Method While
While<TSource>(Func<bool>, IAsyncEnumerable<TSource>)
Generates an enumerable sequence by repeating a source sequence as long as the given loop condition holds.
Declaration
public static IAsyncEnumerable<TSource> While<TSource>(Func<bool> condition, IAsyncEnumerable<TSource> source)Parameters
| Type | Name | Description |
|---|---|---|
| Func<bool> | condition | Loop condition. |
| IAsyncEnumerable<TSource> | source | Sequence to repeat while the condition evaluates true. |
Returns
| Type | Description |
|---|---|
| IAsyncEnumerable<TSource> | Sequence generated by repeating the given sequence while the condition evaluates to true. |
Type Parameters
| Name | Description |
|---|---|
| TSource | Source sequence element type. |
Remarks
condition is evaluated lazily, once at the start of each loop of source.
source is cached via Memoize<TSource>(IAsyncEnumerable<TSource>), so that it
is only iterated once during the first loop. Successive loops will enumerate the cache instead of source.
Exceptions
| Type | Condition |
|---|---|
| ArgumentNullException |
|
While<TSource>(Func<ValueTask<bool>>, IAsyncEnumerable<TSource>)
Generates an enumerable sequence by repeating a source sequence as long as the given loop condition holds.
Declaration
public static IAsyncEnumerable<TSource> While<TSource>(Func<ValueTask<bool>> condition, IAsyncEnumerable<TSource> source)Parameters
| Type | Name | Description |
|---|---|---|
| Func<ValueTask<bool>> | condition | Loop condition. |
| IAsyncEnumerable<TSource> | source | Sequence to repeat while the condition evaluates true. |
Returns
| Type | Description |
|---|---|
| IAsyncEnumerable<TSource> | Sequence generated by repeating the given sequence while the condition evaluates to true. |
Type Parameters
| Name | Description |
|---|---|
| TSource | Source sequence element type. |
Remarks
condition is evaluated lazily, once at the start of each loop of source.
source is cached via Memoize<TSource>(IAsyncEnumerable<TSource>), so that it
is only iterated once during the first loop. Successive loops will enumerate the cache instead of source.
Exceptions
| Type | Condition |
|---|---|
| ArgumentNullException |
|