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IVsSolutionEvents.OnQueryUnloadProject Method

Queries listening clients as to whether the project can be unloaded.

Namespace: Microsoft.VisualStudio.Shell.Interop
Assembly: Microsoft.VisualStudio.Shell.Interop (in

int OnQueryUnloadProject (
	[InAttribute] IVsHierarchy pRealHierarchy,
	[InAttribute] out int pfCancel
int OnQueryUnloadProject (
	/** @attribute InAttribute() */ IVsHierarchy pRealHierarchy, 
	/** @attribute InAttribute() */ /** @attribute OutAttribute() */ /** @ref */ int pfCancel
JScript does not support passing value-type arguments by reference.



[in] Pointer to the IVsHierarchy interface of the project to be unloaded.


[out] true if the client vetoed unloading the project. false if the client approved unloading the project.

Return Value

If the method succeeds, it returns S_OK. If it fails, it returns an error code.

COM Signature

From vsshell.idl:

HRESULT IVsSolutionEvents::OnQueryUnloadProject(
   [in] IVsHierarchy *pRealHierarchy,
   [in,out] BOOL *pfCancel