使用XmlWriter創建XML時出現錯誤「<NodeName>」

Question

我正在處理一個應用程序，並將數據保存爲XML格式，但我遇到了格式正確的問題。

輸出看起來像使用此此

<GasInfoEntries> 
    <Gallons>123</Gallons> 
    <Price>456</Price> 
</GasInfoEntries><GasInfoEntries> 
    <Gallons>123</Gallons> 
    <Price>456</Price> 
</GasInfoEntries> 

IM把它寫

List<GasInfoEntries> data = new List<GasInfoEntries>(); 

         data.Add(new GasInfoEntries() { Gallons = TxtBoxGas.Text, Price = TxtBoxPrice.Text }); 
         xmlWriter.WriteStartDocument(); 
         xmlWriter.WriteStartElement("GasInfoEntries"); 

         xmlWriter.WriteStartElement("Gallons", ""); 
         xmlWriter.WriteString(TxtBoxGas.Text); 
         xmlWriter.WriteEndElement(); 


         xmlWriter.WriteStartElement("Price", ""); 
         xmlWriter.WriteString(TxtBoxPrice.Text); 
         xmlWriter.WriteEndElement(); 

         xmlWriter.WriteEndDocument(); 
         xmlWriter.Flush(); 
         //do i need? 
         xmlWriter.Close(); 

我得到這個錯誤

- $exception 
{System.InvalidOperationException: There is an error in XML document (1, 2). ---> System.InvalidOperationException: <GasInfoEntries xmlns=''> was not expected. 
    at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderList1.Read3_ArrayOfGasInfoEntries() 
    --- End of inner exception stack trace --- 
    at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, Object events) 
    at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream) 
    at LP_Buddy.MainPage.btnShow_Click(Object sender, RoutedEventArgs e)} 
System.Exception {System.InvalidOperationException} 

什麼想法？

謝謝

Answer 1

您缺少XML文檔中所需的根元素XML元素。只需像這樣添加它：

<GasRoot> 
    <GasInfoEntries> 
     <Gallons>123</Gallons> 
     <Price>456</Price> 
    </GasInfoEntries> 
    <GasInfoEntries> 
     <Gallons>123</Gallons> 
     <Price>456</Price> 
    </GasInfoEntries> 
</GasRoot>