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我正在使用 Extjs 4.1 和 asp.net 我正在尝试从数据库中填充网格面板，但出现错误。我正在使用网络服务来获取数据。

错误：

System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: Cannot serialize the DataTable. DataTable name is not set.
   at System.Data.DataTable.WriteXmlSchema(XmlWriter writer, Boolean writeHierarchy)
   at System.Data.DataTable.System.Xml.Serialization.IXmlSerializable.WriteXml(XmlWriter writer)
   at System.Xml.Serialization.XmlSerializationWriter.WriteSerializable(IXmlSerializable serializable, String name, String ns, Boolean isNullable, Boolean wrapped)
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write2_DataTable(Object o)
   at Microsoft.Xml.Serialization.GeneratedAssembly.DataTableSerializer.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()

我的网络服务代码

 [WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json,UseHttpGet = true, XmlSerializeString = false)]
    public DataTable displayData() {
        db obj = new db();
        return obj.getCountry();
    }

从 js 文件调用 web 服务

 var store = Ext.create('Ext.data.Store', {
            pageSize: 20,
            model: 'ForumThread',
            autoLoad: true,
            proxy: {
                type: 'ajax',
                url: 'report.asmx/displayData',
                dataType: "json",
                contentType: "application/json; charset=utf-8",
                 //url: '/grid.json',
                reader: {    
                root: 'data'   ,          
                    type: 'json',
                    method: "GET",
                    totalProperty: 'totalCount'
                }
            }
        });

即使我从网络服务中删除了这一行，[ScriptMethod(ResponseFormat = ResponseFormat.Json,UseHttpGet = true, XmlSerializeString = false)]但仍然是同样的错误。

我没有在我的代码中使用 XMLSerializer 然后它也会给我错误，比如生成 XML 文档时出错。

4

1 回答 1

2

如错误所示，您需要为数据表提供名称。

dt.TableName = "我的表";

于 2012-10-19T09:46:05.707 回答