Question

我正在我的网站上实施谷歌登录。使用asspsnippets.dll。

我在页面加载的这一行中没有将对象引用设置为实例错误

string json = GoogleConnect.Fetch("me", code);

我的完整代码在这里

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using ASPSnippets.GoogleAPI;
using System.Web.Script.Serialization;

namespace AdventureSports.Public
{
    public partial class google_login : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {
            GoogleConnect.ClientId = "<My client Id>";
            GoogleConnect.ClientSecret = "<My secret code>";
            GoogleConnect.RedirectUri = Request.Url.AbsoluteUri.Split('?')[0];

            if (!string.IsNullOrEmpty(Request.QueryString["code"]))
            {
                string code = Request.QueryString["code"];
                string json = GoogleConnect.Fetch("me", code);
                GoogleProfile profile = new JavaScriptSerializer().Deserialize<GoogleProfile>(json);
                lblId.Text = profile.Id;
                lblName.Text = profile.DisplayName;
                lblEmail.Text = profile.Emails.Find(email => email.Type == "account").Value;
                lblGender.Text = profile.Gender;
                lblType.Text = profile.ObjectType;
                ProfileImage.ImageUrl = profile.Image.Url;
                pnlProfile.Visible = true;
                btnLogin.Enabled = false;
            }

            if (Request.QueryString["error"] == "access_denied")
            {
                ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('Access denied.')", true);
            }
        }

        protected void Login(object sender, EventArgs e)
        {
            GoogleConnect.Authorize("profile", "email");
        }

        protected void Clear(object sender, EventArgs e)
        {
            GoogleConnect.Clear();
        }

        public class GoogleProfile
        {
            public string Id { get; set; }
            public string DisplayName { get; set; }
            public Image Image { get; set; }
            public List<Email> Emails { get; set; }
            public string Gender { get; set; }
            public string ObjectType { get; set; }
        }

        public class Email
        {
            public string Value { get; set; }
            public string Type { get; set; }
        }

        public class Image
        {
            public string Url { get; set; }
        }
    }
}

Answer 1

确保您有一个名为＆＃39; code＆＃39;的查询字符串参数。如果querystring参数具有空值，则通常会发生此错误。请输入断点并检查查询字符串参数的值＆＃39;代码＆＃39;。希望该值未正确分配给查询字符串参数＆＃39;代码＆＃39;

Answer 2

dll只有问题。从下面的url下载新的dll并参考此示例代码

facebook login using asp.net

使用谷歌登录asp.net应用程序时，对象引用未设置为实例错误

2 个答案: