CalculateDocumentVariableEventArgs Class

Provides data for the CalculateDocumentVariable event.

Namespace: DevExpress.Blazor.RichEdit

Assembly: DevExpress.Blazor.RichEdit.v24.2.dll

NuGet Package: DevExpress.Blazor.RichEdit

Declaration

public class CalculateDocumentVariableEventArgs :
    EventArgs

Related API Members

CalculateDocumentVariableEventArgs is the data class for the following events:

• DxRichEdit.CalculateDocumentVariable

Remarks

Handle the CalculateDocumentVariable event to calculate a value of the DOCVARIABLE field. The VariableName event argument’s property identifies the processed field. Set the Value property to the field result value.

<DxRichEdit  @bind-Selection="@selection" @ref="@richEdit" 
    CalculateDocumentVariable="@(async x => await OnCalculateDocumentVariable(x))" />

@code {
    DxRichEdit richEdit { get; set; }
    Selection selection { get; set; }
    protected override Task OnAfterRenderAsync(bool firstRender) {
        if (firstRender)
            InitializeDocument();
        return base.OnAfterRenderAsync(firstRender);
    }

    async void InitializeDocument() {
    /* Surround the code that contains an asynchronous operation with a try-catch block to handle
    the OperationCanceledException. This exception is thrown when an asynchronous operation is canceled. */
        try {
            await richEdit.DocumentAPI.Fields.CreateAsync(richEdit.Selection.CaretPosition, "DOCVARIABLE paragraphCount");
            await richEdit.DocumentAPI.AddTextAsync("Number of paragraphs: ");
        }
        catch (OperationCanceledException e) {
            Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}");
        }
    }
    async Task OnCalculateDocumentVariable(CalculateDocumentVariableEventArgs eventArgs) {
        try {
            switch (eventArgs.VariableName) {
                case "paragraphCount":
                    var paragraphs = await richEdit.DocumentAPI.Paragraphs.GetAllAsync();
                    eventArgs.Value = paragraphs.Count.ToString();
                    break;
                default:
                    break;
            }
        }
        catch (OperationCanceledException e) {
            Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}");
        }
    }
}

Inheritance

Object

EventArgs

CalculateDocumentVariableEventArgs