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本书内容是关于 .NET 相依性注入（dependency injection；简称 DI）的相关议题。透过本书，您将会了解：

什么是 DI、它有什么优点、何时使用 DI、以及可能碰到的陷阱。
如何运用 DI 应付容易变动的软件需求，设计出更弹性、更好维护的程序代码。
与 DI 有关的设计模式。
DI 于 .NET 应用程序中的实务应用，包括 ASP.NET MVC、ASP.NET Web API 等等。
如何使用 DI 容器（例如 Unity）来协助开发应用程序。

本书的范例皆以 C# 撰写，读者无须具备任何 DI 背景知识。

建议您先读完本书的试阅章节（包含本书第一章完整内容），以评估这本书是否适合你。

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