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ISetWindowFieldsPartitionExtensionsSumTInput Method (ISetWindowFieldsPartitionTInput, FuncTInput, Int64, SetWindowFieldsWindow)

Returns the sum of numeric values. $sum ignores non-numeric values.

Namespace:  MongoDB.Driver.Linq
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.22.0+75246110ed1247226fcc7f8eb2c54ffab745693e
Syntax
public static long Sum<TInput>(
	this ISetWindowFieldsPartition<TInput> partition,
	Func<TInput, long> selector,
	SetWindowFieldsWindow window = null
)

Parameters

partition
Type: MongoDB.DriverISetWindowFieldsPartitionTInput
The partition.
selector
Type: SystemFuncTInput, Int64
The selector that selects a value from the input document.
window (Optional)
Type: MongoDB.DriverSetWindowFieldsWindow
The window boundaries.

Type Parameters

TInput
The type of the input documents in the partition.

Return Value

Type: Int64
The sum of the values.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ISetWindowFieldsPartitionTInput. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
See Also