_guidelineCategoriesRepo.GetAll().Select(x=>x.MapTo(newGuidelineCategoriesDto())).ToList();...
.NET面试题系列[13] - LINQ to Object "C# 3.0所有特性的提出都是更好地为LINQ服务的" - Learning Hard 02 C# 学习笔记(14)—— LINQ LINQ 是 Lanuage Integrated Query 的缩写,即“语言集成查询”的意思。众所周知,做软件开发离不开数据的,你肯定听过SQL数据库、Oracle数据库或本地XML文档等。每种数据源...
可以这样了讲吧——不管是Linq to sql还是linq to entity他们俩个都离不开linq to object。linq to object是专对内存中的数据进行处理。我们可以看到上面例子中有出现一段queryable.ToList()。如果笔者说ToList()是linq to object会不会有人喷我。为什么笔者说他是linq to object呢?主要是ToList()是对于IEnumer...
public static class DataTableExtensions { public static IList<T> ToList<T>(this DataTable table) where T : new() { IList<PropertyInfo> properties = typeof(T).GetProperties().ToList(); IList<T> result = new List<T>(); foreach (var row in table.Rows) { var item = CreateItemFromRo...
LINQ目前可以对XML, Object, SQL做数据访问,今后还会有LINQ to Entity的功能。 说来惭愧,我也是刚刚才接触LINQ,先从最简单的开始吧,做一个LINQ to Object的例子,实现一个对数组的操作。这个例子套用了今年TechED中海洋兄讲的例子,在此声明。 在这个例子中,我会先通过GetMethods的方法,拿到string的所有方法,接下...
If your table uses an Identity Column for its primary key, asCategorydoes, LINQ to SQL automatically updates your object with that ID once it's been added to the database. As an example, we'll add a newCategoryfor Java. 1. Create new object ...
"Object is currently in use elsewhere" error for picturebox "Parameter is not valid" - new Bitmap() "Recursive write lock acquisitions not allowed in this mode.? "Settings" in DLL project properties and app.config file "The function evaluation requires all threads to run" while accessing mus...
Map the results of the query to a single object or a sequence of objects One last element to add is an object tracker. This is required to track entities instantiated by the mapper. Without it, how would the provider know that an entity has been changed by the application so that it ca...
必须在Map到DTO之前首先对实体进行任何筛选和排序。如果不是，您将收到异常，因为Linq to SQL不知道...
The OfType operator allows users to apply the standard query operators to classic .NET collections like this: Copy // "classic" cannot be used directly with query operators IEnumerable classic = new OlderCollectionType(); // "modern" can be used directly with query operators IEnumerable<object...