为什么Web服务返回的数据作为msg.d [英] Why does web service return data as msg.d
问题描述
我发现我的webmethod作为
返回数据 {D:
[
{ID:1,itemtxt:大师},
{ID:2,itemtxt:交易},
{ID:3,itemtxt:米施报告。}
]
}
如果您发现,该数组被命名为 D 。这是为什么 ?是有它的规则?
有关您的信息,我返回对象的列表(列表与LT;的webitem>
)
公共类的webitem
{
公众的webitem(字符串小子,串KVAL)
{
this.id =孩子;
this.itemtxt = KVAL;
} 公共字符串ID {搞定;组; }
公共字符串itemtxt {搞定;组; }
}
这是什么的 D 是什么意思?这将是永诺同为任何数据从我的webmethod派?或者它会根据我的数据类型/类类型的改变?
修改
下面是将WebMethod
[的WebMethod]
公开名单<&的webitem GT; GetSubModules(字符串键)
{
字符串s =由SMID秩序;
如果(关键!= NULL)
S =,其中的moduleId =+键+ S;
返回Utility.GetDDLVal(选择SMID ID,smname itemtxt从m_submodules+ S,NULL,NULL);
}
这是一个有点安全功能作为ASP.NET的一部分。它总是存在的,只要你不改变序列化。 大卫·沃德解释它是什么:
这是所有ASMX服务JSON通过ASP.NET AJAX扩展在ASP.NET 3.5序列化的情况。即使你只返回一个标量返回值,如字符串,int或布尔值,结果将始终是D括起来的。
块引用>和的原因是:
{D:1}
是不是有效的JavaScript语句,其中因为这样:
[1]
是
所以字符串作为脚本的D参数prevents直接执行的包装。任何对象或数组构造函数的后顾之忧。
块引用>I found that my webmethod is returning data as
{ "d": [ {"id":"1","itemtxt":"Masters"}, {"id":"2","itemtxt":"Transactions"}, {"id":"3","itemtxt":"Misch. Reports"} ] }
If you notice, the array is named as "d". Why is that ? is there any rule for it?
For your information I am returning a list of objects (
List<webitem>
)public class webitem { public webitem(string kid, string kval) { this.id = kid; this.itemtxt = kval; } public string id { get; set; } public string itemtxt { get; set; } }
What does this "d" mean ? will it allways be same for whatever data i send from my webmethod? or it is going to change depending on my data type/class type?
EDIT
Here is the webmethod
[WebMethod] public List<webitem> GetSubModules(string key) { string s = " order by smid"; if (key != null) s = " where moduleid=" + key + s; return Utility.GetDDLVal("Select smid id,smname itemtxt from m_submodules "+s, null, null); }
解决方案It's a bit of a security feature as part of ASP.NET. It will always be there as long as you don't change serializers. David Ward explains what it is:
This is the case with all ASMX services JSON serialized through the ASP.NET AJAX Extensions in ASP.NET 3.5. Even if you’re only returning a scalar return value, such as a string, int, or boolean, the result will always be enclosed within the "d".
And the why:
{"d": 1 }
Is not a valid JavaScript statement, where as this:
[1]
Is.
So the wrapping of the "d" parameter prevents direct execution of the string as script. No Object or Array constructor worries.
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