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 End-User Documentation

FilterControl.MaxOperandsCount Property

Gets or sets the maximum number of atomic operands simultaneously displayed within a group operand. If there are more atomic operands in display mode, the group operand's text representation will be trimmed. In edit mode, the group operand's values will be edited via a CheckedComboBoxEdit control. This feature is supported when the FilterControl is bound to XtraGrid.

Namespace:DevExpress.XtraEditors
Assembly:DevExpress.XtraEditors.v17.2.dll

Expanded Syntax

Property value

Type: Int32
An integer value that specifies the maximum number of atomic operands simultaneously displayed within a group operand.
The default is 20.

Expanded Remarks

Group operands are used to define values for the Is any of and Is none of operators:

If the number of atomic operands in a group operand is equal to or less than MaxOperandsCount, the FilterControl displays all the atomic operands, separating them with a comma. Each operand can be edited within a separate edit box:

If the number of atomic operands is greater than MaxOperandsCount, the following takes place if the FilterControl is bound to Grid Control via the SourceControl property:

  • in display mode, the group operand's text representation is trimmed.

  • in edit mode, the group operand is edited via a CheckedComboBoxEdit control.

If the FilterControl is not bound to XtraGrid, the CheckedComboBoxEdit control can still be used to present a group operand's value. The following example shows how to accomplish this.

Expanded Example - How to use CheckedComboBox control when editing IsAnyOf and IsNoneOf operands in FilterControl bound to any object except XtraGrid

Show Me

A complete sample project is available in the DevExpress Code Examples database at http://www.devexpress.com/example=E4223.

In FilterControl, there are two operand presentation modes when editing the "Is Any Of" and "Is None Of" group operands: simple and advanced. The simple mode is enabled when the number of atomic operands in a group operand is equal to or less than FilterControl.MaxOperandCount. Otherwise the advanced mode is activated, where:

- in display mode, a group operand's text presentation is trimmed.

- in edit mode, the group operand's values are edited with the help of the CheckedComboBoxEdit control.



The advanced operand presentation mode is supported when the FilterControl is bound to the XtraGrid. Otherwise, this feature is not supported.



This example shows how to overcome this limitation by creating a custom SourceControl component and an UnbounFilterColumn descendant.

In the descendant class two members are overridden:

- The AllowItemCollectionEditor property determines whether or not the feature is allowed for certain columns.

- The CreateItemCollectionEditor method creates a CheckedComboBoxEdit control.

Expanded Example

Show Me

A complete sample project is available in the DevExpress Code Examples database at http://www.devexpress.com/example=E4223.

In FilterControl, there are two operand presentation modes when editing the "Is Any Of" and "Is None Of" group operands: simple and advanced. The simple mode is enabled when the number of atomic operands in a group operand is equal to or less than FilterControl.MaxOperandCount. Otherwise the advanced mode is activated, where:

- in display mode, a group operand's text presentation is trimmed.

- in edit mode, the group operand's values are edited with the help of the CheckedComboBoxEdit control.



The advanced operand presentation mode is supported when the FilterControl is bound to the XtraGrid. Otherwise, this feature is not supported.



This example shows how to overcome this limitation by creating a custom SourceControl component and an UnbounFilterColumn descendant.

In the descendant class two members are overridden:

- The AllowItemCollectionEditor property determines whether or not the feature is allowed for certain columns.

- The CreateItemCollectionEditor method creates a CheckedComboBoxEdit control.

Expanded See Also

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