Create and Register a Custom Control in the Report Designer Toolbox (Blazor)

• Aug 18, 2023
• 3 minutes to read

This topic explains how to create a custom report control inherited from the XRLabel control and register the control in the End-User Report Designer Toolbox .

View Example: Blazor Reporting (JavaScript-Based) - UI Customization API

Create a Custom Control

Add a new class that inherits from the XRLabel class and declare its properties with relevant attributes. Override the PutStateToBrick method to specify how to display a control in the preview. In this example, a value is assigned to the VisualBrick.Text property:

NumericLabel.cs

using DevExpress.Utils.Serializing;
using DevExpress.XtraPrinting;
using DevExpress.XtraReports.UI;
using System.ComponentModel;

public class NumericLabel : XRLabel
{
    [Browsable(true), Bindable(false), Category("Data")]
    [XtraSerializableProperty]
    [DefaultValue("")]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible),
    EditorBrowsable(EditorBrowsableState.Always)]
    public int Number { get; set; }

    // Render the control in the Designer's Preview and in the document.
    protected override void PutStateToBrick(VisualBrick brick, PrintingSystemBase ps)
    {
        base.PutStateToBrick(brick, ps);
        brick.Text = this.Number.ToString();
    }
}

MyControl.cs

using DevExpress.Utils.Serializing;
using DevExpress.XtraPrinting;
using DevExpress.XtraReports.Localization;
using DevExpress.XtraReports;
using DevExpress.XtraReports.UI;
using System.ComponentModel;
using System.Drawing;

public enum MyEnum { One, Two, Three }

public class MyControl : XRLabel {
    public static readonly SizeF InitSizeF = new SizeF(200, 50);

    [XtraSerializableProperty,
    DefaultValue(true),
    Favorite(true),
    SRCategory(ReportStringId.CatBehavior)]
    public bool BoolProp { get; set; }

    [XtraSerializableProperty,
    DefaultValue(MyEnum.One)]
    public MyEnum EnumProp { get; set; }

    [XtraSerializableProperty]
    public Item[] ArrayProp { get; set; }

    protected override void PutStateToBrick(VisualBrick brick, PrintingSystemBase ps) {
        base.PutStateToBrick(brick, ps);
        brick.Text = EnumProp.ToString();
    }

    public class Item {
        [XtraSerializableProperty]
        public int PropA { get; set; }
    }
}

Limitations

• The Visual Studio Report Designer does not display a custom control in the Toolbox.
• Reporting for Web does not support custom XRTableRow and XRTableCell control implementations in a custom XRTable control.

Register a Custom Control in the Web End-User Report Designer

To add a custom control to the Report Designer toolbox, register custom control type using the DxReportDesigner.CustomControlTypes property.

The default icon for a custom control is the question mark. To specify a custom icon, add a style template with a name that is based on the name of the custom control’s class and uses the following pattern:

.dxrd-image-<namespace in lowercase>_<class name in lowercase>

The following code snippet registers the MyControl and NumericLabel custom control types, and specifies an SVG icon for the NumericLabel control:

DesignerCustomControls.razor

@page "/designercustomcontrols"

<h1>End-User Report Designer - Custom Controls</h1>
<ul>
    <li>Custom report control `MyControl` added to the toolbox</li>
    <li>Custom report control `NumericLabel` added to the toolbox</li>
</ul>


<DxReportDesigner ReportName="SampleReport" Height="1000px" Width="100%" CustomControlTypes="@customTypes">
</DxReportDesigner>


@code {
    List<Type> customTypes = new List<Type> { typeof(MyControl), typeof(NumericLabel) };
}

_Host.cshtml

<script type="text/html" id="dxrd-svg-toolbox-numericlabel">
    <svg viewBox="-2 -4 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
        <g id="Layer_1" transform="translate(-2, -4)" style="enable-background:new 0 0 32 32">
            <g id="Window">
                <path d="M30, 10L30, 5C30, 4.5 29.5, 4 29, 4L3, 4C2.5, 4 2, 4.5 2, 5L2, 10L30, 10z" fill="#1177D7" class="Blue" />
            </g>
        </g>
        <g id="Layer_1" transform="translate(-2, -4.00000095367432)" style="enable-background:new 0 0 32 32">
            <g id="Window">
                <path d="M28, 10L28, 26L4, 26L4, 10L2, 10L2, 27C2, 27.5 2.5, 28 3, 28L29, 28C29.5, 28 30, 27.5 30, 27L30, 10L28, 10z" fill="#727272" class="Black" />
            </g>
        </g>
    </svg>
</script>