【C#表达式树 四】Expression类上的函数列表

Expression相当于工厂，这个工厂有各式各样的模型（函数），用来生成各种零部件（节点类型），最后组装成表达式树。

 Expressions这个命名空间有各种个容器用陈放生产出来的零部件。

Expression 非常接近于类型Emit ，Emit就是直接 使用IL指令进行编程，它的最主要用途就是编译一个动态方法 ，恰好Expression 的主要作用

也是如此 ，可以把Expression编程看作是对Emit的一个简单的基于oo的封装，它们直接针对的更低层语言(IL)的接口，比如 Expression里面

没有while,for foreach,等种种循环，就是一个Expression.Loop(...) 就完了，类似还有Block 这个也有传入传出，和方法相似

 

列表中每个名字其实对应着一组函数（130个），这些函数函数有些有多重载（330个），但返回值的类型是一样的。

这些工厂方法所生成的表达式的意义应该说还是很直观的，就不特别介绍了。经常跟编译器打交道的话应该对这些名字尤其熟悉。

下一节我们开始使用这些函数创建表达式树节点

函数功能	返回值类型
Add	BinaryExpression
AddAssign	BinaryExpression
AddAssignChecked	BinaryExpression
AddChecked	BinaryExpression
And	BinaryExpression
AndAlso	BinaryExpression
AndAssign	BinaryExpression
ArrayIndex	BinaryExpression
Assign	BinaryExpression
Coalesce	BinaryExpression
Divide	BinaryExpression
DivideAssign	BinaryExpression
Equal	BinaryExpression
ExclusiveOr	BinaryExpression
ExclusiveOrAssign	BinaryExpression
GreaterThan	BinaryExpression
GreaterThanOrEqual	BinaryExpression
LeftShift	BinaryExpression
LeftShiftAssign	BinaryExpression
LessThan	BinaryExpression
LessThanOrEqual	BinaryExpression
MakeBinary	BinaryExpression
Modulo	BinaryExpression
ModuloAssign	BinaryExpression
Multiply	BinaryExpression
MultiplyAssign	BinaryExpression
MultiplyAssignChecked	BinaryExpression
MultiplyChecked	BinaryExpression
NotEqual	BinaryExpression
Or	BinaryExpression
OrAssign	BinaryExpression
OrElse	BinaryExpression
Power	BinaryExpression
PowerAssign	BinaryExpression
ReferenceEqual	BinaryExpression
ReferenceNotEqual	BinaryExpression
RightShift	BinaryExpression
RightShiftAssign	BinaryExpression
Subtract	BinaryExpression
SubtractAssign	BinaryExpression
SubtractAssignChecked	BinaryExpression
SubtractChecked	BinaryExpression
Block	BlockExpression
TryGetActionType	bool
TryGetFuncType	bool
Catch	CatchBlock
MakeCatchBlock	CatchBlock
Condition	ConditionalExpression
IfThen	ConditionalExpression
IfThenElse	ConditionalExpression
Constant	ConstantExpression
ClearDebugInfo	DebugInfoExpression
DebugInfo	DebugInfoExpression
Default	DefaultExpression
Empty	DefaultExpression
Dynamic	DynamicExpression
MakeDynamic	DynamicExpression
ElementInit	ElementInit
Lambda<TDelegate>	Expression<TDelegate>
Break	GotoExpression
Continue	GotoExpression
Goto	GotoExpression
MakeGoto	GotoExpression
Return	GotoExpression
ArrayAccess	IndexExpression
MakeIndex	IndexExpression
Property	IndexExpression
Invoke	InvocationExpression
Label	LabelExpression
Label	LabelTarget
Lambda	LambdaExpression
ListInit	ListInitExpression
Loop	LoopExpression
Bind	MemberAssignment
Field	MemberExpression
MakeMemberAccess	MemberExpression
Property	MemberExpression
PropertyOrField	MemberExpression
MemberInit	MemberInitExpression
ListBind	MemberListBinding
MemberBind	MemberMemberBinding
ArrayIndex	MethodCallExpression
Call	MethodCallExpression
NewArrayBounds	NewArrayExpression
NewArrayInit	NewArrayExpression
New	NewExpression
Parameter	ParameterExpression
Variable	ParameterExpression
RuntimeVariables	RuntimeVariablesExpression
SwitchCase	SwitchCase
Switch	SwitchExpression
SymbolDocument	SymbolDocumentInfo
MakeTry	TryExpression
TryCatch	TryExpression
TryCatchFinally	TryExpression
TryFault	TryExpression
TryFinally	TryExpression
GetActionType	Type
GetDelegateType	Type
GetFuncType	Type
TypeEqual	TypeBinaryExpression
TypeIs	TypeBinaryExpression
ArrayLength	UnaryExpression
Convert	UnaryExpression
ConvertChecked	UnaryExpression
Decrement	UnaryExpression
Increment	UnaryExpression
IsFalse	UnaryExpression
IsTrue	UnaryExpression
MakeUnary	UnaryExpression
Negate	UnaryExpression
NegateChecked	UnaryExpression
Not	UnaryExpression
OnesComplement	UnaryExpression
PostDecrementAssign	UnaryExpression
PostIncrementAssign	UnaryExpression
PreDecrementAssign	UnaryExpression
PreIncrementAssign	UnaryExpression
Quote	UnaryExpression
Rethrow	UnaryExpression
Throw	UnaryExpression
TypeAs	UnaryExpression
UnaryPlus	UnaryExpression
Unbox	UnaryExpression
CanReduce	bool
Reduce	Expression
NodeType	ExpressionType
Type	Type