ASHX file gets the data sent by the $.ajax () method _jquery

Today, using the Ajax method of jquery to send a request, found in the background using the Ashx file can not receive the parameters passed in the Ajax method, the Internet to find out the cause of the problem is found, I was in the $.ajax method indicated the "ContentType:" Application/json; Charset=utf8 ' ", so it is not possible to get the parameters passed to the server side when processing the request in the Ashx file.

The correct wording is as follows:

$.ajax ({
URL: '/handler.ashx?operflag=test ',
type: ' POST ',
* *
when requesting ashx file to remove ContentType, there is The data
format is {"Key", "value"}; Remember not to add double quotes outside the curly braces, which
will fail on the ASHX page without the data
* *
//contenttype: ' Application/json ; Charset=utf ',
data: {"
key": "XDP",
"key": "Aloof Pale Wolf" 
},
Cache:false,
dataType: ' Text ',
success:function (data) {
alert (data)
},
error:function (XHR) {
alert ("An error occurred, please try again later:" + Xhr.responsetext);
}

The following code can be used in the ashx file to get the parameters passed by the $.ajax method, as follows:

String key = Context. request["Key"];

Used to be the $.post method to deal with Ajax, so did not pay attention to this problem, and this time the project needs, so the use of $.ajax, did not expect to encounter the above problems, fortunately found the problem and solve the problem in time.

In addition, recently encountered a strange problem, "with Ajax submission of data to ashx, after the use of json.stringify format parameters on the server side of the value?" ", the code is as follows:

$.ajax ({
URL: '/handler.ashx?operflag=test ',
type: ' POST ',
//json.stringify format parameter
data: Json.stringify ({
"key": "Xdp-gacl",
"key": "White Tiger Emperor"
}),
contentType: ' Application/json; Charset=utf ' ,
Cache:false,
dataType: ' json ',
success:function (data) {
alert (Data.key + "|" + Data.key);
} ,
error:function (XHR) {
alert ("An error occurred, please try again later:" + Xhr.responsetext);
}

Results The context is used in ashx. The conventional way to request["Key3" is to get no arguments, as shown in the following illustration:

Depressed for a long time, how also want to do not understand why so, at first thought is more contenttype: ' Application/json; Charset=utf8 ' This code, and then comment out the code:

$.ajax ({
URL: '/handler.ashx?operflag=test ',
type: ' POST ',
//json.stringify format parameter
data: Json.stringify ({
"key": "Xdp-gacl",
"key": "White tiger God Emperor"
}),
//contenttype: ' Application/json; charset= UTF ',
cache:false,
dataType: ' json ',
success:function (data) {
alert (Data.key + "|" + Data.key); c13/>},
error:function (XHR) {
alert ("An error occurred, please try again later:" + Xhr.responsetext);
}

But the result is the same, using the context. request["Key3"] or get no parameters, no way, since the conventional way to get, then find his method, Baidu, found a solution, in the ASHX use the following way can be obtained, first write a general method of obtaining parameters, the code is as follows:

<summary>
///Get parameters
///</summary>
///<param name= "context" ></param>
// /<returns></returns>
private dictionary<string, object> GetParameter (HttpContext context)
{
StreamReader reader = new StreamReader (context. Request.inputstream);
Get JSON string: strjson={"key": "Xdp-gacl", "Key": "White Tiger Emperor"}
String Strjson = Httputility.urldecode (reader. ReadToEnd ());
JavaScriptSerializer JSS = new JavaScriptSerializer ();
Deserializes the JSON string into a Dictionary object
dictionary<string, object> dicparameter = JSS. Deserialize<dictionary<string, object>> (Strjson);
return dicparameter;

The GetParameter method returns a Dicparameter object that dicparameter the arguments submitted to the ashx from the $.ajax method, as shown in the following illustration:

This allows you to remove the passed parameters from the Dicparameter, with the complete code as follows:

public void ProcessRequest (HttpContext context)
{context
. Response.ContentType = "Text/plain";
String Operflag = context. request["Operflag"];
if (Operflag = = "Test")
{
string key = Context. request["Key"];
String key = Context. request["Key"];
String resstr = key + "|" + key;
Context. Response.Write (RESSTR);
}
else if (Operflag = = "Test")
{
dictionary<string, object> dicparameter = getparameter (context);
string key = dicparameter["Key"]. ToString ();
string key = dicparameter["Key"]. ToString ();
String resstr = "{\" key\ ": \" "+ key +" \ ", \" key\ ": \" "+ key +" \ "}";
Context. Response.Write (RESSTR);
}

The above is a small set to introduce the Ashx file to get $.ajax () method to send data, I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!