是否可以将 Request.Headers 与另一个列表相交？

Question

我正在尝试与标题列表相交：

var validHeaders = Request.Headers.ToArray().Intersect(ValidHeaders.List);

其中 ValidHeaders 定义为：

public static class ValidHeaders
{
    public static readonly IList<string> List = new ReadOnlyCollection<string>
    (new List<string>
    {
        "Content-Type",
        "DataServiceVersion",
        "MinDataServiceVersion",
        "Accept",
        "If-Match",
        "If-None-Match",
        "Prefer"
    });
}

如何将 HttpRequestHeaders 列表与另一个列表相交？

Answer 1

返回Key（头名）在ValidHeaders.List中找到的头的所有头及其值

var validHeaders = Request.Headers.Where(header => ValidHeaders.List.Any(k => string.Equals(k, header.Key, StringComparison.InvariantCultureIgnoreCase)));

这可以作为扩展方法添加到静态ValidHeader 类

public static class ValidHeaders {
    public static readonly IList<string> List = new ReadOnlyCollection<string>(new List<string>
    {
        "Content-Type",
        "DataServiceVersion",
        "MinDataServiceVersion",
        "Accept",
        "If-Match",
        "If-None-Match",
        "Prefer"
    });

    public static IEnumerable<KeyValuePair<string, IEnumerable<string>>> GetValidHeaders(this HttpRequestMessage request) {
        var validHeaders = request.Headers.Where(header => ValidHeaders.List.Any(k => string.Equals(k, header.Key, StringComparison.InvariantCultureIgnoreCase)));
        return validHeaders;
    }
}

使用过

var validHeaders = Request.GetValidHeaders();