远程身份验证错误：OpenIdConnectAuthenticationHandler：message.State为空或空白。

该错误发生在使用OpenIdConnect进行身份验证时，通常是由于未正确配置OpenIdConnectAuthenticationOptions中的StateDataFormat属性所致。为了解决此问题，您应该在StartUp.cs文件中修改配置：

services.AddAuthentication(opts => { opts.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme; opts.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme; }).AddJwtBearer(options => { options.Authority = "https://example.com/"; options.Audience = "https://example.com/resource"; }).AddOpenIdConnect("oidc", options => { options.Authority = "https://example.com/"; options.ClientId = "clientId"; options.ClientSecret = "clientSecret"; options.ResponseType = "code id_token"; options.Scope.Add("openid"); options.Scope.Add("profile"); options.Scope.Add("email"); options.SaveTokens = true;

// 添加此行
options.StateDataFormat = new CustomStateDataFormat();

});

然后您需要创建一个名为CustomStateDataFormat的新类：

public class CustomStateDataFormat : ISecureDataFormat<AuthenticationProperties> { public string Protect(AuthenticationProperties data) { throw new NotImplementedException(); }

public AuthenticationProperties Unprotect(string state)
{
    if (string.IsNullOrWhiteSpace(state))
    {
        throw new ArgumentNullException(nameof(state));
    }

    return JsonConvert.DeserializeObject<AuthenticationProperties>(Base64UrlTextEncoder.Decode(state));
}

}

这将告诉OpenIdConnectAuthenticationOptions在验证期间正确处理state属性，从而解决了原始错误。