This example demonstrates how to implement a search functionality like in Opera using the ButtonEditeditor.
To use this solution in your application, execute the following steps:
1. Drop the FindHelper component onto the target form.See also:
ButtonEdit
GridControl
How to highlight the next or previous search result in the treelist
This example demonstrates how to prevent creating detached connectors:
There are several scenarios when a user may create connector whose BeginItem/EndItem properties are empty:
1. Drawing a new connector using a tool. To cover this scenario, handle the AddingNewItem event and set e.Cancel to true if the BeginItem or EndItem properties are null:[C#]privatevoidDiagramDesignerControl_AddingNewItem(objectsender,DevExpress.Xpf.Diagram.DiagramAddingNewItemEventArgse){DiagramConnectorconnector=e.ItemasDiagramConnector;if(connector!=null){//...e.Cancel=connector.BeginItem==null||connector.EndItem==null;}}The standard approach (binding the GridControl and DataLayoutControl to the same collection) does not work in this scenario, because CurrencyManager does not manage Server Mode Data Sources. In addition, all Server Mode Data Sources except for XPServerCollectionSource are read-only.
This example demonstrates how to use the FocusedRowChanged event to synchronize the DataLayoutControl's data source (XPBindingSource or BindingSource) with a focused row.
Implementation details 1. Bind DataLayoutControl to a data source in the visual designer.[C#]privatevoidGridView_FocusedRowObjectChanged(objectsender,FocusedRowObjectChangedEventArgse){XPBindingSource.DataSource=Session.GetLoadedObjectByKey<ServerSideGridTest>(e.Row);}[VB.NET]PrivateSub GridView_FocusedRowObjectChanged(ByVal sender AsObject, ByVal e As FocusedRowObjectChangedEventArgs)
XPBindingSource.DataSource = Session.GetLoadedObjectByKey(Of ServerSideGridTest)(e.Row)EndSub[C#]privatevoidGridView_FocusedRowObjectChanged(objectsender,FocusedRowObjectChangedEventArgse){objectobj=DbContext.ServerSideGridTests.Single(e.Row);BindingSource.Clear();BindingSource.Add(obj);}[VB.NET]PrivateSub GridView_FocusedRowObjectChanged(ByVal sender AsObject, ByVal e As FocusedRowObjectChangedEventArgs)Dim obj AsObject = DbContext.ServerSideGridTests.Single(e.Row)
BindingSource.Clear()
BindingSource.Add(obj)EndSubFiles to look at:
• MainForm.cs (VB: MainForm.vb)This example is obsolete. We published a new version here: Server Mode - How to edit a focused GridView row in DataLayotControl.
This example demonstrates how to support report parameters of custom types for an End-User Report Designer for WinForms.
Do the following to enable this feature:
1. Create a custom report design extension inherited from the ReportDesignExtension class.
2. Override the ReportDesignExtension.AddParameterTypes method to register custom parameter types.
3. Register a custom extension using the ReportDesignExtension.RegisterExtension method.
Assign the required report to the created extension by calling the ReportDesignExtension.AssociateReportWithExtension method.
Unlike WinForms, where an embedded font can be registered globally using the PrivateFontCollection, WPF requires explicit reference to the embedded font. This sample application demonstrates how to work around this limitation.
See also:
E5198: How to use a private font (a custom font distributed with the application) in XtraReport
Note: This example targets the older version of our WPF report viewer called DocumentPreview. The new DocumentPreviewControl (v15.1+) does not use XAML for rendering document pages and therefore does not require any special handling with the exception of what's described in this MSDN article: How to: Create a Private Font Collection
Files to look at:
• MainWindow.xamlThis example describes how to conditinally disable row selection and selection checkboxes.
We recommend handling the selectionChanged event to prevent selecting disabled checkboxes. However, the Select All checkbox will work incorrectly after that. The cause of that issue is that dxDataGrid doesn't support this scenario out-of-the-box. A workaround for this scenario is shown in this GitHub repository. In this example, a row is disabled if its Approved value is false. The limitation of this workaround is that the remoteOperations option should be false.
Treemap colorizers uses item values (TreeMapItem.Value, TreeMapFlatDataAdapter.ValueDataMember, or HierarchicalDataMapping.ValueDataMember) to determine colors. You can use the TreeMapColorizerBase.ValueProvider property to specify a custom value source for a colorizer.
This example shows how to make the colorizer determine item colors based on the bound data source's "HPI" row values.
Use the WebChartControl.SelectedItemsChanged event to track changes in the collection of chart selected items.
In this example, the bar chart displays only points that correspond to the selected segments in the pie chart.
This example illustrates how to create a custom grid to customize the mechanism of filtering data via the auto filter row. For this, the GridView.CreateAutoFilterCriterion methodis overridden.
