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Want an easy way to query and update data? To query different data stores with a single tool? LINQ is the answer. Language-Integrated Query (LINQ) extends Visual Studio with powerful query capabilities based on C# and Visual Basic. LINQ makes big data doable.
In LINQ with C# Essential Training, engineer Olivia Chiu introduces techniques for querying, updating, and transforming data with LINQ. She covers standard queries—such as finding overlaps in two datasets and creating hierarchies—as well as complex chained queries. She also shows how to group and join LINQ queries with lambda expressions, and use LINQ to query SQL databases and XML documents. Last but not least, Olivia provides tips for optimizing the performance of your queries.Skills covered in this course
Welcome
- The second part of a LINQ Query is the query itself. Once you know your dataset you need to figure out what information you are looking for. The query specifies what to retrieve from the sequence or what transformations to apply to each element in the sequence. In the example program the range variable cust is used to reference each element in the sequence that will be looked at. In the first query the where clause or operator looks over a list of customers. For each customer in the list I want to know if the state property value is equal to OR. If the element fits the criteria LINQ holds on to it and moves to the next query operator. The next operator, the select clause specifies that I want to select the result of the previous query as one of the data elements to return. An important thing to realize is that the query isn't being executed at this point in the program. No data is being returned yet. So far the program has only specified the information that will be needed to…Practice while you learn with exercise files
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