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  • Think in LINQ

    2018-05-25 15:48:34
    This book won’t teach you the basics of LINQ. It will teach you how to use it appropriately. Having a jackhammer is great only if you know how to use it properly; otherwise, you are not ...in the book.
  • Thinking in LINQ

    2015-01-09 10:27:23
    LINQ-to-Reflection, you can do a lot of meta programming in .NET. ■ Introduction xxxii • Chapter 8: Exploratory Data Analysis This chapter shows how you can use LINQ to solve several data analysis ...
  • Update in LINQ

    2007-06-09 05:35:00
    Yichamps.cnYichamps 正在编写Silverlight,Linq ORM模块 Thats quite easily to do update in LINQ below: using System;using System.Collections.Generic;using System.Linq;using System.Text;usin
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  • Select case in LINQ

    千次阅读 2013-06-23 21:42:44
    how can I translate this into LINQ? select t.age as AgeRange, count(*) as Users from ( select case when age between 0 and 9 then ' 0-25' when age between 10 and 14 then '26-40' when a
    how can I translate this into LINQ?
    
    select t.age as AgeRange, count(*) as Users
    from (
      select case  
        when age between 0 and 9 then ' 0-25'
        when age between 10 and 14 then '26-40'
        when age between 20 and 49 then '60-100'
        else '50+' end as age
      from user) t
    group by t.age

    Thank you!


    Maybe this works:
    from u in users
    let range = (u.Age >= 0  && u.Age < 10 ? "0-25" :
                 u.Age >= 10 && u.Age < 15 ? "26-40" :
                 u.Age >= 15 && u.Age < 50 ? "60-100" :
                "50+")
    group u by range into g
    select new { g.Key, Count=g.Count() };

    check this may help you
    var query = from grade in sc.StudentGrade
                            join student in sc.Person on grade.Person.PersonID
                                          equals student.PersonID
                            select new
                            {
                                FirstName = student.FirstName,
                                LastName = student.LastName,
                                Grade = grade.Grade.Value >= 4 ? "A" :
                                            grade.Grade.Value >= 3 ? "B" :
                                            grade.Grade.Value >= 2 ? "C" :
                                            grade.Grade.Value != null ? "D" : "-"
                            }; 

    the last maybe right!
    Something like this?
    var users = (from u in Users
                 select new
                 {
                    User = u,
                    AgeRange =
                        u.Age >= 0 && u.Age <= 9 ? "0-25"  :
                        u.Age <= 14              ? "26-50" :
                        u.Age <= 49              ? "60-100":
                                                   "50+"
                  }).GroupBy(e => e.AgeRange);


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  • 报错信息:The method 'Skip' is only supported for sorted input in LINQ to Entities. The method 'OrderBy' must …… EF 使用ToPagedList。 这是没有使用OrderBy或者OrderByDescending方法就直接调用了...

    报错信息:The method 'Skip' is only supported for sorted input in LINQ to Entities. The method 'OrderBy' must ……

    EF 使用ToPagedList。

    这是没有使用OrderBy或者OrderByDescending方法就直接调用了ToPagedList方法。

    像我这样调用即可:

     有个网友(@ _York)给我评论的很对,简单一句话:分页需要排序。

    转载于:https://www.cnblogs.com/dawenyang/p/8253473.html

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  • 错误代码示例: 其中strCD[i]为数组的一个值 T_BUSINESSTYPE type...注:linq to entities中不支持这种数组索引,linq to sql 中支持这种数组索引。 可以通过定义个变量转化数组数据,来用linq to entities。

    错误代码示例:

    其中strCD[i]为数组的一个值
    T_BUSINESSTYPE typeModel = ibusinesstype.FirstOrDefault(t => t.TYPE_CD == strCD[i]);
    

    正确代码示例:

    string strcd = strCD[i];
    T_BUSINESSTYPE typeModel = ibusinesstype.FirstOrDefault(t => t.TYPE_CD == strcd);
    

    注:linq to entities中不支持这种数组索引,linq to sql 中支持这种数组索引。
    可以通过定义个变量转化数组数据,来用linq to entities。

    展开全文
  • The Dynamic Expression API extends the core LINQ API with the ability to dynamically create string based queries that are constructed at run-time. The API provides Dynamic parsing of strings to
  • 出现这个错误提示可以用DbFunctions.TruncateTime 将Linq中entity的DateTime转化一下再使用,如下所示: var anyCalls = _db.CallLogs.Where(x => DbFunctions.TruncateTime(x.DateTime) == callDateTime.Date...
  • Thinking_In_Linq.pdf

    2021-07-04 16:23:19
    Thinking In Linq
  • Linq in Action

    2009-07-01 08:35:25
    Linq in Action Linq in Action Linq in Action Linq in Action
  • LINQ IN Action

    2018-10-31 15:38:17
    LINQ in Action pdf
  • LINQ in Action

    2013-03-18 00:33:45
    LINQ in Action.pdf 入门教材
  • linq in action

    2010-03-20 13:13:27
    linq to object ,linq to sql ,linq to xml
  • Linq In Uyghur

    2011-03-14 20:32:50
    Microsoft Linq introduction in Uyghur.
  • Linq in action

    2009-07-29 09:47:05
    Linq in action 英文原版:LINQ to Objects, LINQ to XML,和 LINQ to SQL等,源码也包括在其中。
  • Linq In Action源码

    2010-09-09 11:56:38
    Linq In Action(中文:linq实战) 源代码
  • LINQ in Action PDF

    2010-05-09 11:44:06
    LINQ in Action。In Action系列的外文书籍。
  • Linq in 与 not in

    千次阅读 2014-03-11 14:16:05
    Linq in 用法  var lisss= (from a in list where (new int?[] { 1, 2 }).Contains(a.ColumnId) select a).ToList(); Linq not in 用法  var lisss= (from a in list where !(new int?[] { 1, 2 }).Contains(a.Col
  • 最好的LINQ书籍,适合入门学者。LINQ实战英文版。最好的LINQ书籍,适合入门学者。LINQ实战英文版。
  • LinqInAction

    2008-04-10 13:34:05
    英文PDF http://linqinaction.net/<br>http://cid-97a8942c99775679.skydrive.live.com/embedrowdetail.aspx/Public/Manning.LINQ.in.Action.zip
  • LINQ in Action.rar

    2021-02-25 14:05:33
    LINQ in Action.rar
  • linq实战(linq in action)

    2013-03-11 14:57:30
    本书第一部分介绍了LINQ技术及C#和VB为此提供的新语言特性,第二、三、四部分详细介绍了LINQ的三大主要功能LINQ to Objects、LINQ to SQL、LINQ to XML,第五部分研究了LINQ的可扩展性、在应用程序中使用各种LINQ...
  • Linq In Action

    2008-06-02 17:13:30
    linq方面的不错的书籍
  • Linqin用法

    2014-09-10 00:53:09
    详细的描述了linqin用法,相信对于大家会很有帮助的 欢迎各位前来下载
  • LinQ in 写法

    2019-10-08 17:35:01
    有时候会碰到一个需求,又一堆id 1,2,3,4,循环遍历id再去数据库查不仅效率低,而且代码难看,可以用in来实现: 1 string[] codes = item.ExamPaperCode.Split(";"); 2 var courses = from a in db.DltBdCourse ...

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