Summary
    Returns a 
		ItemsConstraintExpression which will apply
    the following constraint to only one member of the collection,
    and fail if none or more than one match occurs.
    - Namespace
 - TCLite
.Constraints  - Containing Type
 - ConstraintExpression
 
Syntax
public ItemsConstraintExpression One { get; }
	Value
| Type | Description | 
|---|---|
| Items | 
					
