 | DelayedSeries Class |
This type exposes a single static method `DelayedSeries.Create` that can be used for
constructing data series (of type `Series<K, V>`) with lazily loaded data. You can
use this functionality to create series that represents e.g. an entire price history
in a database, but only loads data that are actually needed. For more information
see the [lazy data loading tutorial](../lazysource.html).
## Example
Assuming we have a function `generate lo hi` that generates data in the specified
`DateTime` range, we can create lazy series as follows:
let ls = DelayedSeries.Create(min, max, fun (lo, lob) (hi, hib) ->
async {
printfn "Query: %A - %A" (lo, lob) (hi, hib)
return generate lo hi })
The arguments `min` and `max` specfify the complete range of the series. The
function passed to `Create` is called with minimal and maximal required key
(`lo` and `hi`) and with two values that specify boundary behaviour.
[category:Specialized frame and series types]
Inheritance HierarchyNamespace: Deedle
Assembly: Deedle (in Deedle.dll) Version: 1.2
SyntaxC#
[SerializableAttribute] public class DelayedSeries
The DelayedSeries type exposes the following members.
Methods| Name | Description | |
|---|---|---|
  | Createa, b(a, a, FSharpFuncTuplea, BoundaryBehavior, FSharpFuncTuplea, BoundaryBehavior, FSharpAsyncIEnumerableKeyValuePaira, b) | Obsolete. |
| Createa, b(a, a, Funca, BoundaryBehavior, a, BoundaryBehavior, TaskIEnumerableKeyValuePaira, b) | Obsolete. |
| Equals | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
 | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
| FromIndexVectorLoaderK, V(AddressingIAddressingScheme, IVectorBuilder, IIndexBuilder, K, K, FSharpFuncTupleK, BoundaryBehavior, FSharpFuncTupleK, BoundaryBehavior, FSharpAsyncTupleIIndexK, IVectorV) | |
| FromIndexVectorLoaderK, V(AddressingIAddressingScheme, IVectorBuilder, IIndexBuilder, K, K, FuncK, BoundaryBehavior, K, BoundaryBehavior, TaskTupleIIndexK, IVectorV) | |
| FromValueLoaderK, V(K, K, FSharpFuncTupleK, BoundaryBehavior, FSharpFuncTupleK, BoundaryBehavior, FSharpAsyncIEnumerableKeyValuePairK, V) |
An F#-friendly function that creates lazily loaded series. The method requires
the overall range of the series (smallest and greatest key) and a function that
loads the data. The function is called with two tuples that specify lower and upper
boundary. It returns an asynchronous workflow that produces the data.
## Parameters
- `min` - The smallest key that should be present in the created series.
- `min` - The greatests key that should be present in the created series.
- `loader` - A function which returns an asynchronous workflow that loads the data in a
specified range. The function is called with two tuples consisting of key and
`BoundaryBehavior` values. The keys specify lower and upper boundary and
`BoundaryBehavior` values can be either `Inclusive` or `Exclusive`.
## Remarks
For more information see the [lazy data loading tutorial](../lazysource.html).
|
| FromValueLoaderK, V(K, K, FuncK, BoundaryBehavior, K, BoundaryBehavior, TaskIEnumerableKeyValuePairK, V) |
A C#-friendly function that creates lazily loaded series. The method requires
the overall range of the series (smallest and greatest key) and a function that
loads the data. In this overload, the function is a `Func` delegate taking
information about the requested range and returning `Task<T>` that produces the data.
## Parameters
- `min` - The smallest key that should be present in the created series.
- `min` - The greatests key that should be present in the created series.
- `loader` - A delegate which returns a task that loads the data in a specified
range. The delegate is called with four arguments specifying the minimal and
maximal key and two `BoundaryBehavior` values specifying whether the low and
high ranges are inclusive or exclusive.
## Remarks
For more information see the [lazy data loading tutorial](../lazysource.html).
The operation calls `loader` (and so creates the tasks) on the thread that is
requesting the result.
|
| GetHashCode | Serves as the default hash function. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
See Also