SubDocument.GetIntervalAsync(CancellationToken) Method

Returns a sub-document’s interval.

Namespace : DevExpress.Blazor.RichEdit

Assembly : DevExpress.Blazor.RichEdit.v25.2.dll

NuGet Package : DevExpress.Blazor.RichEdit

Declaration

csharp

public ValueTask<Interval> GetIntervalAsync(
    CancellationToken cancellationToken = default(CancellationToken)
)

Optional Parameters

Name	Type	Default	Description
cancellationToken	CancellationToken	null

An object that propagates a cancellation notification.

Returns

Type	Description
ValueTask<Interval>

A structure that stores an awaitable result of an asynchronous operation. The awaitable result is the returned interval.

Remarks

The following code snippet performs the following steps:

Calls the GetIntervalAsync method to access a sub-document’s interval. This interval corresponds to the document header.
Passes the returned interval to the GetRtfAsync(Interval, CancellationToken) method to get the header’s RTF text.
Saves the obtained text to the header.rtf file.

razor

<DxRichEdit @ref="@richEdit" />

@code {
    DxRichEdit richEdit { get; set; }
    string pathRtf { get; set; } = @"C:\Temp\header.rtf";

    protected async override Task OnAfterRenderAsync(bool firstRender) {
        if (firstRender) {
            Section section = await richEdit.DocumentAPI.Sections.GetAsync(0);
            SubDocument header = await section.GetHeaderAsync(HeaderFooterType.Primary, true);
            Interval interval = await header.GetIntervalAsync();
            string headerContent = await header.GetRtfAsync(interval);
            await File.WriteAllTextAsync(pathRtf, headerContent);
        }
        await base.OnAfterRenderAsync(firstRender);
    }
}