CIMLabelClass（Cartographic Information Model Label Class）是ArcGIS Pro SDK中的一个类。

它主要用于定义标签的样式和属性，如字体、大小、颜色、对齐方式等，以及标签的排列和布局规则。

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1、获取当前地图的标签引擎

// 获取当前地图的定义【CIMMap】
CIMMap cimMap = MapView.Active.Map.GetDefinition();
// 从【CIMMap】中获取标签引擎
CIMGeneralPlacementProperties labelEngine = cimMap.GeneralPlacementProperties;

2、修改当前地图的标签引擎

// 获取当前地图的定义【CIMMap】
CIMMap cimMap = MapView.Active.Map.GetDefinition();
// 从【CIMMap】中获取标签引擎
CIMGeneralPlacementProperties labelEngine = cimMap.GeneralPlacementProperties;
// 创建一个新的Maplex标签引擎
CIMMaplexGeneralPlacementProperties mgp = new CIMMaplexGeneralPlacementProperties();
// 设置标签引擎
cimMap.GeneralPlacementProperties = mgp;
// 应用到地图设置中
MapView.Active.Map.SetDefinition(cimMap);

3、将文字符号TextSymbol应用到要素图层

// 获取图层
FeatureLayer featureLayer = MapView.Active.GetSelectedLayers().FirstOrDefault() as FeatureLayer;
// 获取图层定义
CIMFeatureLayer lyrDefn = featureLayer.GetDefinition() as CIMFeatureLayer;
// 获取标注，转为List
var listLabelClasses = lyrDefn.LabelClasses.ToList();
CIMLabelClass theLabelClass = listLabelClasses.FirstOrDefault();
// 创建一个CIMTextSymbol
CIMTextSymbol textSymbol = SymbolFactory.Instance.ConstructTextSymbol(ColorFactory.Instance.BlueRGB, 8, "Corbel", "Regular");
// 设置文字样式TextSymbol
theLabelClass.TextSymbol.Symbol = textSymbol;
// 将listLabelClasses转为Array
lyrDefn.LabelClasses = listLabelClasses.ToArray();
// 应用标注
featureLayer.SetDefinition(lyrDefn);
// 打开标注
featureLayer.SetLabelVisibility(true);

4、更改标签位置——点

// 获取图层
FeatureLayer featureLayer = MapView.Active.GetSelectedLayers().FirstOrDefault() as FeatureLayer;
// 获取图层定义
CIMFeatureLayer lyrDefn = featureLayer.GetDefinition() as CIMFeatureLayer;
// 获取标注，转为List
var listLabelClasses = lyrDefn.LabelClasses.ToList();
CIMLabelClass theLabelClass = listLabelClasses.FirstOrDefault();
// 更新标注位置
// 根据标签引擎的不同，需要分别处理
CIMGeneralPlacementProperties labelEngine = MapView.Active.Map.GetDefinition().GeneralPlacementProperties;
if (labelEngine is CIMStandardGeneralPlacementProperties)
{theLabelClass.StandardLabelPlacementProperties.PointPlacementMethod = StandardPointPlacementMethod.OnTopPoint;
}
else
{theLabelClass.MaplexLabelPlacementProperties.PointPlacementMethod = MaplexPointPlacementMethod.CenteredOnPoint;
}
// 将listLabelClasses转为Array
lyrDefn.LabelClasses = listLabelClasses.ToArray();
// 应用标注
featureLayer.SetDefinition(lyrDefn);
// 打开标注
featureLayer.SetLabelVisibility(true);

5、更改标签位置——线

// 获取图层
FeatureLayer featureLayer = MapView.Active.GetSelectedLayers().FirstOrDefault() as FeatureLayer;
// 获取图层定义
CIMFeatureLayer lyrDefn = featureLayer.GetDefinition() as CIMFeatureLayer;
// 获取标注，转为List
var listLabelClasses = lyrDefn.LabelClasses.ToList();
CIMLabelClass theLabelClass = listLabelClasses.FirstOrDefault();
// 更新标注位置
// 根据标签引擎的不同，需要分别处理
CIMGeneralPlacementProperties labelEngine = MapView.Active.Map.GetDefinition().GeneralPlacementProperties;
if (labelEngine is CIMStandardGeneralPlacementProperties)
{var lineLablePosition = new CIMStandardLineLabelPosition{Perpendicular = false,    // 垂直Parallel = false,     // 平行ProduceCurvedLabels = true,    // 曲线Horizontal = false,   // 水平OnTop = false    // 位于上方};theLabelClass.StandardLabelPlacementProperties.LineLabelPosition = lineLablePosition;
}
else
{theLabelClass.MaplexLabelPlacementProperties.LinePlacementMethod = MaplexLinePlacementMethod.CenteredPerpendicularOnLine;theLabelClass.MaplexLabelPlacementProperties.LineFeatureType = MaplexLineFeatureType.General;
}
// 将listLabelClasses转为Array
lyrDefn.LabelClasses = listLabelClasses.ToArray();
// 应用标注
featureLayer.SetDefinition(lyrDefn);
// 打开标注
if (!featureLayer.IsLabelVisible) { featureLayer.SetLabelVisibility(true); }

