我有同样的问题,但找不到答案,因此我花了一天时间让它工作。我在这里分享我的代码,我希望它能帮助该功能的其他人。
在 aspx 页面中使用以下代码获取 oAuth 访问权限
        protected void Page_Load(object sender, EventArgs e)
    {
        string oauth_token = Request.QueryString["oauth_token"];
        string oauth_verifier = Request.QueryString["oauth_verifier"];
        if (string.IsNullOrEmpty(oauth_token) || string.IsNullOrEmpty(oauth_verifier))
        {
            BeginAuthorization();
        }
        else
        {
            Authorize(oauth_token,oauth_verifier);
        }
    }
    private void Authorize(string oauth_token, string oauth_verifier)
    {
        var uri = new Uri(MagentoServer + "/oauth/token");
        string oauth_token_secret = (string)Session["oauth_token_secret"];
        OAuthBase oAuth = new OAuthBase();
        string nonce = oAuth.GenerateNonce();
        string timeStamp = oAuth.GenerateTimeStamp();
        string parameters;
        string normalizedUrl;
        string signature = oAuth.GenerateSignature(uri, ConsumerKey, ConsumerSecret,
        oauth_token,oauth_token_secret, "GET", timeStamp, nonce, OAuthBase.SignatureTypes.PLAINTEXT,
        out normalizedUrl, out parameters);
        StringBuilder sb = new StringBuilder("OAuth ");
        sb.AppendFormat("oauth_verifier=\"{0}\",", oauth_verifier);
        sb.AppendFormat("oauth_token=\"{0}\",", oauth_token);
        sb.AppendFormat("oauth_version=\"{0}\",", "1.0");
        sb.AppendFormat("oauth_signature_method=\"{0}\",", "PLAINTEXT");
        sb.AppendFormat("oauth_nonce=\"{0}\",", nonce);
        sb.AppendFormat("oauth_timestamp=\"{0}\",", timeStamp);
        sb.AppendFormat("oauth_consumer_key=\"{0}\",", ConsumerKey);
        sb.AppendFormat("oauth_signature=\"{0}\"", signature);
        var request = (HttpWebRequest)WebRequest.Create(uri);
        request.Headers[HttpRequestHeader.Authorization] = sb.ToString();
        request.ContentType = "text/xml";
        request.Accept = "text/xml";
        request.KeepAlive = true;
        request.Method = "POST";
        try
        {
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                Stream responseStream = response.GetResponseStream();
                StreamReader responseReader = new StreamReader(responseStream);
                string text = responseReader.ReadToEnd();
                try
                {
                    Dictionary<String, string> responseDic = GetDictionaryFromQueryString(text);
                    string token = responseDic.First(q => q.Key == "oauth_token").Value;
                    string secret = responseDic.First(q => q.Key == "oauth_token_secret").Value;
                    Configuration objConfig = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~");
                    AppSettingsSection objAppsettings = (AppSettingsSection)objConfig.GetSection("appSettings");
                    //Edit
                    if (objAppsettings != null)
                    {
                        objAppsettings.Settings["Magento.Token"].Value = token;
                        objAppsettings.Settings["Magento.TokenSecret"].Value = secret;
                        objConfig.Save();
                    }
                    errorLabel.Text = "Done";
                    errorLabel.ForeColor = System.Drawing.Color.Green;
                }
                catch (Exception ex)
                {
                    errorLabel.Text = "Exchanging token failed.<br>Response text = " + text + "<br>Exception = " + ex.Message;
                }
            }
        }
        catch (WebException ex)
        {
            var responseStream = ex.Response.GetResponseStream();
            StreamReader responseReader = new StreamReader(responseStream);
            string resp = responseReader.ReadToEnd();
            errorLabel.Text = resp;
        }
    }
    private void BeginAuthorization()
    {
        string CallbackUrl = Server.UrlEncode(Request.Url.AbsoluteUri);
        var uri = new Uri(MagentoServer + "/oauth/initiate?oauth_callback=" + CallbackUrl);
        OAuthBase oAuth = new OAuthBase();
        string nonce = oAuth.GenerateNonce();
        string timeStamp = oAuth.GenerateTimeStamp();
        string parameters;
        string normalizedUrl;
        string signature = oAuth.GenerateSignature(uri, ConsumerKey, ConsumerSecret,
