Linq to SQL Where Extension Method Question?

The variable type Expression table. NumLegs > 3); // or to be more explicit: theMethod((Table table) => table. NumLegs > 3); // or... theMethod(delegate(Table table) { return table.

NumLegs > 3; } ) Here's how you'd write your own method that takes one as a parameter and applies it to a L2S query: IQueryable addWhereClause( IQueryable tables, Expression> whereClause) { return tables. Where(whereClause); }.

The variable type Expression> means it takes a code expression representing a method/delegate/lambda expression that takes a Table parameter and returns a bool. A method that takes an Expression parameter intends to parse the code to generate other code rather than evaluating the Expression itself. LINQ to SQL can use them to generate SQL code to do what your code represents.

The strange thing about Expression parameters is that you pass values into them the same way that you'd pass a lambda expression, but whether your value is interpreted as an Expression or a lambda depends on the signature of the method you're passing it into. Here's an example of passing an Expression> into a method (which looks the same as passing a Func parameter: theMethod(table => table. NumLegs > 3); // or to be more explicit: theMethod((Table table) => table.

NumLegs > 3); // or... theMethod(delegate(Table table) { return table. NumLegs > 3; } ); Here's how you'd write your own method that takes one as a parameter and applies it to a L2S query: IQueryable addWhereClause( IQueryable tables, Expression> whereClause) { return tables. Where(whereClause); }.

1..for addWhereClause method – Misnomer Jan 10 at 17:20 Excellent work. If I could vote you up more than once, I would do so. – Randy Minder Jan 10 at 18:33.

I am just providing a simple explanation for how expressions work. From the sample code in the example given here is an example - System.Linq.Expressions. Expression> expr = I => I deleg2 = expr.Compile(); // Invoke the method and print the output.Console.

WriteLine("deleg2(4) = {0}", deleg2(4)); //OUTPUT : deleg2(4) = True So in simple words say you have a function that returns true if no deleg = I => I expr = I => I c e= new List(); e. Add(new Employee(1,"ABC",5000)); e. Add(new Employee(2,"ACC",5000)); e.

Add(new Employee(3,"ADC",50009)); System.Linq.Expressions. Expression> expr =e => e. Salary Where(expr);//give all employee with salary.

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