Xml 挑战:你能用C#4.0让这个简单的函数更优雅吗
当我浏览我们的代码库时,我注意到了这个函数。它将Xml 挑战:你能用C#4.0让这个简单的函数更优雅吗,xml,c#-4.0,Xml,C# 4.0,当我浏览我们的代码库时,我注意到了这个函数。它将IDictionary(参数-实例变量)转换为XML字符串 这只是我的好奇心:-) 那么,使用C#4.0编写的代码可以少得多吗?规则:除了.Net Framework BCL之外,没有外部LIB。 为了让它更具挑战性,我不在这里介绍输入字典规范,因为您应该能够从代码中找到它 public string ConvertToXml() { XmlDocument doc = new XmlDocument(); doc.LoadXml(
IDictionary
(参数-实例变量)转换为XML字符串
这只是我的好奇心:-)
那么,使用C#4.0编写的代码可以少得多吗?规则:除了.Net Framework BCL之外,没有外部LIB。
为了让它更具挑战性,我不在这里介绍输入字典规范,因为您应该能够从代码中找到它
public string ConvertToXml() {
XmlDocument doc = new XmlDocument();
doc.LoadXml("<?xml version='1.0' encoding='utf-8'?><sc/>");
foreach (KeyValuePair<string, object> param in Parameters) {
XmlElement elm = doc.CreateElement("pr");
if (param.Value is int || param.Value is Int32 || param.Value is Int16 || param.Value is Int64) {
elm.SetAttribute("tp", "int");
} else if (param.Value is DateTime?){
elm.SetAttribute("tp", "datetime");
} else {
elm.SetAttribute("tp", "string");
}
elm.SetAttribute("nm", param.Key);
if (param.Value is DateTime?) {
DateTime? dateTime = param.Value as DateTime?;
elm.SetAttribute("vl", dateTime.Value.ToString("o"));
} else{
elm.SetAttribute("vl", param.Value.ToString());
}
doc.FirstChild.NextSibling.AppendChild(elm);
}
return doc.OuterXml;
}
公共字符串ConvertToXml(){
XmlDocument doc=新的XmlDocument();
doc.LoadXml(“”);
foreach(参数中的KeyValuePair参数){
XmlElement elm=doc.CreateElement(“pr”);
if(param.Value为int | | param.Value为Int32 | | param.Value为Int16 | | param.Value为Int64){
elm.SetAttribute(“tp”、“int”);
}else if(参数值是DateTime?){
elm.SetAttribute(“tp”、“日期时间”);
}否则{
elm.SetAttribute(“tp”、“字符串”);
}
elm.SetAttribute(“nm”,参数键);
如果(参数值是DateTime?){
DateTime?DateTime=参数值为DateTime?;
elm.SetAttribute(“vl”,dateTime.Value.ToString(“o”);
}否则{
SetAttribute(“vl”,param.Value.ToString());
}
文件FirstChild.NextSibling.AppendChild(elm);
}
返回doc.OuterXml;
}
让我补充一些想法
对我来说:
- 少即是多,但简练是不好的
- 更多的类型是好的,但琐碎的类型似乎很臭
- 可重用性很好
- 每个具体类型和XML生成逻辑本身的解耦转换细节
- 通过向提供程序添加新工厂,可以轻松引入新的数据类型支持。当前支持的类型集受枚举成员的限制,但显然可以轻松地切换到其他类型选择器/标识符
- 我必须同意jbtule的观点。Create()确实比构建的要好得多,以前从未使用过,很好的东西,谢谢李>
public string ConvertToXml(
IDictionary<string, object> rawData,
Dictionary<TypeCode, Func<object, Tuple<string, string>>> transformationFactoryProvider)
{
XmlDocument doc = new XmlDocument();
doc.LoadXml("<?xml version='1.0' encoding='utf-8'?><sc/>");
if (rawData != null)
{
Func<object, Tuple<string, string>> defaultFactory =
(raw) => Tuple.Create("string", raw.ToString());
foreach (KeyValuePair<string, object> item in rawData)
{
TypeCode parameterTypeCode = Type.GetTypeCode(item.Value.GetType());
var transformationFactory = transformationFactoryProvider.ContainsKey(parameterTypeCode)
? transformationFactoryProvider[parameterTypeCode]
: defaultFactory;
var transformedItem = transformationFactory(item.Value);
XmlElement xmlElement = doc.CreateElement("pr");
xmlElement.SetAttribute("tp", transformedItem.Item1);
xmlElement.SetAttribute("nm", item.Key);
xmlElement.SetAttribute("vl", transformedItem.Item2);
doc.FirstChild.NextSibling.AppendChild(xmlElement);
}
}
return doc.OuterXml;
}
// Transformation Factories
// Input: raw object
// Output: Item1: type name, Item2: value in the finally formatted string
Func<object, Tuple<string, string>> numericFactory = raw => Tuple.Create("int", raw.ToString());
Func<object, Tuple<string, string>> dateTimeFactory =
raw => Tuple.Create("datetime", (raw as DateTime?).GetValueOrDefault().ToString("o"));
// Transformation Factory Provider
// Input: TypeCode
// Output: transformation factory for the given type