        String.Empty, String.Empty, "GET", timeStamp, nonce, OAuthBase.SignatureTypes.PLAINTEXT,
        out normalizedUrl, out parameters);
        StringBuilder sb = new StringBuilder("OAuth ");
        sb.AppendFormat("oauth_callback=\"{0}\",", CallbackUrl);
        sb.AppendFormat("oauth_version=\"{0}\",", "1.0");
        sb.AppendFormat("oauth_signature_method=\"{0}\",", "PLAINTEXT");
        sb.AppendFormat("oauth_nonce=\"{0}\",", nonce);
        sb.AppendFormat("oauth_timestamp=\"{0}\",", timeStamp);
        sb.AppendFormat("oauth_consumer_key=\"{0}\",", ConsumerKey);
        sb.AppendFormat("oauth_signature=\"{0}\"", signature);
        var request = (HttpWebRequest)WebRequest.Create(uri);
        request.Headers[HttpRequestHeader.Authorization] = sb.ToString();
        request.ContentType = "text/xml";
        request.Accept = "text/xml";
        request.KeepAlive = true;
        request.Method = "GET";
        try
        {
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                Stream responseStream = response.GetResponseStream();
                StreamReader responseReader = new StreamReader(responseStream);
                string text = responseReader.ReadToEnd();
                try
                {
                    Dictionary<String, string> dic = GetDictionaryFromQueryString(text);
                    string oauth_token = dic.First(q => q.Key == "oauth_token").Value;
                    string oauth_token_secret = dic.First(q => q.Key == "oauth_token_secret").Value;
                    Session["oauth_token_secret"] = oauth_token_secret;
                    string redirectUrl = MagentoServer + "/index.php/admin/oauth_authorize?oauth_token=" + oauth_token + "&oauth_verifier=" +
                        oauth_token_secret;
                    Response.Redirect(redirectUrl);
                }
                catch (Exception ex)
                {
                    errorLabel.Text = "Parsing request token failed.<br>Response text = " + text + "<br>Exception = " + ex.Message;
                }
            }
        }
        catch (WebException ex)
        {
            var responseStream = ex.Response.GetResponseStream();
            StreamReader responseReader = new StreamReader(responseStream);
            string resp = responseReader.ReadToEnd();
            errorLabel.Text = resp;
        }
    }
    private static Dictionary<string, string> GetDictionaryFromQueryString(string queryString)
    {
        string[] parts = queryString.Split('&');
        Dictionary<String, string> dic = new Dictionary<string, string>();
        foreach (var part in parts)
        {
            dic.Add(part.Split('=')[0], part.Split('=')[1]);
        }
        return dic;
    }
    #region Settings
    string MagentoServer
    {
        get
        {
            return ConfigurationManager.AppSettings["Magento.Server"];
        }
    }
    string ConsumerKey
    {
        get
        {
            return ConfigurationManager.AppSettings["Magento.ConsumerKey"];
        }
    }
    string ConsumerSecret
    {
        get
        {
            return ConfigurationManager.AppSettings["Magento.ConsumerSecret"];
        }
    }
    #endregion
}
在类文件中添加以下代码
public class ApiClient
{
    public ApiClient(string magentoServer, string consumerKey, string consumerSecret, string accessToken, string accessTokenSeccret)
    {
        MagentoServer = magentoServer;
        ConsumerKey = consumerKey;
        ConsumerSecret = consumerSecret;
        AccessToken = accessToken;
        AccessTokenSecret = accessTokenSeccret;
    }
    #region Request
    HttpWebRequest CreateAuthorizedRequest(string url, string requestMethod,ApiFilter filter)
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url + "?" + filter.ToString());
        OAuthBase oAuth = new OAuthBase();
        string nonce = oAuth.GenerateNonce();
        string timeStamp = oAuth.GenerateTimeStamp();
        string parameters;
        string normalizedUrl;
        string signature = oAuth.GenerateSignature(new Uri(url), ConsumerKey, ConsumerSecret,
        AccessToken, AccessTokenSecret, requestMethod, timeStamp, nonce, OAuthBase.SignatureTypes.PLAINTEXT,
        out normalizedUrl, out parameters);