This example demonstrates how to filter DateTime values in columns via the auto filter row by using the additional "<", ">", ">=" and "<=" filter operands.
Files to look at:
• [Custom Grid.cs](https://github.com/DevExpress-Examples/custom-gridcontrol-how-to-implement-your-own-logic-for-filtering-data-in-an-auto-filter-row-e3148/blob/13.1.4%2B/CS/WindowsApplication3/Custom Grid.cs) (VB: [Custom Grid.vb](Custom Grid.cs](Custom Grid.cs](https://github.com/DevExpress-Examples/custom-gridcontrol-how-to-implement-your-own-logic-for-filtering-data-in-an-auto-filter-row-e3148/blob/13.1.4%2B/CS/WindowsApplication3/Custom Grid.cs) (VB: [Custom Grid.vb](Custom Grid.cs)This project demonstrates how to use the DevExpress custom drawing engine to render reports on Linux.
See the ASP.NET Core Reporting - Early Access Preview v20.1 - How to enable the Pango drawing engine Knowledge Base article for information on how to add this engine to your ASP.NET Core application.
File to look at: Program.cs
This example illustrates how to create custom HTML elements in DxDataGrid's command columns, specify icons for them and use the StartRowEdit method to initiate editing an existing row or adding a new row.
There are two projects:
1. MyTestWebServiceA sample project implementing a web API with ASP.NET Core.
ORM is EntityFrameworkCore.
The data base is "Northwind", and its backup is in this folder.
Restore the backup on your SQL server and change the connection string in this file correspondingly (see the OnConfiguring method).
DataGridWithWebApiServiceThis project uses the connection to the MyTestWebService web service. Deploy the MyTestWebService project, start it, and specify its address in this file
This example illustrates how to upload a new image using the DxUpload component, save it to the server's folder and save the path to the corresponding image in the edited grid's row.
This example shows how to use the PdfGraphics.AddLinkToUri method to add a hyperlink to a URI.
Files to look at:
• Program.cs (VB: Program.vb)This example shows how to print a document with custom printer settings.
The Universal Subscription or an additional Office File API Subscription is required to use this example in production code. Please refer to the DevExpress Subscription page for pricing information.
Files to look at:
• Program.cs (VB: Program.vb)This example is a ready-to-use client Angular application with the DevExpress RichEdit component. It demonstrates how to modify the built-in ribbon in the RichEdit control.
The ribbon option allows you to access RichEdit's built-in ribbon. You can get required tabs and items using the getTab and getItem methods respectively.
Then, you can add or remove items using the insertItem and removeItem methods.
Requirements • To use the RichEdit control in an Angular application, you need to have a Universal, DXperience, or ASP.NET subscription.Documentation: Add RichEdit to an Angular Application
npm installng serve --openDocumentation:
• Add RichEdit to an Angular ApplicationExamples:
• RichEdit Angular ApplicationXAF developers often create initial security roles via the administrative UI (at runtime) in non-production databases of their test environments. The visual approach is often faster than writing C# or VB.NET code manually, especially for complex permissions with criteria (check screenshots). If you create initial roles at runtime with test databases, you need to eventually transfer this data to production databases on customer sites.
SolutionModuleUpdater API and DBUpdater are standard means to seed initial data in databases with XAF.
We will demonstrate how to automatically create ModuleUpdater C# or VB.NET code for required roles created by XAF developers at runtime with test databases. XAF developers can easily copy and paste this ready code into their ModuleUpdater descendant and use the standard DBUpdater tool to seed data in production databases. We intentionally skip user creation code, because user names are often unknown at early stages and it is much easier to create and link users to predefined roles later in production environment.
Step 1. In the Solution Explorer, include RoleGenerator.csproj or RoleGenerator.vbproj into your XAF solution and then reference this RoleGenerator project from the YourSolutionName.Module one.
Step 2. Include the following files into your XAF solution projects
• YourSolutionName.Module: RoleGeneratorController.cs or RoleGeneratorController.vb;Step 3. Modify the YourSolutionName.Win/App.config and YourSolutionName.Web/Web.config files to add the EnableRoleGeneratorAction key under the appSettings section.
[XML]<appSettings>
...<addkey="EnableRoleGeneratorAction"value="True"/></appSettings>Step 4. Run the YourSolutionName.Win or YourSolutionName.Web project, select roles in the Role ListView, and click the Generate Role Action (in the WinForms project, this Action is under the Tools menu).
