如何使用jQuery调用C#Web服务以获得返回值 [英] How to use jQuery to make a call to c# webservice to get return value

问题描述

我想使用jQuery调用名为c.ashx的c#Web服务，该服务检查用户名是否有效，并以字符串形式返回错误消息.

I want to use jQuery to make a call to a c# web service called c.ashx which checks whether that username is valid and returns an error message as a string.

如果c#Web服务的返回值是字符串值，我应该输入什么数据和内容类型?

What should I put for data: and content type: if the return value of the c# webservice is a string value?

 jQuery.ajax({
 type: "GET",
 url: "/services/CheckUserName.ashx",
 data: "",
 contenttype: "",

 success: function (msg) {
     alert("success");

 },
 error: function (msg, text) {
     alert(text);
 }
 });

---

我创建了一个.asmx文件，但是jQuery并未调用它.以下正确吗?

---

I have created a .asmx file instead, but it doesn't get called by the jQuery. Is the following correct?

jQuery.validator.addMethod("UsernameCheck", function (value, element) {
    jQuery.ajax({
        type: "POST",
        url: "/services/CheckUsername.asmx?CheckUsername",
        data: '{ "context": "' + jQuery("#username").value + '"}',
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',

        success: function (msg) {
            alert("success");

        },
        error: function (msg, text) {
            alert(text);
        }
    });
});

推荐答案

数据应包含您在Web服务中调用的方法的参数.但是，ashx扩展适用于HTTP处理程序，在这种情况下，这不是一个很好的选择.应该改为使用Web服务.

Data should contain the parameters of the method you are calling in a web service. However, the ashx extension is for an HTTP Handler, which is not a good choice for this scenario. A web service should by used instead.

因此，如果您正在呼叫/services/LoginServices.asmx?CheckUserName，并且CheckUserName.asmx具有网络方法ValidateUser，例如

So if you were calling /services/LoginServices.asmx?CheckUserName, and CheckUserName.asmx had a webmethod ValidateUser such as

public string ValidateUser(string username)

然后jQuery的data属性为

then the data attribute for jQuery would be

data: '{ "username": "' + usernameValue + '"}'

您的contentType应该是application/json; charset=utf-8，dataType应该是"json".

请注意，您不会调用/services/CheckUserName.asmx，必须将Web服务中方法的名称附加到Web服务网址/services/LoginServices.asmx?CheckUserName.

Note that you're not going to call /services/CheckUserName.asmx, the name of the method in the web service has to be appended to the webservice url, /services/LoginServices.asmx?CheckUserName.

此外，您需要将type更改为"POST".

Also, you'll need to change your type to "POST".

这是一个完整的例子:

$.ajax({
type: 'POST',
url: 'LoginServices.asmx/CheckUserName',
data: '{"username": "' + usernameValue + '"}',
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: function(msg) {
    alert("Result: " + msg);
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
    alert("Error: " + textStatus);
}});

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