【发布时间】：2020-08-01 08:51:26
【问题描述】：
我需要读取 XML 并将其反序列化为 C# 中的对象。我使用 ToXmlFile(Object obj, string filePath) 函数的序列化部分创建了文件，如下所述。我在文件 test.xml 中创建了以下 XML：
<NYSE_Daily_Prices>
<stock_exchange>NYSE</stock_exchange>
<stock_symbol>ADI</stock_symbol>
<date>2000-01-03T00:00:00</date>
<stock_price_open>93.5</stock_price_open>
<stock_price_high>93.87</stock_price_high>
<stock_price_low>88</stock_price_low>
<stock_price_close>90.19</stock_price_close>
<stock_volume>3655600</stock_volume>
<stock_price_adj_close>39.97</stock_price_adj_close>
</NYSE_Daily_Prices>
<NYSE_Daily_Prices>
<stock_exchange>NYSE</stock_exchange>
<stock_symbol>ADI</stock_symbol>
<date>2000-01-04T00:00:00</date>
<stock_price_open>89.5</stock_price_open>
<stock_price_high>91.5</stock_price_high>
<stock_price_low>85.56</stock_price_low>
<stock_price_close>85.62</stock_price_close>
<stock_volume>2533200</stock_volume>
<stock_price_adj_close>37.95</stock_price_adj_close>
</NYSE_Daily_Prices>
<NYSE_Daily_Prices>
<stock_exchange>NYSE</stock_exchange>
<stock_symbol>ADI</stock_symbol>
<date>2000-01-05T00:00:00</date>
<stock_price_open>85.62</stock_price_open>
<stock_price_high>88.25</stock_price_high>
<stock_price_low>83.19</stock_price_low>
<stock_price_close>86.88</stock_price_close>
<stock_volume>3228000</stock_volume>
<stock_price_adj_close>38.51</stock_price_adj_close>
</NYSE_Daily_Prices>
这是我的对象：
public partial class NYSE_Daily_Prices
{
public string stock_exchange { get; set; }
public string stock_symbol { get; set; }
public System.DateTime date { get; set; }
public double stock_price_open { get; set; }
public double stock_price_high { get; set; }
public double stock_price_low { get; set; }
public double stock_price_close { get; set; }
public int stock_volume { get; set; }
public double stock_price_adj_close { get; set; }
}
这是序列化/反序列化的代码：
public static class XmlHelper
{
public static bool NewLineOnAttributes { get; set; }
/// <summary>
/// Serializes an object to an XML string, using the specified namespaces.
/// </summary>
public static string ToXml(object obj, XmlSerializerNamespaces ns)
{
Type T = obj.GetType();
var xs = new XmlSerializer(T);
var ws = new XmlWriterSettings { Indent = true, NewLineOnAttributes = NewLineOnAttributes, OmitXmlDeclaration = true };
var sb = new StringBuilder();
using (XmlWriter writer = XmlWriter.Create(sb, ws))
{
xs.Serialize(writer, obj, ns);
}
return sb.ToString();
}
/// <summary>
/// Serializes an object to an XML string.
/// </summary>
public static string ToXml(object obj)
{
var ns = new XmlSerializerNamespaces();
ns.Add("", "");
return ToXml(obj, ns);
}
/// <summary>
/// Deserializes an object from an XML string.
/// </summary>
public static T FromXml<T>(string xml)
{
XmlSerializer xs = new XmlSerializer(typeof(T));
using (StringReader sr = new StringReader(xml))
{
return (T)xs.Deserialize(sr);
}
}
/// <summary>
/// Deserializes an object from an XML string, using the specified type name.
/// </summary>
public static object FromXml(string xml, string typeName)
{
Type T = Type.GetType(typeName);
XmlSerializer xs = new XmlSerializer(T);
using (StringReader sr = new StringReader(xml))
{
return xs.Deserialize(sr);
}
}
/// <summary>
/// Serializes an object to an XML file.
/// </summary>
public static void ToXmlFile(Object obj, string filePath)
{
var xs = new XmlSerializer(obj.GetType());
var ns = new XmlSerializerNamespaces();
var ws = new XmlWriterSettings { Indent = true, NewLineOnAttributes = NewLineOnAttributes, OmitXmlDeclaration = true };
ns.Add("", "");
using (XmlWriter writer = XmlWriter.Create(filePath, ws))
{
xs.Serialize(writer, obj);
}
}
/// <summary>
/// Deserializes an object from an XML file.
/// </summary>
public static T FromXmlFile<T>(string filePath)
{
StreamReader sr = new StreamReader(filePath);
try
{
var result = FromXml<T>(sr.ReadToEnd());
return result;
}
catch (Exception e)
{
throw new Exception("There was an error attempting to read the file " + filePath + "\n\n" + e.InnerException.Message);
}
finally
{
sr.Close();
}
}
}
以及我用来请求反序列化的代码：
string filePath = $@"C:\Users\dmast\Documents\Upskilled\C#\C# Programming Project\MoneyBMineWpfApp\MoneyBMineWpfApp\OfflineFilesXML\{listRecentSearches.SelectedItem.ToString()}";
NYSE_Daily_Prices result = XMLReadWrite.XmlHelper.FromXmlFile<NYSE_Daily_Prices>(filePath);
我不断收到捕获的异常：
catch (Exception e)
{
throw new Exception("There was an error attempting to read the file " + filePath + "\n\n" + e.InnerException.Message);
}
任何帮助将不胜感激:)
【问题讨论】：
-
当抛出一个新的异常（顺便说一下，它不应该是基本异常类）时，只需将实际异常作为内部异常。现在，内部异常说明了什么？
-
throw的参数包括e.InnerException.Message，但您没有显示该 throw 的输出，也没有编写代码来显示e.Message。