csharp / expert
Snippet
Dynamic Query Compilation via Expression Trees
Expression trees represent code in a tree-like data structure, where each node is an expression. Expert developers use this for metaprogramming, such as building dynamic LINQ providers or compiling highly optimized logic at runtime that would otherwise require slow reflection.
snippet.cs
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ParameterExpression param = Expression.Parameter(typeof(int), "x");BinaryExpression body = Expression.GreaterThan(param, Expression.Constant(10));Expression<Func<int, bool>> lambda = Expression.Lambda<Func<int, bool>>(body, param);Func<int, bool> compiled = lambda.Compile();bool result = compiled(15);
Breakdown
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Expression.Lambda<Func<int, bool>>(body, param);
Defines the signature and logic of the anonymous function.
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lambda.Compile();
Triggers the JIT compiler to turn the expression tree into executable IL code.