blazor-devexpress-dot-blazor-dot-richedit-dot-fields-dot-createasync-x28-system-dot-int32-system-dot-int32-x29.md
Creates a field in an interval. The interval is specified with the startPosition and length parameters.
Namespace : DevExpress.Blazor.RichEdit
Assembly : DevExpress.Blazor.RichEdit.v25.2.dll
NuGet Package : DevExpress.Blazor.RichEdit
public ValueTask<Field> CreateAsync(
int startPosition,
int length
)
| Name | Type | Description |
|---|---|---|
| startPosition | Int32 |
The interval’s start position.
| | length | Int32 |
The interval’s length.
|
| Type | Description |
|---|---|
| ValueTask<Field> |
A structure that stores an awaitable result of an asynchronous operation. The awaitable result is a field object.
|
The startPosition and the length parameters specify an interval in a sub-document. Call the CreateAsync(Int32, Int32) method to wrap the specified interval in a new field.
The following example shows how you can create a TIME field at the beginning of the main sub-document:
<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;
@* ... *@
// Creates an empty field
Field timeField = await documentAPI.Fields.CreateAsync(0, 0);
// Inserts text to the field
await documentAPI.AddTextAsync(1, "TIME");
// Updates the field
await documentAPI.Fields.UpdateAsync(timeField);
@* ... *@
}
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.
See Also