【AE】SDE图层断开后重新连接的解决方法

问题描述：

      大家在程序中使用SDE图层时，是不是经常碰到这种情况：因网络连接中断而导致SDE图层不见了。即使之后网络连接上了，SDE图层并不会自动重新显示。

解决方法：
    在网上没找到相关资料。好吧，咱自力更生，好好研究研究AE的帮助文档，想来应该与SdeWorkspace有关，看了相关的接口，没发现什么。转念一想，SdeWorkspace 不都是由SdeWorkspaceFactory创建的嘛，查看SdeWorkspaceFactoryClass，果然发现了秘密，其实现了一个名为IWorkspaceFactoryStatus的接口。该接口的详细说明如下：

IWorkspaceFactoryStatus Interface

Provides access to members that manage workspace status information.Product Availability
Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Members

	OpenAvailableWorkspace	Makes an attempt to open a new instance of a workspace that is esriWCSDown but has since become esriWCSAvailable.
	PingWorkspaceStatus	Checks if the status of an esriWCSDown workspace has changed.
	WorkspaceStatus	Retrieve the workspace status information for all currently opened workspaces

[csharp]
view plaincopyprint?

// 重新连接SDE图层  【dxcgis】 

private void ReconnectSDELayer(IFeatureLayer featureLayer) 

{ 
          IDataset dataset = featureLayer as IDataset; 

          IWorkspaceFactory workspaceFactory = dataset.Workspace.WorkspaceFactory; 

 
          IWorkspaceFactoryStatus workspaceFactoryStatus = workspaceFactory
as IWorkspaceFactoryStatus; 
          IEnumWorkspaceStatus enumWorkspaceStatus = workspaceFactoryStatus.WorkspaceStatus; 

          IWorkspaceStatus workspaceStatus =
null; 
          while ((workspaceStatus = enumWorkspaceStatus.Next()) !=
null) 
          { 
              if (dataset.Workspace.Equals(workspaceStatus.Workspace)) 

              { 
                  break; 
              } 
          } 
 
          // 检测SDE连接是否断开  
          if (workspaceStatus !=
null && 
               workspaceStatus.ConnectionStatus == esriWorkspaceConnectionStatus.esriWCSDown) 

          { 
              IWorkspaceStatus pingedStatus = workspaceFactoryStatus.PingWorkspaceStatus(dataset.Workspace); 

              if (pingedStatus.ConnectionStatus == esriWorkspaceConnectionStatus.esriWCSAvailable) 

              { 
                  IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspaceFactoryStatus.OpenAvailableWorkspace(pingedStatus); 

                  featureLayer.FeatureClass = featureWorkspace.OpenFeatureClass(featureLayer.FeatureClass.AliasName);                      

              } 
              else if (pingedStatus.ConnectionStatus == esriWorkspaceConnectionStatus.esriWCSDown) 

              { 
                  MessageBox.Show("未能连接SDE数据库，请检查网络及数据库！",
"SDE连接提示"); 
              } 
          }  
} 

// 重新连接SDE图层  【dxcgis】
private void ReconnectSDELayer(IFeatureLayer featureLayer)
{
IDataset dataset = featureLayer as IDataset;
IWorkspaceFactory workspaceFactory = dataset.Workspace.WorkspaceFactory;

IWorkspaceFactoryStatus workspaceFactoryStatus = workspaceFactory as IWorkspaceFactoryStatus;
IEnumWorkspaceStatus enumWorkspaceStatus = workspaceFactoryStatus.WorkspaceStatus;
IWorkspaceStatus workspaceStatus = null;
while ((workspaceStatus = enumWorkspaceStatus.Next()) != null)
{
if (dataset.Workspace.Equals(workspaceStatus.Workspace))
{
break;
}
}

// 检测SDE连接是否断开
if (workspaceStatus != null &&
workspaceStatus.ConnectionStatus == esriWorkspaceConnectionStatus.esriWCSDown)
{
IWorkspaceStatus pingedStatus = workspaceFactoryStatus.PingWorkspaceStatus(dataset.Workspace);
if (pingedStatus.ConnectionStatus == esriWorkspaceConnectionStatus.esriWCSAvailable)
{
IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspaceFactoryStatus.OpenAvailableWorkspace(pingedStatus);
featureLayer.FeatureClass = featureWorkspace.OpenFeatureClass(featureLayer.FeatureClass.AliasName);
}
else if (pingedStatus.ConnectionStatus == esriWorkspaceConnectionStatus.esriWCSDown)
{
MessageBox.Show("未能连接SDE数据库，请检查网络及数据库！", "SDE连接提示");
}
}
}

后记： AE的接口真的是很丰富，我们需要好好深入研究其帮助文档，很可能，就有不少收获。