WinForms:
ASP.NET WebForms:
Step 5. Save the generated file and research its content. It contains code that creates initial roles based on data stored in your test database. To use this file in your XAF solution, consider one of these two strategies:
• Modify the existing YourSolutionName.Module/DatabaseUpdate/Updater.xx file based on theCreateUsersRole method code copied from the generated Updater.xx file.RoleUpdater class as follows:// C#
using System;
using DevExpress.ExpressApp;
using System.Collections.Generic;
using DevExpress.ExpressApp.Updating;
namespace YourSolutionName.Module {
public sealed partial class YourSolutionNameModule : ModuleBase {
public override IEnumerable<ModuleUpdater> GetModuleUpdaters(IObjectSpace objectSpace, Version versionFromDB) {
ModuleUpdater updater = new DatabaseUpdate.Updater(objectSpace, versionFromDB);
ModuleUpdater roleUpdater = new RoleUpdater(objectSpace, versionFromDB);
return new ModuleUpdater[] { updater, roleUpdater };
//...[VB.NET]' VB.NETImports SystemImports DevExpress.ExpressAppImports System.Collections.GenericImports DevExpress.ExpressApp.UpdatingNamespace YourSolutionName.Module {PublicNotInheritablePartialClass YourSolutionNameModuleInherits ModuleBasePublicOverridesFunction GetModuleUpdaters(ByVal objectSpace As IObjectSpace, ByVal versionFromDB As Version) As IEnumerable(Of ModuleUpdater)Dim updater As ModuleUpdater = New DatabaseUpdate.Updater(objectSpace, versionFromDB)Dim roleUpdater As ModuleUpdater = New DatabaseUpdate.RoleUpdater(objectSpace, versionFromDB)ReturnNew ModuleUpdater() {updater, roleUpdater}EndFunction'...If you have a custom security role class (for instance, ExtendedSecurityRole as in these examples: one, two) and this class has custom properties, you need to include these properties into the generated code. To do this, handle the RoleGenerator.CustomizeCodeLines event in the RoleGeneratorController class added at Step 2:
// C#
using System.Collections.Generic;
using System.Linq;
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Actions;
using DevExpress.Persistent.Base;
using RoleGeneratorSpace;
namespace XafSolution.Module.Controllers {
public abstract class RoleGeneratorController : ViewController<ListView> {
//...
protected void RoleGeneratorAction_Execute(object sender, SimpleActionExecuteEventArgs e) {
RoleGenerator roleGenerator = new RoleGenerator(roleType);
roleGenerator.CustomizeCodeLines += RoleGenerator_CustomizeCodeLines;
IEnumerable<IPermissionPolicyRole> roleList = e.SelectedObjects.OfType<IPermissionPolicyRole>();
string updaterCode = roleGenerator.GetUpdaterCode(roleList);
SaveFile(updaterCode);
}
private void RoleGenerator_CustomizeCodeLines(object sender, CustomizeCodeLinesEventArg e) {
ExtendedSecurityRole exRole = e.Role as ExtendedSecurityRole;
if(exRole != null) {
e.CustomCodeLines.Add(string.Format("role.CanExport = {0};", exRole.CanExport.ToString().ToLowerInvariant()));
}
}
}
}[VB.NET]' VB.NETImports SystemImports System.Collections.GenericImports System.ComponentModelImports System.LinqImports DevExpress.ExpressAppImports DevExpress.ExpressApp.ActionsImports DevExpress.ExpressApp.SecurityImports DevExpress.Persistent.BaseImports RoleGeneratorSpaceImports XafSolution.SecurityNamespace XafSolution.Module.ControllersPublicMustInheritClass RoleGeneratorControllerInherits ViewController(Of ListView)'...ProtectedSub RoleGeneratorAction_Execute(ByVal sender AsObject, ByVal e As SimpleActionExecuteEventArgs) Handles roleGeneratorAction.ExecuteDim roleGenerator AsNew RoleGenerator(roleType)AddHandler roleGenerator.CustomizeCodeLines, AddressOf RoleGenerator_CustomizeCodeLinesDim roleList As IEnumerable(Of IPermissionPolicyRole) = e.SelectedObjects.OfType(Of IPermissionPolicyRole)()Dim updaterCode AsString = roleGenerator.GetUpdaterCode(roleList)
SaveFile(updaterCode)EndSubPrivateSub RoleGenerator_CustomizeCodeLines(ByVal sender AsObject, ByVal e As CustomizeCodeLinesEventArg)Dim exRole As ExtendedSecurityRoleTS = TryCast(e.Role, ExtendedSecurityRoleTS)If exRole IsNot NothingThen
e.CustomCodeLines.Add(String.Format("role.CanExport = {0}", exRole.CanExport))EndIfEndSubEndClassEndNamespace'...This example illustrates how to programmatically generate the SQL-script for database schema migration with eXpress Persistent Objects.
Files to look at:
• Program.cs (VB: Program.vb)This example illustrates how to:
• Replace the default filter row editor for a TokenBox column with the MVCxTokenBox control;Files to look at:
• HomeController.cs(VB: HomeController.vb)