CIMUniqueValueRenderer是ArcGIS Pro SDK中的一个类，用于创建唯一值渲染器（Unique Value Renderer）。

在ArcGIS Pro中长这样：

通过对CIMUniqueValueRenderer的操作，可以对符号系统进行更改，实现很多功能。

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1、获取CIMUniqueValueRenderer

// 获取CIMUniqueValueRenderer
CIMUniqueValueRenderer uvr = featureLayer.GetRenderer() as CIMUniqueValueRenderer;

2、获取符号项

// 获取符号项
CIMUniqueValueClass[] uvClasses = uvr.Groups[0].Classes;

3、逐行对符号项进行操作

// 逐行对符号项进行操作
foreach (CIMUniqueValueClass uvClass in uvClasses)
{
    // TODO                     
}

4、获取符号项的值

// 获取符号项的值
string va = uvClass.Values[0].FieldValues[0].ToString();

5、获取、赋值符号项的标注

// 获取符号项的标注
string lab = uvClass.Label;
// 给符号项的标注赋值
uvClass.Label = "飘游";

6、对符号项进行筛选

// 对符号项进行筛选
uvr.Groups[0].Classes = uvClasses.Where(x =>dic01.ContainsKey(x.Values[0].FieldValues[0].ToString())).ToArray();

7、通过lyrx文件获取到CIMUniqueValueRenderer

// 通过lyrx文件获取到CIMUniqueValueRenderer
LayerDocument lyrFile = new LayerDocument(def_path + @"\三调用地fin.lyrx");

CIMLayerDocument cimLyrDoc = lyrFile.GetCIMLayerDocument();

CIMUniqueValueRenderer uvr = ((CIMFeatureLayer)cimLyrDoc.LayerDefinitions[0]).Renderer as CIMUniqueValueRenderer;

8、设置CIMUniqueValueRenderer的值字段

// 设置CIMUniqueValueRenderer的值字段
uvr.Fields = new string[] { "DLBM" };

9、给图层应用渲染器

// 给图层应用渲染器
ly.SetRenderer(uvr);

10、通过字典修改符号项的标注

// 获取当前地图
var map = MapView.Active.Map;
// 获取图层
FeatureLayer featureLayer = MapView.Active.GetSelectedLayers().FirstOrDefault() as FeatureLayer;

// 获取CIMUniqueValueRenderer
CIMUniqueValueRenderer uvr = featureLayer.GetRenderer() as CIMUniqueValueRenderer;

// 获取映射字段
string mapFieldName = uvr.Fields.FirstOrDefault();
// 获取字段值映射表
Dictionary<string, string> dic01 = new Dictionary<string, string>();
Dictionary<string, string> dic02 = new Dictionary<string, string>();
if (field01 != "")
{
    dic01 = featureLayer.Get2FieldValueDic(mapFieldName, field01);
}
if (field02 != "")
{
    dic02 = featureLayer.Get2FieldValueDic(mapFieldName, field02);
}

CIMUniqueValueClass[] uvClasses = uvr.Groups[0].Classes;
// 修改每个标注类别的表达式
foreach (CIMUniqueValueClass uvClass in uvClasses)
{
    // 映射字段值
    string va = uvClass.Values[0].FieldValues[0].ToString();

    // 获取标注字段值
    string fieldValue01 = "";
    string fieldValue02 = "";
    if (dic01.ContainsKey(va))
    {
        fieldValue01 = dic01[va];
    }
    if (dic02.ContainsKey(va))
    {
        fieldValue02 = dic02[va];
    }
    // 标注
    uvClass.Label = txtFront + fieldValue01 + fieldValue02 + txtBack;

}
pw.AddProcessMessage(40, time_base, "删除计数值为0的行");

// 删除计数值为0的行
uvr.Groups[0].Classes = uvClasses.Where(x => dic01.ContainsKey(x.Values[0].FieldValues[0].ToString())).ToArray();

// 应用渲染器
featureLayer.SetRenderer(uvr);

11、通过lyrx文件应用符号系统给图层

// 应用符号系统
LayerDocument lyrFile = new LayerDocument(def_path + @"\三调用地fin.lyrx");

CIMLayerDocument cimLyrDoc = lyrFile.GetCIMLayerDocument();

CIMUniqueValueRenderer uvr = ((CIMFeatureLayer)cimLyrDoc.LayerDefinitions[0]).Renderer as CIMUniqueValueRenderer;

uvr.Fields = new string[] { "DLBM" };
// 修改每个标注类别的表达式
foreach (CIMUniqueValueClass uvClass in uvr.Groups[0].Classes)
{
    var va = uvClass.Values[0].FieldValues[0].ToString();
    uvClass.Label = va + DataLib.dic_sdAll[va];
}
// 应用渲染器
ly.SetRenderer(uvr);

12、创建一个CIMUniqueValueRenderer并应用给图层

var flyr = MapView.Active.GetSelectedLayers()[0] as FeatureLayer;
// 设置唯一值的字段
var fields = new List<string> { "Type" }; 

// 构造一个点符号作为模板符号
CIMPointSymbol pointSym = SymbolFactory.Instance.ConstructPointSymbol(
      ColorFactory.Instance.GreenRGB, 16.0, SimpleMarkerStyle.Pushpin);  
CIMSymbolReference symbolPointTemplate = pointSym.MakeSymbolReference();

// 构造一个UniqueValueRendererDefinition
UniqueValueRendererDefinition uniqueValueRendererDef =
new UniqueValueRendererDefinition(fields, symbolPointTemplate);

// 创建一个唯一值渲染器
CIMUniqueValueRenderer uniqueValueRenderer = flyr.CreateRenderer(uniqueValueRendererDef) as CIMUniqueValueRenderer;

// 应用到图层
flyr.SetRenderer(uniqueValueRenderer);