Linq-获得介于下限和上限之间的值 [英] Linq - getting a value that is between a lower limit and upper limit

问题描述

我有一个费用清单(linq到sql实体-如果相关)-费用上限，费用下限(均为十进制值).我传入了property value-例如90000，我想检查此property值最佳是否匹配 one (或 first 值)费用列表中的一个.

I have a list of Fees (linq to sql entity- if relevant) - Upper Fee, Lower Fee (both are decimal values). I am passing in a property value - say 90000 and I want to check if this property value best matches one (or first value out of many) from the list of fees.

费用可能是...

(较低的费用-较高的费用)

0 - 50000
50001 - 75000
75001 - 90000
90001 - 140000
190000 - 500000

从这些值中，最适合90000匹配 75001-90000频段，因此我想提取该 FeeDetail 实体.我真的不知道该使用什么运算符，不胜感激，到目前为止我的代码是...

Out of these values, 90000 is best matched for something like 75001 - 90000 band, so I want to pull out that FeeDetail entity. I dont really know what operator to use, any help is appreciated, my code so far is...

    [Test]
    public void GetFeeRange()
   {
        const int id = 44;
        var propValue = 90000;

        //get a specific fee entity, then get the range of fee details...
        var recommendedFees = RepoSession.All<Fee>()
            .Where(x =>
                   x.ClientSurveyTypeID == id)
            .GroupJoin(_readOnlySession.All<FeeDetail>(),
                       x => x.FeeID,
                       y => y.FeeID,
                       (x, y) => new
                                     {
                                         FeeDetail = y.DefaultIfEmpty()
                                     })
            .Select(x => x.FeeDetail)
            .SingleOrDefault();

        Assert.IsNotNull(recommendedFees);

       //order fees by lowest fee - *the bit I am stuck on*
        var bestMatch = recommendedFees.OrderBy(x => x.Lower)
            .TakeWhile(x => propValue >= x.Lower || propValue <= x.Upper)
            .FirstOrDefault();



    }

问题-我将如何执行范围检查?我需要什么linq运算符?不确定我是否应该花点时间从那范围内获得最好的费用?

Question- how would I perform the range checks? What operator of linq do I need? Not sure if I should perform a takewhile then, get the best fee from that range?

注意:收费很容易...

NOTE: the fees could very easily be...

(较低的费用-较高的费用)

0 - 50000
50001 - 75000
95001 - 140000
190000 - 500000

如果找到最佳匹配，将其拔出 OR 以获得最接近的匹配...如果一个匹配(不够)完全匹配，也许我可以显示可用匹配的列表

If a best match is found, pull that out OR get the closest match... maybe I can show a list of available matches if one is not (near enough) an exact match

推荐答案

简单的.Where应该可以:

var bestMatch = recommendedFees
              .Where(x => propValue >= x.Lower && propValue <= x.Upper)
              .OrderBy(x => x.Lower)                  
              .FirstOrDefault();

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