14 lines
1.4 KiB
Markdown
14 lines
1.4 KiB
Markdown
# ExpressionHelpers
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LINQ expression tree serialization and deserialization to JSON, enabling expression transport over SignalR or HTTP. Converts `Expression` trees to a recursive `AcExpressionNode` DTO and back, supporting binary, unary, lambda, member access, method calls, conditionals, new/member-init, and array expressions.
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## Key Files
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- **`AcExpressionNode.cs`** -- Universal DTO representing any expression node. Includes `ParameterNode` and `MemberBindingNode` supporting types. Recursively models the full expression tree and is JSON-serializable.
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- **`AcExpressionHelper.cs`** -- Static facade for serializing/deserializing expressions and `IQueryable` query trees. Provides `ExpressionToJson`, `ExpressionFromJson`, `QueryToJson`, and `ApplyQueryFromJson` methods.
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- **`AcExpressionSerializerVisitor.cs`** -- `ExpressionVisitor` subclass that walks an expression tree and builds the `AcExpressionNode` graph using a stack-based approach. Handles closure variable evaluation and constant serialization.
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- **`AcExpressionDeserializer.cs`** -- Reconstructs `Expression` trees from `AcExpressionNode` DTOs. Resolves types, parameters, methods, and member bindings. Handles nullable type mismatches in binary expressions.
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---
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> **LLM Maintenance:** If you modify code in this folder, update this README to reflect the changes. If you notice the README content does not match the current code, automatically update the README to match the code.
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