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Windows Media Player 11 SDK IWMPQuery.addCondition (VB and C#) 

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IWMPQuery.addCondition (VB and C#)

The addCondition method adds a condition to the compound query using AND logic.

[Visual Basic]
Sub addCondition(
  bstrAttribute As String,
  bstrOperator As String,
  bstrValue As String
)

[C#]
void addCondition (
  string bstrAttribute,
  string bstrOperator,
  string bstrValue
);

Parameters

bstrAttribute

A System.String that is the name of the attribute to be added to the query.

bstrOperator

A System.String that is the operator. See Remarks for supported values.

bstrValue

A System.String that is the attribute value.

Return Value

This method does not return a value.

Remarks

Conditions contained in a compound query are organized into condition groups. Multiple conditions within a condition group are always concatenated by using AND logic. Condition groups are always concatenated to each other by using OR logic. To start a new condition group, call IWMPQuery.beginNextGroup.

Compound queries using IWMPQuery are not case sensitive.

A list of values for the bstrAttribute parameter can be found in Alphabetical Attribute Reference.

The following table lists the supported values for bstrOperator.

String Applies to
BeginsWith Strings
Contains Strings
Equals All types
GreaterThan Numbers, Dates
GreaterThanOrEquals Numbers, Dates
LessThan Numbers, Dates
LessThanOrEquals Numbers, Dates
NotBeginsWith Strings
NotContains Strings
NotEquals All types

Example Code

The following example creates a query, adds two conditions to it, and uses that query to extract the results of the query as a string collection. The results are then displayed in a list box. The AxWMPLib.AxWindowsMediaPlayer object is represented by the variable named player.

[Visual Basic]
' Get a new Query interface.
Dim mc As WMPLib.IWMPMediaCollection2 = player.mediaCollection
Dim q As WMPLib.IWMPQuery = mc.createQuery()

' Add two conditions to the Query. 
q.addCondition("WM/Composer", "Equals", "Antonio Vivaldi")
q.addCondition("Title", "Contains", "Trio")

' Query the media collection and get a string collection containing the result.
' In this case, the string collection will contain the titles of all audio items that
' match the query.
Dim result As WMPLib.IWMPStringCollection2 = mc.getStringCollectionByQuery("Title", q, "audio", "", False)

' Display the results by adding them to a list box.
For i As Integer = 0 To (result.count - 1)

    queryResults.Items.Add(result.Item(i))

Next i

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// Get a new Query interface.
WMPLib.IWMPMediaCollection2 mc = (WMPLib.IWMPMediaCollection2)player.mediaCollection;
WMPLib.IWMPQuery q = mc.createQuery();

// Add two conditions to the Query. 
q.addCondition("WM/Composer", "Equals", "Antonio Vivaldi");
q.addCondition("Title", "Contains", "Trio");

// Query the media collection and get a string collection containing the result.
// In this case, the string collection will contain the titles of all audio items that
// match the query.
WMPLib.IWMPStringCollection2 result = (WMPLib.IWMPStringCollection2)mc.getStringCollectionByQuery("Title", q, "audio", "", false);

// Display the results by adding them to a list box.
for (int i = 0; i < result.count; i++)
{
    queryResults.Items.Add(result.Item(i));
}

Requirements

Version: Windows Media Player 11.

Namespace: WMPLib

Assembly: Interop.WMPLib.dll (automatically generated by Visual Studio)

See Also

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