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  [Collapse]DevExpress.XtraEditors.DXErrorProvider
   [Collapse]DXErrorProvider Class
     DXErrorProvider Members
    [Expand]DXErrorProvider Constructor
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 End-User Documentation

DXErrorProvider Class

Provides error management for DevExpress bound and unbound editors.

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

Expanded Syntax

Expanded Remarks

The DXErrorProvider's functionality is similar to the standard System.Windows.Forms.ErrorProvider component. It provides a mechanism for indicating to an end-user that an error is associated with an editor. If an error is associated with an editor, the DXErrorProvider will display an error icon. Hovering over it will invoke a hint with an error description:

An error can be associated with an editor as follows:
  • directly via the SetError method. An editor and error information (error text and error icon type) that need to be associated are passed as this method's parameters.
  • indirectly on the data source level (for bound editors).

    To provide error information on the data source level, a business object must implement the DevExpress.XtraEditors.DXErrorProvider.IDXDataErrorInfo interface. After a DXErrorProvider has been bound to the data source via the DataSource and DataMember properties, it handles the errors supplied via this interface, and display corresponding error icons within bound editors.

Unlike the standard System.Windows.Forms.ErrorProvider component, the DXErrorProvider supports multiple error icon types: Critical , Warning and Information . In addition, it's possible to provide custom error icons for editors via the GetErrorIcon event.
Note

The DXErrorProvider can indicate errors only for DevExpress editors (editors derived from the BaseEdit class).

Expanded Example

The following example demonstrates how to implement error notifications for a custom business object at the data source level, using the DevExpress.XtraEditors.DXErrorProvider.IDXDataErrorInfo interface. Error information will be handled by the DXErrorProvider component, which will indicate any error to an end-user.

In this example, the business object is represented by a custom MyRecord class. It contains two properties (FirstName and LastName) that cannot be empty. This class' records are stored in a System.Windows.Forms.BindingSource component and edited using text editors (the FirstName and LastName properties are edited in a textEdit1 and textEdit2 controls respectively).

The requirement is to visually indicate errors within the editors, if the record's FirstName or LastName property contain an empty string. In this example, the error information is provided on the data source level. The MyRecord class implements the DevExpress.XtraEditors.DXErrorProvider.IDXDataErrorInfo interface and returns the error information via the DevExpress.XtraEditors.DXErrorProvider.IDXDataErrorInfo.GetPropertyError method. To display the supplied errors within the editors, a DXErrorProvider component needs to be added to the form. It indicates errors as error icons, which can be hovered over to display error text.

To automatically track errors supplied by a data source, the DXErrorProvider component must be bound to this data source via the DataSource property. In this example, the DataSource property is set to the BindingSource.

The following image illustrates the resulting form after it has been opened at runtime. The editors contain empty strings, and as a result error icons are displayed within the editors:

Expanded Example

The following example shows how to supply a custom error icon via the GetErrorIcon event. In this event, a custom icon () is provided when the error type is set to DevExpress.XtraEditors.DXErrorProvider.ErrorType.User1.

The result is illustrated below:

Expanded Inheritance Hierarchy

System.Object
    System.MarshalByRefObject
       System.ComponentModel.Component
          DXErrorProvider

Expanded See Also

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