Modify help links to choose a more specific factory method

[zspitz]

Currently, (except for BinaryExpression and UnaryExpression which return the method based on the expression's NodeType) all factory methods which return the same object type as the node are displayed. For example, MemberExpression displays:

• Field
• MakeMemberAccess
• Property
• PropertyOrField

It might be better to show only the specific method that applies to this node, duplicating the logic of the factory methods formatter.

OTOH, as long as there aren't too many, it might be better to show all these possibilities.

[zspitz]

Useful LINQPad query:

var groups = typeof(System.Linq.Expressions.Expression).GetMethods()
    .Where(x => x.IsStatic)
    .GroupBy(
        x => x.ReturnType.Name,
        (key, grp) => grp.GroupBy(
            x => x.Name, 
            (name, innerGrp) => (key, name, string.Join(", ", innerGrp.Select(mthd => mthd.GetParameters().Length).OrderBy(x => x)))
        ).OrderBy(x => x.Item1)
    );
foreach (var grp in groups.Where(x => x.First().Item1 is not "BinaryExpression" and not "UnaryExpression")) {
    grp.Dump();
}

NewExpression

New

1, 1, 2, 2, 3, 3

ParameterExpression	Parameter	1, 2
ParameterExpression	Variable	1, 2

RuntimeVariablesExpression

RuntimeVariables

1, 1

SwitchCase

SwitchCase

2, 2

SwitchExpression

Switch

2, 3, 4, 4, 5, 5

SymbolDocumentInfo

SymbolDocument

1, 2, 3, 4

TryExpression	TryFault	2
TryExpression	TryFinally	2
TryExpression	TryCatch	2
TryExpression	TryCatchFinally	3
TryExpression	MakeTry	5

TypeBinaryExpression	TypeIs	2
TypeBinaryExpression	TypeEqual	2

LoopExpression

Loop

1, 2, 3

MemberAssignment

Bind

2, 2

MemberExpression	Field	2, 2, 3
MemberExpression	Property	2, 2, 2, 3
MemberExpression	PropertyOrField	2
MemberExpression	MakeMemberAccess	2

MemberInitExpression

MemberInit

2, 2

MemberListBinding

ListBind

2, 2, 2, 2

MemberMemberBinding

MemberBind

2, 2, 2, 2

MethodCallExpression	Call	2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 6
MethodCallExpression	ArrayIndex	2, 2

NewArrayExpression	NewArrayInit	2, 2
NewArrayExpression	NewArrayBounds	2, 2

IndexExpression	MakeIndex	3
IndexExpression	ArrayAccess	2, 2
IndexExpression	Property	3, 3, 3

InvocationExpression

Invoke

2, 2

LabelExpression

Label

1, 2

LabelTarget

Label

0, 1, 1, 2

Expression`1

Lambda

2, 2, 3, 3, 3, 4

LambdaExpression

Lambda

2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5

Type	GetFuncType	1
Type	GetActionType	1
Type	GetDelegateType	1

Boolean	TryGetFuncType	2
Boolean	TryGetActionType	2

ListInitExpression

ListInit

2, 2, 2, 2, 3, 3

BlockExpression

Block

1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 4, 5

CatchBlock	Catch	2, 2, 3, 3
CatchBlock	MakeCatchBlock	4

ConditionalExpression	Condition	3, 4
ConditionalExpression	IfThen	2
ConditionalExpression	IfThenElse	3

ConstantExpression

Constant

1, 2

DebugInfoExpression	DebugInfo	5
DebugInfoExpression	ClearDebugInfo	1

DefaultExpression	Empty	0
DefaultExpression	Default	1

IOrderedEnumerable<ValueTuple<String,String,String>> (1 item)
ElementInit	ElementInit	2, 2

DynamicExpression	Dynamic	3, 3, 3, 4, 5, 6
DynamicExpression	MakeDynamic	3, 3, 3, 4, 5, 6

GotoExpression	Break	1, 2, 2, 3
GotoExpression	Continue	1, 2
GotoExpression	Return	1, 2, 2, 3
GotoExpression	Goto	1, 2, 2, 3
GotoExpression	MakeGoto	4