【C#表达式树 四】Expression类上的函数列表
2024-09-03 07:45:38
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 | |
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