Arcengine 打开Tin

public static ILayer openTinLayer(string fullPath)  
        {  
            ITinWorkspace pTinWorkspace;  
            IWorkspace pWS;  
            IWorkspaceFactory pWSFact = new TinWorkspaceFactoryClass();  
 
            ITinLayer pTinLayer = new TinLayerClass();  
 
            string pathToWorkspace = System.IO.Path.GetDirectoryName(fullPath);  
            string tinName = System.IO.Path.GetFileName(fullPath);  
            ITin pTin;  
 
            pWS = pWSFact.OpenFromFile(pathToWorkspace, 0);  
            pTinWorkspace = pWS as ITinWorkspace;  
 
            if (pTinWorkspace.get_IsTin(tinName))  
            {  
                pTin = pTinWorkspace.OpenTin(tinName);  
 
                pTinLayer.Dataset = pTin;  
 
                pTinLayer.ClearRenderers();  
 
                return pTinLayer as ILayer;  
 
 
            }  
            else 
            {  
                MessageBox.Show("该目录不包含Tin文件");  
                return null;  
 
            }  
 
 
        }  
        //测试例子 by gisoracle@126.com  
        private void button13_Click(object sender, EventArgs e)  
        {  
            ILayer pLayer = openTinLayer(@"D:\gisoracle\tin");  
            this.axMapControl1.AddLayer(pLayer);  
        }