如何在 webmethod 中访问 session？

我可以在 WebMethod中使用会话值吗？

我试过使用 System.Web.Services.WebMethod(EnableSession = true)，但是我不能访问会话参数，比如 在这个例子中:

    [System.Web.Services.WebMethod(EnableSession = true)]
[System.Web.Script.Services.ScriptMethod()]
public static String checaItem(String id)
{
return "zeta";
}

这是调用 webmethod 的 JS:

    $.ajax({
type: "POST",
url: 'Catalogo.aspx/checaItem',
data: "{ id : 'teste' }",
contentType: 'application/json; charset=utf-8',
success: function (data) {
alert(data);
}
});
103407 次浏览
小开
最佳答案

You can use:

HttpContext.Current.Session

But it will be null unless you also specify EnableSession=true:

[System.Web.Services.WebMethod(EnableSession = true)]
public static String checaItem(String id)
{
return "zeta";
}
小开

There are two ways to enable session for a Web Method:

1. [WebMethod(enableSession:true)]


2. [WebMethod(EnableSession = true)]

The first one with constructor argument enableSession:true doesn't work for me. The second one with EnableSession property works.

小开

You can try like this [WebMethod] public static void MyMethod(string ProductID, string Price, string Quantity, string Total)// Add new parameter Here { db_class Connstring = new db_class(); try {

            DataTable dt = (DataTable)HttpContext.Current.Session["aaa"];


if (dt == null)
{
DataTable dtable = new DataTable();


dtable.Clear();
dtable.Columns.Add("ProductID");// Add new parameter Here
dtable.Columns.Add("Price");
dtable.Columns.Add("Quantity");
dtable.Columns.Add("Total");
object[] trow = { ProductID, Price, Quantity, Total };// Add new parameter Here
dtable.Rows.Add(trow);
HttpContext.Current.Session["aaa"] = dtable;
}
else
{
object[] trow = { ProductID, Price, Quantity, Total };// Add new parameter Here
dt.Rows.Add(trow);
HttpContext.Current.Session["aaa"] = dt;
}




}
catch (Exception)
{
throw;
}
}
小开

Take a look at you web.config if session is enabled. This post here might give more ideas. https://stackoverflow.com/a/15711748/314373

小开

For enable session we have to use [WebMethod(enableSession:true)]

[WebMethod(EnableSession=true)]
public string saveName(string name)
{
List<string> li;
if (Session["Name"] == null)
{
Session["Name"] = name;
return "Data saved successfully.";


}


else
{
Session["Name"] = Session["Name"] + "," + name;
return "Data saved successfully.";
}




}

Now to retrive these names using session we can go like this

[WebMethod(EnableSession = true)]
public List<string> Display()
{
List<string> li1 = new List<string>();
if (Session["Name"] == null)
{


li1.Add("No record to display");
return li1;
}


else
{
string[] names = Session["Name"].ToString().Split(',');
foreach(string s in names)
{
li1.Add(s);
}


return li1;
}


}

so it will retrive all the names from the session and show.

小开

In C#, on code behind page using web method,

[WebMethod(EnableSession = true)]
public static int checkActiveSession()
{
if (HttpContext.Current.Session["USERID"] == null)
{
return 0;
}
else
{
return 1;
}
}

And, in aspx page,

$.ajax({
type: "post",
url: "",  // url here
contentType: "application/json; charset=utf-8",
dataType: "json",
data: '{ }',
crossDomain: true,
async: false,
success: function (data) {
returnValue = data.d;
if (returnValue == 1) {


}
else {
alert("Your session has expired");
window.location = "../Default.aspx";
}
},
error: function (request, status, error) {
returnValue = 0;
}
});

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