expression tree
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Expression Tree drake
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Expression Tree presented by Drake @20121207
Transcript of expression tree
Expression Tree
drake
Expression
• 3• a• !a• a+b• Math.Sin(a)• new StringBuilder()
Expression
• 3 ConstantExpression• aParameterExpression• !aUnaryExpression• a+bBinaryExpression• Math.Sin(a)MethodCallExpression• new StringBuilder()NewExpression
Summary
• 運算式的一個重要的特點就是它可以無限地組合,只要符合正確的類型和語義
• +可以用於各類數數值型別的加法,那麼加號的左右就可以是任何類型為相應數值的表達式
Example
• a + 2 + 3• (a + 2) => b, (b+3)
Example
• Math.Sin(a) + 3
Expression
• System.Linq.Expressions1+2+3
Usage
System.Linq.Expressions.Expression
Expressioin
• Math.Sin(a)
Usage
Lambda Expression
• (parameters) => expression
Usage
InvocationExpression
Usage
Expression.OrElse Method
Usage
Using PredicateBuilder
PredicateBuilder Source Code
• Thank you for your listening!