C# C从NameValueCollection过帐值

如何获取NameValueCollection值帖子的内容长度

我正在添加内容长度标题，但不知道该放什么

public static string Post (string url, NameValueCollection formData)
{
    string response;
    int length = formData.???

    using (WebClient webClient = new WebClient())
    {
        webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
        webClient.Headers.Add ("Content-Length", length);
        byte[] responseBytes = webClient.UploadValues (url, "POST", formData);
        response = Encoding.UTF8.GetString (responseBytes);
    }

    return response;
}

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您不能在WebClient上设置该属性。UploadValues应为您设置该属性。根据，您不能使用WebClient设置内容长度标题。