没有Moq的情况下如何在C＃中实例化FormFile的实例？

问题描述

我想通过集成测试来测试将文件附加到RavenDB数据库中的文档的功能。为此，我需要一个 IFormFile 的实例。

I want to test a function that attaches files to documents in a RavenDB database with an integration test. For this, I need an instance of IFormFile.

显然，我无法从接口实例化，所以我尝试实例化继承自 IFormFile 接口。

Obviously, I can't instantiate from an interface so I tried to instantiate an instance of FormFile which inherits from the IFormFile interface.

using (var stream = File.OpenRead("placeholder.pdf"))
{
    var file = new FormFile(stream, 0, stream.Length, null, Path.GetFileName(stream.Name))
    {
        ContentType = "application.pdf"
    };
}

但这会引发以下错误：

System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.AspNetCore.Http.Internal.FormFile.set_ContentType(String value)

何时我从代码中删除了 ContentType = application.pdf ，它允许我实例化一个新实例，但没有 ContentType 。

When I remove the ContentType = "application.pdf" from the code it allows me to instantiate a new instance but without a ContentType.

如何使用 ContentType FormFile 的实例c>是否没有 Moq 框架？

How do I instantiate an instance of FormFile with the ContentType and without the Moq framework?

推荐答案

感谢Hans his评论，实际答案是：

Thanks to Hans his comment, the actual answer is:

using (var stream = File.OpenRead("placeholder.pdf"))
{
    var file = new FormFile(stream, 0, stream.Length, null, Path.GetFileName(stream.Name))
    {
        Headers = new HeaderDictionary(),
        ContentType = "application/pdf"
    };
}

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