public sealed class DimensionFeatureClassDescription : FeatureClassDescription 

public void CreateDimensionFeatureClass(Geodatabase geodatabase)
{
    // Dimension feature class name
    string dimensionFeatureClassName = "LineInfo";

    // Create user defined attribute fields for dimension feature class 
    FieldDescription nameFieldDescription = new FieldDescription("Name", FieldType.String);
    FieldDescription distanceFieldDescription = new FieldDescription("DistanceMeasure", FieldType.Double);
    FieldDescription measurementDateFieldDescription = new FieldDescription("MeasurementDate", FieldType.Date);

    // Create a list of all field descriptions
    List<FieldDescription> fieldDescriptions = new List<FieldDescription> { nameFieldDescription, distanceFieldDescription, measurementDateFieldDescription };

    // Create a ShapeDescription object
    ShapeDescription shapeDescription = new ShapeDescription(GeometryType.Polygon, SpatialReferences.WGS84);

    // Create a SchemaBuilder object
    SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);

    // Create DimensionFeatureClassDescription object
    DimensionFeatureClassDescription dimensionFeatureClassDescription = new DimensionFeatureClassDescription(dimensionFeatureClassName, fieldDescriptions,
        shapeDescription, GetCIMDimensionStyles());

    // Token
    DimensionFeatureClassToken dimensionFeatureClassToken = schemaBuilder.Create(dimensionFeatureClassDescription);

    // Execute the DDL
    bool success = schemaBuilder.Build();

    // Inspect error messages
    if (!success)
    {
        IReadOnlyList<string> errorMessages = schemaBuilder.ErrorMessages;
        //etc.
    }
}

private List<CIMDimensionStyle> GetCIMDimensionStyles()
{
    CIMColor color = CIMColor.CreateRGBColor(10, 20, 30);
    CIMPointSymbol beginMarkerSymbol = GetMarkerSymbol(color);
    CIMPointSymbol endMarkerSymbol = GetMarkerSymbol(color);
    CIMLineSymbol dimensionLineSymbol = GetLineSymbol(color, 0.5);
    CIMLineSymbol extensionLineSymbol = GetLineSymbol(color, 0.5);
    CIMTextSymbol textSymbol = GetDefaultTextSymbol(10);
    textSymbol.Symbol = GetPolygonSymbol(color, color, 0);
    textSymbol.HorizontalAlignment = HorizontalAlignment.Center;

    CIMDimensionStyle cimDimensionStyle = new CIMDimensionStyle()
    {
        Name = "Style 1",
        ID = 0,
        Align = true,
        DisplayUnits = null,
        DisplayPrecision = 0,

        BeginMarkerSymbol = beginMarkerSymbol,
        EndMarkerSymbol = endMarkerSymbol,
        MarkerOption = DimensionPartOptions.Both,
        MarkerFit = DimensionMarkerFit.Text,

        DimensionLineSymbol = dimensionLineSymbol,
        DimensionLineOption = DimensionPartOptions.Both,
        DrawLineOnFit = false,
        ExtendLineOnFit = true,

        BaselineHeight = 0.0,
        ExtensionLineSymbol = extensionLineSymbol,
        ExtensionLineOption = DimensionPartOptions.Both,
        ExtensionLineOvershot = 0.0,
        ExtensionLineOffset = 0.0,

        Expression = "",
        ExpressionParserName = "Arcade",

        TextSymbol = textSymbol,
        TextOption = DimensionTextOption.Only,
        TextFit = DimensionTextFit.MoveBegin,
    };

