ArcGIS Enigne使用Geoprocessor

 如果在使用相关工具传入参数是对象或相对数据库内路径时，需要给“workspace”环境变量设置值，可以是IWorkspace或数据库路径。

  如果需要为此环境变量设置值（后面也会说如何避免设置此环境变量的值），最好是数据库路径，而不要直接设置IWorkspace对象。经过实际使用经验，感觉如果将IWorkspace对象传入到Geoprocessor环境后，后继的处理偶尔会出现一些无法解释的异常。代码如下：

Geoprocessor GP = new Geoprocessor(); 

string sWorkPath;  
IWorkspace pWork;  
if(pWork.Type == esriWorkspaceType.esriRemoteDatabaseWorkspace)

{  
    sWorkPath = System.IO.Path.Combine(Application.StartupPath,"gpenvwk.sde");  
    pWork.WorkspaceFactory.Create(Application.StartupPath,"gpenvwk.sde",pWork.ConnectionProperties,0);  
}

else

{  
    sWorkPath = pWork.PathName;  
}  
GP.SetEnvironmentValue("workspace",sWorkPath);  
GP.OverwriteOutput = true;   

ESRI.ArcGIS.AnalysisTools.Intersect pIntersect = new ESRI.ArcGIS.AnalysisTools.Intersect();  
pIntersect.cluster_tolerance = 0.01;  
pIntersect.in_features = "TestPline;TestPgon";  
pIntersect.out_feature_class = "Test_intRslt";  
pIntersect.join_attributes = "ONLY_FID";  
pIntersect.output_type = "INPUT";   

GP.Execute(pIntersect,null); 

 

 上面提到，如果不设置“workspace”环境变量时，那么输入输出参数就不能是表名或要素类名，而必须包含数据库路径名（要素类在要素集中时。提示：对于输入参数，路径串中的要素集名是可选的）。同样功能代码如下：

Geoprocessor GP = new Geoprocessor();   

string sWorkPath;  
IWorkspace pWork;  
if(pWork.Type == esriWorkspaceType.esriRemoteDatabaseWorkspace)

{  
    sWorkPath = System.IO.Path.Combine(Application.StartupPath,"gpenvwk.sde");  
    pWork.WorkspaceFactory.Create(Application.StartupPath,"gpenvwk.sde",pWork.ConnectionProperties,0);  
}

else

{  
    sWorkPath = pWork.PathName;  
}   

GP.OverwriteOutput = true;   

ESRI.ArcGIS.AnalysisTools.Intersect pIntersect = new ESRI.ArcGIS.AnalysisTools.Intersect();  
pIntersect.cluster_tolerance = 0.01;  
pIntersect.in_features = sWorkPath+"\\TestPline;"+sWorkPath+"\\TestPgon";  
pIntersect.out_feature_class = sWorkPath+"\\Result\\Test_intRslt";  
pIntersect.join_attributes = "ONLY_FID";  
pIntersect.output_type = "INPUT";  
GP.Execute(pIntersect,null);  

两种方式各有优缺点：

用环境变量设置Workspace路径时，只能设置一个。如果需要对多个数据库进行处理时，其它数据库只能通过参数传入；

用参数传入Workspace路径时，对一些特殊符需要处理：碰到路径中包含有空格、分号时，需要把路径用双引号（或单引号）包含起来，如：pIntersect.in_features = "\""+sWorkPath+"\\TestPline\";\""+sWorkPath+"\\TestPgon\"";

 但如果路径中含有单引号时，不管是否用双引号包含，都会出错。（这个错误我感觉是ArcGIS的Bug）