)} )} )} )} )} })} })} })} })} })} ,System.Func{--0,System.Double})} ,System.Func{--0,System.Single})} ,System.Func{--0,System.Decimal})} ,System.Func{--0,System.Int32})} ,System.Func{--0,System.Int64})} ,System.Func{--0,System.Nullable{System.Double}})} ,System.Func{--0,System.Nullable{System.Single}})} ,System.Func{--0,System.Nullable{System.Decimal}})} ,System.Func{--0,System.Nullable{System.Int32}})} ,System.Func{--0,System.Nullable{System.Int64}})}

Observable.Sum(IObservable) method¶

Defined in

Type: Observable Namespace: System.Reactive.Linq Assembly: System.Reactive.dll

Applies to

netstandard2.0

Overloads¶

1. public static IObservable<double> Sum(this IObservable<double> source)
2. public static IObservable<float> Sum(this IObservable<float> source)
3. public static IObservable<decimal> Sum(this IObservable<decimal> source)
4. public static IObservable<int> Sum(this IObservable<int> source)
5. public static IObservable<long> Sum(this IObservable<long> source)
6. public static IObservable<double?> Sum(this IObservable<double?> source)
7. public static IObservable<float?> Sum(this IObservable<float?> source)
8. public static IObservable<decimal?> Sum(this IObservable<decimal?> source)
9. public static IObservable<int?> Sum(this IObservable<int?> source)
10. public static IObservable<long?> Sum(this IObservable<long?> source)
11. public static IObservable<double> Sum<TSource>(this IObservable<TSource> source, Func<TSource, double> selector)
12. public static IObservable<float> Sum<TSource>(this IObservable<TSource> source, Func<TSource, float> selector)
13. public static IObservable<decimal> Sum<TSource>(this IObservable<TSource> source, Func<TSource, decimal> selector)
14. public static IObservable<int> Sum<TSource>(this IObservable<TSource> source, Func<TSource, int> selector)
15. public static IObservable<long> Sum<TSource>(this IObservable<TSource> source, Func<TSource, long> selector)
16. public static IObservable<double?> Sum<TSource>(this IObservable<TSource> source, Func<TSource, double?> selector)
17. public static IObservable<float?> Sum<TSource>(this IObservable<TSource> source, Func<TSource, float?> selector)
18. public static IObservable<decimal?> Sum<TSource>(this IObservable<TSource> source, Func<TSource, decimal?> selector)
19. public static IObservable<int?> Sum<TSource>(this IObservable<TSource> source, Func<TSource, int?> selector)
20. public static IObservable<long?> Sum<TSource>(this IObservable<TSource> source, Func<TSource, long?> selector)

1. Overload¶

public static IObservable<double> Sum(this IObservable<double> source)

Summary: Computes the sum of a sequence of Double values.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of Double values to calculate the sum of.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.

2. Overload¶

public static IObservable<float> Sum(this IObservable<float> source)

Summary: Computes the sum of a sequence of Single values.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of Single values to calculate the sum of.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.

3. Overload¶

public static IObservable<decimal> Sum(this IObservable<decimal> source)

Summary: Computes the sum of a sequence of Decimal values.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of Decimal values to calculate the sum of.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.
System.OverflowException	(Asynchronous) The sum of the elements in the source sequence is larger than MaxValue.

4. Overload¶

public static IObservable<int> Sum(this IObservable<int> source)

Summary: Computes the sum of a sequence of Int32 values.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of Int32 values to calculate the sum of.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.
System.OverflowException	(Asynchronous) The sum of the elements in the source sequence is larger than MaxValue.

5. Overload¶

public static IObservable<long> Sum(this IObservable<long> source)

Summary: Computes the sum of a sequence of Int64 values.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of Int64 values to calculate the sum of.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.
System.OverflowException	(Asynchronous) The sum of the elements in the source sequence is larger than MaxValue.

6. Overload¶

public static IObservable<double?> Sum(this IObservable<double?> source)

Summary: Computes the sum of a sequence of nullable Double values.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of nullable Double values to calculate the sum of.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.

7. Overload¶

public static IObservable<float?> Sum(this IObservable<float?> source)

Summary: Computes the sum of a sequence of nullable Single values.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of nullable Single values to calculate the sum of.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.

