Linq用long where子句

Question

有一个更好的方法吗？我试图遍历partsToChange集合并构建where子句,但它将它们组合在一起而不是对它们进行ORing.我也不想在partsToChange列表中明确地对每个项执行相等.

var partsToChange = new Dictionary<string, string> {
    {"0039", "Vendor A"},
    {"0051", "Vendor B"},
    {"0061", "Vendor C"},
    {"0080", "Vendor D"},
    {"0081", "Vendor D"},        
    {"0086", "Vendor D"},
    {"0089", "Vendor E"},
    {"0091", "Vendor F"},
    {"0163", "Vendor E"},
    {"0426", "Vendor B"},
    {"1197", "Vendor B"}
};

var items = new List<MaterialVendor>();
foreach (var x in partsToChange)
{
    var newItems = (
    from m in MaterialVendor 
    where 
        m.Material.PartNumber == x.Key 
        && m.Manufacturer.Name.Contains(x.Value)
    select m
    ).ToList();
    items.AddRange(newItems);
}

附加信息:我在LINQPad中工作,这是一个LinqToSql查询.这里MaterialVendor既是类又是DataContext表.

编辑:LinqToSql详细信息.

这似乎是我在可读性和降低复杂性方面找到的最佳方法.它还具有未明确定义集合类型的额外好处.这意味着我可以改变匿名类型的回复.

var predicate = PredicateBuilder.False<MaterialVendor>();

foreach (var x in partsToChange)
{
    var item = x;
    predicate = predicate.Or (m =>
        m.Material.PartNumber == item.Key 
        && m.Manufacturer.Name.Contains(item.Value));
}

var items = from m in MaterialVendor.Where(predicate)
    select m;

Answer 1

[编辑]更好,因为partsToChange是Dictionary:

var items = MaterialVendor.Where(m =>
                m.Manufacturer.Name.Contains(partsToChange[m.Material.PartNumber])
            ).ToList();