The requested page is not available for the requested platform. You are viewing the content for Default platform.

ModelEditorGroupingHelper Class

Provides helper methods and properties used to replace or customize the default grouping mechanism in the Model Editor's Nodes Tree.

Namespace: DevExpress.ExpressApp.ModelEditor

Assembly: DevExpress.ExpressApp.v19.1.dll

Declaration

public class ModelEditorGroupingHelper
Public Class ModelEditorGroupingHelper

Remarks

To customize the Model Editor nodes grouping, access the ModelEditorGroupingHelper instance using the ModelEditorGroupingHelper.Instance property. Place your code in the platform-agnostic module's constructor. For instance, the following code groups the child nodes of the IModelValidationRules node. The parent node type is passed to the ModelEditorGroupingHelper.RegisterNodeGroupPathDelegate method.

using DevExpress.ExpressApp; 
using DevExpress.ExpressApp.Model; 
using DevExpress.ExpressApp.ModelEditor; 
using DevExpress.ExpressApp.Validation;
// ...
public sealed partial class MainDemoModule : ModuleBase {
    public MainDemoModule() {
        InitializeComponent();
        ModelEditorGroupingHelper.Instance.RegisterNodeGroupPathDelegate(
        typeof(IModelValidationRules), node => ValidationGroupPathCalculator("TargetType.Name", node));
    }
    public string[] ValidationGroupPathCalculator(string propertyName, IModelNode modelNode) {
        string groupName = "";
        object propertyValue = ModelEditorGroupingHelper.Instance.GetPropertyValue(propertyName, modelNode);
        if (propertyValue != null) {
            groupName = propertyValue.ToString();
        }
        return ModelEditorGroupingHelper.Instance.SplitGroupPath(groupName, modelNode);
    }
    // ...
}

As the result, the child nodes of the Validation | Rules node are grouped as follows:

ModelEditorGroupingHelper

Important

Do not access ModelEditorGroupingHelper from multiple modules in the solution to avoid design-time issues in the Model Editor.

Inheritance

Object
ModelEditorGroupingHelper
See Also