        StringBuilder sb = new StringBuilder("OAuth ");
        sb.AppendFormat("oauth_token=\"{0}\",", AccessToken);
        sb.AppendFormat("oauth_version=\"{0}\",", "1.0");
        sb.AppendFormat("oauth_signature_method=\"{0}\",", "PLAINTEXT");
        sb.AppendFormat("oauth_nonce=\"{0}\",", nonce);
        sb.AppendFormat("oauth_timestamp=\"{0}\",", timeStamp);
        sb.AppendFormat("oauth_consumer_key=\"{0}\",", ConsumerKey);
        sb.AppendFormat("oauth_signature=\"{0}\"", signature);
        request.Headers[HttpRequestHeader.Authorization] = sb.ToString();
        request.Method = requestMethod;
        //request.ContentType = "application/json";
        request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";//application/json,
        request.KeepAlive = true;
        return request;
    }
    string FetchRequest(HttpWebRequest request)
    {
        try
        {
            string responseText = string.Empty;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                using (Stream responseStream = response.GetResponseStream())
                {
                    using (StreamReader responseReader = new StreamReader(responseStream))
                    {
                        responseText = responseReader.ReadToEnd();
                        return responseText;
                    }
                }
            }
            return responseText;
        }
        catch (WebException ex)
        {
            var responseStream = ex.Response.GetResponseStream();
            StreamReader responseReader = new StreamReader(responseStream);
            string responseText = responseReader.ReadToEnd();
            throw new MagentoApiException(responseText,ex.Status);
        }
    }
    #endregion
    #region Public properties
    string MagentoServer { get; set; }
    string ConsumerKey { get; set; }
    string ConsumerSecret { get; set; }
    string AccessToken { get; set; }
    string AccessTokenSecret { get; set; }
    #endregion
}
public class ApiFilter
{
    public ApiFilter()
    {
        filterDescriptions = new List<FilterDescription>();
    }
    public int? Page { get; set; }
    public int? Limit { get; set; }
    public List<FilterDescription> filterDescriptions;
    public const string Type = "rest";
    public void AddFilter(string column, FilterType filterType, string value)
    {
        filterDescriptions.Add(new FilterDescription()
        {
            Column = column,
            FilterType = filterType,
            Value = value
        });
    }
    public override string ToString()
    {
        StringBuilder sb = new StringBuilder();
        sb.AppendFormat("type={0}", Type);
        if (Page.HasValue)
            sb.AppendFormat("&page={0}", Page.Value);
        if (Limit.HasValue)
            sb.AppendFormat("&limit={0}", Limit.Value);
        int counter = 1;
        foreach (var filter in filterDescriptions)
        {
            sb.AppendFormat("&filter[{0}][attribute]={1}&filter[{2}][{3}]={4}", counter, filter.Column, counter, filter.FilterType, filter.Value);
            counter++;
        }
        return sb.ToString();
    }
}
public class FilterDescription
{
    public string Column { get; set; }
    public FilterType FilterType { get; set; }
    public string Value { get; set; }
}
public enum FilterType
{
    /// <summary>
    /// Not Equal To
    /// </summary>
    neq,
    /// <summary>
    /// equals any of
    /// </summary>
    @in,
    /// <summary>
    /// not equals any of
    /// </summary>
    nin,
    /// <summary>
    /// greater than
    /// </summary>
    gt,
    /// <summary>
    /// less than
    /// </summary>
    lt
}
public class MagentoApiException : Exception
{
    public MagentoApiException(string responseText, WebExceptionStatus status)
    {
        ResponseText = responseText;
        Status = status;
    }
    public string ResponseText { get; set; }
    public WebExceptionStatus Status { get; set; }
}
也不要忘记将https://oauth.googlecode.com/svn/code/csharp/OAuthBase.cs添加到项目中
可以使用了。从 api 读取:
var request = CreateAuthorizedRequest(MagentoServer + "/api/rest/products", "get", new ApiFilter() {Page = 1 });
            var responseText = FetchRequest(request);
Magento REST Api 文档可以在这里找到