c# - PrepareRequestUserAuthorizationAsync 失败

Question

我有非常简单的代码，对我来说效果很好:

var url = System.Web.HttpContext.Current.Request.Url;
Uri callbackUrl = new System.Uri(url, "oAuth2CallBack");

var ub = new UriBuilder(callbackUrl);
// decodes urlencoded pairs from uri.Query to var
var httpValueCollection = HttpUtility.ParseQueryString(callbackUrl.Query);
httpValueCollection.Add(UrlArguments.Param, null);

// urlencodes the whole HttpValueCollection
ub.Query = httpValueCollection.ToString();

var authorizationRequest = OAuthClient.PrepareRequestUserAuthorization(new[] { "somedata" }, ub.Uri);
authorizationRequest.Send();

我已经更新了 OAuth 的 NuGet 包并以这种方式重写了代码:

var url = System.Web.HttpContext.Current.Request.Url;
Uri callbackUrl = new System.Uri(url, "oAuth2CallBack");


var ub = new UriBuilder(callbackUrl);
// decodes urlencoded pairs from uri.Query to var
var httpValueCollection = HttpUtility.ParseQueryString(callbackUrl.Query);
httpValueCollection.Add(UrlArguments.Param, null);

// urlencodes the whole HttpValueCollection
ub.Query = httpValueCollection.ToString();

var client = new WebServerClient(new AuthorizationServerDescription
{
    TokenEndpoint = Configuration.OAuth2.TokenEndpoint,
    AuthorizationEndpoint = Configuration.OAuth2.AuthorizationEndpoint,
},
                clientIdentifier: Configuration.OAuth2.ClientIdentifier,
                clientCredentialApplicator: ClientCredentialApplicator.PostParameter(
                                        Configuration.OAuth2.ClientSecret));

var authorizationRequest = await client.PrepareRequestUserAuthorizationAsync(new[] { "somedata" }, ub.Uri);
await authorizationRequest.SendAsync();            

但是 PrepareRequestUserAuthorizationAsync 抛出异常

"Attempt by method 'DotNetOpenAuth.OAuth2.WebServerClient+d__3.MoveNext()' to access method 'System.Collections.Generic.List`1..ctor()' failed."

Answer 1

问题是 DotNetOpenAuth.OAuth2.Client 从 WebApi nuget 包中引用了 System.Net.Http.Formatters 5.0。从 .NET 4.0/4.5 BCL 设置对 System.Net.Http.Formatters 4.0 的引用解决了这个问题，所有测试仍然通过。

查看github上的提交 https://github.com/rcollette/DotNetOpenAuth/commit/59fe1e820fc48df8bb079b210ac585974f8326f5

查看拉取请求 https://github.com/DotNetOpenAuth/DotNetOpenAuth/pull/350