问题
FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
Arguments: << path >> Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See http://go.microsoft.com/fwlink/?linkid=106663&Version=4.0.41108.0&File=mscorlib.dll&Key=FileSecurityState_OperationNotPermitted
The line of code above has an error [FileSecurityState_OperationNotPermitted]
回答1:
It sounds like your application is running in partial trust. To use a FileStream, you'll need to request elevated trust:
By default, Silverlight-based applications run in partial trust, which means they run within a security sandbox. Sandboxed applications have restricted access to the local computer and are constrained in other ways that help prevent malicious behavior.
From the Silverlight 4 FileStream documentation (emphasis mine):
When it is called by an elevated-trust application, exposes a Stream around a file, supporting both synchronous and asynchronous read and write operations.
EDIT: You can set an application to require elevated trust by setting the "Require elevated trust when running outside the browser" in your Silverlight project settings.
来源：https://stackoverflow.com/questions/2406216/silverlight-4-0-filestream