如何在没有参数的情况下调用c＃方法并访问返回的数据？ [英] How to call c# method with no parameters and access returned data?
问题描述
所以我见过很多这样的例子：
https://stackoverflow.com/a/8094230/2525507
So I have seen many examples such as these : https://stackoverflow.com/a/8094230/2525507
public class WebService : System.Web.Services.WebService {
[WebMethod]
public List<string> getList() {
return new List<string> {"I", "Like", "Stack", "Overflow"};
}
}
你只是通过成功函数看来可以以警报的形式从c＃方法查看返回的数据。但是如果我想在函数调用之外访问这个input + 1数据怎么办呢，我该怎么做呢？另外我不知道如何调用没有参数的方法？
Where you just it seems that through the success function you can view the returned data from the c# method in the form of an alert. But what if I want to access this "input+1" data outside of the function call, how would I proceed to do that? Also I am not sure how to call a method that has no parameters?
<body>
<select id="wordSelect">
// Drop Down Menu to be populated
</select>
<script>
$(function () {
$.ajax({
url: 'WebService.asmx/getList',
data: '{**NO PARAMETERS?!**}', // should I also call JSON.stringify?
type: 'POST',
dataType: 'json',
contentType: 'application/json',
success: function (data, status) {
alert(data);
alert(typeof data);
}
});
});
$.each(data.i, function(index, item) { // will this access "I", "Like", ... etc?
$(#wordSelect).append(
$("<option></option>")
.text(item)
);
};
</script>
</body>
最后，我想使用已通过ajax调用的ac＃方法返回的JSON数据来填充下拉列表，但我不确定如何使用那些似乎停留在函数调用中的检索到的JSON数据？
In the end, I would like to populate a dropdown list using returned JSON data from a c# method that has been called through ajax, but I'm not sure how I can play with that retrieved JSON data that seems to be stuck in the function call?
对不起，我是Jquery / AJAX /等的新手...但是非常感谢你！
Sorry, I am new to Jquery/AJAX/etc... But Thank you so much!
推荐答案
如果你的方法不带参数，就不要在ajax调用上指定data属性
If your method takes no arguments, just don't specify the data property on the ajax call
<script>
$(function () {
$.ajax({
url: 'WebService.asmx/getList',
type: 'POST',
dataType: 'json', //make sure your service is actually returning json here
contentType: 'application/json',
success: function (data, status) {
//here data is whatever your WebService.asmx/getList returned
//populate your dropdown here with your $.each w/e
}
});
});
</script>
我也错了，但是你展示的WebService方法似乎不会返回JSON。我认为你必须序列化，或设置内容类型或类似的东西。 （自从我使用asmx类型服务以来一直沿着时间）
Also I could be wrong, but the WebService method you showed, doesn't look like it will return json. I think you will have to serialize, or set the content type or something similar. (Been along time since I've used the asmx type services)
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