties["RS_Title"].ToString());

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