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Expression Tree presented by Drake @20121207
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expression tree
1.
Expression Tree
drake
2.
Expression •
3 • a • !a • a+b • Math.Sin(a) • new StringBuilder()
3.
Expression •
3 ConstantExpression • aParameterExpression • !aUnaryExpression • a+bBinaryExpression • Math.Sin(a)MethodCallExpression • new StringBuilder()NewExpression
4.
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
5.
Example • a+2+3 • (a
+ 2) => b, (b+3)
6.
Example • Math.Sin(a) +
3
7.
Expression • System.Linq.Expressions
1+2+3
8.
Usage System.Linq.Expressions.Expression
9.
Expressioin • Math.Sin(a)
10.
Usage
11.
Lambda Expression • (parameters)
=> expression
12.
Usage
13.
InvocationExpression
14.
Usage
15.
Expression.OrElse Method
16.
Usage
17.
Using PredicateBuilder
18.
PredicateBuilder Source Code
19.
• Thank you
for your listening!
Editor's Notes
NewArrayExpression, ConditionExpression
http://msdn.microsoft.com/en-us/library/bb506649.aspx
http://www.albahari.com/nutshell/predicatebuilder.aspx
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