linq-to-entities

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Bulk Insert in mysql Table using Linq to entity

I have millions of record that I want to insert in mysql table and I am using linq t开发者_如何学JAVAo entity for this. I want that it will use minimum database resource for inserting records.[详细]

2023-04-10 04:40 分类：问答
How to build boolean combination of two MethodCallExpressions

The example uses Northwind database. The database has a \"Orders\" table which has \"ShipName\" and \"ShipAddress\" columns. The entity framework model in c# program has a[详细]

2023-04-10 04:21 分类：问答
Linq to Entities, getting Max date when there is no data

Here\'s my statement: startDate = (from n in db.Nodes where n.SeedID == mySeedID select n.CreatedDate).Max<DateTime>();[详细]

2023-04-10 01:43 分类：问答
EF 4.1 Code First : How to load entity references into memory?

I just started working with EF 4.1 Code First and noticed that by default, references (navigation properties), are not loaded into memory with a POCO entity you queried with LINQ-to-Entity. I have had[详细]

2023-04-10 00:00 分类：问答
how to get two column values in a single query using linq to entities

I have a member table with columns memberid Firstname( values like jo开发者_运维百科hn,pop...)[详细]

2023-04-09 20:05 分类：问答
Where does "it" come from in this example of ObjectSet<T>.SelectValue?

productQuery1.SelectValue<Int32>(\"it.ProductID\"); How would I know what \"it\" means here? Whole example from MSDN docs[详细]

2023-04-09 16:02 分类：问答
Converting query expression to Linq method syntax

I use EF 4 and C#. I have a query like: var contentsAuthor = from c in context.CmsContents join a in context.CmsAuthors on c.AuthorId equals a.AuthorId[详细]

2023-04-09 12:17 分类：问答
Linq, OrderByDescending, First, and the nefarious DefaultIfEmpty

Hopefully this is a simple matter of me not understanding something basic.Below are two Linq statements from an application I\'m working on.[详细]

2023-04-09 10:25 分类：问答
Can I create nested classes when using Linq-To-Entities?

I\'m still learning Entity Framework and Linq-To-Entities, and I was wondering if a statement of this kind is possible:[详细]

2023-04-09 10:25 分类：问答
In Linq to EF 4.0, I want to return rows matching a list or all rows if the list is empty. How do I do this in an elegant way?

This sort of thing: Dim MatchingValues() As Integer = {5, 6, 7} Return From e in context.entity Where MatchingValues.Contains(e.Id)[详细]

2023-04-09 10:15 分类：问答