跟踪 C# 控制器和视图中的两个变量
本文关键字：两个 变量 控制器 视图 跟踪 | 更新日期: 2023-09-27 17:56:04
我的控制器类中有两个变量，第一个称为currentUserId，它意味着存储登录到网站的当前用户。第二个变量是 currentRoomId，用于跟踪用户所在的当前聊天室。问题是，当用户登录时，它将正确的变量很好地存储到两个变量中，但是在它离开范围后，它不会保存值。我需要做的基本事情是跟踪这两个变量。我不确定最好的方法是什么。
这是我目前拥有的：
我的控制器：
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Configuration;
using System.Web.Mvc;
using System.Web.Script.Serialization;
using Microsoft.Ajax.Utilities;
using SignalRChat.Models;
using System.Web;
namespace SignalRChat.Controllers
{
public class HomeController : Controller
{
ChatDBEntities DB = new ChatDBEntities();
ChatDBEntities1 DB_Uno = new ChatDBEntities1();
ChatDBEntities2 DB_Dos = new ChatDBEntities2();
int currentUserId = -1;
int currentRoomId = 1;
public ActionResult Chat()
{
return View();
}
public ActionResult Users()
{
return View();
}
public ActionResult Index()
{
return View();
}
public ActionResult About()
{
ViewBag.Message = "Your application description page.";
return View();
}
public ActionResult Contact()
{
ViewBag.Message = "Your contact page.";
return View();
}
[HttpPost]
public bool AddMessage(string messageCont)
{
var authorId = (int) Session["currentUserId"];
var message = new ChatMessage();
message.Author = DB_Dos.ChatRoomUsers.Find(authorId).UserName; // Add Code to get the actual user
message.AuthorId = authorId; ; //Add Code to get current user Id
message.Message = messageCont;
message.MessageDate = DateTime.UtcNow;
message.RoomId = (int)Session["currentRoomId"]; ; //Add Room Code
message.RoomName = DB_Uno.ChatRooms.Find(currentRoomId).RoomName; // Get actual name based on id
try
{
DB.ChatMessages.Add(message);
DB.SaveChanges();
return true;
}
catch (Exception)
{
return false;
}
}
[HttpGet]
public string GetMessages(int roomId)
{
Session["currentRoomId"] = roomId;
var messages = (from message in DB.ChatMessages where message.RoomId == roomId orderby message.MessageDate ascending select message).ToList();
var serializer = new JavaScriptSerializer();
string json = serializer.Serialize(messages);
return json;
}
[HttpGet]
public int GetCurrentRoomId()
{
return currentRoomId;
}
[HttpGet]
public int GetCurrentUserId()
{
return currentUserId;
}
[HttpPost]
public bool AddRoom(string chatRoom)
{
var room = new ChatRoom();
room.IsActiveRoom = true;
room.RoomName = chatRoom;
room.isDefaultRoom = false;
room.UserCount = 1;
room.Id = -1;
try
{
DB_Uno.ChatRooms.Add(room);
DB_Uno.SaveChanges();
return true;
}
catch (Exception)
{
return false;
}
}
[HttpGet]
public string GetRooms()
{
var rooms = DB_Uno.ChatRooms;
var serializer = new JavaScriptSerializer();
string json = serializer.Serialize(rooms);
return json;
}
public ActionResult AddUser()
{
return View();
}
[HttpPost]
public ActionResult AddUser(ChatRoomUser user)
{
var users = DB_Dos.ChatRoomUsers;
try
{
user.LastActivity = DateTime.UtcNow;
user.RoomId = 1;
user.RoomName = "General Chat";
users.Add(user);
DB_Dos.SaveChanges();
currentUserId = user.UserId;
return View("Chat");
}
catch(Exception)
{
return View();
}
}
public ActionResult Login()
{
return View();
}
[HttpPost]
public ActionResult Login(ChatRoomUser LUser)
{
var userId = (from u in DB_Dos.ChatRoomUsers where u.UserName == LUser.UserName select u.UserId).ToList();
var user = DB_Dos.ChatRoomUsers.Find(userId[0]);
if(user.password == LUser.password)
{
currentUserId = user.UserId;
user.LastActivity = DateTime.UtcNow;
Session["currentRoomId"] = user.RoomId;
Session["currendUserId"] = user.UserId;
DB_Dos.SaveChanges();
return View("Chat");
}
else
{
return View();
}
}
}
}
以下是我的观点：
@{
ViewBag.Title = "Chat";
}
<h2>General Chat</h2>
<div id="wrapper">
<div id="upper-wrapper">
<div id="available-rooms-dialog">
<h4>Available Rooms</h4>
</div>
<form id="ava-rooms">
<input type="button" onclick="GetRoomName()" id=" createroom" value="Create Room" />
</form>
<div id="discussion-dialog">
<textarea rows="30" cols="50" id="discussion"></textarea>
</div>
</div>
<div id="message-dialog">
<textarea rows="3" id="message">Type your message</textarea>
<br/>
<input type="button" id="sendmessage" value="Post" />
<input type="hidden" id="displayname" />
<input type="checkbox" id="enter-sends-message"/>
Enter sends message
</div>
</div>
@section scripts
{
<script src="~/Scripts/jquery.signalR-2.0.2.min.js"></script>
<script src="~/signalr/hubs"></script>
<script type="text/javascript">
var json;
var currentUserId;
var CurrentRoomId;
var MyVariable = '@ViewBag.MyVariable';
$(function () {
LoadRooms();
// Reference the auto-generated proxy for the hub.
