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ObservableAsync.CountAsync(IObservableAsync, Func?) method¶
Defined in
Type: ObservableAsync
Namespace: ReactiveUI.Extensions.Async
Assembly: ReactiveUI.Extensions.dll
Applies to
net10.0, net10.0-browserwasm1.0, net10.0-desktop1.0, net9.0, net9.0-browserwasm1.0, net9.0-desktop1.0, net8.0, net8.0-ios17.5, net8.0-maccatalyst17.5, net8.0-macos14.2, net8.0-macos14.5, net8.0-tvos17.2, netstandard2.1, net462, net481
Overloads¶
- 1.
public static ValueTask<int> CountAsync<T>(this IObservableAsync<T> @this, Func<T, bool>? predicate) - 2.
public static ValueTask<int> CountAsync<T>(this IObservableAsync<T> @this, Func<T, bool>? predicate, CancellationToken cancellationToken) - 3.
public static ValueTask<int> CountAsync<T>(this IObservableAsync<T> @this) - 4.
public static ValueTask<int> CountAsync<T>(this IObservableAsync<T> @this, CancellationToken cancellationToken)
1. Overload¶
public static ValueTask<int> CountAsync<T>(this IObservableAsync<T> @this, Func<T, bool>? predicate)
Summary: Asynchronously counts the number of elements that satisfy a specified condition.
Type parameters
| Name | Description |
|---|---|
T | The type of elements in the source sequence. |
Parameters
| Name | Type | Description |
|---|---|---|
this | [IObservableAsync | The source observable sequence. |
predicate | Func | A function to test each element for a condition. If null, all elements are counted. |
Returns: ValueTask
2. Overload¶
public static ValueTask<int> CountAsync<T>(this IObservableAsync<T> @this, Func<T, bool>? predicate, CancellationToken cancellationToken)
Summary: Asynchronously counts the number of elements that satisfy a specified condition.
Type parameters
| Name | Description |
|---|---|
T | The type of elements in the source sequence. |
Parameters
| Name | Type | Description |
|---|---|---|
this | [IObservableAsync | The source observable sequence. |
predicate | Func | A function to test each element for a condition. If null, all elements are counted. |
cancellationToken | CancellationToken | A cancellation token that can be used to cancel the asynchronous operation. |
Returns: ValueTask
3. Overload¶
public static ValueTask<int> CountAsync<T>(this IObservableAsync<T> @this)
Summary: Asynchronously returns the total number of elements in the data source.
Type parameters
| Name | Description |
|---|---|
T | The type of elements in the source sequence. |
Parameters
| Name | Type | Description |
|---|---|---|
this | [IObservableAsync | The source observable sequence. |
Returns: ValueTask
4. Overload¶
public static ValueTask<int> CountAsync<T>(this IObservableAsync<T> @this, CancellationToken cancellationToken)
Summary: Asynchronously returns the total number of elements in the data source.
Type parameters
| Name | Description |
|---|---|
T | The type of elements in the source sequence. |
Parameters
| Name | Type | Description |
|---|---|---|
this | [IObservableAsync | The source observable sequence. |
cancellationToken | CancellationToken | A cancellation token that can be used to cancel the asynchronous count operation. |
Returns: ValueTask