DevExpress-Examples · LanaDX · Mar 21, 2025 · Mar 21, 2025 · Mar 21, 2025 · Mar 21, 2025
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+*       @DevExpressExampleBot
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-*Files to look at*:
-* [MySearchClass.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/BusinessObjects/MySearchClass.cs)
-* [Model.DesignedDiffs.xafml](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Model.DesignedDiffs.xafml)
-* [MySearchController.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Controllers/MySearchController.cs)
-* [MyShowSearchController.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Controllers/MyShowSearchController.cs)
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+
+
 # How to search for XAF objects using a complex criterion
 
+This example creates a pop-up window that allows users to perform a custom object search.
+
+![MySearchClass window](my-search-class-window.png)
+
+## Implementation Details
 
-To accomplish this task, take the following steps:
+1. Create a [non-persistent](https://docs.devexpress.com/eXpressAppFramework/116516/business-model-design-orm/non-persistent-objects) class with properties used to search persistent objects.  
+    _File to review: [MySearchClass.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/BusinessObjects/MySearchClass.cs)_
+    ```cs
+    [DomainComponent]
+    public class MySearchClass : NonPersistentBaseObject {
+        [XafDisplayName("FirstName contains:")]
+        public string FirstName { get; set; }
+        [XafDisplayName("Age is equal to:")]
+        public int Age { get; set; }
+        // ...
+    }
+    ```
 
+2. Add a collection of persistent objects that contains the search results.  
+     _File to review: [MySearchClass.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/BusinessObjects/MySearchClass.cs)_
+    ```cs
+    [DomainComponent]
+    public class MySearchClass : NonPersistentBaseObject {
+        // ...
+        private IList<Contact> _contacts = new List<Contact>();
+        [XafDisplayName("Results:")]
+        public IList<Contact> Contacts {
+            get {
+                return _contacts;
+            }
+        }
+    }
+    ```
 
