parameterized objectquery against a entity data model
What is an ObjectQuery ?
ObjectQuery is a class which is used to construct and execute queries against a Entity data model. Once the ObjectQuery has been executed, the results are returned as ObjectQuery<T>.
A parameterized ObjectQuery is an ObjectQuery with parameters. Adding parameters to queries makes the query more powerful. We can add parameters to the ObjectQuery after we instantiate the Object Query.
The statement
ObjectQuery
Creates a new ObjectQuery
We know that this query returns an ObjectQuery
We need to add parameters to the ObjectQuery prior to the execution. To work with ObjectQuery class, we need to add the System.Data.Objects namespace.
We also need to pass the ObjectContext as a parameter when we instantiate an Objectquery.
using (var context = new SalesOrderManagementEntities()) { string querystring = "SELECT VALUE Customer FROM SalesOrderManagementEntities.Customer AS Customer Where Customer.Name=@Name"; ObjectQueryCustomers = new ObjectQuery (querystring,context); Customers.Parameters.Add(new ObjectParameter("Name", "Vam")); foreach (Customer result in Customers) Console.WriteLine(String.Format("{0} {1}", result.Name, result.CustomerId)); }
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