var transformationFactoryProvider =
new Dictionary<TypeCode, Func<object, Tuple<string, string>>>
{
{TypeCode.Int16, numericFactory},
{TypeCode.Int32, numericFactory},
{TypeCode.Int64, numericFactory},
{TypeCode.DateTime, dateTimeFactory}
};
// Convert to XML given parameters
IDictionary<string, object> parameters = new Dictionary<string, object>
{
{ "SOMEDATA", 12 },
{ "INTXX", 23 },
{ "DTTM", DateTime.Now },
{ "PLAINTEXT", "Plain Text" },
{ "RAWOBJECT", new object() },
};
string xmlParameters = this.ConvertToXml(parameters, transformationFactoryProvider);
公共字符串convertXML(
索引原始数据,
字典转换FactoryProvider)
{
XmlDocument doc=新的XmlDocument();
doc.LoadXml(“”);
if(rawData!=null)
{
Func defaultFactory=
(raw)=>Tuple.Create(“string”,raw.ToString());
foreach(rawData中的KeyValuePair项)
{
TypeCode参数TypeCode=Type.GetTypeCode(item.Value.GetType());
var transformationFactory=transformationFactoryProvider.ContainsKey(参数类型代码)
?transformationFactoryProvider[参数类型代码]
:默认工厂;
var transformedItem=transformationFactory(项值);
xmlement xmlement=doc.CreateElement(“pr”);
SetAttribute(“tp”,transformedItem.Item1);
SetAttribute(“nm”,item.Key);
SetAttribute(“vl”,transformedItem.Item2);
doc.FirstChild.NextSibling.AppendChild(xmlElement);
}
}
返回doc.OuterXml;
}
如何使用示例:
public string ConvertToXml(
IDictionary<string, object> rawData,
Dictionary<TypeCode, Func<object, Tuple<string, string>>> transformationFactoryProvider)
{
XmlDocument doc = new XmlDocument();
doc.LoadXml("<?xml version='1.0' encoding='utf-8'?><sc/>");
if (rawData != null)
{
Func<object, Tuple<string, string>> defaultFactory =
(raw) => Tuple.Create("string", raw.ToString());
foreach (KeyValuePair<string, object> item in rawData)
{
TypeCode parameterTypeCode = Type.GetTypeCode(item.Value.GetType());
var transformationFactory = transformationFactoryProvider.ContainsKey(parameterTypeCode)
? transformationFactoryProvider[parameterTypeCode]
: defaultFactory;
var transformedItem = transformationFactory(item.Value);
XmlElement xmlElement = doc.CreateElement("pr");
xmlElement.SetAttribute("tp", transformedItem.Item1);
xmlElement.SetAttribute("nm", item.Key);
xmlElement.SetAttribute("vl", transformedItem.Item2);
doc.FirstChild.NextSibling.AppendChild(xmlElement);
}
}
return doc.OuterXml;
}
// Transformation Factories
// Input: raw object
// Output: Item1: type name, Item2: value in the finally formatted string
Func<object, Tuple<string, string>> numericFactory = raw => Tuple.Create("int", raw.ToString());
Func<object, Tuple<string, string>> dateTimeFactory =
raw => Tuple.Create("datetime", (raw as DateTime?).GetValueOrDefault().ToString("o"));
// Transformation Factory Provider
// Input: TypeCode
// Output: transformation factory for the given type
var transformationFactoryProvider =
new Dictionary<TypeCode, Func<object, Tuple<string, string>>>
{
{TypeCode.Int16, numericFactory},
{TypeCode.Int32, numericFactory},
{TypeCode.Int64, numericFactory},
{TypeCode.DateTime, dateTimeFactory}
};
// Convert to XML given parameters
IDictionary<string, object> parameters = new Dictionary<string, object>
{
{ "SOMEDATA", 12 },
{ "INTXX", 23 },
{ "DTTM", DateTime.Now },
{ "PLAINTEXT", "Plain Text" },
{ "RAWOBJECT", new object() },
};
string xmlParameters = this.ConvertToXml(parameters, transformationFactoryProvider);
//转换工厂
//输入:原始对象
//输出:Item1:类型名称,Item2:最终格式化字符串中的值
Func numericFactory=raw=>Tuple.Create(“int”,raw.ToString());
Func dateTimeFactory=
raw=>Tuple.Create(“datetime”,raw为datetime?).GetValueOrDefault().ToString(“o”);
//转换工厂提供者
