AE中如何解除鎖定的資源文件

1、說明

在使用ArcGIS桌面產品的時候，有時會碰到這樣的情況：同時在ArcCatalog和ArcMap中瀏覽圖層數據，然后在ArcMap中remove掉圖層，再回到ArcCatalog中刪除該圖層，卻得到該圖層被鎖的信息。非得關掉ArcMap才能正常刪除。同樣的情況也會在ArcEngine開發的應用程序中碰到。可有時候會有這樣需要，在不關閉ArcEngine應用程序的情況下，對圖層數據做相應的操作，如將圖層數據壓縮打包。對這個問題ArcEngine提供了相應的接口控制，只是我們很少去關注而已。

2、解鎖資源文件

解除對資源文件的鎖定需要使用IWorkspaceFactoryLockControl接口，默認情況下對資源文件的鎖定狀態是打開的，可通過如下的方式得知：

ipWsFactoryLock.SchemaLockingEnabled

    解鎖資源文件的一般步驟：使用IWorkspaceFactoryLockControl接口關閉資源鎖定，然后在使用完AE COM接口后，使用ComRelease釋放COM接口即可。示例源碼如下：

private void mnuItemUnlockFGDB_Click(object sender, EventArgs e)

{

       IWorkspaceFactory2 ipWsFactory = new FileGDBWorkspaceFactoryClass();

 

         //關閉資源鎖定

IWorkspaceFactoryLockControl ipWsFactoryLock;

ipWsFactoryLock = (IWorkspaceFactoryLockControl)ipWsFactory;

if (ipWsFactoryLock.SchemaLockingEnabled)

{

ipWsFactoryLock.DisableSchemaLocking();

}

 

String strConn = "DATABASE=F:\\臨時測試\\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;

 

                  //對圖層做相關操作處理

 

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);

}