-1. Create a [non-persistent](https://docs.devexpress.com/eXpressAppFramework/116516/business-model-design-orm/non-persistent-objects) class with properties that we will use to find persistent objects: [MySearchClass.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/BusinessObjects/MySearchClass.cs)
-2. In this class add a collection of persistent objects as described at [How to: Show Persistent Objects in a Non-Persistent Object's View](https://docs.devexpress.com/eXpressAppFramework/116106/business-model-design-orm/non-persistent-objects/how-to-show-persistent-objects-in-a-non-persistent-objects-view#persistent-collection). This collection will show the search results.
-3. In this class' non-persistent detail  view, add a custom 'Search' action as described at [How to: Include an Action to a Detail View Layout](https://docs.devexpress.com/eXpressAppFramework/112816/task-based-help/miscellaneous-ui-customizations/how-to-include-an-action-to-a-detail-view-layout)
-4. When a user presses this 'Search' action, create a criterion based on the properties from point 1 and get persistent objects that fit this criterion as described at the 'Get a collection' section of [Create, Read, Update and Delete Data](https://docs.devexpress.com/eXpressAppFramework/113711/concepts/data-manipulation-and-business-logic/create-read-update-and-delete-data): [MySearchController.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Controllers/MySearchController.cs)
-5. To show this non-persistent class view, use the solution from [Ways to Show a View](https://docs.devexpress.com/eXpressAppFramework/112803/ui-construction/views/ways-to-show-a-view/ways-to-show-a-view): [MyShowSearchController.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Controllers/MyShowSearchController.cs)
+3. Add the **MySearch** action that populates the collection.
+     _File to review: [MySearchController.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Controllers/MySearchController.cs)_
+    ```cs
+    public class MySearchController : ObjectViewController<DetailView, MySearchClass> {
+        public MySearchController() {
+            var myAction1 = new SimpleAction(this, "MySearch", "MySearchCategory");
+            myAction1.Execute += MyAction1_Execute;
+        }
+        // ...
+    }
+    ```
+
+4. When a user clicks the **MySearch** action, create a criterion based on the properties described in the first step and get persistent objects that fit this criterion.  
+     _File to review: [MySearchController.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Controllers/MySearchController.cs)_
+    ```cs
+    public class MySearchController : ObjectViewController<DetailView, MySearchClass> {
+        // ...
+        private void MyAction1_Execute(object sender, SimpleActionExecuteEventArgs e) {
+            var mySearchObject = (MySearchClass)View.CurrentObject;
+            var persistentOS = Application.CreateObjectSpace(typeof(Contact));
+            var criterion = CriteriaOperator.FromLambda<Contact>(x => x.FirstName.Contains(mySearchObject.FirstName) || x.Age == mySearchObject.Age);
+            var results = persistentOS.GetObjects<Contact>(criterion);
+            mySearchObject.SetContacts(results);
+        }
+    }
+    ```
+
+5. Create the **MyShowSearchAction** to display the **MySearchClass** detail view from the **Contact** list view in a pop-up window.
+     _File to review: [MyShowSearchController.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Controllers/MyShowSearchController.cs)_
+    ```cs
+    public class MyShowSearchController : ObjectViewController<ListView, Contact> {
+        public MyShowSearchController() {
+            var mypopAction1 = new PopupWindowShowAction(this, "MyShowSearchAction", PredefinedCategory.Edit);
+            mypopAction1.TargetViewNesting = Nesting.Root;
+            mypopAction1.CustomizePopupWindowParams += MyAction1_CustomizePopupWindowParams;
+        }
+        private void MyAction1_CustomizePopupWindowParams(object sender, CustomizePopupWindowParamsEventArgs e) {
+            var nonPersistentOS = (NonPersistentObjectSpace)Application.CreateObjectSpace(typeof(MySearchClass));
+            var persistentOS = Application.CreateObjectSpace(typeof(Contact));
+            nonPersistentOS.AdditionalObjectSpaces.Add(persistentOS);
+            var obj = nonPersistentOS.CreateObject<MySearchClass>();
+            nonPersistentOS.CommitChanges();
+            var view = Application.CreateDetailView(nonPersistentOS, obj);
+            e.View = view;
+        }
+    }
+    ```
+
+
+## Files to Review
+* [MySearchClass.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/BusinessObjects/MySearchClass.cs)
+* [Model.DesignedDiffs.xafml](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Model.DesignedDiffs.xafml)
+* [MySearchController.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Controllers/MySearchController.cs)
+* [MyShowSearchController.cs](CS/EFCore/ComplexSearchEF/ComplexSearchEF.Module/Controllers/MyShowSearchController.cs)
 
-![image](https://github.com/DevExpress-Examples/XAF_how-to-search-for-objects-by-using-all-the-properties-or-by-using-more-complex-criteria-e1744/assets/14300209/c5b8ac4b-9e88-4f29-99cd-b2a0bdf64890)
+## Documentation
 
+- [Non-Persistent classes](https://docs.devexpress.com/eXpressAppFramework/116516/business-model-design-orm/non-persistent-objects)
+- [How to: Show Persistent Objects in a Non-Persistent Object's View](https://docs.devexpress.com/eXpressAppFramework/116106/business-model-design-orm/non-persistent-objects/how-to-show-persistent-objects-in-a-non-persistent-objects-view#persistent-collection)
+- [How to: Include an Action to a Detail View Layout](https://docs.devexpress.com/eXpressAppFramework/112816/task-based-help/miscellaneous-ui-customizations/how-to-include-an-action-to-a-detail-view-layout)
+- [Create, Read, Update and Delete Data](https://docs.devexpress.com/eXpressAppFramework/113711/data-manipulation-and-business-logic/create-read-update-and-delete-data)
+- [Ways to Show a View](https://docs.devexpress.com/eXpressAppFramework/112803/ui-construction/views/ways-to-show-a-view/ways-to-show-a-view)
 
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