//输入:类型代码
//输出:给定类型的转换工厂
var transformationFactoryProvider=
新词典
{
{TypeCode.Int16,numericFactory},
{TypeCode.Int32,numericFactory},
{TypeCode.Int64,numericFactory},
{TypeCode.DateTime,dateTimeFactory}
};
//将给定参数转换为XML
IDictionary参数=新字典
{
{“SOMEDATA”,12},
{“INTXX”,23},
{“DTTM”,DateTime.Now},
{“纯文本”,“纯文本”},
{“RAWOBJECT”,新对象()},
};
字符串xmlParameters=this.convertXML(参数,transformationFactoryProvider);
使用LINQ到XML可以使编写变得非常简单。如果您有选择的话,您更喜欢这个而不是标准的XML库
我认为这应该相当于:
public static string ToXmlString(this IDictionary<string, object> dict)
{
var doc = new XDocument(new XElement("sc", dict.Select(ToXElement)));
using (var writer = new Utf8StringWriter())
{
doc.Save(writer); // "hack" to force include the declaration
return writer.ToString();
}
}
class Utf8StringWriter : StringWriter
{
public override Encoding Encoding { get { return Encoding.UTF8; } }
}
static XElement ToXElement(KeyValuePair<string, object> kvp)
{
var value = kvp.Value ?? String.Empty;
string typeString;
string valueString;
switch (Type.GetTypeCode(value.GetType()))
{
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
typeString = "int";
valueString = value.ToString();
break;
case TypeCode.DateTime:
typeString = "datetime";
valueString = ((DateTime)value).ToString("o");
break;
default:
typeString = "string";
valueString = value.ToString();
break;
}
return new XElement("pr",
new XAttribute("tp", typeString),
new XAttribute("nm", kvp.Key),
new XAttribute("vl", valueString));
}
公共静态字符串ToXmlString(此IDictionary dict)
{
var doc=新的XDocument(新的XElement(“sc”,dict.Select(ToXElement));
使用(var writer=new Utf8StringWriter())
{
doc.Save(writer);/“hack”强制包含声明
返回writer.ToString();
}
}
类Utf8StringWriter:StringWriter
{
公共重写编码{get{return Encoding.UTF8;}}
}
静态元素(KeyValuePair kvp)
{
var value=kvp.value??String.Empty;
字符串类型字符串;
字符串值字符串;
开关(Type.GetTypeCode(value.GetType()))
{
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
typeString=“int”;
valueString=value.ToString();
打破
案例类型代码.DateTime:
typeString=“datetime”;
valueString=((日期时间)值).ToString(“o”);
打破
违约:
typeString=“string”;
valueString=value.ToString();
打破
}
返回新的XElement(“pr”,
新XAttribute(“tp”,类型字符串),
新XAttribute(“nm”,kvp.Key),
新的XAttribute(“vl”,valueString));
}
注意,检查
public string ConvertToXml()
{
var doc = new XDocument(
new XElement("sd",
Parameters.Select(param =>
new XElement("pr",
new XAttribute("tp", GetTypeName((dynamic)param.Value)),
new XAttribute("nm", param.Key),
new XAttribute("vl", GetValue((dynamic)param.Value))
)
)
)
);
return doc.ToString();
}
static string GetTypeName(long value)
{
return "int";
}
static string GetTypeName(DateTime? value)
{
return "datetime";
}
static string GetTypeName(object value)
{
return "string";
}
static string GetValue(DateTime? value)
{
return value.Value.ToString("o");
}
static string GetValue(object value)
{
return value.ToString();
}
public string ConvertToXml()
{
return new XElement("sc",
Parameters.Select(param => CreateElement(param.Key, (dynamic)param.Value))
).ToString(SaveOptions.DisableFormatting);
}
XElement CreateElement(string key, object value)
{
return CreateElement("string", key, value.ToString());
}
XElement CreateElement(string key, long value)
{
return CreateElement("int", key, value.ToString());
}
XElement CreateElement(string key, DateTime value)
{
return CreateElement("datetime", key, value.ToString("o"));
}
XElement CreateElement(string typename, string key, string value)
{
return new XElement("pr",
new XAttribute("tp", typename),
new XAttribute("nm", key),
new XAttribute("vl", value)
);
}