/// <summary>
/// 相交分析，返回相交部分的要素（注意输入要素类和叠加要素类不能有空几何等问题）
/// </summary>
/// <param name="inClass">输入的要素类</param>
/// <param name="overlayClass">叠加的要素类</param>
/// <param name="outPath">保存分析结果的工作空间路径</param>
/// <param name="outName">保存分析结果的要素类名称</param>
/// <returns></returns>
public static IFeatureClass Intersect(this IFeatureClass inClass, IFeatureClass overlayClass, string outPath, string outName)
{
var workspaceType = WorkspaceEx.GetDefaultWorkspaceType(outPath);
if (workspaceType == EWorkspaceType.Default)
{
throw new Exception($"工作空间路径(outPath)不存在！{outPath} 该路径必须是已存在的mdb文件路径，或shp所在文件夹路径，或gdb文件夹路径，或sde连接字符串");
}
IFeatureClassName outClassName = new FeatureClassNameClass
{
ShapeType = inClass.ShapeType,
ShapeFieldName = inClass.ShapeFieldName,
FeatureType = esriFeatureType.esriFTSimple
};
IWorkspaceName workspaceName = new WorkspaceNameClass
{
WorkspaceFactoryProgID = workspaceType.GetDescription(1),
PathName = outPath
};
IDatasetName datasetName = (IDatasetName)outClassName;
datasetName.Name = outName;
datasetName.WorkspaceName = workspaceName;
return(new BasicGeoprocessorClass().Intersect((ITable)inClass, false, (ITable)overlayClass, false, 0.01, outClassName));
}
/// <summary>
/// 设置图层数据源
/// </summary>
/// <param name="layer">设置数据源的图层</param>
/// <param name="workspacePath">工作空间路径</param>
/// <param name="dataSetName">数据集名称，数据源不在数据集中则应为null</param>
/// <param name="objectName">图层关联对象的名称，即要素类名称或栅格数据集名称</param>
public static void SetSourcePath(this ILayer layer, string workspacePath, string dataSetName, string objectName)
{
if (!WorkspaceEx.IsWorkspacePath(workspacePath) &&
!WorkspaceEx.IsConnectionString(workspacePath))
{
throw new ArgumentException($"找不到数据源({workspacePath})，请指定正确的数据源！");
}
switch (layer)
{
case IFeatureLayer featureLayer:
if (featureLayer is IDataLayer dataLayer)
{
IDatasetName datasetName = (IDatasetName)dataLayer.DataSourceName;
EWorkspaceType eWorkspaceType = WorkspaceEx.GetDefaultWorkspaceType(workspacePath);
datasetName.WorkspaceName.WorkspaceFactoryProgID = eWorkspaceType.GetDescription(1);
datasetName.WorkspaceName.PathName = workspacePath;
//TODO:
if (!string.IsNullOrWhiteSpace(dataSetName))
{
datasetName.Category = dataSetName;
}
if (!string.IsNullOrWhiteSpace(objectName))
{
datasetName.Name = objectName;
}
}
break;
case IRasterLayer rasterLayer:
objectName = string.IsNullOrWhiteSpace(objectName)
? ((rasterLayer as IDataLayer)?.DataSourceName as IDatasetName)?.Name
: objectName;
if (objectName == null)
{
throw new Exception($"指定数据源名称（参数{nameof(objectName)}）不能为空！");
}
rasterLayer.CreateFromFilePath(!string.IsNullOrWhiteSpace(dataSetName)
? Path.Combine(workspacePath, dataSetName, objectName)
: Path.Combine(workspacePath, objectName));
break;
case IGroupLayer groupLayer:
throw new Exception("该图层对象为图层组(IGroupLayer)，无法设置图层组的数据源，请指定到具体的图层");
default:
throw new NotImplementedException(
"图层不是要素图层(IFeatureLayer)，也不是栅格图层(IRasterLayer)，未实现其他类型图层的数据源设置");
}
}
