DxReportViewer.OnCustomizeParameters Event

Allows you to specify custom editors for report parameters.

Namespace: DevExpress.Blazor.Reporting

Assembly: DevExpress.Blazor.Reporting.v21.2.Viewer.dll

NuGet Package: DevExpress.Blazor.Reporting.Viewer

Declaration

C#

[Parameter]
public EventCallback<ParametersModel> OnCustomizeParameters { get; set; }

VB.NET

<Parameter>
Public Property OnCustomizeParameters As EventCallback(Of ParametersModel)

Parameters

Type	Description
ParametersModel	An object that contains report parameters and allows you to manage them.

Remarks

Handle the OnCustomizeParameters event to modify parameter settings and specify custom parameter editors.

Example: Customize Parameter Editor with Template

1. Implement a custom editor as a razor component. The following code is the CustomInt.razor file that contains an editor based on the DxSpinEdit<T> component for integer values in the range 0-10:

   <DxSpinEdit @bind-Value="@EditorValue" MinValue="0" MaxValue="10"></DxSpinEdit>
   
   @code {
       Int32 EditorValue
       {
           get { return (Int32)Value; }
           set { Value = value; ValueChanged.InvokeAsync(value); }
       }
       [Parameter] public object Value { get; set; }
       [Parameter] public EventCallback<object> ValueChanged { get; set; }
   }
   

2. Handle the OnCustomizeParameters event and specify the CustomInt component as the editor’s template:

   <DxReportViewer @ref="reportViewer" OnCustomizeParameters="OnCustomizeParameters">
   </DxReportViewer>
   
   @code {
       DxReportViewer reportViewer;
   
       void OnCustomizeParameters(ParametersModel parametersModel)
       {
           foreach (var parameter in parametersModel.VisibleItems)
           {
               if (parameter.Type == typeof(int))
               {
                   parameter.ValueTemplate = GetIntEditorTemplate(parameter);
               }
           }
       }
   
       RenderFragment GetIntEditorTemplate(ParameterModel paramModel)
       {
           return @<CustomInt @bind-value="@paramModel.Value"></CustomInt>;
       }
   }
   

Example: Stand-Alone Parameter Editor

You can bind the ParameterModel to an editor on the page. Review the following example:

View Example: Stand-Alone Parameter Editor