[英]JSON, AJAX, and ASP.NET
我的客戶端文件在其jQuery中有一個ajax調用,該調用將JSON數據發送到服務器端WebMethod。 以下代碼有效:
服務器端的WebMethod(C#)
[System.Web.Services.WebMethod]
public static string GetCurrentTime(string[] name)
{
string str = "";
foreach(string s in name)
{
str += s;
}
return str;
}
和ajax調用(jQuery):
//array = ["a","b","c"]
//data = {'name':["a","b","c"]}
$.ajax({
type: "POST",
url: "schedule.aspx/GetCurrentTime",
data: "{'name':" + JSON.stringify(array) + "}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response){
alert(response.d);
},
complete: function () {
alert("complete");
}
});
tl; dr上面的代碼采用JSON字符串,並在服務器端方法中創建字符串數組。
如果將JSON更改為以下內容,將如何重寫上述WebMethod? “名稱”不再像上面的代碼中那樣是字符串數組,而是某些對象的數組,因此需要更改WebMethod中的參數類型,但是我不確定該怎么做。
{"name":[{"value":"val1"},{"value":"val2"}]}
這是我執行ajax請求時在Chrome的“網絡”標簽上收到的消息和stacktrace:
Message
:
"No parameterless constructor defined for type of 'System.String'."
StackTrace
:
" at System.Web.Script.Serialization.ObjectConverter.ConvertDictionaryToObject(IDictionary`2 dictionary, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject)
↵ at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject)
↵ at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject)
↵ at System.Web.Script.Serialization.ObjectConverter.AddItemToList(IList oldList, IList newList, Type elementType, JavaScriptSerializer serializer, Boolean throwOnError)
↵ at System.Web.Script.Serialization.ObjectConverter.ConvertListToObject(IList list, Type type, JavaScriptSerializer serializer, Boolean throwOnError, IList& convertedList)
↵ at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject)
↵ at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject)
↵ at System.Web.Script.Services.WebServiceMethodData.StrongTypeParameters(IDictionary`2 rawParams)
↵ at System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object target, IDictionary`2 parameters)
↵ at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary`2 rawParams)
↵ at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)"
如果您想將復雜的對象發送到您的網絡方法,例如。 {"value":"val1"}
那么您需要創建一個具有與JSON匹配的屬性的C#類,以便能夠接收數據。
因此,在您的情況下,您需要一個數據類,例如:
public class ValueObject
{
public string Value { get; set; }
}
然后,您需要更改您的網絡方法以接受ValueObject
數組:
[System.Web.Services.WebMethod]
public static string GetCurrentTime(ValueObject[] name)
{
string str = "";
foreach (var s in name)
{
str += s.Value;
}
return str;
}
請注意,屬性名稱Value
必須與JSON value
中的屬性名稱匹配
如果您想將{"name":[{"value":"val1"},{"value":"val2"}]}
值設置為Web方法,則創建一個數據模型,如下所示
public class Name
{
public string value { get; set; }
}
public class RootObject
{
public List<Name> name { get; set; }
}
並如下更改您的頁面方法簽名
[WebMethod]
[ScriptMethod]
public static string GetCurrentTime(RootObject list)
{
string str = "";
foreach (var s in list.name)
{
str += s.Value;
}
return str;
}
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