Articolo
11/18/2011

Strings.Filter Method (array<String[], String, Boolean, CompareMethod)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Returns a zero-based array containing a subset of a String array based on specified filter criteria.

Namespace: Microsoft.VisualBasic
Assembly: Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

Syntax

'Declaration
Public Shared Function Filter ( _
    Source As String(), _
    Match As String, _
    Include As Boolean, _
    Compare As CompareMethod _
) As String()

public static string[] Filter(
    string[] Source,
    string Match,
    bool Include,
    CompareMethod Compare
)

Parameters

Source
Type: array<System.String[]
Required. One-dimensional array of strings to be searched.

Match
Type: System.String
Required. String to search for.

Include
Type: System.Boolean
Optional. Boolean value indicating whether to return substrings that include or exclude Match. If Include is True, the Filter function returns the subset of the array that contains Match as a substring. If Include is False, the Filter function returns the subset of the array that does not contain Match as a substring.

Compare
Type: Microsoft.VisualBasic.CompareMethod
Optional. Numeric value indicating the kind of string comparison to use. See "Settings" for values.

Return Value

Type: array<System.String[]
Returns a zero-based array containing a subset of a String array based on specified filter criteria.

Remarks

If no matches of Match are found within Source, the Filter function returns an empty array. An error occurs if Source is set to Nothing or is not a one-dimensional array.

The array returned by the Filter function contains only enough elements to contain the number of matched items.

The Compare argument can have the following values.

Constant	Description
CompareMethod.Binary	Performs a binary comparison
CompareMethod.Text	Performs a textual comparison

Examples

This example demonstrates the use of the Filter function.

Dim TestStrings(2) As String
TestStrings(0) = "This"
TestStrings(1) = "Is"
TestStrings(2) = "It"
Dim subStrings() As String
' Returns ["This", "Is"].
subStrings = Filter(TestStrings, "is", True, CompareMethod.Text)
' Returns ["This"].
subStrings = Filter(TestStrings, "is", True, CompareMethod.Binary)
' Returns ["Is", "It"].
subStrings = Filter(TestStrings, "is", False, CompareMethod.Binary)

Version Information

Silverlight

Supported in: 5, 4, 3

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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