ArcEngine解除锁定的数据文件Lock

messii

说明

在ArcEngine开发中可有时候会有这样需要，在不关闭ArcEngine应用程序的情况下，对图层数据做相应的操作，如将图层数据压缩打包。对这个问题ArcEngine提供了相应的接口控制。

解锁资源文件

解除对资源文件的锁定需要使用IWorkspaceFactoryLockControl接口，默认情况下对资源文件的锁定状态是打开的，可通过如下的方式得知：ipWsFactoryLock.SchemaLockingEnabled

​解锁资源文件的一般步骤：使用IWorkspaceFactoryLockControl接口关闭资源锁定，然后在使用完AE COM接口后，使用ComRelease释放COM接口即可。

示例源码如下：

private void mnuItemUnlockFGDB_Click(object sender, EventArgs e)

​{

        IWorkspaceFactory2 ipWsFactory = new FileGDBWorkspaceFactoryClass();

         //关闭资源锁定

IWorkspaceFactoryLockControl ipWsFactoryLock;

ipWsFactoryLock = (IWorkspaceFactoryLockControl)ipWsFactory;

if (ipWsFactoryLock.SchemaLockingEnabled)

{

​ipWsFactoryLock.DisableSchemaLocking();

}

String strConn = "DATABASE=F:\\临时测试\\world.gdb";

IWorkspace ipWorkspace = ipWsFactory.OpenFromString(strConn,0);

IFeatureWorkspace ipFtWorkspace = (IFeatureWorkspace)ipWorkspace;

IFeatureDataset ipFtDataset = ipFtWorkspace.OpenFeatureDataset("world");

IEnumDataset ipEnumDataset = ipFtDataset.Subsets;

ipEnumDataset.Reset();

IDataset ipDataset = ipEnumDataset.Next();

while (ipDataset!=null)

{

IFeatureClass ipFtClass = (IFeatureClass)ipDataset;

IFeatureLayer ipFtLayer = new FeatureLayerClass();

ipFtLayer.FeatureClass = ipFtClass;

ipFtLayer.Name = ipDataset.Name;

                  //对图层做相关操作处理

ipDataset = ipEnumDataset.Next();

ComReleaser.ReleaseCOMObject(ipFtClass);

ComReleaser.ReleaseCOMObject(ipFtLayer);

}

ComReleaser.ReleaseCOMObject(ipWorkspace);

ComReleaser.ReleaseCOMObject(ipFtWorkspace);

ComReleaser.ReleaseCOMObject(ipFtDataset);

ComReleaser.ReleaseCOMObject(ipEnumDataset);

ComReleaser.ReleaseCOMObject(ipDataset);

ComReleaser.ReleaseCOMObject(ipWsFactory);

ComReleaser.ReleaseCOMObject(ipWsFactoryLock);

}

jimi21

感谢分享！