unity 4 Please check your configuration file and verify this type name.

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The problem is in you config file. You are mixing two concepts with some incorrect syntax.

The <assembly... /> and <namespace ... /> nodes provide an assembly and namespace search order when your <register ... /> node contains a type that cannot be found by itself. If a type cannot be found, it searches through all combinations of [namespace].Type, [assembly]. Here‘s where the error is: it does NOT search for Type, [assembly]. If any <namespace ... /> nodes are defined, it does NOT try appending only the assembly.

So your <register type="Biblioteca.Contracts.IManterCategoriaBO" mapTo="Biblioteca.Business.ManterCategoriaBO" /> node has the type Biblioteca.Contracts.IManterCategoriaBO which does not contain the assembly, so it cannot be found. Therefore, it needs to do a search. You did specify <namespace ... /> nodes, so it will first tryBiblioteca.Biblioteca.Contracts.IManterCategoriaBO, Biblioteca. Notice the duplicate Biblioteca name.

Here‘s a corrected config file.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration" />
  </configSections>
  <unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
    <assembly name="Biblioteca" />
    <assembly name="Biblioteca.Contracts" />
    <assembly name="Biblioteca.Business" />
    <namespace name="Biblioteca" />
    <namespace name="Biblioteca.Contracts" />
    <namespace name="Biblioteca.Business" />
    <container>
      <register type="IManterCategoriaBO" mapTo="ManterCategoriaBO" />
      <!-- Or this works -->
      <!--<register type="Biblioteca.Contracts.IManterCategoriaBO, Biblioteca" mapTo="Biblioteca.Business.ManterCategoriaBO, Biblioteca" />-->
    </container>
  </unity>
</configuration>

unity 4 Please check your configuration file and verify this type name.

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原文地址：http://www.cnblogs.com/rongfengliang/p/5483274.html