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我有一个在 chrome 和 mozilla 中运行良好的 asp.net 页面，但是当我在 safari 或 IE9 中加载它时，页面会触发两次。并且当它第二次触发页面时，会话变为空。我不明白为什么 safari & IE9 会触发页面两次。

我的代码如下： -

public partial class home : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        FBInstance fb;
        if (!IsPostBack)
        {
            Drivertab(Convert.ToInt32(GlobalVars.DriverType.PAVEMENT));
            Drivertab(Convert.ToInt32(GlobalVars.DriverType.OFFROAD));
            if (Request.Form["signed_request"] != null)
            {

                string payload = Request.Params["signed_request"].Split('.')[1];
                var encoding = new UTF8Encoding();
                var decodedJson = payload.Replace("=", string.Empty).Replace('-', '+').Replace('_', '/');
                var base64JsonArray = Convert.FromBase64String(decodedJson.PadRight(decodedJson.Length + (4 - decodedJson.Length % 4) % 4, '='));
                var json = encoding.GetString(base64JsonArray);
                //Response.Write(json.ToString());
                var o = JObject.Parse(json);
                var lPid = Convert.ToString(o.SelectToken("page.id")).Replace("\"", "");
                var isLiked = Convert.ToString(o.SelectToken("page.liked")).Replace("\"", "");
                var lUserId = Convert.ToString(o.SelectToken("user_id")).Replace("\"", "");

                {
                    string message = string.Empty;
                    DataTable FBUserData = StoredProcedures.ReadFacebookUserID(lUserId, out message);
                    hfIsUserAuthenticated.Value = "false";

                    if (FBUserData != null)
                    {
                        if (FBUserData.Rows.Count > 0)
                        {
                            hfIsUserAuthenticated.Value = "true";
                            fb = new FBInstance();

                            fb.BUserID = Convert.ToInt32(FBUserData.Rows[0]["UserID"]);
                            fb.FBUserID = FBUserData.Rows[0]["FacebookUserID"].ToString();
                            fb.AuthToken = FBUserData.Rows[0]["AuthToken"].ToString();
                            fb.IsAuthenticated = Convert.ToBoolean(FBUserData.Rows[0]["IsActive"]);
                            fb.NoOfVote = 0;
                            Session[GlobalVars.FBSession] = fb;
                            hfFBUserID.Value = fb.FBUserID;
                            RecentVoteDriver(Convert.ToInt32(GlobalVars.DriverType.PAVEMENT), fb);
                            RecentVoteDriver(Convert.ToInt32(GlobalVars.DriverType.OFFROAD), fb);
                        }

                    }
                }
            }


        }
    }

protected void Drivertab(int driverTypeID)
    {

        DataTable dt = StoredProcedures.ReadDriverCard(driverTypeID);
        if (driverTypeID == 1)
        {
            dtDriverCard.DataSource = dt;
            dtDriverCard.DataBind();
        }
        else
        {
            dtDriverCard2.DataSource = dt;
            dtDriverCard2.DataBind();
        }
    }

public void RecentVoteDriver(int DriverTypeID, FBInstance fb)
    {
        DataTable dt = StoredProcedures.ReadRecentVote(fb.BUserID, DriverTypeID);

        if (DriverTypeID == 2)
        {
            if (dt.Rows.Count > 0)
            {
                DateTime VoteDate = Convert.ToDateTime(dt.Rows[0]["VoteDateTime"]);
                if (VoteDate.Date != DateTime.Now.Date)
                {
                    Image1.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver.jpg";
                }
                else
                {
                    DataTable Rdt = StoredProcedures.ReadRecentDriverCard(Convert.ToInt32(dt.Rows[0]["DriverCardID"]));
                    if (Rdt.Rows.Count > 0)
                    {
                        Image1.ImageUrl = GlobalVars.ImageURL + "/drivers/" + Rdt.Rows[0]["ImageURL"].ToString();
                    }
                    else
                    {
                        Image1.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver.jpg";
                    }
                }
            }
            else
            {
                Image1.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver.jpg";
            }

        }
        else
        {
            if (dt.Rows.Count > 0)
            {
                DateTime VoteDate = Convert.ToDateTime(dt.Rows[0]["VoteDateTime"]);
                if (VoteDate.Date != DateTime.Now.Date)
                {
                    Image2.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver1.jpg";
                }
                else
                {
                    DataTable Rdt = StoredProcedures.ReadRecentDriverCard(Convert.ToInt32(dt.Rows[0]["DriverCardID"]));
                    if (Rdt.Rows.Count > 0)
                    {
                        Image2.ImageUrl = GlobalVars.ImageURL + "/drivers/" + Rdt.Rows[0]["ImageURL"].ToString();
                    }
                    else
                    {
                        Image2.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver1.jpg";
                    }
                }
            }
            else
            {
                Image2.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver1.jpg";
            }
        }
    }

有没有人有什么解决办法。

感谢您的帮助

4

2 回答 2

0

尝试编辑RecentVoteDriver设置此默认值 Image1.ImageUrl（是否会发生在某些情况下没有设置 if-else 子句中的图像？）。

原因

请查看页面上呈现的 html：

每次出现

<img src=""/>

对于某些浏览器，可能会发生双重回发...

