.Net单元测试编译错误 – 类型或方法有2个通用参数,但提供了1个通用参数

2019年8月1日 175次阅读

我们有一个泛型类,它包含一个使用外部类的泛型类型参数的私有类.例：

public class Foo<T>
{
  private class Bar : IGrouping<Guid,T>{


  }
}

问题是我们在单元测试项目中遇到编译错误

“The Type or method has 2 generic parameter(s), but 1 generic argument(s) were provided. A generic argument must be provided for each generic parameter.”

  我加快了MSBuild的详细程度(工具>选项>项目和解决方案>构建和运行).查看错误位置,它指向Microsoft.TeamTest.targets文件.我能够将它缩小到上面的这个类结构.如果我用类定义中的具体泛型参数替换私有类Bar(见下文),单元测试编译正常：

private class Bar : IGrouping<Guid,int>{

}

我需要提供第二个泛型参数generic来接受outter类中的任何类型.关于这个的想法？

为了澄清,编译错误在单元测试项目中,而不是上面列出的代码(编译正常).私有访问器代可能在MS单元测试基础设施中窒息？

这是[几乎]整个实际代码：

public class CategoryStorageService<T> : StorageServiceBase<T>, ICategoryStorageService<T> where T : IStorageContent, new()
{
    /// <summary>
    /// Returns a nested object graph of category-items
    /// </summary>
    /// <param name="categories"></param>
    /// <returns></returns>
    public IEnumerable<IGrouping<StorageCategory, T>> GetContent(params StorageCategory[] categories)
    {
        var results = this.GetContent(categories.Select(c => c.ID).ToArray());
        foreach (var result in results)
        {
            yield return new LocalNameGrouping(
                categories.First(c => c.ID == result.Key.ID),
                result);
        }
    }

    /// <summary>
    /// Returns a nested object graph of categories, each containing their items
    /// </summary>
    /// <param name="categories">The ID(s) of the category(ies) to fetch</param>
    /// <returns></returns>
    private IEnumerable<IGrouping<StorageCategory, T>> GetContent(params Guid[] categories)
    {

        // implementation removed

        return null;
    }      

    private class LocalNameGrouping : IGrouping<StorageCategory, T>
    {
        private IEnumerable<T> items;
        private StorageCategory category;

        public LocalNameGrouping(StorageCategory localCategory, IGrouping<StorageCategory, T> items)
        {
            this.items = items;
            string name = string.IsNullOrEmpty(localCategory.DisplayName) ? items.Key.DisplayName : localCategory.DisplayName;
            this.category = new StorageCategory { DisplayName = name, ID = items.Key.ID };
        }

        #region IGrouping<StorageCategory,T> Members

        public StorageCategory Key
        {
            get { return category; }
        }

        #endregion

        #region IEnumerable<T> Members

        public IEnumerator<T> GetEnumerator()
        {
            return items.GetEnumerator();
        }

        #endregion

        #region IEnumerable Members

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            return this.GetEnumerator();
        }

        #endregion
    }

最佳答案 因此私有访问器处理对于部分构造泛型类定义的类型感到愤怒.例如,如果类声明如下,则失败：

private class LocalNameGrouping : IGrouping<StorageCategory, T> { 

}

然而,它对此很满意,仍然满足了需要(尽管有点俗气)：

private class LocalNameGrouping<K> : IGrouping<K, T> where K: StorageCategory, new()
{

}
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