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 End-User Documentation

RepositoryItemCheckEdit.QueryValueByCheckState Event

Allows for custom conversion from the check state (checked, unchecked and indeterminate) to an edit value.

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

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type QueryValueByCheckStateEventArgs containing data related to this event.

The following QueryValueByCheckStateEventArgs properties provide information specific to this event.
Property Description
CheckState Gets the editor's current check state.
Handled Gets or sets whether the event is handled and no default processing is required.
Value Use this property to set the edit value that corresponds to the current check state.

Expanded Remarks

The QueryValueByCheckState and QueryCheckStateByValue events allow you to manually convert from values to check states and vice versa.

See the QueryCheckStateByValue topic to learn more.

Expanded Example

This example demonstrates how to handle QueryCheckStateByValue and QueryValueByCheckState events in order to use a check editor to display and modify data from the bound data field.

The example assumes that a check editor is bound to a specific dataset field whose type is not obviously known and should be determined programmatically. The available data types that the field can take on are boolean, string and integer. So the field can contain the following combinations representing an option value (these values will be used to set the editor's CheckEdit.EditValue property):

  • True, False - for the boolean type;
  • "Yes", "No", "?" - for the string type;
  • 1, 0, -1 - for the integer type.

It is evident that making use of ValueChecked, ValueUnchecked and ValueGrayed properties is insufficient in this case. Thus, the example requires and implements a custom "edit value -> check state" and "check state -> edit value" conversion logic, which is illustrated by the sample code below.

Expanded See Also

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