Where Clause (Visual Basic)
Specifies the filtering condition for a query.
Syntax
Where condition
Parts
condition
Required. An expression that determines whether the values for the current item in the collection are included in the output collection. The expression must evaluate to a Boolean value or the equivalent of a Boolean value. If the condition evaluates to True, the element is included in the query result; otherwise, the element is excluded from the query result.
Remarks
The Where clause enables you to filter query data by selecting only elements that meet certain criteria. Elements whose values cause the Where clause to evaluate to True are included in the query result; other elements are excluded. The expression that is used in a Where clause must evaluate to a Boolean or the equivalent of a Boolean, such as an Integer that evaluates to False when its value is zero. You can combine multiple expressions in a Where clause by using logical operators such as And, Or, AndAlso, OrElse, Is, and IsNot.
By default, query expressions are not evaluated until they are accessed—for example, when they are data-bound or iterated through in a For loop. As a result, the Where clause is not evaluated until the query is accessed. If you have values external to the query that are used in the Where clause, ensure that the appropriate value is used in the Where clause at the time the query is executed. For more information about query execution, see Writing Your First LINQ Query.
You can call functions within a Where clause to perform a calculation or operation on a value from the current element in the collection. Calling a function in a Where clause can cause the query to be executed immediately when it is defined instead of when it is accessed. For more information about query execution, see Writing Your First LINQ Query.
Example 1
The following query expression uses a From clause to declare a range variable cust for each Customer object in the customers collection. The Where clause uses the range variable to restrict the output to customers from the specified region. The For Each loop displays the company name for each customer in the query result.
Sub DisplayCustomersForRegion(ByVal customers As List(Of Customer),
ByVal region As String)
Dim customersForRegion = From cust In customers
Where cust.Region = region
For Each cust In customersForRegion
Console.WriteLine(cust.CompanyName)
Next
End Sub
Example 2
The following example uses And and Or logical operators in the Where clause.
Private Sub DisplayElements()
Dim elements As List(Of Element) = BuildList()
' Get a list of elements that have an atomic number from 12 to 14,
' or that have a name that ends in "r".
Dim subset = From theElement In elements
Where (theElement.AtomicNumber >= 12 And theElement.AtomicNumber < 15) _
Or theElement.Name.EndsWith("r")
Order By theElement.Name
For Each theElement In subset
Console.WriteLine(theElement.Name & " " & theElement.AtomicNumber)
Next
' Output:
' Aluminum 13
' Magnesium 12
' Silicon 14
' Sulfur 16
End Sub
Private Function BuildList() As List(Of Element)
Return New List(Of Element) From
{
{New Element With {.Name = "Sodium", .AtomicNumber = 11}},
{New Element With {.Name = "Magnesium", .AtomicNumber = 12}},
{New Element With {.Name = "Aluminum", .AtomicNumber = 13}},
{New Element With {.Name = "Silicon", .AtomicNumber = 14}},
{New Element With {.Name = "Phosphorous", .AtomicNumber = 15}},
{New Element With {.Name = "Sulfur", .AtomicNumber = 16}}
}
End Function
Public Class Element
Public Property Name As String
Public Property AtomicNumber As Integer
End Class
