Expression tree
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Expression trees represent code in a tree-like data structure where each node is an expression. This enables dynamic modification of executable code, execution of LINQ queries in various databases, and creation of dynamic queries. Expression trees can be compiled into executable code using the Expression<TDelegate>.Compile() method.
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Expression tree
- 2. Expression tree Expression trees represent code in a tree-like data structure, where each node is an expression. This enables dynamic modification of executable code, the execution of LINQ queries in various databases, and the creation of dynamic queries.
- 3. Lambda Statement lambda (x, y) => { return x + y; } Expression lambda (x, y) => x + y
- 4. Lambda Expression Using the System.Linq.Expressions namespace Expression<Func<int, bool>> expr = n => n > 5;
- 5. Expression<TDelegate>.Compile Compile the expression tree into executable code. Expression<Func<int, bool>> expr = n => n > 5; Func<int, bool> deleg = expr.Compile(); deleg(3);
- 6. Expression<Func<int, bool>> n => n > 5 Body : BinaryExpression n > 5 Left : Expression n Right : Expression 5 NodeType : ExpressionType GreaterThan NodeType : ExpressionType Lambda ReturnType : Type Boolean
- 8. BinaryExpression BinaryExpression binaryExpr = Expression.GreaterThan(iParam, constantExpr); > n 5 λ
- 9. ConstantExpression ConstantExpression constantExpr = Expression.Constant(5, typeof(int)); > n 5 λ
- 10. LambdaExpression Expression<Func<int, bool>> expr = Expression.Lambda<Func<int, bool>>(binaryExpr, iParam); > n 5 λ
- 11. Reference Expression Tree - MSDN https://msdn.microsoft.com/en-us/library/bb397951.aspx
Editor's Notes
- #6: https://msdn.microsoft.com/zh-tw/library/bb361179(v=vs.110).aspx