In a join clause, if only one of the comparison keys is a nullable value type, you can cast the other to a nullable value type in the query expression. In the following example, assume thatEmployeeIDis a column
var query = from item in dataSource [join clause] [where clause] [group by clause] [orderby clause] select item;from：指定数据源和范围变量，用于指定要查询的集合或数据源以及每个元素的范围变量。join：用于指定多个数据源之间的关联操作。where：用于指定筛选条件，过滤满足特定条件的...
i am working wiht VS 2010 AND beginner in LINQ . how to use SQL 'IN' Clause in Linq Query All replies (3) Saturday, June 25, 2011 4:01 PM ✅Answered | 6 votes Hi RageshShiva; Using the List object Contains method in the Where clause will create the IN T-SQL clause...
http://dotnet.org.za/hiltong/archive/2008/03/12/linq-to-sql-dynamic-in-clause.aspx One of the things that we need to do every now and then is be able to select from a table based on a specific list of primary key IDs. For instance, we may have a UI with checkboxes that allow ...
When using LINQ to query nongeneric IEnumerable collections such as ArrayList, you must explicitly declare the type of the range variable to reflect the specific type of the objects in the collection. If you have an ArrayList of Student objects, your from clause should look like this: C# Copy...
In the previous example, thewhereclause filters out all null elements in the categories sequence. This technique is independent of the null check in the join clause. The conditional expression with null in this example works becauseProducts.CategoryIDis of typeint?, which is shorthand forNullable...
Some query operations, such as Count or Max, have no equivalent query expression clause and must therefore be expressed as a method call. Method syntax can be combined with query syntax in various ways. Query expressions can be compiled to expression trees or to delegates, depending on the typ...
KristoferA is right. L2S does not directly support such predicate in join condition. But you can take advantage of another fact here: The predicate of join can be transferred to the where clause in case ofinnerjoins. i.e. the following two tsql queries are logically equivalent (you ...
whitch is a simple join , I know that anonymous type could be used for two columns join , but the second condition in "ON" clause is bind to a const value, so I don't know how to translate the above sql command to LINQ , is there anyone could help me?
It is always the first clause in a query operation. This may seem counterintuitive if you are used to SQL and expect select to be first, but if you consider that we need to know what to work on before we determine what to return, it makes sense. In fact, if we weren’t already ...