MapsterMapper/Mapster
Mapster
Mapster 是一个 .NET 对象到对象映射器和高性能映射引擎，用于在不同对象模型之间转换数据。它作为类型安全的数据传输工具和 LINQ 查询投影工具，用于在内部逻辑和外部数据结构之间移动数据。
该引擎利用编译后的映射表达式和机器码来减少对象转换过程中的开销。它特别允许将可查询的数据源直接投影到目标类型中，以优化数据库检索。
该工具集涵盖了数据传输对象（DTO）生成、不可变数据转换和查询结果投影。它包括映射不可变集合、保留对象引用以及将运行时参数注入转换过程的功能。
Features
- Object-to-Object Mappers - Provides a high-performance engine for copying values between two different memory-resident object types.
- Automated Data Projection - Projects queryable data sources directly into target object shapes to reduce retrieved data volume.
- Query Projections - Translates mapping definitions directly into IQueryable expressions to filter and project data at the database level.
- Query Projections - Allows projecting queryable data sources directly into destination types to reduce database retrieval overhead.
- Query Projection Tools - Provides utilities to project queryable data sources into specific types, limiting retrieved columns to optimize performance.
- Expression Tree Compilation - Implements high-performance mapping by compiling expression trees into executable delegates to eliminate reflection overhead.
- Object Transformation Compilers - Utilizes compiled mapping expressions and machine code to maximize throughput during object conversions.
- .NET Object Mapping - Provides a specialized library for transferring data between object types within the .NET ecosystem.
- Runtime IL Emission - Generates optimized Common Intermediate Language at runtime to maximize throughput during object transformations.
- Data Transfer Object Mapping - Provides tools for mapping domain entities to data transfer objects to decouple internal logic from external schemas.
- Property Value Transformers - Allows definition of custom logic to determine destination property values based on one or more source properties.
- Dynamic Mapping Engines - Implements high-performance runtime code generation via IL to map objects with minimal overhead.
- Immutable Data Mapping - Transforms data into read-only lists, dictionaries, or sets to ensure destination immutability.
- Mapper Code Generation - Creates mapper classes at compile time to ensure type safety and increase execution speed during data transfers.
- Type-Safe Mapping Generation - Generates data transfer objects and mapping logic to ensure type safety at compile time.
- Reference Tracking - Tracks object identities during mapping to preserve shared references and prevent circular dependency loops.
- Fluent Configuration APIs - Provides a fluent API for defining type transformation rules through a chainable method interface.
- Mapping Caches - Optimizes transformation throughput by caching and reusing compiled mapping functions.
- Object Reference Mapping - Tracks and reuses existing object references during mapping to prevent duplicate objects in the target graph.
- Core .NET Libraries - High-performance, lightweight object-to-object mapping library.
- Object Mapping - High-performance object mapping library for .NET.
