对于我的asp.net网站,我试图把FB&谷歌登录。我从ASPSNIPPETS找到了教程。现在,我所做的就是如果用户点击Facebook登录按钮,那么它首先授权用户&在面板中获取用户详细信息然后我把我的代码检查用户是否已经存在于我的数据库中。如果没有,则插入用户&然后把登录代码。我的问题是在执行第一行代码之后它会停止执行,以便它无法检查用户是否已登录&等等。我认为这可能是因为重定向url会停止执行更多代码。我该如何消除这个问题?
Protected Sub Login(sender As Object, e As EventArgs)
FaceBookConnect.Authorize("user_photos,email", Request.Url.AbsoluteUri.Split("?"c)(0))
If Not String.IsNullOrEmpty(lblId.Text) Then
Dim query As String = "Select ID, email From users where ID=@id"
con.Open()
Dim cmd As New MySqlCommand(query, con)
cmd.Parameters.AddWithValue("@id", lblId.Text)
Dim dr As MySqlDataReader = cmd.ExecuteReader()
If dr.HasRows Then
'Do Login Code here
Try
Dim str As String = "select * from users where ID='" + lblId.Text + "';"
Dim cmd2 As New MySqlCommand(str, con)
Dim da As New MySqlDataAdapter(cmd2)
Response.Cookies("User_Type").Value = "users"
Response.Cookies("chkusername").Value = lblId.Text
Response.Redirect(Request.Url.AbsoluteUri)
welcome.Visible = True
Catch ex As Exception
Response.Write(ex)
End Try
Else
Try
Dim str1 As String = "INSERT INTO users (ID, DP, displayName) values('" + lblId.Text + "', '" + ProfileImage.ImageUrl.ToString + "', '" + lblName.Text + "')"
Dim adapter As New MySqlDataAdapter
Dim command As New MySqlCommand
dr.Close()
command.CommandText = str1
command.Connection = con
adapter.SelectCommand = command
command.ExecuteNonQuery()
Catch ex As Exception
Response.Write(ex)
End Try
Dim con2 As New MySqlConnection("connectionstring")
con2.Open()
Dim cmd3 As New MySqlCommand("Select ID, email From users where ID=@id", con2)
cmd3.Parameters.AddWithValue("@id", lblId.Text)
Dim dr2 As MySqlDataReader = cmd3.ExecuteReader()
If dr2.HasRows Then
'Do Login Code here
Try
Dim str As String = "select * from users where ID='" + lblId.Text + "';"
Dim cmd2 As New MySqlCommand(str, con2)
con2.Open()
Dim da As New MySqlDataAdapter(cmd3)
Response.Cookies("User_Type").Value = "users"
Response.Cookies("chkusername").Value = lblId.Text
Response.Redirect(Request.Url.AbsoluteUri)
Catch ex As Exception
Response.Write(ex)
con2.Close()
End Try
con.Close()
End If
End If
End If
con.Close()
End Sub
答案 0 :(得分:0)
首先,您可以优化代码:
If Not String.IsNullOrEmpty(lblId.Text) Then
Dim str As String = "select * from users where ID=@id"
con.Open()
Dim cmd2 As New MySqlCommand(str, con)
cmd.Parameters.AddWithValue("@id", lblId.Text)
Dim da As New Common.DataAdapter(cmd2)
Dim ds As New Data.DataSet()
da.Fill(ds)
If ds.Tables(0).Rows.Count > 0 Then
'Do Login Code here
Try
Response.Cookies("User_Type").Value = "users"
Response.Cookies("chkusername").Value = lblId.Text
Response.Redirect(Request.Url.AbsoluteUri)
welcome.Visible = True
Catch ex As Exception
Response.Write(ex)
End Try
Else
Try
Dim str1 As String = "INSERT INTO users (ID, DP, displayName) values(@id, @img,@name)"
Dim cmd As New MySqlCommand
cmd = New SqlCommand(req, con)
cmd.Parameters.Add(New SqlParameter("@id", lblId.Text))
cmd.Parameters.Add(New SqlParameter("@img", ProfileImage.ImageUrl.ToString))
cmd.Parameters.Add(New SqlParameter("@name", lblName.Text))
cmd.ExecuteNonQuery()
Catch ex As Exception
Response.Write(ex)
End Try
'After insertion you don't have to select from database just send the parameters to cookies
Response.Cookies("User_Type").Value = "users"
Response.Cookies("chkusername").Value = lblId.Text
Response.Redirect(Request.Url.AbsoluteUri)
End If
con.Close()
End If