8. Overload¶

public static IObservable<decimal?> Sum(this IObservable<decimal?> source)

Summary: Computes the sum of a sequence of nullable Decimal values.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of nullable Decimal values to calculate the sum of.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.
System.OverflowException	(Asynchronous) The sum of the elements in the source sequence is larger than MaxValue.

9. Overload¶

public static IObservable<int?> Sum(this IObservable<int?> source)

Summary: Computes the sum of a sequence of nullable Int32 values.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of nullable Int32 values to calculate the sum of.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.
System.OverflowException	(Asynchronous) The sum of the elements in the source sequence is larger than MaxValue.

10. Overload¶

public static IObservable<long?> Sum(this IObservable<long?> source)

Summary: Computes the sum of a sequence of nullable Int64 values.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of nullable Int64 values to calculate the sum of.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.
System.OverflowException	(Asynchronous) The sum of the elements in the source sequence is larger than MaxValue.

11. Overload¶

public static IObservable<double> Sum<TSource>(this IObservable<TSource> source, Func<TSource, double> selector)

Summary: Computes the sum of a sequence of Double values that are obtained by invoking a transform function on each element of the input sequence.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of values that are used to calculate a sum.
`selector`	Func	A transform function to apply to each element.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.

12. Overload¶

public static IObservable<float> Sum<TSource>(this IObservable<TSource> source, Func<TSource, float> selector)

Summary: Computes the sum of a sequence of Single values that are obtained by invoking a transform function on each element of the input sequence.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of values that are used to calculate a sum.
`selector`	Func	A transform function to apply to each element.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.

13. Overload¶

public static IObservable<decimal> Sum<TSource>(this IObservable<TSource> source, Func<TSource, decimal> selector)

Summary: Computes the sum of a sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of values that are used to calculate a sum.
`selector`	Func	A transform function to apply to each element.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.
System.OverflowException	(Asynchronous) The sum of the projected values for the elements in the source sequence is larger than MaxValue.

14. Overload¶

public static IObservable<int> Sum<TSource>(this IObservable<TSource> source, Func<TSource, int> selector)

Summary: Computes the sum of a sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of values that are used to calculate a sum.
`selector`	Func	A transform function to apply to each element.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.
System.OverflowException	(Asynchronous) The sum of the projected values for the elements in the source sequence is larger than MaxValue.

15. Overload¶

public static IObservable<long> Sum<TSource>(this IObservable<TSource> source, Func<TSource, long> selector)

Summary: Computes the sum of a sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of values that are used to calculate a sum.
`selector`	Func	A transform function to apply to each element.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.
System.OverflowException	(Asynchronous) The sum of the projected values for the elements in the source sequence is larger than MaxValue.

16. Overload¶

public static IObservable<double?> Sum<TSource>(this IObservable<TSource> source, Func<TSource, double?> selector)

Summary: Computes the sum of a sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of values that are used to calculate a sum.
`selector`	Func	A transform function to apply to each element.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.

17. Overload¶

public static IObservable<float?> Sum<TSource>(this IObservable<TSource> source, Func<TSource, float?> selector)

Summary: Computes the sum of a sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of values that are used to calculate a sum.
`selector`	Func	A transform function to apply to each element.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.

18. Overload¶

public static IObservable<decimal?> Sum<TSource>(this IObservable<TSource> source, Func<TSource, decimal?> selector)

Summary: Computes the sum of a sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of values that are used to calculate a sum.
`selector`	Func	A transform function to apply to each element.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.
System.OverflowException	(Asynchronous) The sum of the projected values for the elements in the source sequence is larger than MaxValue.

19. Overload¶

public static IObservable<int?> Sum<TSource>(this IObservable<TSource> source, Func<TSource, int?> selector)

Summary: Computes the sum of a sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of values that are used to calculate a sum.
`selector`	Func	A transform function to apply to each element.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.
System.OverflowException	(Asynchronous) The sum of the projected values for the elements in the source sequence is larger than MaxValue.

20. Overload¶

public static IObservable<long?> Sum<TSource>(this IObservable<TSource> source, Func<TSource, long?> selector)

Summary: Computes the sum of a sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	A sequence of values that are used to calculate a sum.
`selector`	Func	A transform function to apply to each element.

Returns: IObservable -- An observable sequence containing a single element with the sum of the values in the source sequence.

Remarks

The return type of this operator differs from the corresponding operator on IEnumerable in order to retain asynchronous behavior.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.
System.OverflowException	(Asynchronous) The sum of the projected values for the elements in the source sequence is larger than MaxValue.