• 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.
• 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 ...
• 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 inLINQ

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() };

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,
}; 
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

正确代码示例：
string strcd = strCD[i];

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。
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• 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
• Linq in Action Linq in Action Linq in Action Linq in Action
• LINQ in Action pdf
• LINQ in Action.pdf 入门教材
• linq to object ,linq to sql ,linq to xml
• Microsoft Linq introduction in Uyghur.
• 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(中文：linq实战) 源代码
• LINQ in Action。In Action系列的外文书籍。
• ## Linqin 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。
• 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
• 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方面的不错的书籍
• 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
• 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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