DXErrorProvider.ContainerControl Property

Gets or sets a control which owns the controls monitored for errors.

Namespace: DevExpress.XtraEditors.DXErrorProvider

Assembly: DevExpress.XtraEditors.v20.1.dll

Declaration

[DefaultValue(null)]
[DXCategory("Behavior")]
public ContainerControl ContainerControl { get; set; }
<DefaultValue(Nothing)>
<DXCategory("Behavior")>
Public Property ContainerControl As ContainerControl

Property Value

Type Default Description
ContainerControl

null

The ContainerControl that contains the controls monitored for errors by the DXErrorProvider.

Remarks

A DXErrorProvider component can be used to track errors on the data source level, and automatically display any error within bound editors. In this mode, the ContainerControl property must be set to the control which owns bound editors. Typically, this is a form. If the ContainerControl property is not set, errors will not be displayed within bound editors.

When adding a DXErrorProvider to a form at design time, the ContainerControl property is set to this form automatically. When creating a DXErrorProvider in code, the property must be initialized manually.

Refer to the DXErrorProvider.DataSource topic, for information on handling errors on the data source level.

Examples

The following example demonstrates how to implement error notifications for a custom business object at the data source level, using the 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 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 IDXDataErrorInfo interface and returns the error information via the 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 DXErrorProvider.DataSource property. In this example, the DXErrorProvider.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:

DXErrorProvider_DataSource_Ex

using DevExpress.XtraEditors.DXErrorProvider;

private void Form1_Load(object sender, EventArgs e) {
    // Specify the type of records stored in the BindingSource.
    bindingSource1.DataSource = typeof(MyRecord);
    // Create an empty MyRecord and add it to the BindingSource.
    MyRecord rec = new MyRecord();            
    rec.FirstName = "";
    rec.LastName = "";
    bindingSource1.Add(rec);
    // Bind the text editors to the MyRecord.FirstName and MyRecord.LastName properties.
    textEdit1.DataBindings.Add(new Binding("EditValue", this.bindingSource1, 
      "FirstName", true));
    textEdit2.DataBindings.Add(new Binding("EditValue", this.bindingSource1, 
       "LastName", true));
    // Bind the DXErrorProvider to the data source.
    dxErrorProvider1.DataSource = bindingSource1;
    // Specify the container of controls (textEdit1 and textEdit2) 
    // which are monitored for errors.
    dxErrorProvider1.ContainerControl = this;
}

//...
// A custom record class.
public class MyRecord : IDXDataErrorInfo {
    private string firstName;
    private string lastName;
    public MyRecord() { }
    public string FirstName {
        get { return firstName; }
        set { firstName = value; }
    }
    public string LastName {
        get { return lastName; }
        set { lastName = value; }
    }
    // Implements the IDXDataErrorInfo.GetPropertyError method.
    public void GetPropertyError(string propertyName, ErrorInfo info) {
        if (propertyName == "FirstName" && FirstName == "" ||
            propertyName == "LastName" && LastName == "") {
            info.ErrorText = String.Format("The '{0}' field cannot be empty", propertyName);
        }
    }
    // IDXDataErrorInfo.GetError method
    public void GetError(ErrorInfo info) { }        
}
See Also