从流读取的字符串中获取特定值

Question

I have a string that was read from a stream using stream reader. This was after a WEB API call and get the response from the request. For a cleared view, here is my code.

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("SOME URL");
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

Stream resStream = response.GetResponseStream();
StreamReader reader = new StreamReader(resStream);

string s = reader.ReadToEnd();

resStream.Flush();
resStream.Close();
reader.Close();

My string (s) there have a value of "value1=sometring1&value2=somestring2". I want to get somestring1 and sometring2. I think there's a better way to do this and not convert the whole stream as a string to get each value. Do you have any ideas? Thanks!

Answer 1

I'd suggest reading into the string and afterwards splitting the data using a method like the following one:

private Dictionary<string, string> SplitValuePairString(string originalString)
{
    Dictionary<string, string> result = new Dictionary<string, string>();

    if (string.IsNullOrEmpty(originalString))
    {
        var keyValuePairs = originalString.Split(new char[] { '&' });

        foreach (string keyValuePair in keyValuePairs)
        {
            var parts = keyValuePair.Split(new char[] { '=' });

            if (parts.Length == 2)
            {
                result.Add(parts[0], parts[1]);
            }
        }
    }

    return result;
}

Answer 2

I think you can parse your string response with a Regex (if it always has this number of parameters, else you will have more results in the MatchCollection ) :

MatchCollection results = Regex.Matches(reader.ReadToEnd(), "=([a-z]*[0-9]*)");

string value1 = results[0].Groups[1].Value;
string value2 = results[1].Groups[1].Value;

This code returns exactly from the string "value1=sometring1&value2=somestring2" :

somestring1
somestring2

Answer 3

如果将流转换为string则可以使用System.Web.HttpUtility.ParseQueryString(s)轻松获取somestring1和sometring2