<?xml version="1.0" encoding="utf-8"?>
<ECSchema schemaName="MyECSchema" nameSpacePrefix="MyNSPre" version="1.0" description="MyDesc" displayLabel="MyDisLab" xmlns="http://www.bentley.com/schemas/Bentley.ECXML.2.0">
    <ECClass typeName="MyClass" description="MyDesc" displayLabel="MyClassDisLab" isDomainClass="True">
        <ECProperty propertyName="PropStr" typeName="string" />
        <ECProperty propertyName="PropDou" typeName="double" />
        <ECArrayProperty propertyName="PropArr" typeName="point3d" minOccurs="0" maxOccurs="unbounded" />
    </ECClass>
</ECSchema>

如上所示的ECSchema中，在“MyClass”下的“PropArr”是一个数组类型的属性，我们在对元素添加“MyClass”类型属性时，可以参考如下代码对数组类型的EC属性赋值：

DgnECManager manager = DgnECManager.Manager;
            FindInstancesScope scope = FindInstancesScope.CreateScope(ele, new FindInstancesScopeOption(DgnECHostType.Element, true));
            FindInstancesScope scopeTemp = FindInstancesScope.CreateScope(Session.Instance.GetActiveDgnFile(), new FindInstancesScopeOption());
            int verMaj = 01, verMin = 0;
            IECSchema ecschema = DgnECManager.Manager.LocateSchemaInScope(scopeTemp, "MyECSchema", verMaj, verMin, SchemaMatchType.Latest);
            if (ecschema == null)
            {
                return;
            }
            IECClass ecclass = ecschema.GetClass("MyClass");
            if (ecclass == null)
            {
                return;
            }
            ECQuery query = new ECQuery(ecclass);
            using (DgnECInstanceCollection ecInstances = manager.FindInstances(scope, query))
            {
                int cnt = ecInstances.Count();
                if (cnt > 0)
                {
                    foreach (IDgnECInstance dgnEcIns in ecInstances)
                    {
                        var ecVal = dgnEcIns["PropArr"];
                        if (ecVal.IsArray)
                        {
                            IECArrayValue ecArrVal = ecVal as IECArrayValue;
                            var ecArrItemVal = ecArrVal[0];
                            ECDPoint3dValue ecDPtVal = ecArrVal[0] as ECDPoint3dValue;
                            for (int i = 0; i < ecArrVal.Count; i++)
                            {
                                ECDPoint3dValue ecPtVal = ecArrVal[i] as ECDPoint3dValue;
                                if (null != ecPtVal)
                                {
                                    MessageBox.Show(ecPtVal.DPoint3dValue.ToString());
                                }
                            }
                        }
                    }
                    return;
                }
                DgnECInstanceEnabler instanceEnabler = DgnECManager.Manager.ObtainInstanceEnabler(Bentley.MstnPlatformNET.Session.Instance.GetActiveDgnFile(), ecclass);
                StandaloneECDInstance instance = instanceEnabler.SharedWipInstance;
                instance.SetString("PropStr", "MyVal");
                instance.SetDouble("PropDou", 200.0);
                IECPropertyValue iECPropVal = instance["PropArr"];
                IECArrayValue iECArrVal = iECPropVal as IECArrayValue;
                iECArrVal[0].NativeValue = new DPoint3d(1, 2, 3);
                iECArrVal[1].NativeValue = new DPoint3d(4, 5, 6);
                iECArrVal[2].NativeValue = new DPoint3d(7, 8, 9);
                instanceEnabler.CreateInstanceOnElement(ele, instance, false);
            }