如果这是问题，您可以为每个按钮设置一个默认的空白图像来解决它

<asp:ImageButton ImageUrl="~/Images/blank.gif"...
于 2012-07-06T15:54:24.437 回答
0 
public partial class home : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        FBInstance fb;
        if (!IsPostBack)
        {
            Drivertab(Convert.ToInt32(GlobalVars.DriverType.PAVEMENT));
            Drivertab(Convert.ToInt32(GlobalVars.DriverType.OFFROAD));
            if (Request.Form["signed_request"] != null)
            {

                string payload = Request.Params["signed_request"].Split('.')[1];
                var encoding = new UTF8Encoding();
                var decodedJson = payload.Replace("=", string.Empty).Replace('-', '+').Replace('_', '/');
                var base64JsonArray = Convert.FromBase64String(decodedJson.PadRight(decodedJson.Length + (4 - decodedJson.Length % 4) % 4, '='));
                var json = encoding.GetString(base64JsonArray);
                //Response.Write(json.ToString());
                var o = JObject.Parse(json);
                var lPid = Convert.ToString(o.SelectToken("page.id")).Replace("\"", "");
                var isLiked = Convert.ToString(o.SelectToken("page.liked")).Replace("\"", "");
                var lUserId = Convert.ToString(o.SelectToken("user_id")).Replace("\"", "");

                {
                    string message = string.Empty;
                    DataTable FBUserData = StoredProcedures.ReadFacebookUserID(lUserId, out message);
                    hfIsUserAuthenticated.Value = "false";

                    if (FBUserData != null)
                    {
                        if (FBUserData.Rows.Count > 0)
                        {
                            hfIsUserAuthenticated.Value = "true";
                            fb = new FBInstance();

                            fb.BUserID = Convert.ToInt32(FBUserData.Rows[0]["UserID"]);
                            fb.FBUserID = FBUserData.Rows[0]["FacebookUserID"].ToString();
                            fb.AuthToken = FBUserData.Rows[0]["AuthToken"].ToString();
                            fb.IsAuthenticated = Convert.ToBoolean(FBUserData.Rows[0]["IsActive"]);
                            fb.NoOfVote = 0;
                            Session[GlobalVars.FBSession] = fb;
                            hfFBUserID.Value = fb.FBUserID;
                            RecentVoteDriver(Convert.ToInt32(GlobalVars.DriverType.PAVEMENT), fb);
                            RecentVoteDriver(Convert.ToInt32(GlobalVars.DriverType.OFFROAD), fb);
                        }

                    }
                }
            }


        }
    }

protected void Drivertab(int driverTypeID)
    {

        DataTable dt = StoredProcedures.ReadDriverCard(driverTypeID);
        if (driverTypeID == 1)
        {
            dtDriverCard.DataSource = dt;
            dtDriverCard.DataBind();
        }
        else
        {
            dtDriverCard2.DataSource = dt;
            dtDriverCard2.DataBind();
        }
    }

public void RecentVoteDriver(int DriverTypeID, FBInstance fb)
    {
        DataTable dt = StoredProcedures.ReadRecentVote(fb.BUserID, DriverTypeID);

        if (DriverTypeID == 2)
        {
            if (dt.Rows.Count > 0)
            {
                DateTime VoteDate = Convert.ToDateTime(dt.Rows[0]["VoteDateTime"]);
                if (VoteDate.Date != DateTime.Now.Date)
                {
                    Image1.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver.jpg";
                }
                else
                {
                    DataTable Rdt = StoredProcedures.ReadRecentDriverCard(Convert.ToInt32(dt.Rows[0]["DriverCardID"]));
                    if (Rdt.Rows.Count > 0)
                    {
                        Image1.ImageUrl = GlobalVars.ImageURL + "/drivers/" + Rdt.Rows[0]["ImageURL"].ToString();
                    }
                    else
                    {
                        Image1.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver.jpg";
                    }
                }
            }
            else
            {
                Image1.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver.jpg";
            }

        }
        else
        {
            if (dt.Rows.Count > 0)
            {
                DateTime VoteDate = Convert.ToDateTime(dt.Rows[0]["VoteDateTime"]);
                if (VoteDate.Date != DateTime.Now.Date)
                {
                    Image2.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver1.jpg";
                }
                else
                {
                    DataTable Rdt = StoredProcedures.ReadRecentDriverCard(Convert.ToInt32(dt.Rows[0]["DriverCardID"]));
                    if (Rdt.Rows.Count > 0)
                    {
                        Image2.ImageUrl = GlobalVars.ImageURL + "/drivers/" + Rdt.Rows[0]["ImageURL"].ToString();
                    }
                    else
                    {
                        Image2.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver1.jpg";
                    }
                }
            }
            else
            {
                Image2.ImageUrl = GlobalVars.ImageURL + "/DefaultDriver1.jpg";
            }
        }
    }
于 2012-07-06T15:52:02.190 回答