编写在arcgis engine中筛选某个要素并居中显示的完整代码

在ArcGIS Engine中，你可以使用`IFeatureSelection`和`IActiveView`接口来筛选要素并调整地图视图使其居中于选定要素。以下是一个简化的示例代码片段，假设你已经有了一个`IMxDocument`对象`mxDoc`，`IFeatureLayer`对象`featureLayer`和一个`IGeoReference`对象`geoRef`：

// 获取当前地图文档的主数据层
IFeatureLayer mainLayer = mxDoc.FocusMap.Layer[0] as IFeatureLayer;

// 创建一个要素选择器
IFeatureSelection featureSelection = new FeatureSelectionClass();

// 设置要筛选的条件（例如，ID等于特定值）
int targetId = 1; // 替换为你想筛选的要素ID
string whereClause = string.Format("ObjectID={0}", targetId);
mainLayer.SelectFeatures(featureSelection, esriSelectionResultType.newselection, ref whereClause);

// 筛选后获取选中的要素集合
ICollection<IFeature> selectedFeatures = featureSelection.SelectionSet;

// 如果有选中的要素
if (selectedFeatures.Count > 0)
{
    // 获取第一个要素的几何信息
    IFeature selectedFeature = selectedFeatures.Cast<IFeature>().First();
    IGeometry geometry = selectedFeature.Shape;

    // 将地图中心移动到要素中心
    IPoint center = geoRef.Project(geometry.GetCentroid(), null);
    IActiveView activeView = mxDoc.ActiveView;
    activeView.SetCenter(center.X, center.Y);
    activeView.ZoomExtents(activeView.Extent.AddMargin(50)); // 加上一定的缓冲区防止边缘裁剪
}