Gets or sets the tangent vector at the start of the curve. The invalid or zero vector is ignored when setting the tangent.

Namespace: Autodesk.Revit.DB.Plumbing
Assembly: RevitAPI (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0)
Since: 2014

Syntax

C#
`public XYZ StartTangent { get; set; }`

Visual Basic
`Public Property StartTangent As XYZ Get Set`

Visual C++
`public: property XYZ^ StartTangent { XYZ^ get (); void set (XYZ^ value); }`

Exceptions

Exception	Condition
Autodesk.Revit.Exceptions ArgumentNullException	When setting this property: A non-optional argument was null