Take Clause (Visual Basic)
Returns a specified number of contiguous elements from the start of a collection.
Required. A value or an expression that evaluates to the number of elements of the sequence to return.
Take clause causes a query to include a specified number of contiguous elements from the start of a results list. The number of elements to include is specified by the
You can use the
Take clause with the
Skip clause to return a range of data from any segment of a query. To do this, pass the index of the first element of the range to the
Skip clause and the size of the range to the
Take clause. In this case, the
Take clause must be specified after the
When you use the
Take clause in a query, you may also need to ensure that the results are returned in an order that will enable the
Take clause to include the intended results. For more information about ordering query results, see Order By Clause.
You can use the
TakeWhile clause to specify that only certain elements be returned, depending on a supplied condition.
The following code example uses the
Take clause together with the
Skip clause to return data from a query in pages. The GetCustomers function uses the
Skip clause to bypass the customers in the list until the supplied starting index value, and uses the
Take clause to return a page of customers starting from that index value.
Public Sub PagingSample() Dim pageNumber As Integer = 0 Dim pageSize As Integer = 10 Dim customersPage = GetCustomers(pageNumber * pageSize, pageSize) Do While customersPage IsNot Nothing Console.WriteLine(vbCrLf & "Page: " & pageNumber + 1 & vbCrLf) For Each cust In customersPage Console.WriteLine(cust.CustomerID & ", " & cust.CompanyName) Next Console.WriteLine(vbCrLf) pageNumber += 1 customersPage = GetCustomers(pageNumber * pageSize, pageSize) Loop End Sub Public Function GetCustomers(ByVal startIndex As Integer, ByVal pageSize As Integer) As List(Of Customer) Dim customers = GetCustomerList() Dim returnCustomers = From cust In customers Skip startIndex Take pageSize If returnCustomers.Count = 0 Then Return Nothing Return returnCustomers End Function