arcgis二次开发属性查询
时间: 2023-08-22 19:09:58 浏览: 72
在 ArcGIS 中进行属性查询,可以使用 ArcObjects 进行二次开发。以下是一个简单的示例,介绍如何使用 ArcObjects 进行属性查询:
1. 首先需要添加以下引用:
- ESRI.ArcGIS.Geodatabase
- ESRI.ArcGIS.DataSourcesFile
- ESRI.ArcGIS.Geometry
2. 创建一个工作空间对象,打开要查询的数据源:
```csharp
IWorkspaceFactory workspaceFactory = new ShapefileWorkspaceFactory();
IWorkspace workspace = workspaceFactory.OpenFromFile(@"C:\data", 0);
IFeatureWorkspace featureWorkspace = workspace as IFeatureWorkspace;
IFeatureClass featureClass = featureWorkspace.OpenFeatureClass("myShapefile");
```
3. 创建一个查询过滤器,指定要查询的属性和条件:
```csharp
IQueryFilter queryFilter = new QueryFilter();
queryFilter.WhereClause = "population > 1000000";
```
4. 执行查询并遍历结果:
```csharp
IFeatureCursor featureCursor = featureClass.Search(queryFilter, false);
IFeature feature = featureCursor.NextFeature();
while (feature != null)
{
// 处理查询结果
feature = featureCursor.NextFeature();
}
```
注意,上述示例仅为演示用途,实际应用中还需要考虑异常处理、资源释放等问题。