unity, asset operations

//----create asset

//ref: http://wiki.unity3d.com/index.php?title=CreateScriptableObjectAsset
CmyScriptableObject asset = ScriptableObject.CreateInstance<CmyScriptableObject> ();

AssetDatabase.CreateAsset (asset, path);

AssetDatabase.SaveAssets ();
AssetDatabase.Refresh();
EditorUtility.FocusProjectWindow ();
Selection.activeObject = asset;

//----create a scriptable object and add it to an existing asset
CmyScriptableObject obj = ScriptableObject.CreateInstance<CmyScriptableObject> ();
AssetDatabase.AddObjectToAsset(obj,existingAsset);

// Reimport the asset after adding an object.
// Otherwise the change only shows up when saving the project
AssetDatabase.ImportAsset(AssetDatabase.GetAssetPath(obj));

Selection.activeObject = obj;

//----remove object in asset

//ref : http://answers.unity3d.com/questions/219465/how-can-i-remove-an-object-from-an-asset.html
UnityEngine.Object.DestroyImmediate(obj, true);

　　　　　　　　　　　　//save

　　　　　　 AssetDatabase.SaveAssets();

//----get subasset of certain class type

CmyScriptableObject obj = AssetDatabase.LoadAssetAtPath<CmyScriptableObject> (path);

//----get all objects(sub assets) from assets

//ref: http://answers.unity3d.com/questions/1066162/how-do-i-return-the-path-of-a-sub-asset-in-an-asse.html
//suppose asset have objects(sub assets) attached to it

UnityEngine.Object[] allassets = AssetDatabase.LoadAllAssetsAtPath(AssetDatabase.GetAssetPath(asset));
int assetCount=allassets.Length;
Debug.Log("assetCount:"+assetCount);
for(int i=0;i<assetCount;i++){
UnityEngine.Object _asset=allassets[i];
Debug.Log(_asset.name);
}

//----save asset

//if only want save the specified asset, use:

EditorUtility.SetDirty (asset);

//if want save all assets, use:

AssetDatabase.SaveAssets ();

//----rename asset

string errorMessage=AssetDatabase.RenameAsset(AssetDatabase.GetAssetPath(asset),"new name");
if(errorMessage.Length==0){
Debug.Log("rename asset succ");
}else{
Debug.Log("rename asset failed: "+errorMessage);
}

//----rename subasset

CmyScriptableObject subAsset = AssetDatabase.LoadAssetAtPath<CmyScriptableObject> (AssetDatabase.GetAssetPath(asset));
subAsset.name = "new name";

//----hide subasset in Assets folder

//ref: http://answers.unity3d.com/questions/210726/how-to-hide-files-in-project-directory.html
CmyScriptableObject subAsset = AssetDatabase.LoadAssetAtPath<CmyScriptableObject> (AssetDatabase.GetAssetPath(asset));
subAsset.hideFlags = HideFlags.HideInHierarchy;