如何在asp.net内核的中间件中修改表单和查询字符串值？

public class ModifyFormAndQueryMiddleware : IMiddleware
{
    public async Task InvokeAsync(HttpContext context, RequestDelegate next)
    {
        // 获取表单和查询字符串的集合
        var formCollection = await context.Request.ReadFormAsync();
        var queryCollection = context.Request.Query;

        // 修改表单和查询字符串的值
        formCollection["field1"] = "new value";
        queryCollection["param1"] = "new value";

        // 将修改后的表单和查询字符串重新赋值给Request对象
        context.Request.Form = formCollection;
        context.Request.QueryString = QueryString.Create(queryCollection);

        // 调用下一个中间件或处理程序
        await next(context);
    }
}