C# Expression Confusion

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Hi, i have a problem with following declaration:

C#

T Single <T> ( Expression <Func<T, bool>> expression, params Expression <Func <T, object>>[] includes ) where T : class;

Now i get it that T is a generic type but what i don't get are the "Expression" and "params" data types. Googling about them came up with nothing. Any explanation about them is very welcome.

Thanks in advance.

Posted 22-Aug-13 2:48am

YourAverageCoder

Updated 22-Aug-13 2:51am

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[no name] 22-Aug-13 8:52am

http://msdn.microsoft.com/en-us/library/ms173144.aspx
http://msdn.microsoft.com/en-us/library/w5zay9db.aspx

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OriginalGriff · Accepted Answer · 2013-08-22T03:34:00

Neither the Expression or the params are datatypes: the former is similar to Func but returns a tree rather than a value (There is a good description here: http://stackoverflow.com/questions/793571/why-would-you-use-expressionfunct-rather-than-funct[^]).

params is a C# keyword that lets you specify a method parameter that takes a variable number of arguments. MSDN is your first resource here: http://msdn.microsoft.com/en-us/library/w5zay9db.aspx[^]