One of the compelling features in C# 3.0 is the presentation of lambda expressions, cultivated out of the anonymous delegate (type-safe function pointers) support (don’t need to define a method somewhere else) that was present in C# 2.0. A lambda expression organizes with a left side composed of the arguments and a right expression which is the body of the method, split with a “=>”.
In the context of SPSecurity.RunWithElevatedPrivileges to encourage execution of a method with Full Control rights, it is common to see it as an anonymous method. For example, when using the SPUtility.SendEmail method it is ordinary to elevate rights. Using pre C# 3.0 mechanisms this would normally take on the form:
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SPSecurity.RunWithElevatedPrivileges(delegate
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{
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SPUtility.SendEmail(SPContext.Current.Site.OpenWeb(), false, false, "no_reply@sharepointsecurity.com", "this is my subject", "this is my body");
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});
This is a fair amount of real estate on the code surface. Wouldn’t it be nicer if we introduced a little bit of syntax sugar to tidy it up? This is where lambda expressions are accommodating. Taking the above method, this instead takes on the form:
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SPSecurity.RunWithElevatedPrivileges(() => SPUtility.SendEmail(SPContext.Current.Site.OpenWeb(), false, false, "no_reply@sharepointsecurity.com", "this is my subject", "this is my body"));
This is much cleaner, and required less typing!
December 4th, 2008 at 8:02 pm
[...] Take Advantage of Lambdas with RunWithElevatedPrivileges [...]
December 5th, 2008 at 2:05 am
And if your function doesn't have parameters, then just:
SPSecurity.RunWithElevatedPrivileges(SendEmail);