如何从web服务方法返回多维数组

本文关键字：返回 数组 方法 服务 web | 更新日期: 2023-09-27 18:07:05

[WebMethod]
public  Object  GetAllItemsArray() 
{
        FoodCityData.ShoppingBuddyEntities fdContext = new FoodCityData.ShoppingBuddyEntities();
        IQueryable<Item> Query =
       from c in fdContext.Item
       select c;
        List<Item> AllfNames = Query.ToList();
        int arrayZise = AllfNames.Count;
        String[,] xx = new String[arrayZise,2];
        int i = 0;
        int j = 0;
        foreach(Item x in AllfNames)
        {
                xx[i,0] = x.ItemName.ToString();
                xx[i, 1] = x.ItemPrice.ToString();
                i++;
        }
         return (Object)xx;
    }

我想从这个web服务返回一个多维数组，我怎么做?

这个代码给出了一个错误

实际上这个web服务是从android应用程序调用的，这就是为什么我返回这个数据作为一个多维数组..

错误是:

System.InvalidOperationException: There was an error generating the XML document. ---> System.NotSupportedException: Cannot serialize object of type System.String[,]. Multidimensional arrays are not supported.
   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.Write5_anyType(Object o)
   at Microsoft.Xml.Serialization.GeneratedAssembly.ObjectSerializer.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.Xml.Serialization.XmlSerializer.Serialize(TextWriter textWriter, Object o)
   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()

如何从web服务方法返回多维数组

根据您之前的问题和您在答案下的注释中指定的错误，我认为您应该返回一个锯齿数组，如:

[WebMethod]
public  string[][]  GetAllItemsArray() 
{
        FoodCityData.ShoppingBuddyEntities fdContext = new FoodCityData.ShoppingBuddyEntities();
        IQueryable<Item> Query =
       from c in fdContext.Item
       select c;
        List<Item> AllfNames = Query.ToList();
        int arrayZise = AllfNames.Count;
        String[][] xx = new String[arrayZise][2]; //change here
        int i = 0;
        int j = 0;
        foreach(Item x in AllfNames)
        {
                xx[i][0] = x.ItemName.ToString();
                xx[i][1] = x.ItemPrice.ToString();
                i++;
        }
         return xx;
 }

您在问题异常中有答案- 不支持多维数组。在System.Xml.Serialization。你必须以不同的方式返回它-锯齿数组或编写自己的序列化器

我有同样的问题，一年后，但我寻找了几个解决方案，如果你想返回JSON或XML，那么你只需要调用序列化器。我创建了一个Dictionary对象并返回这个。它在网页中工作得很好，但不适用于web服务。经过一番寻找，我找到了这个Json Object序列化器。我只需要将我的对象传递给JsonConvert(SerializeObject)，然后JSON回来，web服务就可以工作了!这是一个了不起的软件包:http://james.newtonking.com/json。

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