LINQ for Visual VB 2005 - download pdf or read online

ISBN-10: 1430202564

ISBN-13: 9781430202561

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The output for Listing 1-25 firstPress: LINQ to Objects 39 Min and Max The Min and Max methods return the minimum and the maximum element within a sequence, respectively. _ Public Shared Function Min(ByVal source As IEnumerable(Of Numeric)) As Numeric _ Public Shared Function Min(Of T)(ByVal source As IEnumerable(Of T)) As T _ Public Shared Function Min(Of T)(ByVal source As IEnumerable(Of T), _ ByVal selector As Func(Of T, Numeric)) As Numeric _ Public Shared Function Min(Of T, S)(ByVal source As IEnumerable(Of T), _ ByVal selector As Func(Of T, S)) As S _ Public Shared Function Min(ByVal source As IEnumerable(Of Numeric)) As Numeric _ Public Shared Function Min(Of T)(ByVal source As IEnumerable(Of T)) As T _ Public Shared Function Min(Of T)(ByVal source As IEnumerable(Of T), _ ByVal selector As Func(Of T, Numeric)) As Numeric _ Public Shared Function Min(Of T, S)(ByVal source As IEnumerable(Of T), _ ByVal selector As Func(Of T, S)) As S When the code processes the query expression, the Min and Max operators enumerate the source sequence and call the selector for each element, finding the minimum and maximum.

The output of Listing 1-13 Listing 1-14 uses an index to specify the element position in the sequence. Listing 1-14. Write(result) End Sub End Class This code snippet creates an anonymous type called Projection, formed by the full name of the person anticipated by the element position in the sequence. See Figure 1-7 for the output. Figure 1-7. The output of Listing 1-14 SelectMany This operator is similar to Select because it allows us to define the elements to pick from a sequence. The difference is in the return type.

If it implements the ICollection(Of T) type then its Count method is used. If it doesn’t, the source sequence is enumerated, incrementing a number that represents the final count value. The latter uses the predicate firstPress: LINQ to Objects 37 function parameter, returning the count of elements against which the specified condition is true. We have already used the Count operator in the “Grouping Operator” section; see Listing 1-19 for an example of the Count operator. Sum The Sum method computes the sum of numeric values within a sequence.

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LINQ for Visual VB 2005


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