    List<CIMDimensionStyle> cimDimensionStyles = [cimDimensionStyle];

    return cimDimensionStyles;
}

private CIMFill DefaultFill(CIMColor color)
{
    return new CIMSolidFill()
    {
        Enable = true,
        Name = "Fill_" + Guid.NewGuid().ToString(),
        ColorLocked = false,
        Color = color
    };
}

private CIMStroke DefaultStroke(CIMColor color, double width = 1)
{
    return new CIMSolidStroke()
    {
        Color = color,
        Name = "Stroke_" + Guid.NewGuid().ToString(),
        CapStyle = LineCapStyle.Round,
        JoinStyle = LineJoinStyle.Round,
        CloseCaps3D = false,
        LineStyle3D = Simple3DLineStyle.Strip,
        MiterLimit = 4,
        Width = width,

        ColorLocked = false,
        Enable = true,
    };
}

private CIMPolygonSymbol GetPolygonSymbol(CIMColor fillColor, CIMColor outlineColor, double outlineWidth)
{
    if ((outlineColor == null) || (outlineWidth <= 0))
        return new CIMPolygonSymbol() { SymbolLayers = new CIMSymbolLayer[1] { DefaultFill(fillColor) } };
    return new CIMPolygonSymbol() { SymbolLayers = new CIMSymbolLayer[2] { DefaultStroke(outlineColor, outlineWidth), DefaultFill(fillColor) } };
}

private CIMLineSymbol GetLineSymbol(CIMColor color, double width)
{
    var stroke = DefaultStroke(color, width);

    return new CIMLineSymbol() { SymbolLayers = new CIMSymbolLayer[1] { stroke } };
}

private Polygon CreateArrowGeometry()
{
    double x = 2.39;
    double y = 1.20;
    double xMod = 0.3;

    var pt1 = new Coordinate2D() { X = -x + xMod, Y = -y };
    var pt2 = new Coordinate2D() { X = x + xMod, Y = 0 };
    var pt3 = new Coordinate2D() { X = -x + xMod, Y = y };
    var coords = new List<Coordinate2D>() { pt1, pt2, pt3 };

    var polygon = PolygonBuilderEx.CreatePolygon(coords);
    return polygon;
}

private CIMPointSymbol GetMarkerSymbol(CIMColor color)
{
    CIMMarkerGraphic graphic = new CIMMarkerGraphic()
    {
        Geometry = CreateArrowGeometry(),
        Symbol = new CIMPolygonSymbol()
        {
            SymbolLayers = new CIMSymbolLayer[1]
            {
        new CIMSolidFill()
        {
            Enable = true,
            Color = color,
        }
            },
            UseRealWorldSymbolSizes = false
        }
    };

    CIMSymbolLayer symbolLayer = new CIMVectorMarker()
    {
        Enable = true,
        Size = 12,
        Frame = new EnvelopeBuilderEx() { XMin = -5, YMin = -3, XMax = 5, YMax = 3 }.ToGeometry() as Envelope,
        MarkerGraphics = new CIMMarkerGraphic[1] { graphic },
        ScaleSymbolsProportionally = true,
        RespectFrame = true
    };

    return new CIMPointSymbol()
    {
        SymbolLayers = new CIMSymbolLayer[1] { symbolLayer },
        HaloSize = 1,
        ScaleX = 1,
        AngleAlignment = AngleAlignment.Map,
    };
}

private CIMTextSymbol GetDefaultTextSymbol(double height)
{
    return new CIMTextSymbol()
    {
        DrawGlyphsAsGeometry = false,
        DrawSoftHyphen = false,
        ExtrapolateBaselines = true,
        FlipAngle = 0.0,
        IndentAfter = 0.0,
        IndentBefore = 0.0,
        IndentFirstLine = 0.0,
        Kerning = true,
        LetterSpacing = 0.0,
        LetterWidth = 100.0,
        Ligatures = true,
        LineGap = 0.0,
        LineGapType = LineGapType.ExtraLeading,
        Underline = false,
        Strikethrough = false,
        OffsetX = 0.0,
        OffsetY = 0.0,
        FontFamilyName = "Tahoma",
        FontStyleName = "Regular",
        WordSpacing = 100.0,
        Height = height
    };
}