6、更改标签位置——面

// 获取图层
FeatureLayer featureLayer = MapView.Active.GetSelectedLayers().FirstOrDefault() as FeatureLayer;
// 获取图层定义
CIMFeatureLayer lyrDefn = featureLayer.GetDefinition() as CIMFeatureLayer;
// 获取标注，转为List
var listLabelClasses = lyrDefn.LabelClasses.ToList();
CIMLabelClass theLabelClass = listLabelClasses.FirstOrDefault();
// 更新标注位置
// 根据标签引擎的不同，需要分别处理
CIMGeneralPlacementProperties labelEngine = MapView.Active.Map.GetDefinition().GeneralPlacementProperties;
if (labelEngine is CIMStandardGeneralPlacementProperties)
{theLabelClass.StandardLabelPlacementProperties.PolygonPlacementMethod =StandardPolygonPlacementMethod.AlwaysHorizontal;theLabelClass.StandardLabelPlacementProperties.PlaceOnlyInsidePolygon = true;
}
else
{theLabelClass.MaplexLabelPlacementProperties.PolygonFeatureType =MaplexPolygonFeatureType.LandParcel;theLabelClass.MaplexLabelPlacementProperties.AvoidPolygonHoles = true;theLabelClass.MaplexLabelPlacementProperties.PolygonPlacementMethod =MaplexPolygonPlacementMethod.HorizontalInPolygon;theLabelClass.MaplexLabelPlacementProperties.CanPlaceLabelOutsidePolygon = true;
}
// 将listLabelClasses转为Array
lyrDefn.LabelClasses = listLabelClasses.ToArray();
// 应用标注
featureLayer.SetDefinition(lyrDefn);
// 打开标注
if (!featureLayer.IsLabelVisible) { featureLayer.SetLabelVisibility(true); }

7、更改对齐方式【Maplex】

// 点、面
theLabelClass.MaplexLabelPlacementProperties.GraticuleAlignment = true;
theLabelClass.MaplexLabelPlacementProperties.GraticuleAlignmentType = MaplexGraticuleAlignmentType.Curved;
// 线
theLabelClass.MaplexLabelPlacementProperties.AlignLabelToLineDirection = true;

8、更改标注旋转方式【Maplex】

// 获取图层
FeatureLayer featureLayer = MapView.Active.GetSelectedLayers().FirstOrDefault() as FeatureLayer;
// 获取图层定义
CIMFeatureLayer lyrDefn = featureLayer.GetDefinition() as CIMFeatureLayer;
// 获取标注，转为List
var listLabelClasses = lyrDefn.LabelClasses.ToList();
CIMLabelClass theLabelClass = listLabelClasses.FirstOrDefault();
// 更新标注旋转
CIMMaplexRotationProperties rotationProperties = new CIMMaplexRotationProperties
{Enable = true,RotationField = "ELEVATION", // 按字段AdditionalAngle = 15, // 角度 RotationType = MaplexLabelRotationType.Arithmetic,AlignmentType = MaplexRotationAlignmentType.Perpendicular,AlignLabelToAngle = true
};
// 应用属性设置
theLabelClass.MaplexLabelPlacementProperties.RotationProperties = rotationProperties;
// 将listLabelClasses转为Array
lyrDefn.LabelClasses = listLabelClasses.ToArray();
// 应用标注
featureLayer.SetDefinition(lyrDefn);
// 打开标注
if (!featureLayer.IsLabelVisible) { featureLayer.SetLabelVisibility(true); }

9、更改标注表达式

// 获取图层
FeatureLayer featureLayer = MapView.Active.GetSelectedLayers().FirstOrDefault() as FeatureLayer;
// 获取图层定义
CIMFeatureLayer lyrDefn = featureLayer.GetDefinition() as CIMFeatureLayer;
// 获取标注
var listLabelClasses = lyrDefn.LabelClasses.ToList();
CIMLabelClass theLabelClass = listLabelClasses.FirstOrDefault();
// 设置标注语言为python
theLabelClass.ExpressionEngine = LabelExpressionEngine.Python;
// 设置标注内容
string code = $"import……  ";
theLabelClass.Expression = code;
// 应用标注设置
lyrDefn.LabelClasses[0] = theLabelClass; // 假设只有一个标注类别
// 应用标注
featureLayer.SetDefinition(lyrDefn);
// 打开标注
if (!featureLayer.IsLabelVisible) { featureLayer.SetLabelVisibility(true); }