如何在ASP.NET Core中修改HttpContext.Request.Form [英] How to modify HttpContext.Request.Form in asp.net core

问题描述

我有一个HttpContext.Request对象，该对象的Form数据有误，我想对其进行修复，并以正确的方式发送正确的HttpContext. HttpContext.Request.Form是只读的，但是如果不是，我将简单地执行以下操作； HttpContext.Request.Form ["a"] ="a的正确值";

I have an HttpContext.Request object that has data in the Form that is wrong and I want to fix it up and send the correct HttpContext on its way. HttpContext.Request.Form is readonly, but if it wasn't I would have simply done the following; HttpContext.Request.Form["a"] = "the correct value for a";

因此，在管道中执行此操作的最佳位置在哪里. 是否可以通过反射访问HttpContext.Request.Form写操作?

So, where is the best place in the pipeline to do this. Is it possible to make the HttpContext.Request.Form write accessable via reflection?

推荐答案

这比我想象的要容易.我正在我的中间件中执行此操作，该中间件可以纠正输入的错误表格数据.

This was easier than I thought. I am doing this in my middleware which is there to correct bad form data that came in.

public async Task Invoke(HttpContext context)
{
    ....
    NameValueCollection fcnvc = context.Request.Form.AsNameValueCollection();
    fcnvc.Set("a", "the correct value of a");
    fcnvc.Set("b", "a value the client forgot to post");
    Dictionary<string, StringValues> dictValues = new Dictionary<string, StringValues>();
    foreach (var key in fcnvc.AllKeys)
    {
      dictValues.Add(key, fcnvc.Get(key));
    }
    var fc = new FormCollection(dictValues);
    context.Request.Form = fc;
    ....
    await _next.Invoke(context);
}

有趣的是，FormCollection是只读的，但是HttpContext.Request对象不允许我替换整个Form.

Interestingly the FormCollection is readonly, but the HttpContext.Request object is not thus allowing me to replace the entire Form.

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