獲取錯誤（生成XML文檔時出錯）從asp.net中的extjs服務器端獲取數據

Question

我正在使用Extjs 4.1和asp.net 我試圖從數據庫中填充網格面板但出現錯誤。我正在使用webservice來獲取數據。

錯誤：

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web服務代碼

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

調用Web服務從js文件

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' 
       } 
      } 
     }); 

即使我從web服務[ScriptMethod(ResponseFormat = ResponseFormat.Json,UseHttpGet = true, XmlSerializeString = false)]但還是同樣的錯誤刪除此行。

我沒有在我的代碼中使用XMLSerializer，那麼它也會給我錯誤，例如生成XML文檔時發生錯誤。

Answer 1

您需要爲數據表提供一個名稱，如錯誤所示。

dt.TableName =「myTable」;