ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / Layer Class / Transparency Property

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    Transparency Property (Layer)
    In This Topic
    Gets the transparency value set to the layer. 100 being fully transparent and 0 means opaque.
    Syntax
    public double Transparency {get;}
    Public ReadOnly Property Transparency As Double
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also