var chat = $.connection.chatHub;
// Create a function that the hub can call back to display messages.
chat.client.addNewMessageToPage = function (name, message) {
// Add the message to the page.
$.ajax(
{
type: "Get",
url: "@Url.Action("GetCurrentRoomId", "Home")",
success: function (data)
{
currentRoomId = data;
}
});
$.ajax(
{
type: "Get",
url: "@Url.Action("GetCurrentUserId", "Home")",
success: function (data)
{
currentUserId = data;
}
});
//TODO: Add Record to Server
$.ajax(
{
type: "Post",
url: "@Url.Action("AddMessage", "Home")",
data: { messageCont: message.toString()},
success: function (data) {
for (var i = 0; i < data.length; i++) {
//access with data[i].modelattribute
}
}
});
$.ajax(
{
type: "Get",
url: "@Url.Action("GetMessages", "Home")",
success: function (data) {
json = data;
var obj = JSON.parse(json);
for (var i = 0; i < data.length; i++) {
//access with data[i].modelattribute
$('#discussion').append(htmlEncode(obj[i].Author) + " : " + htmlEncode(obj[i].Message) + "'r'n");
}
}
});
};
// Get the user name and store it to prepend to messages.
// Set initial focus to message input box.
$('#message').focus();
// Start the connection.
$.connection.hub.start().done(function () {
$('#sendmessage').click(function () {
// Call the Send method on the hub.
chat.server.send($('#displayname').val(), $('#message').val());
// Clear text box and reset focus for next comment.
$('#message').val('').focus();
});
});
});
// This optional function html-encodes messages for display in the page.
function htmlEncode(value) {
var encodedValue = $('<div />').text(value).html();
return encodedValue;
}
function GetRoomName() {
var newRoomName = prompt('Enter a new Room Name', 'Name');
$.ajax(
{
type: "Post",
url: "@Url.Action("AddRoom", "Home")",
data: { chatRoom: newRoomName },
success: function (data) {
for (var i = 0; i < data.length; i++) {
//access with data[i].modelattribute
}
}
});
}
function LoadRooms() {
$.ajax(
{
type: "Get",
url: "@Url.Action("GetRooms", "Home")",
success: function (data) {
json = data;
var obj = JSON.parse(json);
for (var i = 0; i < data.length; i++) {
//access with data[i].modelattribute
// Add an Onlick event to this statment that calls LoadRoomMessages
//onclick="GetRoomName()"
$('#ava-rooms').append("<input type='"button'" " +"onclick=LoadRoomMessages(" + obj[i].Id + ") " + "id='"" + obj[i].RoomName +"'"" + "value='"" + obj[i].RoomName +"'" />");
}
}
});
}
function LoadRoomMessages(id)
{
$.ajax(
{
type: "Get",
url: "@Url.Action("GetMessages", "Home")",
data: { roomId: id },
success: function (data)
{
$('#discussion').empty();
json = data;
var obj = JSON.parse(json);
for (var i = 0; i < data.length; i++)
{
$('#discussion').append(htmlEncode(obj[i].Author) + " : " + htmlEncode(obj[i].Message) + "'r'n");
}
}
});
}
</script>
}
}
有什么建议吗？
您可以使用
Session来存储这些变量。只要会话未过期，它们将在任何控制器或视图上使用。
在控制器上设置会话变量
Session["currentRoomId"] = roomId;
获取控制器上的会话变量
int roomId = (int)Session["currentRoomId"];
获取剃刀视图上的会话变量
@Session["currentRoomId"]