blocks|key|1030254|text|您可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1030255|HttpContext.Current.Session|code-block|syntax|javascript|1030256|但是，除非还指定了EnableSession=true，否则它将为null|offset|length|style|CODE|1030257|[System.Web.Services.WebMethod(EnableSession+=+true)]
public+static+String+checaItem(String+id)
{+
++++return+"zeta";
}|1030258|entityMap^0|0|0|9|I|X|4|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

You can use:

<pre><code>HttpContext.Current.Session
</code></pre>

But it will be <code>null</code> unless you also specify <code>EnableSession=true</code>:

<pre><code>[System.Web.Services.WebMethod(EnableSession = true)]
public static String checaItem(String id)
{ 
 return "zeta";
}
</code></pre>

blocks|key|1030319|text|有两种方法可以为Web方法启用会话：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1030320|1.+[WebMethod(enableSession:true)]

2.+[WebMethod(EnableSession+=+true)]|code-block|syntax|javascript|1030321|第一个带有构造函数参数enableSession:true的函数对我不起作用。具有EnableSession属性的第二个可以工作。|offset|length|style|CODE|1030322|entityMap^0|0|0|B|I|15|D|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

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

<pre><code>1. [WebMethod(enableSession:true)]

2. [WebMethod(EnableSession = true)]
</code></pre>

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

blocks|key|1030390|text|您可以像这样尝试这个新的公共静态无效MyMethod(string+ProductID，string+Price，string+Quantity，string+Total)//在这里添加新参数{+db_class+Connstring+=新db_class()；尝试{|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1030391|++++++++++++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;
++++++++}
++++}|code-block|syntax|javascript|1030392|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

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
 {

<pre><code> 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;
 }
 }
</code></pre>

blocks|key|1030441|text|如果启用了session，请查看您的web.config。这篇文章可能会给出更多的想法。https://stackoverflow.com/a/15711748/314373|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1030442|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/15711748/314373^0|18|17|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

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

blocks|key|1030486|text|对于启用会话，我们必须使用WebMethod(enableSession:true)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1030487|[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"]+%2B+","+%2B+name;
++++++++return+"Data+saved+successfully.";
++++}


}|code-block|syntax|javascript|1030488|现在，要使用session检索这些名称，我们可以这样做|1030489|[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;
++++++++}

++++}|1030490|因此，它将检索会话中的所有名称并显示。|1030491|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

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

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

 }

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


}
</code></pre>

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

<pre><code>[WebMethod(EnableSession = true)]
 public List&lt;string&gt; Display()
 {
 List&lt;string&gt; li1 = new List&lt;string&gt;();
 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;
 }

 }
</code></pre>

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

blocks|key|815674|text|在C#中，在使用web方法代码后台页面上，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|815675|[WebMethod(EnableSession+=+true)]
++++++++public+static+int+checkActiveSession()
++++++++{
++++++++++++if+(HttpContext.Current.Session["USERID"]+==+null)
++++++++++++{
++++++++++++++++return+0;
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++return+1;
++++++++++++}
++++++++}|code-block|syntax|javascript|815676|而且，在aspx页面中，|815677|$.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;
++++++++++++++++}
++++++++++++});|815678|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In C#, on code behind page using web method,
<pre><code>[WebMethod(EnableSession = true)]
 public static int checkActiveSession()
 {
 if (HttpContext.Current.Session[&quot;USERID&quot;] == null)
 {
 return 0;
 }
 else
 {
 return 1;
 }
 }
</code></pre>
And, in aspx page,
<pre><code>$.ajax({
 type: &quot;post&quot;,
 url: &quot;&quot;, // url here
 contentType: &quot;application/json; charset=utf-8&quot;,
 dataType: &quot;json&quot;,
 data: '{ }',
 crossDomain: true,
 async: false,
 success: function (data) {
 returnValue = data.d;
 if (returnValue == 1) {

 }
 else {
 alert(&quot;Your session has expired&quot;);
 window.location = &quot;../Default.aspx&quot;;
 }
 },
 error: function (request, status, error) {
 returnValue = 0;
 }
 });
</code></pre>

Can i use session values inside a <a href="http://msdn.microsoft.com/en-us/library/byxd99hx(v=vs.90).aspx"><code>WebMethod</code></a>?

I've tried using <code>System.Web.Services.WebMethod(EnableSession = true)</code> but i can't access Session parameter like <a href="http://msdn.microsoft.com/en-us/library/byxd99hx(v=vs.90).aspx#vbtskusingwebmethodattributeenablesession">in this example</a>:

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

here's the JS who calls the webmethod:

<pre><code> $.ajax({
 type: "POST",
 url: 'Catalogo.aspx/checaItem',
 data: "{ id : 'teste' }",
 contentType: 'application/json; charset=utf-8',
 success: function (data) {
 alert(data);
 }
 });
</code></pre>

How can I access session in a webmethod?

是否可以在WebMethod( )中使用会话值我尝试过使用System.Web.Services.WebMethod(EnableSession = true)，但无法像那样访问会话参数    [System.Web.Services.WebMethod(EnableSession = true)]    [Syste...

问如何在webmethod中访问会话？
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