【发布时间】：2016-01-05 17:32:32
【问题描述】：
我使用在线示例开发了一个 SR 2 应用程序。它不是 MVC 版本，我用 C# 编写代码。
我用一个表查询一个数据库，该表包含一行具有许多字段的数据。
我的问题是数据在初始页面加载时显示，但在数据库中的数据更改后不显示。如果我手动刷新页面，页面上的数据会更新，反映数据库中的更改。有什么线索吗？如果您需要更多信息，请告诉我。
谢谢， default.aspx 页面上的脚本。 iData 是一个包含要显示的值的数组。
$(function () {
// Declare a proxy to reference the hub.
var wip = $.connection.wipHub;
// Create a function that the hub can call to broadcast messages.
wip.client.receiveWip = function (iData) {
arr = iData.split(',');
}
});
此处为集线器代码：
[HubName("wipHub")]
public class WipHub : Hub
{
string param = "";
int TML1 = 0; int TML2 = 0; int TMT1 = 0; int TMT2 = 0;
int MLT1 = 0; int SNL1 = 0; int CAV1 = 0; int IBL1 = 0; int PAW1 = 0; int PLB1 = 0;
int MLT2 = 0; int SNL2 = 0; int CAV2 = 0; int IBL2 = 0; int PAW2 = 0; int PLB2 = 0;
int MLT3 = 0; int SNL3 = 0; int CAV3 = 0; int IBL3 = 0; int PAW3 = 0; int PLB3 = 0;
int MLT4 = 0; int SNL4 = 0; int CAV4 = 0; int IBL4 = 0; int PAW4 = 0; int PLB4 = 0;
int MLT5 = 0; int SNL5 = 0; int CAV5 = 0; int IBL5 = 0; int PAW5 = 0; int PLB5 = 0;
[HubMethodName("sendWip")]
public void SendWip()
{
using ( var connection = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString) )
{
string query = "Select MLT1,MLT2,MLT3,MLT4,MLT5,SNL1,SNL2,SNL3,SNL4,SNL5,CAV1,CAV2,CAV3,CAV4,CAV5,IBL1,IBL2,IBL3,IBL4,IBL5,PAW1,PAW2,PAW3,PAW4,PAW5,PLB1,PLB2,PLB3,PLB4,PLB5,TML1,TML2,TMT1,TMT2 FROM WIP_Table Where ID=" + 1;
connection.Open();
using ( SqlCommand command = new SqlCommand(query, connection) )
{
command.Notification = null;
DataTable dt = new DataTable();
SqlDependency dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
if(connection.State== ConnectionState.Closed)
{
connection.Open();
SqlDependency.Start(connection.ConnectionString);
}
var reader = command.ExecuteReader();
dt.Load(reader);
if ( dt.Rows.Count > 0 )
{
MLT1 = int.Parse(dt.Rows[0]["MLT1"].ToString());
MLT2 = int.Parse(dt.Rows[0]["MLT2"].ToString());
MLT3 = int.Parse(dt.Rows[0]["MLT3"].ToString());
MLT4 = int.Parse(dt.Rows[0]["MLT4"].ToString());
MLT5 = int.Parse(dt.Rows[0]["MLT5"].ToString());
SNL1 = int.Parse(dt.Rows[0]["SNL1"].ToString());
SNL2 = int.Parse(dt.Rows[0]["SNL2"].ToString());
SNL3 = int.Parse(dt.Rows[0]["SNL3"].ToString());
SNL4 = int.Parse(dt.Rows[0]["SNL4"].ToString());
SNL5 = int.Parse(dt.Rows[0]["SNL5"].ToString());
CAV1 = int.Parse(dt.Rows[0]["CAV1"].ToString());
CAV2 = int.Parse(dt.Rows[0]["CAV2"].ToString());
CAV3 = int.Parse(dt.Rows[0]["CAV3"].ToString());
CAV4 = int.Parse(dt.Rows[0]["CAV4"].ToString());
CAV5 = int.Parse(dt.Rows[0]["CAV5"].ToString());
IBL1 = int.Parse(dt.Rows[0]["IBL1"].ToString());
IBL2 = int.Parse(dt.Rows[0]["IBL2"].ToString());
IBL3 = int.Parse(dt.Rows[0]["IBL3"].ToString());
IBL4 = int.Parse(dt.Rows[0]["IBL4"].ToString());
IBL5 = int.Parse(dt.Rows[0]["IBL5"].ToString());
PAW1 = int.Parse(dt.Rows[0]["PAW1"].ToString());
PAW2 = int.Parse(dt.Rows[0]["PAW2"].ToString());
PAW3 = int.Parse(dt.Rows[0]["PAW3"].ToString());
PAW4 = int.Parse(dt.Rows[0]["PAW4"].ToString());
PAW5 = int.Parse(dt.Rows[0]["PAW5"].ToString());
PLB1 = int.Parse(dt.Rows[0]["PLB1"].ToString());
PLB2 = int.Parse(dt.Rows[0]["PLB2"].ToString());
PLB3 = int.Parse(dt.Rows[0]["PLB3"].ToString());
PLB4 = int.Parse(dt.Rows[0]["PLB4"].ToString());
PLB5 = int.Parse(dt.Rows[0]["PLB5"].ToString());
TML1 = int.Parse(dt.Rows[0]["TML1"].ToString());
TML2 = int.Parse(dt.Rows[0]["TML2"].ToString());
TMT1 = int.Parse(dt.Rows[0]["TMT1"].ToString());
TMT2 = int.Parse(dt.Rows[0]["TMT2"].ToString());
param = MLT1 + ","
+ MLT2
+ ","
+ MLT3
+ ","
+ MLT4
+ ","
+ MLT5
+ ","
+ SNL1
+ ","
+ SNL2
+ ","
+ SNL3
+ ","
+ SNL4
+ ","
+ SNL5
+ ","
+ CAV1
+ ","
+ CAV2
+ ","
+ CAV3
+ ","
+ CAV4
+ ","
+ CAV5
+ ","
+ IBL1
+ ","
+ IBL2
+ ","
+ IBL3
+ ","
+ IBL4
+ ","
+ IBL5
+ ","
+ PAW1
+ ","
+ PAW2
+ ","
+ PAW3
+ ","
+ PAW4
+ ","
+ PAW5
+ ","
+ PLB1
+ ","
+ PLB2
+ ","
+ PLB3
+ ","
+ PLB4
+ ","
+ PLB5
+","
+ TML1
+ ","
+ TML2
+ ","
+ TMT1
+ ","
+ TMT2;
}
}
}
IHubContext context = GlobalHost.ConnectionManager.GetHubContext<WipHub>();
context.Clients.All.ReceiveWip(param);
}
private void dependency_OnChange( object sender, SqlNotificationEventArgs e )
{
if ( e.Type == SqlNotificationType.Change )
{
WipHub thisHub = new WipHub();
thisHub.SendWip();
}
}
}
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标签： javascript c# signalr