In my app I have a fair number of entities which have fields which are getting their values set via reflection. (In this case NHibernate is setting them). I'd like to get rid of the "x is never assigned to and will always have its default value 0" warnings, so I can more easily pick out the other warnings. I realize you can surround them in pragma directives, but AFAIK you have to do this for each one. Is there a project wide or solution wide way I could do this?
Use the C# commandline option /nowarn http://msdn.microsoft.com/en-us/library/7f28x9z3(VS.80).aspx
To do this within visual studio goto Project properties->Build->(Errors and warnings) Suppress Warnings and then specify a comma separated list of warnings which need to be suppressed.
Open the project properties, on the build tab, enter warning IDs you want to surpress in the Suppress warnings: box.
The VC++ XML tag for this is <DisableSpecificWarnings/> with a semi-colon separated list of numeric IDs. This doesn't appear to be documented anywhere that I can see but FYI.
来源：https://stackoverflow.com/questions/526443/globally-suppress-c-sharp-compiler-warnings