SubDocument.GetRtfAsync(Int32, Int32, CancellationToken) Method

Returns the interval content in Rich Text Format (RTF). The startPosition and length parameters define the interval.

Namespace: DevExpress.Blazor.RichEdit

Assembly: DevExpress.Blazor.RichEdit.v25.1.dll

NuGet Package: DevExpress.Blazor.RichEdit

Declaration

public ValueTask<string> GetRtfAsync(
    int startPosition,
    int length,
    CancellationToken cancellationToken = default(CancellationToken)
)

Parameters

Name	Type	Description
startPosition	Int32	The interval’s start position.
length	Int32	The interval’s length.

Optional Parameters

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

Returns

Type	Description
ValueTask<String>	A structure that stores an awaitable result of an asynchronous operation. The awaitable result is an RTF text string.

Remarks

The following code snippet performs the following steps:

1. Calls the GetHeaderAsync(HeaderFooterType, Boolean, CancellationToken) method to access a sub-document’s header.
2. Calls the GetRtfAsync method to get the first ten letters of the header text.
3. Saves the obtained text to the header.rtf file.

<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);
            string headerContent = await header.GetRtfAsync(0,10);
            await File.WriteAllTextAsync(pathRtf, headerContent);
        }
        await base.OnAfterRenderAsync(firstRender);
    }
}

To get RTF text from an interval specified by an Interval object, use the GetRtfAsync(Interval, CancellationToken) method.