Fields.CreateAsync(Interval, CancellationToken) Method

Creates a field in the specified interval.

Namespace: DevExpress.Blazor.RichEdit

Assembly: DevExpress.Blazor.RichEdit.v23.2.dll

NuGet Package: DevExpress.Blazor.RichEdit

Declaration

public ValueTask<Field> CreateAsync(
    Interval interval,
    CancellationToken cancellationToken = default(CancellationToken)
)

Parameters

Name	Type	Description
interval	Interval	The interval where to create the field.

Optional Parameters

Name	Type	Default	Description
cancellationToken	CancellationToken	null	An object that propagates a cancellation notification.

Returns

Type	Description
ValueTask<Field>	A structure that stores an awaitable result of an asynchronous operation. The awaitable result is a field object.

Remarks

Call the CreateAsync(Interval) method to wrap the specified interval in a new field.

The following example shows how to create a PAGE field in a header:

<DxRichEdit @ref="@richEdit" />

@code {
    DxRichEdit richEdit;
    Document documentAPI;
    @* ... *@
    /* 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 {
            documentAPI = richEdit.DocumentAPI;
            @* ... *@
            // Accesses a header
            Section section = await documentAPI.Sections.GetAsync(0);
            SubDocument header = await section.GetHeaderAsync(HeaderFooterType.Primary, true);
            // Inserts the "PAGE" text in the header
            TextSpan pageNumber = await header.AddTextAsync("PAGE");
            // Creates a PAGE field
            Field pageField = await header.Fields.CreateAsync(pageNumber.Interval);
            // Updates the field
            await header.Fields.UpdateAsync(pageField);
            @* ... *@
        }
        catch (OperationCanceledException e) {
            Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}");
        }
}

Update a field to calculate and display the field result. The UpdateAsync(Field, CancellationToken) method allows you to update a field. Call the UpdateAllAsync(Boolean, CancellationToken) method to update every field in a sub-document or in all sub-documents.