Question

C#怎样通过url调用接口

Answer 1

web 接口,常用的请求方式有两种

1. GET

2. POST

   
   

public static class Http
{
    private static Encoding GetEncoding(HttpWebResponse response)
    {
        var encodingText = response.ContentEncoding;
        if (string.IsNullOrEmpty(encodingText))
            encodingText = "UTF-8";

        return Encoding.GetEncoding(encodingText);
    }
    private static string JoinParam(IDictionary<string, string> input)
    {
        var sb = new StringBuilder();
        using (var e = input.GetEnumerator())
        {
            if (e.MoveNext())
            {
                var key = HttpUtility.UrlEncode(e.Current.Key);
                var value = HttpUtility.UrlEncode(e.Current.Value);
                sb.AppendFormat("{0}={1}", key, value);
                while (e.MoveNext())
                {
                    key = HttpUtility.UrlEncode(e.Current.Key);
                    value = HttpUtility.UrlEncode(e.Current.Value);
                    sb.AppendFormat("&{0}={1}", key, value);
                }
            }
        }
        return sb.ToString();
    }

    public static string PostStream(string url, IDictionary<string, string> header = null, Stream stream = null, Encoding encoding = null)
    {
        var request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = WebRequestMethods.Http.Post;
        if (header != null)
        {
            foreach (var key in header.Keys)
            {
                var value = header[key];
                switch (key)
                {
                    case "Content-Type":
                        request.ContentType = value;
                        break;
                    case "Content-Length":
                        request.ContentLength = Convert.ToInt64(value);
                        break;
                    default:
                        request.Headers.Set(key, value);
                        break;
                }
            }
        }
        if (stream != null)
        {
            request.ContentLength = stream.Length;
            using (var rStream = request.GetRequestStream())
            {
                stream.CopyTo(rStream);
            }
        }
        using (var response = (HttpWebResponse)request.GetResponse())
        {
            using (var rStream = response.GetResponseStream())
            {
                if (encoding == null)
                {
                    encoding = GetEncoding(response);
                }
                using (var reader = new StreamReader(rStream, encoding))
                    return reader.ReadToEnd();
            }
        }
    }
    public static string Post(string url, IDictionary<string, string> header = null, IDictionary<string, string> input = null)
    {
        Stream dst = null;
        if (input != null)
        {
            var str = JoinParam(input);
            var bytes = Encoding.UTF8.GetBytes(str);
            dst = new MemoryStream(bytes);
        }

        var result = PostStream(url, header, dst);
        dst?.Dispose();
        return result;
    }
    public static string Get(string url, IDictionary<string, string> header = null, IDictionary<string, string> input = null)
    {
        var request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = WebRequestMethods.Http.Get;
        if (header != null)
        {
            foreach (var key in header.Keys)
                request.Headers[key] = header[key];
        }
        if (input != null)
        {
            url += "?" + JoinParam(input);
        }
        using (var response = (HttpWebResponse)request.GetResponse())
        {
            using (var rStream = response.GetResponseStream())
            {
                var encoding = GetEncoding(response);
                using (var reader = new StreamReader(rStream, encoding))
                    return reader.ReadToEnd();
            }
        }
    }
}

提供了两种方式的请求实现。

示例：

var kvParam = new Dictionary<string, string>();
kvParam["name"] = "xxx";
kvParam["password"] = "xxx";
var result = Http.Post("http://www.xxx.com/login.php", null, kvParam);