[in] A string describing the version of the CLR you want to load.
A version number in the .NET Framework consists of four parts separated by periods: major.minor.build.revision. The string passed as pwszVersion must start with the character "v" followed by the first three parts of the version number (for example, "v1.0.1529").
Some versions of the CLR are installed with a policy statement that specifies compatibility with previous versions of the CLR. By default, the startup shim evaluates pwszVersion against policy statements and loads the latest version of the runtime that is compatible with the version being requested. A host can force the shim to skip policy evaluation and load the exact version specified in pwszVersion by passing a value of STARTUP_LOADER_SAFEMODE for the flags parameter, as described below.
If the caller specifies null for pwszVersion, the latest version of the runtime is loaded. Passing null gives the host no control over which version of the runtime is loaded. Although this approach may be appropriate in some scenarios, it is strongly recommended that the host supply a specific version to load.
[in] A string that specifies whether to load the server or the workstation build of the CLR. Valid values are svr and wks. The server build is optimized to take advantage of multiple processors for garbage collections, and the workstation build is optimized for client applications running on a single-processor machine.
If pwszBuildFlavoris set to null, the workstation build is loaded. When running on a single-processor machine, the workstation build is always loaded, even if pwszBuildFlavoris set to svr. However, if pwszBuildFlavoris set to svr and concurrent garbage collection is specified (see the description of the flags parameter), the server build is loaded.
[in] The CLSID of the coclass that implements the ICorRuntimeHost interface. Supported values are CLSID_CorRuntimeHostor CLSID_CLRRuntimeHost.
[in] The IID of the requested interface from rclsid. Supported values are IID_ICorRuntimeHost or IID_ICLRRuntimeHost.
If pwszVersion specifies a runtime version that does not exist, CorBindToRuntimeEx returns an HRESULT value of CLR_E_SHIM_RUNTIMELOAD.
Execution Context and Flow of Windows Identity
In version 1 of the CLR, the WindowsIdentity object does not flow across asynchronous points such as new threads, thread pools, or timer callbacks. In version 2.0 of the CLR, an ExecutionContext object wraps some information about the currently executing thread and flows it across any asynchronous point, but not across application domain boundaries. Similarly, the WindowsIdentity object also flows across any asynchronous point. Therefore, the current impersonation on the thread, if any, flows too.
By changing the process default mode to the version 1 compatibility mode, where the WindowsIdentity object does not flow across any asynchronous point, regardless of the ExecutionContext settings on the current thread. How you change the default mode depends on whether you use a managed executable or an unmanaged hosting interface to load the CLR: