[英]Anonymous return in ASP.Net WebService
我創建了一個Web服務函數,該函數返回一個對象(匿名linq結果)
[WebMethod]
[ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
public object GetUser()
{
List<string> users = new List<string>
{
"Nora Aunor",
"Pilita Corrales"
};
var result = users.Select(u => new
{
Name = u,
Birthdate = DateTime.Now
})
.ToList();
var retVal = new
{
Data = result,
Count = result.Count
};
return retVal;
}
如果我使用Fiddler來獲取響應,它將返回ok,以及我期望的數據
但是如果我使用瀏覽器,它只會返回一個錯誤
System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: <>f__AnonymousType2`2[System.Collections.Generic.List`1[<>f__AnonymousType1`2[System.String,System.DateTime]],System.Int32] cannot be serialized because it does not have a parameterless constructor.
at System.Xml.Serialization.TypeDesc.CheckSupported()
at System.Xml.Serialization.TypeScope.GetTypeDesc(Type type, MemberInfo source, Boolean directReference, Boolean throwOnError)
at System.Xml.Serialization.XmlSerializationWriter.CreateUnknownTypeException(Type type)
at System.Xml.Serialization.XmlSerializationWriter.WriteTypedPrimitive(String name, String ns, Object o, Boolean xsiType)
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write1_Object(String n, String ns, Object o, Boolean isNullable, Boolean needType)
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write3_anyType(Object o)
at Microsoft.Xml.Serialization.GeneratedAssembly.ObjectSerializer1.Serialize(Object objectToSerialize, XmlSerializationWriter writer)
at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id)
--- End of inner exception stack trace ---
at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id)
at System.Xml.Serialization.XmlSerializer.Serialize(TextWriter textWriter, Object o, XmlSerializerNamespaces namespaces)
at System.Web.Services.Protocols.XmlReturnWriter.Write(HttpResponse response, Stream outputStream, Object returnValue)
at System.Web.Services.Protocols.HttpServerProtocol.WriteReturns(Object[] returnValues, Stream outputStream)
at System.Web.Services.Protocols.WebServiceHandler.WriteReturns(Object[] returnValues)
at System.Web.Services.Protocols.WebServiceHandler.Invoke()
問題:如何將匿名方法的結構+數據顯示為json,將在瀏覽器中顯示為這樣
{
"d": {
"Data": [{
"Name": "Nora Aunor",
"Birthdate": "\/Date(1393578983512)\/"
},
{
"Name": "Pilita Corrales",
"Birthdate": "\/Date(1393578983512)\/"
}],
"Count": 2
}
}
或默認的XML結果。
提前致謝
錯誤是Content-Type
標頭。 嘗試從Fiddler中將其從請求中刪除,您將看到相同的異常。 瀏覽器不會發送Content-Type: application/json
,並且您的Webserice嘗試返回XML序列化對象並失敗。 這通常是ASP.NET安全策略。 檢查此URL以獲取更多信息
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